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The synthesis of novel FeS2/g-C3N4 nanocomposites for the removal of tetracycline under visible-light irradiation
Environmental Science: Water Research & Technology ( IF 5 ) Pub Date : 2021-5-25 , DOI: 10.1039/d1ew00026h
Shengwang Gao 1, 2 , Yang Liu 1, 2, 3 , Jianchao Zhu 1, 2 , Yaqiao Wang 4 , Xue Han 4 , Xunfeng Xia 1, 2 , Xiang Zhao 1, 2
Affiliation  

Novel FeS2/g-C3N4 (FC) composites were successfully constructed using an impregnation–calcination method, and they demonstrated a wonderful visible-light catalytic performance compared with unmodified g-C3N4 and FeS2. The structures, morphologies, and chemical states of the samples were characterized. The photocatalytic performance was assessed based on the removal of tetracycline (TC) under visible light. The removal of TC by 20%-FC reached 83.5% within 180 min, much higher than when using g-C3N4 or FeS2. The improved degradation of TC was a result of the introduction of FeS2, which obviously enhanced the separation of photogenerated carriers at the firmly contacted interface. The effects of the key operating parameters were further explored, including the doping ratio, the concentration of photocatalyst, and the pH value. The photocatalytic theory of charge division was demonstrated using quenching experiments and electron spin resonance (ESR) studies. Finally, the FeS2/g-C3N4 composite exhibited remarkable recyclability and stability. This study creates new prospects for the synthesis of photocatalysts and for the degradation of resistant organic pollutants for environmental remediation.

中文翻译:

可见光下去除四环素的新型FeS2/g-C3N4纳米复合材料的合成

使用浸渍-煅烧方法成功构建了新型 FeS 2 /gC 3 N 4 (FC) 复合材料,与未改性的 gC 3 N 4和 FeS 2相比,它们表现出出色的可见光催化性能。表征了样品的结构、形态和化学状态。基于在可见光下去除四环素(TC)来评估光催化性能。20%-FC 对 TC 的去除在 180 分钟内达到 83.5%,远高于使用 gC 3 N 4或 FeS 2 时。TC 降解的改善是引入 FeS 2 的结果,这明显增强了牢固接触界面处光生载流子的分离。进一步探讨了关键操作参数的影响,包括掺杂比、光催化剂浓度和 pH 值。使用猝灭实验和电子自旋共振 (ESR) 研究证明了电荷分配的光催化理论。最后,FeS 2 /gC 3 N 4复合材料表现出显着的可回收性和稳定性。该研究为光催化剂的合成和降解抗性有机污染物以进行环境修复创造了新的前景。
更新日期:2021-06-08
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