研究者詳細 - 安藤　義人

論文 - 安藤　義人

分割表示185 件中 1 - 20 件目／全件表示 >>

Novel one-step dilute acid-assisted hydrothermal delignification using dilute HNO<inf>3</inf> for facile high-purity cellulose extraction from oil palm fronds (OPF) 査読有り国際誌

Ibrahim I., Ahmad Farid M.A., Andou Y.

Biomass and Bioenergy 198 2025年07月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Oil palm fronds (OPF), available in abundance, represent a promising sustainable resource, yet its utilization is hindered by the demanding process of cellulose extraction. This study introduces a cost-effective, one-step dilute acid-assisted hydrothermal method using dilute HNO3 (0.5 M) at 120 °C. The selected conditions, with a treatment time of 30 min, resulted in cellulose extraction with a purity of 84.2 wt%, reducing lignin content from 21.8 to 9.3 wt% and hemicellulose from 31.6 to 6.4 wt%. A post-treatment alkaline rinse further increased cellulose purity to 96 wt% and crystallinity to 71.5 %. The method's applicability to other biomasses, including oil palm empty fruit bunch (OPEFB), bamboo, sisal, and shuro palm fibre, showed lignin reduction of up to 85 % and cellulose yields between 78 and 85 %. Thermal stability analysis via TGA indicated a decomposition temperature of 350 °C, and XRD analysis showed a crystallinity index increase from 45 to 62 %. This facile and sustainable process, using only HNO3 and water, marks a significant step forward in biomass valorization, providing environmental benefits by minimizing chemical use for industrial-scale lignocellulosic waste utilization.

DOI： 10.1016/j.biombioe.2025.107862

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Synthesis of Nanocellulose Derivatives through Esterification with Naphthoic Acid as a Fluorescent Additive 査読有り国際誌

Lease J., Sahin Z.M., A Farid M.A., Andou Y.

ACS Sustainable Chemistry and Engineering ( American Chemical Society (ACS) ) 12 ( 31 ) 11789 - 11796 2024年08月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The demand for sustainable and renewable resources has significantly increased in recent decades. Cellulose, as a potential and abundant resource in industry, offers promising prospects. As a biological polymer primarily originating from lignocellulosic biomass, cellulose is biodegradable and recyclable, making it an attractive candidate for mitigating environmental issues. In this research, microcrystalline cellulose (MCC) and cellulose nanofibers (CNFs) are modified using 1-naphthoic acid (1-NA) through an esterification reaction in a tosyl chloride/pyridine solvent system to produce fluorophore-labeled cellulose. Various characterization methods such as Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and X-ray diffraction (XRD) are used to investigate the success of the modification reaction. Cellulose modification results in a decrease in the thermal stability of cellulose by lowering the degradation temperature. The glass-transition temperature (Tg) is observed after inducing the naphthoate side chain, which is around 160 °C. The cellulose naphthoate exhibits strong ultraviolet (UV) absorption peaks at around 282 nm and presents good fluorescence properties. Herein, it can be used in fluorescence coatings, sensors, and also packaging.

DOI： 10.1021/acssuschemeng.4c04206

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Catalytic efficiency and stability of biomass-derived sulfonated graphene catalysts in microwave-enhanced biodiesel production 査読有り国際誌

Ahmad Farid M.A., Mohd Johari S.A., Lease J., Ayoub M., Andou Y.

