BiOBr/BiOIO_(3)复合材料的合成及光催化性能研究  

Synthesis and photocatalytic performance of BiOBr/BiOIO_(3) composite

作　　者：徐成栋 胡浩[1] 王安慰 邵敏[1] 万玉山[1] XU Chengdong;HU Hao;WANG Anwei;SHAO Min;WAN Yushan(School of Enironmental Science&Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学环境科学与工程学院,江苏常州213164

出　　处：《工业水处理》2022年第12期91-99,共9页Industrial Water Treatment

基　　金：江苏省研究生实践创新项目(SJCX20_0935)。

摘　　要：构建异质结是促进光生载流子分离的有效途径,并可提高半导体光催化材料的光催化活性。采用水热法制备了BiOBr和BiOIO_(3),用超声浸渍法制备BiOBr/BiOIO_(3)复合光催化材料。通过XRD、SEM、TEM、XPS、UV-Vis、FT-IR和PL等表征方法分析了材料的多相结构和化学键。以罗丹明B和环丙沙星为目标污染物,通过降解实验分析光催化材料的活性和降解机理。结果表明:可见光照射60 min后,1.4-BiOBr/BiOIO_(3)对罗丹明B的降解率,达98%,降解速率常数为0.06894 min^(-1),且5次重复实验后降解率仍可达到85%;可见光照射120 min后,1.4-BiOBr/BiOIO_(3)对环丙沙星的降解率可达82.6%。以上实验结果可归结为BiOBr/BiOIO_(3)异质结构在BiOBr和BiOIO_(3)之间存在协同作用,异质结的形成拓宽了半导体的可见光吸收范围,阻止光生电子-空穴的复合。自由基捕获实验表明O_(2)^(·-)和h^(+)是降解过程的主要活性物种。提出了BiOBr/BiOIO_(3)材料光催化降解罗丹明B的可能机理,以期为设计和制备高效、绿色、稳定的光催化剂提供新的途径。The construction of heterojunction is an effective way to promote the separation of photocarrier and to improve the photocatalytic activity of semiconductor photocatalytic materials.BiOBr and BiOIO_(3)were prepared by hydrothermal method,and BiOBr/BiOIO_(3)composite photocatalytic materials were prepared by ultrasonic impregnation method.The polyphase structures and chemical bonds of the materials were analyzed by XRD,SEM,TEM,XPS,UV-Vis,FT-IR and PL characterization methods.The activity and degradation mechanism of the photocatalytic materials were analyzed using Rhodamine B and ciprofloxacin as the target pollutants.The results showed that the degradation rate of 1.4-BiOBr/BiOIO_(3)was 98%for Rhodamine B after 60 min of visible light irradiation,and the degradation rate constant was 0.06894 min^(-1),and the degradation rate could still reach 85%after five repeated experiments.The degradation rate of ciprofloxacin by 1.4-BiOBr/BiOIO_(3)was 82.6%after 120 min of visible light irradiation.The above experimental results can be attributed to the synergistic effect of BiOBr/BiOIO_(3)heterostructure between BiOBr and BiOIO_(3).The formation of heterojunction broadens the visible light absorption range of the semiconductor and prevents the recombination of electron and holes.The radical capture experiments showed that O_(2)^(·-)and h^(+)were the main active species in the degradation process.A possible mechanism for the photocatalytic degradation of Rhodamine B by BiOBr/BiOIO_(3)was proposed with a view to provide a new way to design and prepare efficient,green and stable photocatalysts.

关 键 词：光催化 异质结 染料废水 纳米材料 

分 类 号：X703[环境科学与工程—环境工程]