废弃口罩基ZIF-8/Ag/TiO_(2)复合材料的制备及其光催化降解染料性能  

Preparation of discarded mask-based ZIF-8/Ag/TiO_(2) composite and its photocatalytic property for dye degradation

作　　者：张雅宁 张辉 宋悦悦[1,2,3] 李文明 李雯君 姚佳乐[1,2,3] ZHANG Yaning;ZHANG Hui;SONG Yueyue;LI Wenming;LI Wenjun;YAO Jiale(School of Textile Science and Engineering, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China;Research Centre for Functional Textile Materials, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China;State Key Laboratory of Intelligent Textile Material and Products, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China)

机构地区：[1]西安工程大学纺织科学与工程学院,陕西西安710048 [2]西安工程大学功能纺织材料研究中心,陕西西安710048 [3]西安工程大学省部共建智能纺织材料与制品国家重点实验室(培育),陕西西安710048

出　　处：《纺织学报》2022年第7期111-120,共10页Journal of Textile Research

基　　金：大学生创新创业训练计划项目(S202010709035);陕西省国际科技合作计划项目(2020KW-069);国家自然科学基金面上项目(51873169)。

摘　　要：针对废弃口罩和印染废水处理难题,利用金属有机骨架ZIF-8高度可调的孔径、大的比表面积、优异的吸附和光催化活性,基于化学共沉淀法和煅烧技术制备出ZIF-8/Ag/TiO_(2)异质结,并将其负载到废弃的口罩上。对颗粒物和口罩复合材料的形貌、结构、比表面积、键合状态、能带结构和热稳定性进行了分析,测定了吸附、光催化降解亚甲基蓝和刚果红染料性能。研究结果表明:较原始口罩,废弃口罩基ZIF-8/Ag/TiO_(2)复合材料的吸附、可见光光催化降解亚甲基蓝染料能力分别提高了12.9倍和4.8倍,且可多次重复使用;较ZIF-8和ZIF-8/TiO_(2),ZIF-8/Ag/TiO_(2)异质结吸附能力和可见光光催化活性增强。Ag掺杂ZIF-8/ZnO与C、N掺杂TiO_(2)使得ZIF-8/Ag/TiO_(2)异质结带隙变窄,且有孔的中空结构能够更加充分地吸收可见光。Aiming to use discarded masks for purifying printing and dyeing wastewater,ZIF-8/Ag/TiO_(2) heterojunction was prepared based on the chemical co-precipitation and calcination methods using metal organic framework ZIF-8 as the supporting material,making use of the characteristics of ZIF-8 being highly adjustable pore size,large specific surface area,excellent adsorption capability,and high photocatalytic activity.The synthesized ZIF-8/Ag/TiO_(2) particles were loaded on the surface of discarded mask.The morphology,structure,specific surface area,chemical bonding state,electronic energy band structure,and thermal stability of the resultant particles and mask-based composite were systemically characterized.The properties of adsorption and visible light photocatalytic degradation of methylene blue and Congo Red dyes were investigated.Experimental results indicated that in comparison with the untreated mask,the adsorption and photocatalytic degradation capabilities towards methylene blue by the mask-ZIF-8/Ag/TiO_(2) composite were improved by 12.9 and 4.8 times respectively with good reusability.ZIF-8/Ag/TiO_(2) heterojunction exhibited stronger adsorption capacity and visible light photocatalytic activity as compared with ZIF-8 and ZIF-8/TiO_(2).The band-gap of ZIF-8/Ag/TiO_(2) was narrowed due to the doping of Ag into ZIF-8/ZnO and the doping of C and N into TiO_(2).In addition,the hollow-structured ZIF-8/Ag/TiO_(2) with holes could absorb more visible lights.

关 键 词：废弃口罩 ZIF-8/Ag/TiO_(2)异质结 吸附 光催化降解 染料 印染废水 废水处理 

分 类 号：TS151[轻工技术与工程—纺织材料与纺织品设计]