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Fabrication of redox-mediator-free Z-scheme CdS/NiCo2O4 photocatalysts with enhanced visible-light driven photocatalytic activity in Cr(VI) reduction and antibiotics degradation
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 5.2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.colsurfa.2020.125582
Dongcheng Hu , Youyuan Xu , Shengya Zhang , Jibing Tu , Min Li , Lihua Zhi , Jiacheng Liu

Abstract Tremendous efforts have been made to design novel type semiconductor photocatalysts as promising candidates to solve the problem of aquatic pollution. However, the exploration of photocatalysts with high activity and stability for removing heavy metal ions and antibiotics from water through visible light photocatalysis is still a challenge. In this work, a series of Z-scheme photocatalysts X% CdS/NiCo2O4 (X = 30, 40, 50, 60, 70) have been successfully constructed by a hydrothermal method. By anchoring the CdS nanoparticles on the surface of NiCo2O4 nanosheets, the obtained CdS/NiCo2O4 exhibits the narrower bandgap energy compare to CdS nanoparticles, which can enhance the visible light harvesting efficiency and suppress the electron-hole recombination, improving the photocatalytic activity. Moreover, the introduction of NiCo2O4 nanosheets cannot only inhibit the aggregation of CdS nanoparticles and increase the stability of the composite, but also improve the adsorption of pollutants on the surface of the composite. By virtue of these advantages, the best-performing CdS/NiCo2O4 (60 % CdS/NiCo2O4) revealed outstanding visible-light driven photocatalytic activity toward the degradation of Cr (VI) and Tetracycline Hydrochloride (TC−HCl) under the irradiation of a low energy consuming light (LED lamp, 5 W). Compared with pure CdS nanopaticles, the catalytic performance of 60 % CdS/NiCo2O4 for Cr (VI) and TC−HCl increased approximately 3.9 times and 32.7 times, respectively. Furthermore, the 60 % CdS/NiCo2O4 exhibits fantastic recyclability, its catalytic activity is nearly unchanged even after six cycles. Meaningfully, as an efficient visible-light photocatalyst, 60 % CdS/NiCo2O4 can be applied to reduction of Cr (VI) and degradation of TC−HCl in natural water samples (Yellow River water, which collected in Lanzhou section), which greatly expanded its application in practice.

中文翻译:

制备无氧化还原介体的 Z 型 CdS/NiCo2O4 光催化剂,在 Cr(VI) 还原和抗生素降解中具有增强的可见光驱动光催化活性

摘要 设计新型半导体光催化剂作为解决水体污染问题的有希望的候选物已经做出了巨大的努力。然而,探索具有高活性和稳定性的光催化剂通过可见光光催化去除水中的重金属离子和抗生素仍然是一个挑战。在这项工作中,通过水热法成功构建了一系列 Z 型光催化剂 X% CdS/NiCo2O4 (X = 30, 40, 50, 60, 70)。通过将 CdS 纳米粒子锚定在 NiCo2O4 纳米片的表面,获得的 CdS/NiCo2O4 与 CdS 纳米粒子相比具有更窄的带隙能量,可以提高可见光捕获效率并抑制电子-空穴复合,提高光催化活性。而且,NiCo2O4纳米片的引入不仅可以抑制CdS纳米粒子的聚集,增加复合材料的稳定性,而且可以提高复合材料表面对污染物的吸附。凭借这些优势,性能最佳的 CdS/NiCo2O4(60% CdS/NiCo2O4)在低光照条件下对 Cr (VI) 和四环素盐酸盐 (TC-HCl) 的降解表现出出色的可见光驱动光催化活性。耗能灯(LED 灯,5 W)。与纯 CdS 纳米颗粒相比,60% CdS/NiCo2O4 对 Cr (VI) 和 TC-HCl 的催化性能分别提高了约 3.9 倍和 32.7 倍。此外,60% CdS/NiCo2O4 表现出极好的可回收性,即使经过六个循环,其催化活性几乎没有变化。有意义的是,
更新日期:2021-01-01
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