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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Fabrication, characterization and mechanism of a novel Z-scheme Ag3PO4/NG/polyimide composite photocatalyst for microcystin-LR degradation
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Fabrication, characterization and mechanism of a novel Z-scheme Ag3PO4/NG/polyimide composite photocatalyst for microcystin-LR degradation

机译：新型Z-Sceptine Ag3PO4 / Ng /聚酰亚胺复合光催化剂的制备，表征和机理用于微胱氨酸-LR降解

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摘要

In recent years, the frequent eutrophication of water bodies around the world has led to the accumulation of microcystins (MC-LR) in water bodies, causing great harm to humans and aquatic organisms. In this study, a Z-scheme Ag3PO4/NG/PI composite photocatalyst was fabricated by using silver orthophosphate, nitrogen-doped graphene and polyimide for photocatalytic degradation of MC-LR under visible light irradiation. The structure, morphology and optical properties of Ag3PO4/NG/PI were characterized by XRD, SEM, TEM, XPS, FT-IR, BET, and UV-vis DRS. The degradation ratio of MC-LR by Ag3PO4/NG/PI photocatalysts was higher (up to 94.4%) than that of pure Ag3PO4 for MC-LR degradation within 10 h under visible light irradiation, and the kinetic constant over Ag3PO4/NG/PI was similar to 7 times of pure Ag3PO4. Based on the results of Liquid Chromatography-Mass Spectrometry (LC-MS), the possible degradation pathways of MC-LR were proposed. Photoelectrochemistry measurement (the photocurrent response, electrochemical impedance spectroscopy and Mott-Schottky plots), radical trapping experiment, electron spin resonance test, PL spectroscopy and analysis of band gap have revealed that the photocatalysis of Ag3PO4/NG/PI follows the Z-scheme mechanism, which can not only promote the separation and migration of photogenerated carriers to reduce re-combination, but also maintain a strong redox capacity. Meanwhile, the stability of Ag3PO4/NG/PI photocatalyst is greatly improved because the photogenerated electrons (e(-)) of Ag3PO4 are migrated to NG to suppress the photo-corrosion of Ag3PO4.
机译：近年来，世界各地的水体常见的富营养化导致水体中微囊藻（MC-LR）积聚，对人类和水生生物造成巨大危害。在该研究中，通过使用银正磷酸银，氮气掺杂的石墨烯和聚酰亚胺来制造Z-SchemeAd，Z-Schape Ag3PO4 / Ng / PI复合光催化剂，用于在可见光照射下MC-LR的光催化降解。 Ag3PO4 / NG / PI的结构，形态和光学性质的特征是XRD，SEM，TEM，XPS，FT-IR，BET和UV-VIS DRS。通过Ag3PO4 / Ng / Pi光催化剂的MC-LR的降解比率高于10小时内MC-LR降解的纯Ag3PO4的降解比率，并且在Ag3PO4 / Ng / Pi上的动力量常数类似于纯ag3po4的7次。基于液相色谱 - 质谱（LC-MS）的结果，提出了MC-LR的可能降解途径。光电化学测量（光电流响应，电化学阻抗谱和Mott-Schottky图），自由基捕获实验，电子自旋共振试验，PL光谱和带隙分析表明，Ag3PO4 / Ng / PI的光催化遵循Z方案机制，这不仅可以促进光生载体的分离和迁移，以减少重新组合，而且还保持强氧化还原能力。同时，Ag3PO4 / Ng / Pi光催化剂的稳定性大大提高，因为Ag3PO4的光发生电子（E（ - ））迁移至Ng以抑制Ag3PO4的光腐蚀。

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