玻纤负载TiO_(2)/g-C_(3)N_(4)光催化膜的制备及降解染料性能  

Fabrication and dye degradation performances of glass fiber supported TiO_(2)/g-C_(3)N_(4) catalyst film

作　　者：高海燕[1,2,3] 安仁德 赵永男[1,2] GAO Haiyan;AN Rende;ZHAO Yongnan(Tianjin Key Laboratory of Advanced Fibers and Energy Storage Technology,Tiangong University,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Key Laboratory of Advanced Energy Materials Chemistry,Ministry of Education,Nankai University,Tianjin 300071,China)

机构地区：[1]天津工业大学天津市先进纤维与储能技术重点实验室,天津300387 [2]天津工业大学材料科学与工程学院,天津300387 [3]南开大学先进能源材料化学教育部重点实验室,天津300071

出　　处：《天津工业大学学报》2023年第6期47-53,共7页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(21703152);天津市教委科研计划项目(自然科学)(2018KJ197);南开大学先进能源材料化学教育部重点实验室开放课题。

摘　　要：为解决光催化剂效率不高、粉末难回收且易造成二次污染等问题,采用浸渍法制备了玻璃纤维负载TiO_(2)/gC_(3)N_(4)光催化膜(命名为TCNGF)。TiO_(2)和g-C_(3)N_(4)纳米颗粒通过静电自组装在玻璃纤维表面形成了均匀无裂痕的薄膜,重量法测得催化剂负载量(质量分数)为4%。降解实验结果表明:以TCNGF为催化剂,在模拟太阳光下,10 mg/L的罗丹明B(RhB)溶液在40 min的降解率达到98%,4次循环降解实验的脱色降解率均高于99%,且溶液中无絮状沉淀产生,表明催化剂优异的催化活性、附着牢度和循环稳定性。催化结果表明:适量提高TiO_(2)和g-C_(3)N_(4)的质量比,催化膜内异质结量增多,促使光生活性自由基增多,染料降解速率增快;初始染料浓度对TCNGF光催化降解性能无明显影响。自由基捕获实验证明:超氧自由基(·O_(2)~-)和羟基自由基(·OH)在光催化反应过程中为主要活性物种;光催化反应机理研究表明,TCNGF属于Z型光催化体系。In order to solve the problems of low catalytic efficiency,the unrecyclability and possible secondary pollution of powder photocatalysts,glass fiber-supported TiO_(2)/g-C_(3)N_(4) catalyst film(denoted as TCNGF)was fabricated by impregnation method.Homogeneous crack-free film formed on the glass fiber by self-assembled TiO_(2) and g-C_(3)N_(4) nanoparticles through electrostatic interaction.Gravimetric determination gave the catalyst loading content of 4%.The degradation experiments show that using TCNGF as the catalyst under mimic sunlight,the degradation rate of 10 mg/L RhB solution reaches 98%within 40 min.The degradation rates of four-cycle degradation reactions are all higher than 99%without any flocculent precipitation in the solution.These results reveale the high catalytic efficiency,excellent adhesion fastness and cycling stability of the catalyst.The catalytic results also demonstrate that increasing the mass ratio of TiO_(2):g-C_(3)N_(4) within a certain range elevate the amount of heterojunction to augment the photo-induced active free radicals and accelerate the dye degradation rate.The initial dye concentration has no detectable effect on the photocatalytic degradation performance of TCNGF.Free radical capture experiments have proved that superoxide radicals(·O_(2)-)and hydroxyl radicals(·OH)are the main active species in the photocatalytic reaction process,and the study of the photocatalytic reaction mechanism has shown that TCNGF belongs to the Z-type photocatalytic system.

关 键 词：浸渍法 TiO_(2) g-C_(3)N_(4) 玻璃纤维 光催化剂 染料降解 光催化膜 

分 类 号：TB383[一般工业技术—材料科学与工程] O643.36[理学—物理化学]