Fuel 368 2024年07月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The strategic integration of bio-based catalytic design principles and the intricacies of microwave irradiation offers a viable path to improving the sustainability and efficiency of biodiesel production. In this work, we produced novel biomass-derived sulfonated graphene oxide (bGO-SO3H) and reduced graphene oxide (brGO-SO3H), examining their collaborative effects with microwave irradiation on reaction efficacy. Sulfonation in catalysts was evident through 1) reduced mass loss during thermal decomposition (bGO-SO3H: 34.5 %; brGO-SO3H: 29.4 %) compared to precursors (bGO: 55.6 %; brGO: 20.3 %), indicating decreased oxygen-containing functional groups; 2) higher TPD-acidic sites (bGO-SO3H: 3.17 mmol g−1; brGO-SO3H: 3.24 mmol g−1), supported by titration-acid density (bGO-SO3H: 2.97 mmol g−1; brGO-SO3H: 3.83 mmol g−1); and 3) additional C1s peaks attributed to C-S bonds in sulfonic moieties and a significant increase in sp2 carbon content compared to their precursors, confirmed by ID/IG ratio reduction (bGO-SO3H: 1.09 to 0.98, brGO-SO3H: 0.99 to 0.95). Despite modest surface areas (18–44 m2/g), both catalysts exhibited significantly elevated acid densities (0.05–4.83 mmol g−1) post-sulfonation. Under optimized conditions (2 wt% catalysts, 25:1 methanol-to-oil ratio, 25 min at 75 °C), bGO-SO3H yielded 90.97 % FAME yield, while brGO-SO3H achieved 97.45 % with a reduced dosage (1.5 wt%), shorter time (20 min), and less methanol (20:1). Despite catalytic deactivation, our study demonstrates reduced catalyst consumption, a lower reaction temperature, and a shortened conversion time compared to prior findings, thereby enhancing the efficiency of biodiesel production.

DOI： 10.1016/j.fuel.2024.131580

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Effect of solvent and acid catalyst selection on lignin recovery and purity in autoclave-assisted organosolv extraction 査読有り国際誌

Farid M.A.A., Ibrahim I., Lease J., Tsubota T., Andou Y.

Bioresource Technology Reports 24 2023年12月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study leverages the autoclave-assisted method to explore a range of acid catalysts (H2SO4, HCl, HNO3, H3PO4) and solvents (methanol, ethanol, acetone, 2-butanol, 2-propanol) for lignin extraction, with a focus on identifying optimal efficiency-enhancing combinations. By contrasting the performance of various acid catalysts and solvents, this work transcends previous efforts in this field. Notably, H2SO4 yields the highest lignin recovery (44.7 %) but with lower purity (78.4 %) compared to HCl (85.7 %) in the same solvent. Methanol yields the highest recovery (45.1 %), yet lower purity (79.2 %) than ethanol (85.7 %) with a similar catalyst. A pivotal improvement lies in the elucidation of structural purity, substantiated by IR and NMR resulting signals, supported by microscale morphology and chemical composition (SEM-EDX). This study extends current understanding, providing profound insights into optimizing extraction procedures for producing lignin with desired attributes.

DOI： 10.1016/j.biteb.2023.101622

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Effect of cellulose materials on the mechanochemical-assisted reaction system with oleic acid 査読有り国際誌

Lease J., Kawano T., Andou Y.

RSC Advances ( Royal Society of Chemistry (RSC) ) 13 ( 39 ) 27558 - 27567 2023年09月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

As the most abundant natural polymer in nature, cellulose has become the promising alternative raw material to replace fossil-based polymer. Owing to the presence of innumerable hydroxyl groups, various approaches are employed to render processability of cellulose. Herein, a sustainable esterification strategy, mechanochemical-assisted esterification, was developed to produce cellulose oleate (CO) with only a small amount of solvent. The differences in reactivity between all types of cellulose were elucidated. According to thermal stability analysis, the degradation temperature decreased after modification due to the substitution of the long oleoyl group. High degree of substitution (DS) of CO also possessed glass transition temperature (Tg) based on differential scanning calorimetry (DSC) analysis. Herewith, the processability of cellulose was introduced after modification. In this study, bamboo waste cellulose nanofiber oleate (BW CNF-OA) showed the highest DS (2.28) among the COs. Its higher surface reactivity due to the high surface aspect ratio led to a higher quantity of fatty acids attached to the cellulose. For the mechanical properties, low DS of COs exhibited higher tensile strength values. In a nutshell, this greener approach is more favorable than conventional chemical esterification in terms of reduced solvent dosage and improved sustainability.

