Nanocomposites of GaBr3 and BiBr3 Nanocrystals on BiOBr for the Photocatalytic Degradation of Dyes and Tetracycline

甲基橙 纳米复合材料 罗丹明B 光降解 光催化 光致发光 材料科学 傅里叶变换红外光谱 X射线光电子能谱 核化学 可见光谱 化学工程 光化学 化学 纳米技术 有机化学 催化作用 光电子学 工程类
作者
Moumita Mondal,Samrat Banerjee,S. Mal,Sachindranath Das,S.K. Pradhan
出处
期刊:ACS applied nano materials [American Chemical Society]
卷期号:5 (10): 15676-15691 被引量:9
标识
DOI:10.1021/acsanm.2c03696
摘要

In recent past decades, semiconductor-based photocatalysts have been studied worldwide as a promising technique for the degradation of organic dyes in wastewater. In this study, a nanoplate-like Bi-based heterojunction (BGB-1, -2, and -3) has been prepared for the first time through the in situ formation of BiBr3 and GaBr3 nanocrystals on the surface of BiOBr via a facile water bath method, followed by the hydrothermal process with a change in the composition. Multiple physiochemical processes such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared are analyzed to reveal the structural properties. The Brunauer–Emmett–Teller, UV–vis diffuse-reflectance, and photoluminescence spectra have been utilized for detailed analysis of the surface area, grain boundary, lattice imperfections, and light absorption properties. The photocatalytic activity and quantum efficiency of the as-synthesized nanocomposites have been evaluated by the photodegradation of Rhodamine B (RhB), methylene blue, methyl orange, Congo red, phenolic compounds, and colorless antibiotic tetracycline with visible-light illumination. Compared to pure BiOBr or the precursor materials, Bi-based nano/photocatalysts exhibit a significantly enhanced photocatalytic activity. Moreover, it is seen that the nanocomposite with a composition of 0.1 mol of Ga(NO3)3·xH2O and 2.9 mol of Bi(NO3)3·5H2O (BGB-1 nanocomposite) shows the highest photocatalytic activity against RhB degradation (∼100% within 20 min) and tetracycline antibiotic (∼92% within 20 min). The significantly improved photoreactivity has been ascribed to the effective separation of photogenerated electron–hole pairs and superoxide radical anions (•O2–). The hole (h+) also greatly impacts the degradation mechanism. Bi-based nanocomposites are found to kill Gram-positive and Gram-negative bacteria. These nanocomposites have been designed as efficient visible-light-driven heterojunction photocatalytic materials with significant antibacterial activity for wastewater purification.
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