A gourd-like hollow mesoporous silica particle supported Ag/AgBr Schottky junction for high-efficient mineralization of tetracycline hydrochloride
A gourd-like hollow mesoporous silica particle supported Ag/AgBr Schottky junction for high-efficient mineralization of tetracycline hydrochloride
复制标题
葫芦状中空介孔二氧化硅颗粒负载Ag/AgBr肖特基结用于盐酸四环素的高效矿化
DOI：
10.1039/d0en00746c
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Chuan-yi Wang
中科院分区：
文献类型：
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作者：
Wei Li;Xiao-shan Chu;Shu-ao He;Xue-chuan Wang;Chuan-yi Wang
盐酸四环素（TTC）是一种典型的具有生物毒性的抗生素，对生态系统危害很大。光催化被认为是解决这一问题的有效方法。然而，传统的光催化剂存在光响应受限、电荷输运差、吸附能力低等缺点，极大地限制了其应用。本文构建了葫芦状中空介孔二氧化硅（HS）颗粒，具有相当大的BET表面积（1181.57 m2 g−1）和增强的光吸收，以支持Ag/AgBr Schottky结。电化学表征证实，由于Ag/AgBr肖特基结和氨基修饰的葫芦状HS颗粒的协同作用促进了˙OH自由基的有效生成，制备的光催化剂的光学响应和电荷转移显著提高。最佳HS-Ag/AgBr （40 wt% HSAA）由于与O2˙−/˙OH自由基发生氧化还原反应，表现出最高的TTC降解活性（3.79 × 10−2 min−1），比商用P25 （1.34 × 10−3 min−1）高28.3倍，比AgBr （2.96 × 10−3 min−1）高12.8倍。最重要的是，在90 min/150 min的光照条件下，40 wt% HSAA的矿化率约为72.04%/81.17%，高于文献报道的P25和其他Ag/ agbr基光催化剂的矿化率。因此，该结构可完全分解TTC及其副产物，为有效处理生态系统中的抗生素污染提供了一种有前景的途径。
Tetracycline hydrochloride (TTC), a typical antibiotic with biological toxicity, is very harmful to the ecosystem. Photocatalysis is considered an effective method for solving this problem. However, traditional photocatalysts have limited light response, poor charge transport, and low adsorption ability, which substantially limit their application. Herein, gourd-like hollow mesoporous silica (HS) particles with considerable BET surface area (1181.57 m2 g−1) and enhanced light absorption were constructed to support the Ag/AgBr Schottky junction. Photoelectrochemical characterizations confirmed that the optical response and charge transfer of the fabricated photocatalysts were significantly elevated because the synergistic effect of the Ag/AgBr Schottky junction and amino-modified gourd-like HS particles facilitated the effective generation of ˙OH radicals. The optimal HS-Ag/AgBr (40 wt% HSAA) exhibited highest TTC degradation activity (3.79 × 10−2 min−1) owing to a redox reaction with O2˙−/˙OH radicals, which was about 28.3-fold greater than the commercial P25 (1.34 × 10−3 min−1) and 12.8-fold greater than the AgBr (2.96 × 10−3 min−1). Most importantly, about 72.04%/81.17% of TTC was mineralized by optimal 40 wt% HSAA after 90 min/150 min of illumination, which was higher than those with P25 and other Ag/AgBr-based photocatalysts reported in the literature. Therefore, TTC and its by-products could be completely decomposed by this novel structure, and this study provides a prospective approach for the effective handling of antibiotic pollution in the ecosystem.