纺织学报 ›› 2022, Vol. 43 ›› Issue (07): 111-120.doi: 10.13475/j.fzxb.20210501310

• 染整与化学品 • 上一篇    下一篇

废弃口罩基ZIF-8/Ag/TiO2复合材料的制备及其光催化降解染料性能

张雅宁1,2,3, 张辉1,2,3(), 宋悦悦1,2,3, 李文明1,2,3, 李雯君1,2,3, 姚佳乐1,2,3   

  1. 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
  • 收稿日期:2021-05-07 修回日期:2022-04-13 出版日期:2022-07-15 发布日期:2022-07-29
  • 通讯作者: 张辉
  • 作者简介:张雅宁(1998—),女,硕士生。主要研究方向为纺织固体废弃物回收再利用研究。
  • 基金资助:
    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)

Preparation of discarded mask-based ZIF-8/Ag/TiO2 composite and its photocatalytic property for dye degradation

ZHANG Yaning1,2,3, ZHANG Hui1,2,3(), SONG Yueyue1,2,3, LI Wenming1,2,3, LI Wenjun1,2,3, YAO Jiale1,2,3   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Research Centre for Functional Textile Materials, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    3. State Key Laboratory of Intelligent Textile Material and Products, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
  • Received:2021-05-07 Revised:2022-04-13 Published:2022-07-15 Online:2022-07-29
  • Contact: ZHANG Hui

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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/TiO2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/TiO2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/TiO2,ZIF-8/Ag/TiO2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TiO2使得ZIF-8/Ag/TiO2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。

关键词: 废弃口罩, ZIF-8/Ag/TiO2异质结, 吸附, 光催化降解, 染料, 印染废水, 废水处理

Abstract:

Aiming to use discarded masks for purifying printing and dyeing wastewater, ZIF-8/Ag/TiO2 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/TiO2 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/TiO2 composite were improved by 12.9 and 4.8 times respectively with good reusability. ZIF-8/Ag/TiO2 heterojunction exhibited stronger adsorption capacity and visible light photocatalytic activity as compared with ZIF-8 and ZIF-8/TiO2. The band-gap of ZIF-8/Ag/TiO2 was narrowed due to the doping of Ag into ZIF-8/ZnO and the doping of C and N into TiO2. In addition, the hollow-structured ZIF-8/Ag/TiO2 with holes could absorb more visible lights.

Key words: discarded mask, ZIF-8/Ag/TiO2 heterojunction, adsorption, photocatalytic degradation, dye, printing and dyeing wastewater, waste water treatment

中图分类号: 

  • TS151

图1

ZIF-8、ZIF-8/Ag/TiO2和PP/ZIF-8/Ag/TiO2的扫描电镜照片"

图2

ZIF-8、ZIF-8/Ag/TiO2和口罩复合材料的X射线衍射谱图"

图3

ZIF-8/Ag/TiO2异质结透射电镜照片和元素面扫描谱图"

图4

ZIF-8和ZIF-8/Ag/TiO2异质结的氮气吸附-解吸等温线和孔径分布曲线"

图5

ZIF-8、ZIF-8/Ag/TiO2异质结和PP/ZIF-8/Ag/TiO2X射线光电子能谱总谱和窄谱图及其原子百分比结果"

图6

ZIF-8、ZIF-8/Ag/TiO2异质结和PP/ZIF-8/Ag/TiO2漫反射光谱图与(αhv)2与hv关系图以及ZIF-8和 ZIF-8/Ag/TiO2异质结的紫外光电子谱图"

图7

ZIF-8/Ag/TiO2异质结热失重和微商热重曲线"

图8

PP口罩和PP/ZIF-8/Ag/TiO2吸附和可见光辐照光催化降解亚甲基蓝染料降解曲线和动力学拟合曲线"

图9

ZIF-8、P25、ZIF-8/TiO2和ZIF-8/Ag/TiO2异质结重复性吸附亚甲基蓝和刚果红染料结果"

图10

ZIF-8、P25、ZIF-8/TiO2和ZIF-8/Ag/TiO2异质结重复光催化降解亚甲基蓝和刚果红染料结果"

图11

ZIF-8/Ag/TiO2异质结光催化分解染料反应原理图"

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