摘要
针对大多数半导体可见光催化剂光生载流子容易复合、光催化活性受限制的问题,制备了Cu元素掺杂BiVO_(4)可见光催化剂,对BiVO_(4)结构进行修饰以提高其光催化活性。通过X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线能谱(XPS)和紫外-可见漫反射光谱(UV-vis)对其进行了表征,对Cu掺杂BiVO_(4)光催化剂的光催化活性和稳定性进行了检测。结果表明,制备的样品纯度较高,Cu掺杂后并未改变BiVO_(4)的晶体结构,部分Bi^(3+)离子被Cu^(2+)取代,从而提高了BiVO_(4)的可见光催化活性。Cu掺杂BiVO_(4)催化剂能够在可见LED光照射下,活化过一硫酸盐(PMS)进行光催化降解染料橙黄Ⅱ。当催化剂投加量为0.5 g·L^(-1)、过一硫酸盐投加量为0.6 mmol·L^(-1),反应60 min后,Cu掺杂BiVO_(4)催化剂对橙黄Ⅱ的降解率最高。经过Cu掺杂后,光生电子和空穴的分离效率有所提高,增强了BiVO_(4)的光催化活性。Cu-BiVO_(4)光催化剂经5次重复使用后,对橙黄Ⅱ的降解效率仍然可以达到78.3%以上,其展现出优异的催化稳定性。
Aiming at the problems of easy recombination of photocarriers and restriction of catalytic activity of most semiconductor visible light catalysts,Cu-BiVO_(4)was successfully prepared through one-step hydro-thermal method by doping copper into the structure of BiVO_(4)for its activity enhancement.Cu-BiVO_(4)was characterized by XRD,SEM,TEM,XPS and UV-vis Method.The photocatalytic activity and stability of Cu dopped BiVO_(4)catalyst were detected.The results showed that the prepared Cu-BiVO_(4)was high purity,Cu dopping didn’t change the crystal structure of BiVO_(4),some Bi^(3+)ions were substituted by Cu^(2+)ions,then the visible light catalytic activity of BiVO_(4)increased.Under the irradiation of visible LED light,Cu-BiVO_(4)could activate peroxymonosulfate(PMS)and photocatalytic degrade orangeⅡ.The results revealed that the highest degradation efficiency of orangeⅡoccurred at Cu-BiVO_(4)dosage of 0.5 g·L^(-1),PMS concentration of 0.6 mmol·L^(-1)and 60 min oxidation.The catalytic performance of Cu-BiVO_(4)was better than that of pure BiVO_(4).And the degradation efficiency of orangeⅡcould still maintain over 78.3%after Cu-BiVO_(4)recycled for five times,which indicated a good stability of Cu-BiVO_(4).By the introduce of copper element into the structure of BiVO_(4),the separation efficiency of photo generated electrons and holes increased,which enhanced the catalytic activity of BiVO_(4),made Cu-BiVO_(4)an effective photocatalytic catalyst with good catalytic and reusable properties.
作者
钟欣
阮韬
白壑平
黄伟
周彬学
ZHONG Xin;RUAN Tao;BAI Heping;HUANG Wei;ZHOU Binxue(Real State College,Beijing Normal University,Zhuhai,Zhuhai 519000,China;College of Education for the Future,Beijing Normal University at Zhuhai,Zhuhai 519000,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第3期857-866,共10页
Chinese Journal of Environmental Engineering
基金
广东省普通高校青年创新人才基金项目-青年项目(201912017QX)
广东省普通高校创新人才基金项目(2020KTSCX177)
大学生创新创业项目-省级项目(S202013177014)
北京师范大学珠海分校环境科学与工程专业虚拟仿真实验教学-质量工程项目(201832)
广东省“十三五”规划高校青年教师高等教育课题-普通项目(19GYB060)。
作者简介
第一作者/通信作者:钟欣(1986-),女,博士,讲师。研究方向:水污染处理。E-mail:zhongxin@bnu.edu.cn。
