摘要
通过超声分散和溶剂热法协同作用,将PVP复合到BiOCl/BiOBr材料的表面,合成PVP/BiOCl/BiOBr复合材料,通过调整NaCl及NaBr投加量,优化光催化剂中BiOBr与BiOCl的复合比。使用XRD、SEM和BET,研究复合前后光催化剂结构形态、比表面积及孔径的变化。结果表明,在PVP作用下,复合比为1∶1的BiOCl/BiOBr的光催化剂,其结构由密集型“松针状”结构转变为超薄多层的“玫瑰花瓣片状”结构,其比表面积较未改性的BiOCl/BiOBr显著提升。可见光照射下光催化降解联苯胺实验结果显示,照射180 min,PVP-BiOCl/BiOBr-1/1的联苯胺降解效果最佳,降解率为96.03%,约是原始BiOCl/BiOBr的1.57倍。结合自由基捕获实验结果,分析了PVP-BiOCl/BiOBr光催化降解联苯胺的可能机理。
PVP was synthesized onto the surface of BiOCl/BiOBr by the synergistic effect of ultrasonic dispersion and solvent-thermally to synthesize PVP/BiOCl/BiOBr composite.The compound ratio of BiOBr and BiOCl in photocatalyst was optimized by adjusting the dosage of NaCl and NaBr.XRD,SEM and BET were used to study changes of the structural morphology,specific surface area and pore size of photocatalyst before and after PVP composite.The results showed that the structure of BiOCl/BiOBr photocatalyst with a compound ratio of 1∶1 changed from an intensive pine needle structure to an ultrathin multi-layer rose petal sheet structure under PVP action.In addition,its specific surface area is significantly higher than that of unmodified BiOCl/BiOBr.The experimental results of benzidine degradation under visible light irradiation for 180 min indicated that the catalyst with the best degradation effect was PVP-BiOCl/BiOBr-1/1,and the degradation rate was 96.03%,which was about 1.57 times of the original BiOCl/BiOBr.The photocatalytic degradation mechanism of benzidine by PVP-BiOCl/BiOBr was analyzed on the basis of the result of free radical capture experiment.
作者
张龙
葛建华
陈羽冲
丁修龙
郑旭阳
ZHANG Long;GE Jian-hua;CHEN Yu-chong;DING Xiu-long;ZHENG Xu-yang(School of Earth and Environment,Anhui University of Science&Technology,Huainan 232001,China)
出处
《应用化工》
CAS
CSCD
北大核心
2021年第3期675-680,共6页
Applied Chemical Industry
基金
安徽自然科学基金(1808085ME139)
2020年度高校优秀人才支持计划项目(gxyq2020012)。
