Fabricating the ternary CeO2@CNTs/CdSe composite with synchronously enhanced adsorption and photocatalytic activity toward water-soluble pollutants removal

光催化 材料科学 吸附 三元运算 化学工程 催化作用 碳纳米管 复合数 纳米颗粒 柯肯德尔效应 光电流 纳米技术 化学 复合材料 冶金 光电子学 有机化学 工程类 程序设计语言 计算机科学
作者
Liang Li,Shao-zhong Hu,Ting Huang,Nan Zhang,Yong Wang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:476: 146574-146574 被引量:12
标识
DOI:10.1016/j.cej.2023.146574
摘要

Constructing heterogeneous catalyst with different bandgaps is a prospect way to realize efficient charge transfer of catalytic redox reaction. Semiconductor-based catalyst as a prospective material can effectively solve sewage issues under light irradiation, but the efficiency is greatly influenced by the recombination rate of photoelectrons and holes. In this work, cerium dioxide (CeO2) nanoparticles (NPs) were grown in-situ on carbon nanotubes (CNTs), which can maintain the pollutant removal efficiency of pure CeO2 NPs and enhance the adsorption intensity under visible light for CeO2@CNTs composite. Furthermore, the introduction of cadmium selenide (CdSe) was conducive to establish built-in electronic field in the ternary CeO2@CNTs/CdSe catalyst, which effectively enhanced the catalytic activity of CeO2@CNTs/CdSe. In comparison to CNTs, CdSe, CeO2 and CeO2@CNTs composite, the ternary CeO2@CNTs/CdSe catalyst exhibited higher photocurrent intensity, lower recombination of photoelectrons and holes (e-/h+) pairs, indicating much better photocatalytic activity. CeO2@CNTs/CdSe as photocatalyst displayed excellent adsorption ability for Congo red (CR), which contributed to increase the transparency of reaction solution and improve the utilization rate to light, the evaluated degradation efficiency of CR achieved 83.58 % and the reduction ratio of Cr(VI) was nearly 100 %. This work confirms that CeO2@CNTs/CdSe composite with excellent adsorption and photocatalytic ability is a promising photocatalyst material in wastewater treatment.
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