Ag_(3)PO_(4)修饰AgBr纳米线/Ti_(3)C_(2)双异质结光催化剂降解罗丹明B  

Ag_(3)PO_(4)-decorated AgBr nanowires/Ti_(3)C_(2)double heterostructure photocatalyst for degradation of Rhodamine B

作　　者：曾武军[1] 曾斌[1] 彭巧 宁旭涛 张明[3] ZENG Wujun;ZENG Bin*;PENG Qiao;NING Xutao;ZHANG Ming(College of Mechanical Engineering,Hunan University of Arts and Science,Changde 415000,Hunan,China;School of Materials and Environmental Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,Hunan,China;Research Institute of Hunan University in Chongqing,Chongqing 401120,China)

机构地区：[1]湖南文理学院机械工程学院,湖南常德415000 [2]湖南人文科技学院材料与环境工程学院,湖南娄底417000 [3]湖南大学重庆研究院,重庆401120

出　　处：《精细化工》2024年第11期2397-2404,共8页Fine Chemicals

基　　金：重庆市自然科学基金项目(cstc2021jcyj-msxmX0459)。

摘　　要：以十六烷基三甲基溴化铵(CTAB)为模板和溴源,通过添加Ti_(3)C_(2)MXene,使用共沉淀法制备了Ag_(3)PO_(4)修饰AgBr纳米线/Ti_(3)C_(2)双异质结光催化剂(Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)),采用SEM、TEM、XRD、XPS、紫外-可见漫反射光谱、荧光光谱对Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)进行了表征。以罗明丹B(RhB)为目标降解物,考察了质量分数1%的Ti_(3)C_(2)水分散液添加量对Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)光催化降解RhB的影响。结果表明,层状Ti_(3)C_(2)分布在AgBr纳米线周围,Ag_(3)PO_(4)纳米粒子修饰在两者之上,3种化合物之间形成Z型和肖特基双异质结;质量分数1%的Ti_(3)C_(2)分散液添加量为0.5 g制备的Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)-5具有最佳的光催化降解RhB性能,30 mg该光催化剂对30 mL质量浓度为10 mg/L RhB溶液的降解率为94.4%;超氧自由基和羟基自由基是Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)光催化降解RhB过程中起主要作用的活性物种;AgBr、Ag_(3)PO_(4)、Ti_(3)C_(2)三者之间形成的Z型和肖特基双异质结增强了光生电子-空穴对(e--h+)的分离效率,提升了Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)光催化性能。Ag_(3)PO_(4)-decorated AgBr nanowires/Ti_(3)C_(2)double heterostructure photocatalyst(Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2))were synthesized from co-precipitation of cetyltrimethylammonium bromide(CTAB)and Ti_(3)C_(2)MXene,and characterized by SEM,TEM,XRD,XPS,UV-Vis diffuse reflectance and fluorescence spectra.The effect of addition amount of Ti_(3)C_(2)aqueous dispersion with 1%mass fraction on the Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)photocatalytic performance for Rhodamine B(RhB)degradation was investigated.The results showed that layered Ti_(3)C_(2)was dispersed around AgBr nanowires and Ag_(3)PO_(4)nanoparticles decorated them,thus forming double heterostructure of Z-scheme and Schottky.Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)-5 prepared by adding 0.5 g Ti_(3)C_(2)dispersion with 1%mass fraction exhibited the best photocatalytic performance for RhB degradation.The RhB(30 mL,mass concentration of 10 mg/L)degradation rate reached 94.4%when photocatalyzed by 30 mg Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2)-5.Superoxide free radicals and hydroxyl free radicals were the main active species in the photocatalytic degradation of RhB by Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2).The Z-type and Schottky double heterojunction formed among AgBr,Ag_(3)PO_(4)and Ti_(3)C_(2)improved the separation efficiency of photogenerated electron-hole pairs(e–-h+)and enhanced the photocatalytic performance of Ag_(3)PO_(4)-AgBr NW/Ti_(3)C_(2).

关 键 词：双异质结 光催化剂 Ti_(3)C_(2) 纳米线 罗丹明B 功能材料 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]