摘要
可见光有效利用率低、光生载流子复合快是导致传统光催化剂在应用于降解水中有机污染物中效率不高、应用受限的主要原因。碳量子点(carbon quantum dots,CQDs)作为新兴的纳米零维材料,用其修饰半导体光催化剂能够抑制光生载流子复合、加速载流子的分离与转移、改善光谱响应范围、增强吸附性能、促进间接氧化过程中过渡金属还原,有效增强光催化剂催化降解水中有机污染物。本文主要介绍了CQDs修饰半导体复合光催化剂材料在降解水中各类有机污染物中的应用,重点阐述了CQDs及其修饰半导体复合光催化剂材料的合成以及CQDs在多相光催化体系中的增强作用;简要说明了光降解实验参数、CQDs改性对光催化反应活性的影响;最后对CQDs修饰半导体复合光催化剂发展过程中尚待解决的问题进行了总结并对未来发展方向进行了展望。
The primary causes of the low efficiency and limited use of conventional photocatalysts in the degradation of organic pollutants in water are the low effective utilisation of visible light and the fast recombination rate of photogenerated charge carrier.Carbon quantum dots(CQDs),a novel nano-zero dimensional material that modifies semiconductor photocatalysts,can inhibit the recombination of photogenerated carriers,speed up the separation and transfer of carriers,improve the spectral response range,improve the performance of adsorption,promote the reduction of transition metals in the indirect oxidation process and effectively enhance the photocatalytic degradation of organic pollutants in water.This paper reviewed the application of CQDs modified semiconductor composite photocatalyst materials in the degradation of various organic pollutants in water.It focused on the synthesis strategy of CQDs and its modified semiconductor composite photocatalyst materials as well as the enhancement of CQDs in multiphase photocatalytic systems.Furthermore,a brief description was given of the effects of the photocatalytic experimental parameters and the modification of CQDs on the photocatalytic reaction activity.Finally,this paper summarized the unresolved issues during the development of CQDs modified semiconductor composite photocatalysts and gave an outlook on the future development direction.
作者
章萍萍
丁书海
高晶晶
赵敏
俞海祥
刘玥宏
谷麟
ZHANG Pingping;DING Shuhai;GAO Jingjing;ZHAO Min;YU Haixiang;LIU Yuehong;GU Lin(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第10期5487-5500,共14页
Chemical Industry and Engineering Progress
关键词
碳量子点
半导体
光催化剂
复合材料
降解
有机污染物
carbon quantum dots(CQDs)
semiconductor
photocatalyst
composites
degradation
organic pollutants
