鸟巢状Bi/β-Bi_(2)O_(3)异质结的制备及其可见光催化性能  

Sodium Gluconate Assisted Synthesis of Nest-like Bi/β-Bi_(2)O_(3)Heterojunction and Its Visible-light Driven Photocatalytic Activities

作　　者：周慧[1] 杜彬[1] 杨鹏斌 金党琴[1] 肖伽励 沈明[2] 王升文[1] ZHOU Hui;DU Bin;YANG Pengbin;JIN Dangqin;XIAO Jiali;SHEN Ming;WANG Shengwen(School of Chemical Engineering,Yangzhou Polytechnic Institute,Yangzhou 225127,China;College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China)

机构地区：[1]扬州工业职业技术学院化学工程学院,扬州225127 [2]扬州大学化学化工学院,扬州225002

出　　处：《材料研究学报》2024年第7期549-560,共12页Chinese Journal of Materials Research

基　　金：国家自然科学基金(21673201);江苏省高等学校自然科学研究项目(22KJB156);扬州市科技计划项目(YZ2022081);扬州市科技计划项目(YZ2022196);扬州工业职业技术学院自然科学类重点课题(2021xjzk004)。

摘　　要：在葡萄糖酸钠的辅助下用水热法制备鸟巢状含铋前驱体,研究了水热温度和反应物的浓度对其形貌和组成的影响及其生成机理。在150~400℃将前驱体煅烧制备出Bi/β-Bi_(2)O_(3)异质结分等级微纳结构。将前驱体煅烧使其分解生成Bi_(2)O_(3),葡萄糖酸生成的碳将Bi^(3+)原位还原为单质Bi。煅烧过程中的相变为:前驱体→Bi/β-Bi_(2)O_(3)(150~280℃)→Bi/β-Bi_(2)O_(3)/α-Bi_(2)O_(3)(300~350℃)→Bi(400℃)。以盐酸左氧氟沙星(LVFH)的降解为探针反应,研究了样品的可见光催化性能。结果表明:在280℃将前驱体煅烧制备的鸟巢状Bi/β-Bi_(2)O_(3)异质结材料具有最好的可见光催化活性,用可见光照射140 min对LVFH降解率达到97.75%。其具有较优异的光催化性能,可归因于鸟巢状分等级结构和原位生成的Bi纳米粒子的SPR效应提高了可见光的吸收并促进了光生载流子的分离。这种Bi/β-Bi_(2)O_(3)异质结光催化剂,还具有良好的可循环使用性能。The nest-like bismuth-containing precursor was prepared by hydrothermal method with sodium gluconate as auxiliaries.The effect of the hydrothermal temperature and reactant concentration on the morphology and composition of the prepared precursor were systematically studied,and the formation mechanism of the precursor was elucidated.Then,calcination of the precursor was carried out at 150℃~400℃,during which the precursor decomposed to Bi_(2)O_(3).At the same time,the carbon generated by high-temperature carbonization of the gluconic acid involved in the skeleton of the precursor can in situ reduce Bi^(3+)to Bi nanoparticles.The phase transition during calcination process can be described as:precursor→Bi/β-Bi_(2)O_(3)(150℃~280℃)→Bi/β-Bi_(2)O_(3)/α-Bi_(2)O_(3)(300℃~350℃)→Bi(400℃).The degradation of levofloxacin hydrochloride(LVFH)was used as a probe to evaluate the visible-light photocatalytic performance of the as-prepared Bi/β-Bi_(2)O_(3)heterojunctions.Among others,the Bi/β-Bi_(2)O_(3)heterojunction obtained at 280℃ exhibited the best visible-light photocatalytic activity,and the degradation rate of LVFH can reach 97.75%after 140 min of visible-light irradiation.Its superior photocatalytic performance was attributed to the nest-like hierarchical structure and the SPR effect of the in situ generated Bi-nanoparticles,which improved visible-light harvesting and promoted the separation of photogenerated carriers.In addition,the Bi/β-Bi_(2)O_(3)heterojunction photocatalyst showed good recyclable and reusable performance.

关 键 词：复合材料 Bi/β-Bi_(2)O_(3) 可见光催化 葡萄糖酸钠 异质结 盐酸左氧氟沙星 

分 类 号：O643.36[理学—物理化学]