DOI： 10.1039/d3ra04715f

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Synthesis and mechanical performance of thermoformable cellulose fatty acid esters using natural soap 査読有り国際誌

Kawano T., Andou Y.

RSC Advances ( Royal Society of Chemistry (RSC) ) 13 ( 35 ) 24286 - 24290 2023年09月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

A cellulose fatty acid ester consisting solely of natural organic compounds is synthesized by heterogeneous esterification. Solid soap, a natural product-based compound, is used as a mixed fatty acid source. The synthesized cellulose ester can be readily processed into a semi-transparent film. Mechanical properties of the cellulose ester are also investigated.

DOI： 10.1039/d3ra03833e

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Emulsion Polymerization of PMMA onto Natural Rubber 査読有り国際誌

Jacqueline Lease, Zeynep-Munteha Sahin, Yoshito Andou

ACS Applied Engineering Materials ( American Chemical Society (ACS) ) 1 2247 - 2254 2023年08月

Cu<inf>2</inf>O/TiO<inf>2</inf> decorated on cellulose nanofiber/reduced graphene hydrogel for enhanced photocatalytic activity and its antibacterial applications 査読有り国際誌

Zheng A.L.T., Sabidi S., Ohno T., Maeda T., Andou Y.

Chemosphere ( Elsevier BV ) 286 131731 2022年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Photocatalysis has gained attention as a viable wastewater remediation technique. However, the difficulty of recovering powder-based photocatalyst has often become a major limitation for their on-site practical application. Herein, we report on the successful in-situ preparation of a novel three-dimensional (3D) photocatalyst consisting of Cu2O/TiO2 loaded on a cellulose nanofiber (CNF)/reduced graphene hydrogel (rGH) via facile hydrothermal treatment and freeze-drying. The 3D macrostructure not only provides a template for the anchoring of Cu2O and TiO2 but also provides an efficient electron transport pathway for enhanced photocatalytic activity. The results showed that the Cu2O and TiO2 were uniformly loaded onto the aerogel framework resulting in the composites with large surface area with exposed actives sites. As compared to bare rGH, CNF/rGH, Cu2O/CNF/rGH and TiO2/CNF/rGH, the Cu2O/TiO2/CNF/rGH showed improved photocatalytic activity for methyl orange (MO) degradation. MO degradation pathway is proposed based on GC-MS analysis. The enhanced photoactivity can be attributed to the charge transfer and electron-hole separation from the synergistic effect of Cu2O/TiO2 anchored on CNF/rGH. In terms of their anti-bacterial activity towards Staphylococcus aureus and Escherichia coli, the synergistic effect of the Cu2O/TiO2 anchored on the CNF/rGH framework showed excellent activity towards the bacteria.

DOI： 10.1016/j.chemosphere.2021.131731

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Dual Role of Pennisetum purpureum as a Phytogenic Feed Additive: Enhancing Growth and Profitability in Antibiotic-Free Broiler Production 査読有り国際誌

Zheng A.L.T., Wong K.K.S., Ong Y.L., Lease J., Andou Y., Jesse F.F.A., Chung E.L.T.

Bioresources 20 ( 4 ) 8654 - 8673 2025年11月

掲載種別：研究論文（学術雑誌）

Amid growing concerns about antibiotic resistance in livestock systems, there is a global shift toward identifying plant-based alternatives to conventional synthetic feed additives. This study explored the physicochemical characteristics of raw Napier grass (Pennisetum purpureum) and assessed its viability as a low-cost, functional feed additive for colored broiler chicken diets. Comprehensive characterization was conducted on the raw grass, revealing structural features and functional groups characteristic of bioactive, fibrous biomass. A subsequent feeding trial was conducted with 216 Sasso broiler chicks divided among six dietary regimens: a negative control (basal diet), a positive control (100 mg/kg oxytetracycline), and four supplementation levels of P. purpureum grass meal (1.25 to 5.00 g/kg). The highest supplementation level (5.00 g/kg) significantly enhanced growth performance (p < 0.05), reducing feed conversion ratio (FCR) while maintaining low feed intake. Economic analyses demonstrated that this treatment yielded the greatest profitability, exhibiting superior net profit margin, break-even efficiency, and margin of safety. These findings indicated P. purpureum as a promising phytogenic feed additive with dual benefits of enhancing production efficiency and promoting sustainable poultry farming.

