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Research Progress of Magnetic Nanomaterials and Magnetic Field based Chemiresistive Gas Sensors
Authors: Jiangnan Chang, Yixun Gao, Zhipeng Hou and Yao WangAvailable online: 23 December 2024More LessWith the increasing demand for environmental protection and safety monitoring, the development of gas sensors with high sensitivity, fast response and selectivity is imperative. Magnetic field-assisted gas sensing is gradually becoming a research hotspot. This review aims to provide an overview of magnetic-related chemiresistive gas sensing from two segments, including magnetic sensing materials and magnetic field-assisted gas sensing. The type of sensors, the classification and parameters of magnetic materials, and the various materials employed in gas sensing are summarized. The review presents the currently commonly used methods for influencing magnetic structure and properties: chemical doping, defect engineering, and heterostructure construction et al., as well as the application of applied magnetic field in gas sensing. This paper provides the first overview of chemiresistive gas sensors from a magnetic point of view, which is crucial for the development of magnetically correlated gas sensing technology and the subsequent study of the intrinsic mechanisms.
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Caffeine-modified Magnetic Activated Carbon as Novel Bio Adsorbent for Removal of the Diazinon Pesticide in Aqueous Media
Authors: Behjat Pouramiri and Vajihe NejadshafieeAvailable online: 02 December 2024More LessIntroductionIn this study, a novel composite was prepared using a combination of nanotechnology and biotechnology.
MethodThis composite involved loading Fe3O4 NPs and immobilizing caffeine on the surface of activated carbon (CAF-MAC NCs), which was prepared from palm kernel source material. The adsorbent properties were characterized using FTIR, TEM, VSM, and TGA techniques.
ResultThe adsorbent CAF-MAC NCs were investigated under ultrasound-assisted conditions for the removal of the pesticide diazinon from aqueous solutions. The Langmuir adsorption isotherm model indicated that the maximum adsorption of diazinon was 147.05 mg g-1.
ConclusionThe new bio-adsorbent offers several significant advantages, including high adsorption capacity, cost-effectiveness, green synthesis, recyclability, and easy separation.
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Enhancing Photocatalytic Hydrogen Production Efficiency with Carbon Fibers: A Mini Review
Authors: Wenyan Zhang, Xiaoxia Lin, Hangmin Guan, Yihan Wang, Weidong Tao, Wenjie Tian and Lingyun HaoAvailable online: 23 October 2024More LessPhotocatalytic hydrogen evolution represents a promising route for sustainable and clean energy production. Integrating carbon fiber with various photocatalysts has shown significant enhancements in photocatalytic efficiency. This enhancement is primarily due to carbon fibers’ high conductivity, large surface area, and exceptional mechanical stability, which collectively promote electron transfer, charge separation, light absorption, active site enrichment, and improve catalysts’ robustness and resistance to environmental variation. Despite its potential, the use of carbon fiber in this field has been less explored compared to other conductive supports. Aiming to provide insights for future studies, this paper reviews the current advancements in integrating carbon fibers within photocatalytic systems, exploring the underlying mechanisms and future perspectives to boost hydrogen evolution efficiency and sustainability further.
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