To the best of our knowledge, in few studies, biochar (BC)-based materials have been used as the photocatalyst for water purification, and their application is limited to a great extent due to catalyst agglomeration and inefficient electron migration. In this study, a novel Bi2WO6 loaded N, S co-doping corn straw biochar (Bi2WO6/NSBC) was successfully synthesized with a simple solvothermal method for the removal of ciprofloxacin (CIP) and Cr(VI) under visible light irradiation. The Bi2WO6/NSBC was featured with efficient and rapid catalytic removal toward CIP (5 mg/L) and Cr(VI) (10 mg/L), with efficiencies of ∼90.33% and ∼99.86% within 75 min, respectively. More attractively, this composite can be applied in a wide pH range (3.0–9.0) and with weak effects by coexisting ions (Cl−, CO32−, SO42−, and Ca2+). The facile synthesized porous graphitized structure demonstrates an outstanding performance of superior conductivity and promoted photoelectron transport. Meanwhile, it is found that N, S co-doping of the BC induces highly interconnected fibrous structures, high catalytic property, and favorable specific surface areas, which is considered to avoid agglomeration of Bi2WO6. The increased photocatalytic activity results from the synergistic effects of Bi2WO6 and NSBC by the optimized band gap and enhanced visible light response, due to higher migration and utilization efficiency of photoinduced carriers in photocatalytic reactions. In this approach, a cheap catalyst is provided, and at the same time, a synergistic effect of N, S co-doping is formed to rapidly remove contaminants in wastewater treatment.

中文翻译：

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Facile 组装的 N， S 共掺杂玉米秸秆生物炭负载 Bi2WO6 具有增强的富电子特性，用于高效光催化去除环丙沙星和 Cr（VI）


据我们所知，在少数研究中，基于生物炭 （BC） 的材料被用作水净化的光催化剂，由于催化剂团聚和电子迁移效率低下，其应用在很大程度上受到限制。在本研究中，采用简单的溶剂热法成功合成了一种新型的负载 N、S 共掺杂玉米秸秆生物炭 （Bi2WO6/NSBC），用于在可见光照射下去除环丙沙星 （CIP） 和 Cr（VI）。Bi2WO6/NSBC 对 CIP （5 mg/L） 和 Cr（VI） （10 mg/L） 具有高效、快速的催化去除作用，在 75 分钟内的效率分别为 ∼90.33% 和 ∼99.86%。更有吸引力的是，这种复合材料可以在较宽的 pH 范围 （3.0–9.0） 中应用，并且通过共存离子（Cl−、CO32−、SO42− 和 Ca2+）的效果较弱。简单合成的多孔石墨化结构表现出优异的导电性和促进光电子传输的出色性能。同时，发现 BC 的 N、S 共掺杂诱导了高度互连的纤维结构、高催化性能和有利的比表面积，这被认为避免了 Bi2WO6 的团聚。由于光诱导载流子在光催化反应中具有更高的迁移和利用效率，Bi2WO6 和 NSBC 通过优化的带隙和增强的可见光响应的协同作用，光催化活性的增加是由于。在这种方法中，提供了一种廉价的催化剂，同时形成了 N、S 共掺杂的协同效应，以快速去除废水处理中的污染物。