DOI： 10.15376/biores.20.4.8654-8673

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Additive manufacturing of high-performance adsorbents for environmental use 査読有り国際誌

Zheng A.L.T., Teo E.Y.L., Marzuki O.F., Koo L.F., Wong T.J., Chung E.L.T., Andou Y.

Engineering Research Express 7 ( 3 ) 2025年09月

担当区分：最終著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

The emergence of 3D printing (additive manufacturing) has revolutionized the fabrication of advanced adsorbents. This review provides a comprehensive, analytical assessment of 3D-printed adsorbents, critically evaluating their materials, fabrication methodologies, and performance metrics. The materials discussed include polymers, metal-organic frameworks (MOFs), zeolites, biopolymers, carbon-based materials, and hybrid composites, all of which are evaluated in terms of their adsorption efficiency, selectivity, and functionalization strategies. This review also highlights future research directions, including computational modeling-driven design, multi-material printing strategies, and sustainable material innovations. As additive manufacturing technologies progress, their integration with adsorption science presents significant potential to transform environmental and industrial purification systems.

DOI： 10.1088/2631-8695/adfacc

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Influence of surface passivation aiming towards enhancing the performance of organic phototransistor fabricated using oriented thin films of PFO-DBT 査読有り国際誌

Ramer S.G., Gaurav K.V., Palani I.A., Ando Y., Pandey S.S., Singh V.

Synthetic Metals 312 2025年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

Oriented and uniform thin films of solution-processable organic semiconducting copolymer PFO-DBT were fabricated using a recently developed unidirectional floating film transfer (FTM) method and used as an active semiconductor on surface passivated Si/SiO2 as gate dielectric to fabricate organic phototransistor (OPT) in the bottom gate top contact device architecture. The influence of different passivation of SiO2 such as an ultrathin spin-coated cyclic transparent optical polymer (CYTOP) and the self-assembled monolayer of hexamethyldisilazane (HMDS) on anisotropic charge transport and device performance of OPTs have been systematically investigated. FTM-processed thin films provided good optical anisotropy in thin films and electrical anisotropy in the OPTs. With improved surface properties and enhanced anisotropies, the device showed a charge carrier mobility of 7.8 × 10-3 cm2/V-sec, on/off ratio in the order of 105, and a threshold voltage of -4V under dark conditions. OPTs fabricated in this work demonstrated photosensitivity nearly of order 104 and a corresponding responsivity of 17 A/W under the illumination of 525 nm monochromatic green light with a low power density of 0.15 mW/cm2. The results are promising for making OPTs with enhanced mobility, photosensitivity and photo-responsivity in the visible region.

DOI： 10.1016/j.synthmet.2025.117869

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Temperature-dependent deoxygenation during sulfonation for graphene oxide reduction 査読有り国際誌

Ahmad Farid M.A., Lease J., Andou Y.

Applied Surface Science 691 2025年05月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The objective of this study was to elucidate the sulfonation behaviour of graphene oxide (GO) across a temperature range of 50 °C, 100 °C, and 150 °C under a nitrogen atmosphere. Analysis revealed a significant reduction in –OH, C-O, and O-C-O functional groups, facilitating a substantial conversion from sp3 to sp2 carbon hybridization. Specifically, the sp2 carbon content increased from 37.43 ± 2.0 % in GO to 50.32 ± 2.5 % in GO-SO3H50, 43.72 ± 3.0 % in GO-SO3H100, and 47.92 ± 2.8 % in GO-SO3H150. At higher temperatures, deoxygenation led to a decrease in C-S density due to the pronounced removal of oxygen moieties, which constrained the availability of functional groups for −SO3H binding. SEM imaging corroborated that sulfonated GO retained its disordered stacked layer configuration, consistent with the precursor. These results affirm that sulfonation is a viable alternative for synthesizing reduced graphene oxide (rGO), with enhanced sp2 carbon content and modified structural characteristics.

