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A gourd-like hollow mesoporous silica particle-supported Ag/AgBr Schottky junction for highly efficient mineralization of tetracycline hydrochloride
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0en00746c Wei Li 1, 2, 3, 4, 5 , Xiao-shan Chu 1, 2, 3, 4, 5 , Shu-ao He 1, 2, 3, 4, 5 , Xue-chuan Wang 1, 2, 3, 4, 5 , Chuan-yi Wang 5, 6, 7, 8
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0en00746c Wei Li 1, 2, 3, 4, 5 , Xiao-shan Chu 1, 2, 3, 4, 5 , Shu-ao He 1, 2, 3, 4, 5 , Xue-chuan Wang 1, 2, 3, 4, 5 , Chuan-yi Wang 5, 6, 7, 8
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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.
中文翻译：
葫芦状空心介孔二氧化硅颗粒支撑的Ag / AgBr肖特基结，可高效矿化四环素盐酸盐
盐酸四环素（TTC）是一种具有生物毒性的典型抗生素，对生态系统非常有害。光催化被认为是解决该问题的有效方法。然而，传统的光催化剂具有有限的光响应，不良的电荷传输和低的吸附能力，这实质上限制了它们的应用。在此，具有类似BET表面积（1181.57 m 2 g -1）和增强的光吸收被构造来支持Ag / AgBr肖特基结。光电化学特征证实，所制备的光催化剂的光学响应和电荷转移显着提高，因为Ag / AgBr肖特基结与氨基修饰的葫芦状HS粒子的协同作用促进了OH自由基的有效生成。最佳HS-银/溴化银（40％重量HSAA）显示出最高TTC降解活性（3.79×10 -2分钟-1）由于氧化还原反应被O 2 ˙ - / OH自由基，这是大约28.3倍更大比商用P25（1.34×10 -3 min -1）和比AgBr（2.96×10）大12.8倍-3分钟-1）。最重要的是，在照射90分钟/ 150分钟后，最佳40 wt％HSAA使约72.04％/ 81.17％的TTC矿化，这比文献中报道的P25和其他基于Ag / AgBr的光催化剂的TTC高。因此，这种新颖的结构可以完全分解TTC及其副产物，这项研究为有效处理生态系统中的抗生素污染提供了一种前瞻性的方法。
更新日期：2020-09-18
中文翻译：
葫芦状空心介孔二氧化硅颗粒支撑的Ag / AgBr肖特基结，可高效矿化四环素盐酸盐
盐酸四环素（TTC）是一种具有生物毒性的典型抗生素，对生态系统非常有害。光催化被认为是解决该问题的有效方法。然而，传统的光催化剂具有有限的光响应，不良的电荷传输和低的吸附能力，这实质上限制了它们的应用。在此，具有类似BET表面积（1181.57 m 2 g -1）和增强的光吸收被构造来支持Ag / AgBr肖特基结。光电化学特征证实，所制备的光催化剂的光学响应和电荷转移显着提高，因为Ag / AgBr肖特基结与氨基修饰的葫芦状HS粒子的协同作用促进了OH自由基的有效生成。最佳HS-银/溴化银（40％重量HSAA）显示出最高TTC降解活性（3.79×10 -2分钟-1）由于氧化还原反应被O 2 ˙ - / OH自由基，这是大约28.3倍更大比商用P25（1.34×10 -3 min -1）和比AgBr（2.96×10）大12.8倍-3分钟-1）。最重要的是，在照射90分钟/ 150分钟后，最佳40 wt％HSAA使约72.04％/ 81.17％的TTC矿化，这比文献中报道的P25和其他基于Ag / AgBr的光催化剂的TTC高。因此，这种新颖的结构可以完全分解TTC及其副产物，这项研究为有效处理生态系统中的抗生素污染提供了一种前瞻性的方法。
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