三维乒乓菊状CdS/BiOBr催化剂的制备及其光催化降解罗丹明B  

Preparation of three-dimensional ping-pong chrysanthemum-like CdS/BiOBr composite and its application on photocatalytic degradation of Rhodamine B

作　　者：李红颖 徐毅 杨帆[1,2] 任瑞鹏 周全[1,2] 吴丽杰 吕永康 LI Hongying;XU Yi;YANG Fan;REN Ruipeng;ZHOU Quan;WU Lijie;LV Yongkang(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan,Shanxi030024,China;College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan,Shanxi030024,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学化学工程与技术学院,山西太原030024

出　　处：《纺织学报》2023年第9期124-133,共10页Journal of Textile Research

基　　金：国家自然科学基金项目(21776196,51778397);山西省应用基础研究计划项目(20210302124431)。

摘　　要：为提升BiOBr的光催化性能,通过两步法合成了三维乒乓菊状CdS/BiOBr催化剂。首先利用溶剂热法制备了BiOBr纳米片,接着采用水热法直接在层状BiOBr表面生长CdS粒子制备了CdS/BiOBr催化剂,并通过调整CdS与BiOBr的量比来调控催化剂的形貌。对制备的CdS/BiOBr催化剂的结构、形貌、光学性能等进行了表征分析,考察了其在可见光下对罗丹明B(RhB)的降解效果和稳定性,通过活性物种捕获实验和电子自旋共振测试分析确定了降解过程中的主要活性物质。结果表明:当CdS与BiOBr的量比为1∶3时,二者发生规则组合,形成独特的三维乒乓菊状层级结构;该催化剂有优异的光催化性能和稳定性,在可见光照射下120 min降解了99.5%的RhB,一级动力学常数为0.044 min^(-1),是纯BiOBr的3.67倍,经过7次光催化循环后仍保留了90.1%的催化活性;·O_(2)^(-)和h^(+)在RhB降解过程中发挥了主要作用,结合CdS和BiOBr的带隙结构提出了一种可能的光催化降解途径。Objective The energy crisis and environmental pollution are the two major tests facing mankind.Nitrogen-containing dyes with chromophores have stable chemical properties,which can darken the color of water bodies and affect the light transmission and are hazardous in causing genetic mutations.BiOBr has a good visible light response,but its forbidden band width is slightly larger,the visible light utilization is low,and the photogenerated carriers are prone to compounding.The combination of CdS and BiOBr is believed to have the capacity for the effective separation of electrons and holes to increase the visible light utilization to improve the photocatalytic performance.Method BiOBr nanosheets were prepared by the solvothermal method,followed by the preparation of the CdS/BiOBr composites by growing CdS particles directly on the layered BiOBr surface by the hydrothermal method,where the morphology of the composite catalysts was adjusted by adjusting the molar ratio of the two.The prepared photocatalysts were characterized by transmission electron microscope(TEM),X-ray diffraction(XRD),UV-Vis DRS,etc.,and the degradation effect and stability of the catalysts on Rhodamine B(RhB)were investigated by visible light catalysis experiments.The main active substances in the degradation process were identified by active species capture experiments.Results When the molar ratio of CdS to BiOBr was 1∶3,the catalyst CdS/BiOBr(1∶3)morphology showed a three-dimensional ping-pong chrysanthemum-like hierarchical structure,and the CdS nanoparticles were uniformly distributed on the surface of BiOBr petal-like flakes(Fig.2(e)and(f)).Peaks associated with Bi,Br,O,Cd and S were observed in the EDS spectrum,confirming the presence of these six elements in the composite(Fig.3(a)),the successful formation of heterojunction between CdS and BiOBr was confirmed by the analysis of TEM(Fig.3(b)and(c)),and the XRD spectrum indicated that the CdS/BiOBr composite was successfully prepared with high purity(Fig.4).The catalyst CdS/BiOBr(1∶3)s

关 键 词：光催化 印染废水处理 罗丹明B 水热法 降解机制 BiOBr CDS 

分 类 号：O643[理学—物理化学]