Study on the Enhancement of Efficiency, Photocatalytic Kinetics, and Mechanism of Trace GO on TiO2 for Cr(VI) Removal Under Visible Light Conditions

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Surveys from Asia Pub Date : 2024-01-12 DOI:10.1007/s10563-023-09414-x

Yinwei Wu, Xu Du, Jingyuan Pan, Qiaoyun Zhou, Jinghong Zhang, Ming Li, Dong Fu

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引用次数: 0

Abstract

This work focuses on the enhancement of removal performance of TiO₂ by the introduction of trace amout of GO composite. Among various synthesis methods, it was found that the GO–doped TiO₂ by microwave-assisted hydrothermal method had the highest performance in the improvement for Cr (VI) treatment. The removal rate of Cr (VI) by TiO₂–GO (0.05%) was 95.96% which is 13.58% higher than that of TiO₂. It can be confirmed that GO was successfully doped on TiO₂ by XRD, XPS, and FT-IR characterizations. In addition, SEM, TEM, N₂ adsorption isotherm, UV–Vis spectra, and photocurrent response elucidate the mechanism of potency enhancement. The addition of trace GO reduces the particle size of TiO₂ and results in the agglomeration phenomenon of TiO₂, so that the specific surface area of TiO₂ becomes larger and the distribution is more uniform, which expands the photoresponse range, and elevating the photoelectron response. Thus, the absorption ability of visible light is greatly improved. The reported method provides a more economical option for treating Cr(VI) wastewater.

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可见光条件下痕量 GO 在 TiO_2 上去除六价铬的效率、光催化动力学和机理研究

这项研究的重点是通过引入微量的 GO 复合材料来提高 TiO2 的去除性能。研究发现，在各种合成方法中，微波辅助水热法掺杂 GO 的 TiO2 对六价铬处理的改善效果最好。TiO2-GO (0.05%) 对六价铬的去除率为 95.96%，比 TiO2 高出 13.58%。通过 XRD、XPS 和 FT-IR 表征，可以证实在 TiO2 上成功掺杂了 GO。此外，扫描电镜、电子显微镜、N2 吸附等温线、紫外可见光谱和光电流响应也阐明了效力增强的机制。痕量 GO 的加入减小了 TiO2 的粒径，导致 TiO2 出现团聚现象，使 TiO2 的比表面积变大，分布更加均匀，从而扩大了光响应范围，提高了光电子响应。从而大大提高了对可见光的吸收能力。所报告的方法为处理六价铬废水提供了一种更经济的选择。

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来源期刊

Catalysis Surveys from Asia 化学-物理化学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.