水热合成PbTiO3-TiO2微米片复合材料及其光催化降解有机物的应用
Hydrothermal synthesis of PbTiO3-TiO2 microplate composites and their application in photocatalytic degradation of organic matters
张恩榕 1扶勇 1李园春 1尹思敏1
作者信息
- 1. 浙江理工大学机械工程学院,杭州 310018
- 折叠
摘要
为探究钙钛矿氧化物基复合材料的光催化性能,以具有规则暴露面的钙钛矿相PbTiO3微米片为衬底,通过水热法制备了一系列不同负载浓度的钙钛矿相PbTiO3-TiO2微米片复合材料,通过XRD、SEM、BET、XPS和UV-Vis对所制备样品进行了系统的微结构表征及光学特性分析,并测定PbTiO3-TiO2微米片复合材料在不同光源辐照下对30 mg/L罗丹明B(Rh B)水溶液的催化降解性质.结果表明:TiO2单晶颗粒在钙钛矿相PbTiO3微米片表面呈现团聚生长,颗粒尺寸为30～50 nm;随着反应物中钛酸丁醋(TBOT)的增加,钙钛矿相PbTiO3微米片表面生长的TiO2量增多;PbTiO3-TiO2微米片复合材料对RhB水溶液均表现出光催化降解特性,其中以加入0.6 mL TBOT制备的复合材料(S2)催化性能最优,在模拟太阳光辐照下于90 min内对Rh B降解效率可达95.80％,在可见光照射下于180 min内对RhB降解效率为81.86％;PbTiO3-TiO2微米片复合材料的禁带宽度减小,有利于光生载流子的形成,从而有效提高了其光催化性能,也为半导体复合光催化剂的材料设计和性能优化提供了支持.
Abstract
To investigate the photocatalytic performance of perovskite oxide matrix composites,a series of perovskite PbTiO3-TiO2 microplate composites with various loading concentrations were successfully synthesized via the hydrothermal method by employing perovskite PbTiO3 microplates with a regular exposure surface as the substrate.XRD,SEM,BET,XPS and UV-Vis were employed to investigate the microstructure and optical properties of the prepared samples.On the basis,the photocatalytic degradation of the PbTiO3-TiO2 microplate composites to Rh B aqueous solution(30 mg/L)was evaluated under the irradiation of different light sources.The results indicated that single-crystal TiO2 nano-particles with a size of 30-50 nm were growing on the surface of perovskite PbTiO3 microplates in an aggregated manner.In the meanwhile,TiO2 growing on the surface of perovskite PbTiO3 microplates increased with the increase of tetrabutyl orthotitanate(TBOT)employed in the hydrothermal reaction.Furthermore,the as-prepared PbTiO3-TiO2 microplate composites showed remarkable photocatalytic degradation properties towards Rh B aqueous solution.Specifically,the composite sample(S2)prepared with 0.6 mL TBOT exhibited the optimized photocatalytic performances,reaching 95.80％for 90 min under simulated sunlight irradiation,and 81.86％for 180 min under visible light irradiation.In addition,the narrowed band gap of the PbTiO3-TiO2 microplate composites was favorable for the formation of photogenic charge carriers,effectively improving the photocatalytic performance and providing support for material design and performance optimization of semiconductor composite photocatalysts.
关键词
钙钛矿PbTiO3/TiO2/复合材料/光催化/RhB降解Key words
perovskite PbTiO3/TiO2/composites/photocatalysis/degradation of Rh B引用本文复制引用
基金项目
国家自然科学基金(51602286)
浙江省自然科学基金(LY19E020015)
出版年
2024
NETL
NSTL
万方数据