[1]赵博,夏静芬,杨国靖,等.Bi2MoO6/AgBr的制备及其光催化活性增强机制[J].中国给水排水,2022,38(1):23-30.
　ZHAO-Bo,XIA-Jing fen,YANG-Guo jing,et al.Preparation of Bi2MoO6/AgBr and Its Photocatalytic Activity Enhancement Mechanism[J].China Water & Wastewater,2022,38(1):23-30.
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Bi2MoO6/AgBr的制备及其光催化活性增强机制

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第1期 页码: 23-30 栏目: 出版日期: 2022-01-01
Title:
Preparation of Bi2MoO6/AgBr and Its Photocatalytic Activity Enhancement Mechanism
作者:

赵博1， 夏静芬1， 杨国靖1,2， 张超妍1， 谢周云1， 唐力1， 张妮1， 王冬波1,2

（1.浙江万里学院 生物与环境学院，浙江 宁波 315100；2.湖南大学 环境科学与工程学院，湖南 长沙 410082）

Author(s):
ZHAO-Bo1， XIA-Jing fen1， YANG-Guo jing1，2， ZHANG-Chao yan1， XIE-Zhou yun1， TANG-Li1， ZHANG-Ni1， WANG-Dong bo1，2
（1. College of Biological and Environmental Sciences， Zhejiang Wanli University， Ningbo 315100， China； 2. College of Environmental Science and Engineering， Hunan University， Changsha 410082， China）
关键词:

光催化;  Z型异质结;  Bi2MoO6;  AgBr;  罗丹明B

Keywords:
photocatalysis;  Z type heterojunction;  Bi2MoO6;  AgBr;  rhodamine B
摘要:
采用水热法合成了Z型异质结Bi2MoO6/AgBr光催化剂，利用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、比表面积测试仪（BET）、稳态/瞬态荧光光谱仪等对其微观形貌、物相组成以及光电性能等特性进行表征；通过对目标污染物罗丹明B（RhB）的降解分析该催化剂的活性和降解机理。结果表明，该催化剂由立方相的Bi2MoO6纳米片堆叠而成的纳米微球和负载在其表面的AgBr纳米花簇构成，异质结的形成使得比表面积增加了7.2 m2/g，光生电子对寿命延长。Bi2MoO6与AgBr复合后光催化活性明显提高，当AgBr复合量为10%时效果最佳，光催化反应速率常数是Bi2MoO6的1.6 倍。当RhB浓度为0.5×10-5 mol/L、Bi2MoO6/AgBr投加量为250 mg/L、pH值=7时，反应20 min后对RhB的降解率可达到95.9%，且Bi2MoO6/AgBr经过5 次循环实验后仍具有较高的光催化活性。自由基捕获实验结果表明，Bi2MoO6的主要活性基为·O2-，Bi2MoO6/AgBr的主要活性基团为·O2-和h+。根据以上实验结果，提出了一种由Ag0粒子为通道的Z型电荷转移机理。
Abstract:
Z?type heterojunction Bi2MoO6/AgBr photocatalyst was synthesized by hydrothermal method, and its microscopic morphology, phase composition and photoelectric properties were characterized by SEM, XRD, BET, UV?Vis spectrophotometer and transient/steady fluorescence spectrophotometer. Meanwhile, the activities and degradation mechanism of the catalysts were analyzed by degradation of rhodamine B (RhB). The catalyst was composed of stacked Bi2MoO6 nanosheets in cubic phase and AgBr nanoflower clusters loaded on its surface. The formation of heterojunction increased the specific surface area by 7.2 m2/g and prolonged the lifetime of photogenerated electron pair. Photocatalytic activity of Bi2MoO6 loaded with AgBr was significantly improved. The best performance was obtained when the loaded amount of AgBr was 10%, and the rate constant of the corresponding photocatalytic reaction was 1.6 times higher than that of single Bi2MoO6 as the photocatalyst. When the RhB concentration was 0.5×10-5 mol/L, the Bi2MoO6/AgBr dosage was 250 mg/L and pH was 7, the degradation rate of RhB reached 95.9% after 20 min of reaction, and the Bi2MoO6/AgBr still had high photocatalytic activity after 5 cycles of experiments. The radical trapping experiments indicated that the main active group of Bi2MoO6 was ·O2-, and the main active groups of Bi2MoO6/AgBr were ·O2- and h+. According to the above experimental results, a Z-type charge transfer mechanism with Ag0 particles as channels was proposed.
更新日期/Last Update: 2022-01-01