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鸟巢状Bi/β-Bi2O3异质结的制备及其可见光催化性能

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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-Bi2O3异质结分等级微纳结构.将前驱体煅烧使其分解生成Bi2O3,葡萄糖酸生成的碳将Bi3+原位还原为单质Bi.煅烧过程中的相变为:前驱体→Bi/β-Bi2O3(150～280℃)→Bi/β-Bi2O3/α-Bi2O3(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-Bi2O3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-Bi2O3异质结光催化剂,还具有良好的可循环使用性能.
Sodium Gluconate Assisted Synthesis of Nest-like Bi/β-Bi2O3 Heterojunction and Its Visible-light Driven Photocatalytic Activities
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 for-mation mechanism of the precursor was elucidated.Then,calcination of the precursor was carried out at 150℃～400℃,during which the precursor decomposed to Bi2O3.At the same time,the carbon generated by high-temperature carbonization of the gluconic acid involved in the skeleton of the precursor can in si-tu reduce Bi3+to Bi nanoparticles.The phase transition during calcination process can be described as:precursor→Bi/β-Bi2O3(150℃～280℃)→Bi/β-Bi2O3/α-Bi2O3(300℃～350℃)→Bi(400℃).The degradation of levofloxacin hydrochloride(LVFH)was used as a probe to evaluate the visible-light photocatalytic perfor-mance of the as-prepared Bi/β-Bi2O3 heterojunctions.Among others,the Bi/β-Bi2O3 heterojunction ob-tained 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 at-tributed 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 addi-tion,the Bi/β-Bi2O3 heterojunction photocatalyst showed good recyclable and reusable performance.

compositeBi/β-Bi2O3visible-light photocatalysissodium gluconateheterojunctionle-vofloxacin hydrochloride

周慧、杜彬、杨鹏斌、金党琴、肖伽励、沈明、王升文

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扬州工业职业技术学院化学工程学院 扬州 225127

扬州大学化学化工学院 扬州 225002

复合材料 Bi/β-Bi2O 可见光催化 葡萄糖酸钠 异质结 盐酸左氧氟沙星

国家自然科学基金江苏省高等学校自然科学研究项目扬州市科技计划项目扬州市科技计划项目扬州工业职业技术学院自然科学类重点课题Science and Technology Project of Yangzhou

2167320122KJB156YZ2022081YZ20221962021xjzk004YZ2022081 & YZ2022196

2024

10.11901/1005.3093.2023.430

材料研究学报
国家自然科学基金委员会 中国材料研究学会

材料研究学报

CSTPCD北大核心
影响因子：0.605
ISSN：1005-3093
年,卷(期)：2024.38(7)
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