DOI： 10.1016/j.apsusc.2025.162678

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Rare earth elements for enhancing photocatalysis in pollutant degradation and water treatment 査読有り国際誌

Zheng A.L.T., Sinin A.E., Jin W.T., Feng K.L., Boonyuen S., Chung E.L.T., Lease J., Andou Y.

International Journal of Environmental Science and Technology 22 ( 8 ) 7247 - 7270 2025年04月

担当区分：最終著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

This review examines recent progress in using rare earth-based photocatalysts and their composites to degrade environmental pollutants. Rare earth elements (REEs), recognized for their unique electronic configurations and exceptional optical properties, have become effective dopants and co-catalysts, enhancing the capabilities of traditional semiconductor photocatalysts. Key enhancement strategies, including doping, co-doping, surface functionalization, and heterostructure formation, are analyzed to illustrate how they improve photocatalytic efficiency, stability, and selectivity. The review details studies on the photocatalytic degradation of various pollutants, such as dyes, antibiotics, and pesticides. It highlights how REEs contribute to better light absorption, efficient charge separation, and increased reactive oxygen species (ROS) production. The review also addresses challenges with the long-term stability of doped photocatalysts, like structural degradation and dopant leaching, suggesting possible solutions to enhance durability. By providing a broad overview, this review aims to guide researchers in designing next-generation photocatalysts for environmental remediation and to support the development of more sustainable water treatment technologies. Additionally, emerging trends such as green synthesis, integration with carbon-based nanocomposites, and scalable photocatalytic applications stressed REEs’ potential in advancing eco-friendly water treatment solutions, aligning with global sustainability objectives.

DOI： 10.1007/s13762-024-06203-5

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Bismuth vanadate modified glassy carbon electrode for sensitive electrochemical antibiotic detection 査読有り国際誌

Nedy T.U.A., Rahman M.A.b.A., Teo E.Y.L., Yiu P.H., Yiu E., Zheng A.L.T., Andou Y.

Journal of Nanoparticle Research 27 ( 4 ) 2025年04月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study presents the successful synthesis of bismuth vanadate (BiVO4) using a hydrothermal method and its application as a modifier on glassy carbon electrode (GCE). Fourier-transform infrared (FTIR) spectroscopy confirmed the presence of V–O stretching vibrations, while X-ray diffraction (XRD) analysis verified a pure monoclinic BiVO4 crystal structure. Morphological analysis revealed spherical BiVO4 particles, which contributed to enhanced electrochemical performance when integrated into the modified GCE. BiVO4/GCE exhibited superior electrochemical performance, as confirmed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) studies, in detecting analytes including hexacyanoferrate, tetracycline (TC), and levofloxacin (LVX). BiVO4 modification significantly boosted the performance of the electrode in terms of sensitivity, selectivity, and electron transfer kinetics. These enhancements can be attributed to BiVO4’s efficient electron transport and electrocatalytic activity. Notably, BiVO4/GCE exhibited the potential for simultaneous detection of multiple antibiotics showing its versatility for diverse electrochemical sensing applications. The limits of detection (LOD) and quantification (LOQ) for TC were 27.9 µM and 83.3 µM, respectively, while for LVX, they were 7.39 µM and 22.3 µM. Overall, these findings position BiVO4/GCE as a promising platform for advanced electrochemical detection and analysis across various fields.

DOI： 10.1007/s11051-025-06280-8

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Recent review on porous adsorbents for water decontamination: strategies for enhanced removal of tetracycline 査読有り国際誌

Zheng A.L.T., Teo E.Y.L., Seenivasagam S., Yiu P.H., Boonyuen S., Chung E.L.T., Andou Y.

