α-堇青石/TiO_(2)复合材料的制备及吸附-光催化性能研究  

Synthesis and adsorption-photocatalytic property ofα-cordierite/TiO_(2)composite

作　　者：陈佩 吴尔豪 刘晓文[1] CHEN Pei;WU Erhao;LIU Xiaowen(School of Minerals Processing and Bioengineering,Central South University,Changsha,410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《功能材料》2025年第4期4171-4179,共9页Journal of Functional Materials

基　　金：中南大学中央高校基金项目(2022ZZTS0500)。

摘　　要：利用水热-焙烧法制备TiO_(2)纳米片,采用水热-煅烧法制备α-堇青石,并以α-堇青石和钛酸四丁酯(TBOT)为前驱体,通过水热-焙烧法合成α-堇青石/TiO_(2)复合材料。利用XRD、SEM、BET、FT-IR、XPS、UV-Vis等对材料进行表征,研究其对亚甲基蓝(MB)溶液的吸附与降解性能。结果表明,复合材料中TiO_(2)为锐钛矿相,α-堇青石的引入未改变TiO_(2)晶体结构,但显著提高了比表面积(由59.1 m^(2)/g增至255.8 m^(2)/g),改善了TiO_(2)的团聚现象,增加了表面羟基、氧空位和介孔。α-堇青石使TiO_(2)吸收带蓝移,禁带宽度由3.27 eV降至3.19 eV。复合材料在120 min黑暗条件下对10 mg/L MB的吸附率达92.3%,分别是纯TiO_(2)和α-堇青石的61倍和8.2倍;在30 W紫外灯下照射60 min,其对MB的光降解率达100%,是纯TiO_(2)的2.5倍。经过5次循环使用,降解率仍达95.2%,表现出优异的稳定性。自由基捕获实验表明,羟基自由基(·OH)是光降解的主要活性物种。本研究为废水中染料的去除提供了一种高效的处理方法。TiO_(2)nanosheets were synthesized via a hydrothermal method,whileα-cordierite was prepared using a hydrothermal-high-temperature calcination process.Theα-cordierite/TiO_(2)composite material was synthesized by hydrothermally combiningα-cordierite and tetrabutyl orthotitanate(TBOT)as precursors.The synthesized products were characterized by XRD,SEM,BET,FT-IR,XPS,and UV-vis.The adsorption and degradation properties of the three materials on methylene blue(MB)solution were investigated.The results revealed that TiO_(2)in the composite existed in the anatase phase,and the crystal structure of TiO_(2)was not altered by the introduction ofα-cordierite.The specific surface area increased from 59.1 m^(2)/g to 255.8 m^(2)/g,significantly improving the aggregation of TiO_(2).The surface hydroxyl groups,oxygen vacancies,and mesopores were also enhanced.The incorporation ofα-cordierite resulted in a blue shift in the absorption band of TiO_(2),and the bandgap of TiO_(2)decreased from 3.27 eV to 3.19 eV.Under dark conditions for 120 minutes,the composite material exhibited an MB adsorption rate of 92.3%for 10 mg/L MB,which was 61 times and 8.2 times higher than that of pure TiO_(2)andα-cordierite,respectively.Under 30 W UV light irradiation for 60 minutes,the composite achieved a 100%photodegradation rate of MB,which was 2.5 times higher than pure TiO_(2).Theα-cordierite/TiO_(2)composite demonstrated excellent cyclic stability,with a 95.2%degradation rate of MB after five consecutive photocatalytic cycles.Hydroxyl radicals(·OH)were identified as the dominant reactive species in the photodegradation process ofα-cordierite/TiO_(2).This study provides an efficient method for dye removal in wastewater treatment.

关 键 词：α-堇青石/TiO_(2) 核-壳结构 吸附 光催化降解 

分 类 号：TB332[一般工业技术—材料科学与工程]