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首页> 外文期刊>RSC Advances >An efficient and robust exfoliated bentonite/Ag3PO4/AgBr plasmonic photocatalyst for degradation of parabens
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An efficient and robust exfoliated bentonite/Ag3PO4/AgBr plasmonic photocatalyst for degradation of parabens

机译：一种高效且坚固的剥落的膨润土/ Ag3PO4 / Agbr等离子体光催化剂，用于降解羟基苯甲酸酯

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摘要

Efficient visible-light-driven heterojunction photocatalysts have attracted broad interest owing to their promising adsorption and degradation performances in the removal of organic pollutants. In this study, a mesoporous exfoliated bentonite (EB)/Ag3PO4/AgBr (30%) photocatalyst was obtained by stripping and exfoliating bentonite as the support for loading Ag3PO4 and AgBr. The particle size ranges of Ag3PO4 and AgBr were about 10-30 nm and 5-10 nm, respectively. The exfoliated bentonite could greatly improve the dispersion and adsorption of Ag3PO4 and AgBr, and significantly enhance the stability of the material during paraben photodegradation. 0.2 g L-1 methylparaben (MPB) was completely decomposed over the EB/Ag3PO4/AgBr (30%) in 40 min under visible light irradiation. In addition, the photocatalytic activity of EB/Ag3PO4/AgBr (30%) remained at about 91% after five recycling runs manifesting that EB/Ag3PO4/AgBr (30%) possessed excellent stability. Radical quenching tests revealed that holes (h(+)) and hydroxyl radicals (center dot OH) were the major radicals. They attacked the side chain on the benzene ring of parabens, which were gradually oxidized to the intermediates, such as benzoic acid, 3-hydroxybenzoic acid, 4-hydroxybenzoic acid, azelaic acid, and eventually became CO2 and H2O. The enhancement of photocatalytic activity and photo-stability could be ascribed to the stable structural characteristics, enlarged surface area, high absorption ability, and improved light absorption ability from loading Ag3PO4 onto EB. Meanwhile, the matched energy levels of Ag3PO4 and AgBr made the photoelectron-hole pairs separate and transfer effectively at the interfaces. As a result, the photocatalytic properties of EB/Ag3PO4/AgBr (30%) composites were enhanced.
机译：由于在去除有机污染物中，由于其有希望的吸附和降解性能，有效的可见光驱动的异质结光催化剂引起了广泛的兴趣。在该研究中，通过剥离和剥离膨润土作为负载均Ag3PO4和AgBR的载体获得介孔剥离膨润土（EB）/ Ag3PO4 / Agbr（30％）光催化剂。 Ag3PO4和AgBR的粒度范围分别为约10-30nm和5-10nm。剥落的膨润土可以大大改善Ag3PO4和AgBR的分散和吸附，并显着提高了羟基苯甲醚光降解期间材料的稳定性。在可见光照射下40分钟内将0.2g L-1甲基羟基（MPB）在40分钟内完全分解在40分钟内。此外，经过五次再循环运行后，EB / Ag3Po4 / Agbr（30％）的光催化活性仍保持在91％，展现EB / AG3PO4 / AGBR（30％）具有优异的稳定性。根本淬火试验显示孔（H（+））和羟基自由基（中心点OH）是主要的基团。它们袭击了羟基苯甲酸苯环上的侧链，其逐渐氧化成中间体，例如苯甲酸，3-羟基苯甲酸，4-羟基苯甲酸，壬二酸，最终成为CO2和H2O。光催化活性和光稳定性的增强可以归因于稳定的结构特征，扩大表面积，高吸收能力，以及将Ag3PO4加载到EB上的改善的光吸收能力。同时，AG3PO4和AGBR的匹配能级使光电子孔对在接口处有效地分离和转移。结果，增强了EB / Ag3PO4 / AgBr（30％）复合材料的光催化性质。

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  • 来源
    《RSC Advances》 |2020年第27期|共11页
  • 作者

    Ma Jianchao; Yang Shurong; Shi Huixian; Pang Jin; Zhang Xiaopeng; Wang Yuxing; Sun Hongqi;

  • 作者单位

    Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Inst New Carbon Mat Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    Edith Cowan Univ Sch Engn Joondalup WA 6027 Australia;

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  • 中图分类 化学;
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