纳米TiO_(2)微球的制备及光催化降解气相苯特性  

Preparation of nano-TiO_(2)microspheres andphotocatalytic degradation of gaseous benzene

作　　者：杜晶晶[1] 赵军伟[1] 施飞[1] 程晓民[1] DU Jingjing;ZHAO Junwei;SHI Fei;CHENG Xiaomin(School of Mechanical Engineering,Ningbo University of Technology,Ningbo 315016,China)

机构地区：[1]宁波工程学院机械工程学院,浙江宁波315016

出　　处：《功能材料》2024年第7期7231-7236,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51275251);宁波“科技创新2025”重大科技专项项目(2022Z047,2022Z071,2023Z032)。

摘　　要：以四氯化钛和尿素为原料,通过溶剂热法制备了纳米TiO_(2)微球。利用XRD、FE-SEM、TEM、UV-Vis、BET测试手段对样品的组成、结构、形貌、光学性能、比表面特性进行分析,以气相苯为目标降解物,研究不同溶剂热时间所制备的微球对光催化活性的影响。结果表明,随溶剂热时间的延长,TiO_(2)微球结构经历了实心-核壳-空心的演变过程,但均由20 nm以下的颗粒组成。此类微球的光吸收带边出现明显“蓝移”现象,且光吸收性能较P25 TiO_(2)要高,比表面积是其3~5倍。其中溶剂热时间为6 h所制备的核壳结构微球光催化活性最佳,降解气相苯的矿化率高达93%,高于P25 TiO_(2)近3倍,分析表明,该优异性能得益于核壳结构对光的充分反射吸收和高比表面积导致的吸附协同光催化特性。The nano-TiO_(2)microspheres were prepared using TiCl 4 and CON 2H 4 as raw materials by a simple solvothermal method.XRD,FESEM,TEM,UV-vis,BET methods were used to directly analyze the composition,structure,morphology,optical properties and specific surface characteristics of the samples.The photocatalytic activity of the microspheres prepared with different solvothermal time was determined by analyzing the degradation of gaseous benzene.The results show that the TiO_(2)microspheres have undergone a process of TiO_(2)solid-core,core-shell and hollow-center structure with the extension of reaction time,but they are all composed of particles below 20 nm.The light absorption band edge of the microspheres exhibits a significant“blue shift”phenomenon,the light absorption performance is higher than P25 TiO_(2),and the specific surface area is 3-5 times higher than that of P25 TiO_(2).The core-shell structure microspheres prepared by 6 h exhibit the highest photocatalytic activity,the mineralization rate of degraded gaseous benzene is as high as 93%,which is nearly three times higher than P25 TiO_(2).The excellent performance may ascribe to the sufficient reflection and absorption of light by the core-shell structure,and the adsorption synergistic photocatalytic properties by the high specific surface area.

关 键 词：纳米TiO_(2)微球 溶剂热法 中空核壳结构 光催化 气相苯 

分 类 号：O649[理学—物理化学]