Journal of Porous Materials 32 ( 1 ) 1 - 25 2025年02月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

The growing contamination of water sources by tetracycline (TC) antibiotics presents significant environmental and public health challenges. Porous adsorbents, including metal-organic frameworks (MOFs), graphene (Gr), biochar (BC), clay, zeolites, and porous polymers, have emerged as promising solutions due to their high surface area, tunable porosity, and modifiable chemistry. This review systematically explores recent advancements in the design and modification of these materials to enhance their efficiency in TC removal from water. Key strategies such as surface functionalization, composite formation, and doping are discussed, emphasizing their impact on TC adsorption capacity and performance. Additionally, the review addresses the practical challenges of implementing these modified adsorbents, including regeneration, cost-effectiveness, and environmental sustainability. Synergistic approaches combining multiple modification techniques are highlighted as pathways to next-generation adsorbents with superior performance. This work provides a comprehensive understanding of the state-of-the-art in porous adsorbent technology for antibiotic remediation, pointing towards innovative solutions for water decontamination and future directions in environmental pollution control.

DOI： 10.1007/s10934-024-01699-1

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Physicochemical Properties and Cost-Benefit of Supplementing Signal Grass (Brachiaria decumbens) in Sasso Broilers Production 査読有り国際誌

Seng K.W.K., Zheng A.L.T., Ong Y.L., Lease J., Andou Y., Jesse F.F.A., Dunshea F.R., Chung E.L.T.

BioResources 20 ( 2 ) 3176 - 3194 2025年01月

記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

There has been a growing interest in using natural alternatives to synthetic additives in animal feed. This study aimed to examine the physicochemical properties of signal grass (Brachiaria decumbens) and its cost-benefit application in broiler production. The characterization was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetry (TG/DTG), and scanning electron microscopy (SEM). A feeding trial involving 216 Sasso broiler chicks was conducted to assess the economic value of including B. decumbens grass meal in their diets. The chicks were divided into six groups, with Treatments 1 and 2 serving as controls (without antibiotics and with oxytetracycline, respectively). Treatments 3 to 6 received diets supplemented with 1.25, 2.50, 3.75, and 5.00 g/kg of B. decumbens grass meal without antibiotics. Body weight and feed intake were monitored over eight weeks to determine growth performance and feed conversion ratio. Broilers in Treatment 6, which received 5.00 g/kg of the grass meal, showed significantly improved growth (p < 0.05). A cost-benefit analysis revealed that T6 was the most profitable, suggesting B. decumbens' potential as an effective feed additive for broilers.

DOI： 10.15376/biores.20.2.3176-3194

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Biochar-based electrochemical sensors: a tailored approach to environmental monitoring 査読有り国際誌

Zheng A.L.T., Lih E.T.Y., Hung Y.P., Boonyuen S., Al Edrus S.S.A.O., Chung E.L.T., Andou Y.

Analytical Sciences 41 ( 6 ) 715 - 735 2025年01月

担当区分：最終著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

Biochar (BC), often obtained via thermochemical conversion methods of biomass, has emerged as a versatile material with significant potential in electrochemical sensing applications. This review critically examines the recent advancements in the development of BC-based sensors for the electrochemical determination of pharmaceuticals, pesticides, heavy metals, phenolic compounds, and microplastics. BC-based electrochemical sensors have emerged as a promising alternative due to their sustainability, cost-effectiveness, and excellent electrochemical properties. The unique physicochemical properties of BC, including its high surface area, porosity, and functional groups, contribute to its effectiveness as a sensor material. The review begins with an overview of the synthesis methods for BC, highlighting the activation strategies on its structural and electrochemical properties. Next, the functionalization of BC and its integration into electrochemical sensor platforms are explored. The performance of BC-based sensors is evaluated using electrochemical focusing on their sensitivity, selectivity, detection limits, and stability. Future directions for research are proposed, emphasizing the need for further optimization, miniaturization, and integration of BC-based sensors into portable and on-site analytical devices.

DOI： 10.1007/s44211-025-00726-8

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Design of Stimuli-responsive Surface for Reversible Wettability Switching by Vapor-Phase Assisted Photo-polymerization 査読有り国際誌

Andou Y., Ruozhu W.

