宽光谱响应的介孔rGO/TiO2空心块体制备及光催化性能  

Preparation of mesoporous rGO/TiO2 hollow blocks with wide spectral response and photocatalytic performance related with them

作　　者：李翠霞[1] 史晓 孙会珍 王慧康 康伟超 LI Cui-xia;SHI Xiao;SUN Hui-zhen;WANG Hui-kang;KANG Wei-chao(Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室

出　　处：《兰州理工大学学报》2020年第1期32-36,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(511764039)

摘　　要：以钛酸四丁酯(TBT)、氧化石墨烯(GO)为原料,酵母菌为空腔模板剂,柠檬酸为水解抑制剂和介孔模板剂,采用溶胶-凝胶法原位合成介孔GO/TiO2空心块体材料(GO/TiO2),通过紫外灯辐照还原得到rGO/TiO2.利用XRD、SEM、BET、PL表征手段对样品进行分析,研究酵母菌的引入对rGO/TiO 2降解盐酸四环素性能的影响.结果表明:样品为介孔空心块体结构,其比表面积为50.66 m 2/g,以4.3 nm的介孔为主;酵母菌的加入可抑制催化剂光生电子-空穴对的复合,并拓宽其光谱响应范围,提高光催化性能;当酵母菌质量分数为5%时,rGO/TiO2的催化性能达到最佳水平,在可见光及紫外光条件下,盐酸四环素的降解率分别达到84.97%、96.96%.Mesoporous graphene oxide/TiO2 hollow bulk materials were synthesized in-situ with Sol-Gel method,by taking tetrabutyl titanate(TBT)and graphene oxide(GO)as raw materials,yeast as cavity template agent and citric acid as hydrolysis inhibitor and mesoporous template agent,and then the reduced graphene oxide/TiO2(rGO/TiO2)bulk materials were obtained by means of ultraviolet radiation reduction.The samples were analyzed by means of various characterization means such as X-ray diffraction(XRD),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)and photoluminescence(PL)and the effect of yeast addition on degradation of tetracycline hydrochloride with rGO/TiO2 was studied.It was shown by experimental result that rGO/TiO2 would be mesoporous bulk materials with specific surface area of 50.66 m 2/g and mesopores size of 4.3 nm in majority.The addition of yeast could effectively inhibit the recombination of the photo-generated electron-hole pair of catalyst,broaden the spectral response range and improve the photocatalytic performance.When the mass fraction of yeast was 5%,the catalytic performance of rGO/TiO2 would reach optimal level.Under visible light and ultraviolet light,the degradation rate of tetracycline hydrochloride would reach 84.97%and 96.96%,respectively.

关 键 词：还原氧化石墨烯 TIO2 酵母菌 空心块体 光催化性能 

分 类 号：TB34[一般工业技术—材料科学与工程]