In-situ fabrication of novel BiOCl/Bi5O7I 2D/3D heterostructures with enhanced photocatalytic activity

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2022-02-25 DOI:10.1016/j.jallcom.2021.162669

Wendi Huang , Xinyan Xiao , Mingli Lu , Yu Xiao

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引用次数: 22

Abstract

A novel BiOCl/Bi₅O₇I (BOC-BOI) heterojunction was prepared by growing ultrathin 2D BiOCl nanosheets in situ on the surface of 3D Bi₅O₇I microspheres. The 2D/3D heterostructure of BOC-BOI composites inhibited the agglomeration of BiOCl nanosheets, and benefited the multiple reflection and refraction of light, which greatly enhanced the absorption and utilization of light. The 50-BOC-BOI composite showed 97.7% degradation efficiency of rhodamine B (RhB) after 70 min Xe light irradiation. And its apparent degradation rate constant (k) was 0.0377 min⁻¹, being 4.9 and 15.1 times than that of pristine BiOCl (0.0077 min⁻¹) and Bi₅O₇I (0.0025 min⁻¹), respectively. The enhanced photocatalytic activity of BOC-BOI composites was attributed to stronger light capture ability, more abundant active sites and higher charge carrier separation efficiency, confirmed by UV-Vis DRS, SEM, TEM, BET, Zeta potential and electrochemical characterizations. The free radical capture experiments showed that the main active species in this system were holes (h⁺) and superoxide free radicals (·O₂⁻). Combining the results of UV-Vis DRS and Mott-Schottky test, a reasonable type II heterojunction mechanism was proposed.

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具有增强光催化活性的新型BiOCl/Bi5O7I二维/三维异质结构的原位制备

通过在三维Bi5O7I微球表面原位生长超薄二维BiOCl纳米片，制备了一种新型BiOCl/Bi5O7I (BOC-BOI)异质结。BOC-BOI复合材料的2D/3D异质结构抑制了BiOCl纳米片的团聚，有利于光的多次反射和折射，大大增强了对光的吸收和利用。50-BOC-BOI复合材料经70 min Xe光照射后，对罗丹明B (RhB)的降解效率为97.7%。其表观降解速率常数(k)为0.0377 min−1，分别是原始BiOCl (0.0077 min−1)和Bi5O7I (0.0025 min−1)的4.9倍和15.1倍。通过UV-Vis DRS、SEM、TEM、BET、Zeta电位和电化学表征，证实了BOC-BOI复合材料的光催化活性增强是由于具有更强的光捕获能力、更丰富的活性位点和更高的电荷载流子分离效率。自由基捕获实验表明，该体系的主要活性物质为空穴自由基(h+)和超氧自由基(·O2−)。结合UV-Vis DRS和Mott-Schottky测试结果，提出了合理的II型异质结机理。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.