Pertanika Journal of Science and Technology 33 ( S2 ) 1 - 11 2025年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

In exploring the development of stimuli-responsive surfaces capable of reversible wettability switching, our study delved into the efficacy of vapor-phase-assisted surface photo-polymerization (photo-VASP). This innovative approach modulated Si-wafer and cotton surfaces’ chemical and physical attributes. The method involved strategically using a blend of hydrophobic and hydrophilic vinyl monomers, enabling fine-tuning surface properties. By carefully selecting monomer combinations, we achieved seamless copolymerization, effectively grafting the polymers onto the surfaces. The efficacy of this grafting process was validated through contact angle measurements post-solvent extraction of unattached polymers. Crucially, the surfaces engineered through this process demonstrated a remarkable capacity for reversible wettability switching, a feature dynamically controlled by the application and removal of external stimuli. This capability underscores the potential of our approach in creating advanced functional surfaces with tunable properties.

DOI： 10.47836/pjst.33.S2.01

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Biodiesel production from waste cooking oil in presence of modified waste eggshell catalyst via microwave heating 査読有り国際誌

Johari S.A.M., Chandrasehgaran N., Ayoub M., Ho C.Y., Ando Y.

Materials Research Proceedings 53 117 - 124 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This study compares the efficiency of producing biodiesel from waste cooking oil (WCO) utilizing modified eggshell based calcium oxide (CaO) catalysts improved with magnesium-aluminum hydrotalcite to pure eggshell based CaO by microwave-heated transesterification. The study optimized process parameters for a methanol to oil molar ratio of 9:1 at 65°C for 30 minutes, with the goal of enhancing catalyst stability and basicity for effective biodiesel synthesis. The study demonstrated that the eggshell based CaO/Mg-Al catalyst was better in biodiesel yield (89.44%) than the pure eggshell based CaO and exhibited improved stability and catalytic activity through gas chromatography with mass spectrometry (GC-MS) analysis for fatty acid methyl ester (FAME) composition and biodiesel yield.

DOI： 10.21741/9781644903575-11

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105005290973&origin=inward

Assessing the Photocatalytic Performance of Hydrothermally Synthesized Fe-Doped BiVO4 Under Low-Intensity UV Irradiation 査読有り国際誌

Maran M.A., Zheng A.L.T., Tan H.Y., Sarbini S.R., Tan K.B., Boonyuen S., Wong K.K.S., Chung E.L.T., Lease J., Andou Y.

Arabian Journal for Science and Engineering 2025年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study demonstrates the potential of Fe-doped BiVO<inf>4</inf> as an efficient photocatalyst for the degradation of tetracycline (TC). The Fe-doped BiVO<inf>4</inf> was synthesized using the hydrothermal method, resulting in a monoclinic heterostructure with a crystallite size ranging from 27.37 to 29.10 nm and an optical band gap of 2.69–2.87 eV. Photocatalytic tests revealed that 3 wt% Fe doping exhibited the highest degradation efficiency, removing 73.37% of TC in 120 min under a low-power (13 W) UV lamp. The enhanced photocatalytic performance was attributed to the improved electron–hole separation and optimized Fe doping concentration, which facilitated more efficient light absorption and charge carrier dynamics. Additionally, antibacterial tests confirmed the catalyst’s ability to inactivate Staphylococcus aureus, even in the absence of light, demonstrating its dual functionality in both pollutant degradation and bacterial inactivation. The cost analysis revealed that the synthesized Fe-doped BiVO<inf>4</inf> costs RM 8.17 per gram, further enhancing its appeal for scalable and cost-effective applications. These findings highlight the versatility of Fe-doped BiVO<inf>4</inf> as a photocatalyst for addressing antibiotic-based pollution and waterborne pathogens, making it a promising candidate for practical applications in wastewater treatment and environmental remediation. These findings contribute to global efforts in mitigating waterborne antibiotic and microbial pollution, particularly in regions where access to high-energy treatment technologies is limited.

DOI： 10.1007/s13369-025-10278-8

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105007073784&origin=inward

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