氯氧化铋简便合成及其光催化降解对硝基苯酚性能

doi:10.19964/j.issn.1006-4990.2021-0776

摘要/Abstract

摘要：

光催化降解是一种有效的处理环境污染物的方法。氯氧化铋（BiOCl）已成为传统光催化剂的潜在替代品，并显示出优异的性能。采用简单的机械搅拌法合成了BiOCl光催化剂，并通过扫描电镜（SEM）、透射电镜（TEM）、红外光谱（FT-IR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、氮气吸附-脱附和紫外-可见漫反射光谱（UV-Vis DRS）等对其形貌、组成、结构、比表面积以及光学性能进行了表征。结果显示，制备的BiOCl显示出二维纳米薄片状形貌，带隙宽度为3.3 eV。利用光催化降解对硝基苯酚（PNP）为模拟反应评估了BiOCl的光催化活性。受益于BiOCl表面高暴露的（110）晶面，在80 min、BiOCl投加量为0.4 g/L条件下，BiOCl对PNP的去除率高达99.7%。动力学研究表明，该降解过程符合一级动力学方程，动力学常数为0.043 min^-1。自由基捕获实验证实，该降解过程中主要的自由基为?O₂^-和?OH。此外，还分析了BiOCl降解PNP的机理。研究结果为光催化法治理废水提供了有价值的信息和参考。

关键词: 光催化, 降解, 氯氧化铋, 自由基

Abstract:

Photocatalytic degradation is an effective method for treating environmental pollutants.Bismuth oxychloride（BiOCl） has emerged as a potential alternative to traditional photocatalysts and has shown excellent performance.BiOCl catalyst was synthesized by a simple mechanical agitation method，and its morphology，composition，structure，specific surface area and optical properties were characterized by scanning electron microscopy（SEM），transmission electron microscopy（TEM），infrared spectroscopy（FT-IR），X-ray diffraction（XRD），X-ray photoelectron spectroscopy（XPS），N₂adsorption?desorption and UV-Vis-diffuse reflectance（UV-VIS-DRS）.The results showed that the as?obtained BiOCl exhibited a two?dimensional nanosheet morphology with a band gap of 3.3 eV.The photocatalytic degradation of p-nitrophenol（PNP） was employed as a model reaction to evaluate the photocatalytic activity of BiOCl.Bene?ting from the high exposed（110） facet，degradation of PNP could be 99.7% by BiOCl with catalyst concentration of 0.4 g/L in 80 min. Kinetic studies showed that the degradation process was following the first order kinetic model with the kinetic constant of 0.043 min^-1. Radical capture experiment demonstrated that ·O₂^- and ·OH played the main roles in the degradation process.Besides，the photocatalytic degradation mechanism of p-nitrophenol by BiOCl was also proposed. The results offered valuable information and reference for the treatment of wastewater through photocatalytic processes.

Key words: photocatalysis, degradation, BiOCl, radicals

中图分类号:

O652.6

仝海娟,李思琦,范方方,左卫元,史兵方. 氯氧化铋简便合成及其光催化降解对硝基苯酚性能[J]. 无机盐工业, 2022, 54(9): 157-162.

TONG Haijuan,LI Siqi,FAN Fangfang,ZUO Weiyuan,SHI Bingfang. Facile synthesis of bismuth oxychloride and its photocatalytic degradation performance of p-nitrophenol[J]. Inorganic Chemicals Industry, 2022, 54(9): 157-162.

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污染物	BiOCl加入量/ （g·L^-1）	一级动力学参数
污染物	BiOCl加入量/ （g·L^-1）	k₁/min^-1	b	R²
PNP	0.0	0.001	0.001	0.994 5
	0.1	0.011	0.061	0.984 3
	0.2	0.015	0.092	0.992 2
	0.3	0.027	-0.002	0.988 2
	0.4	0.043	-0.024	0.992 1
	0.5	0.026	-0.011	0.989 6

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