Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 111-120.doi: 10.13475/j.fzxb.20210501310

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

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 Online:2022-07-15 Published:2022-07-29
  • Contact: ZHANG Hui E-mail:hzhangw532@xpu.edu.cn

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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

CLC Number: 

  • TS151

Fig.1

SEM images of ZIF-8, ZIF-8/Ag/TiO2 heterojunction and PP/ZIF-8/Ag/TiO2composites. (a) ZIF-8(×200 000); (b) ZIF-8/Ag/TiO2(×200 000); (c) PP composite (×5 000); (d) PP composite(×50 000)"

Fig.2

XRD patterns of ZIF-8, ZIF-8/Ag/TiO2 heterojunction and PP/ZIF-8/Ag/TiO2 composites"

Fig.3

TEM images and EDX mappings of ZIF-8/Ag/TiO2 heterojunction. (a) Low-magnificed image; (b)High-magnified image; (c) Element mapping"

Fig.4

N2 adsorption-desorption isotherms and pore size distribution curves.(a)Isotherms of ZIF-8 ;(b)Isotherms of ZIF-8/Ag/TiO2;(c)Pore size distribution curve of ZIF-8; (d)Pore size distribution curve of ZIF-8/Ag/TiO2"

Fig.5

X-ray photoelectron spectra and element contents of ZIF-8, ZIF-8/Ag/TiO2 heterojunction and PP/ZIF-8/Ag/TiO2 composites. (a) Survey; (b) Comparison of atom percent; (c) Spectra of C1s; (d) Spectra of N1s; (e) Spectra of O1s; (f) Spectra of Ti2p; (g) Spectra of Zn2p"

Fig.6

Diffuse reflectance spectra (a), (αhv)2 vs. hv curves (b) and UPS spectra of ZIF-8 (c),ZIF-8/Ag/TiO2 heterojunction (d)"

Fig.7

Thermogrametric and derivative thermogravimetric curves of ZIF-8/Ag/TiO2 heterojunction"

Fig.8

Photodegradation (a) and kinetic fitting curves(b) of Methylene Blue dye by PP mask and PP/ZIF-8/Ag/TiO2 composite under visible light irradiation"

Fig.9

Adsorption comparison for removal of Methylene Bule (a) and Congo Red (b) dyes by ZIF-8, P25, ZIF-8/TiO2 and ZIF-8/Ag/TiO2 heterojunction"

Fig.10

Comparison of recycle photocatalytic degradation of Methylene Blue (a) and Congo Red dyes (b) by ZIF-8,P25, ZIF-8/TiO2 and ZIF-8/Ag/TiO2 heterojunction"

Fig.11

Schematic diagram of photocatalytic degradation mechanism of dye by ZIF-8/Ag/TiO2 heterojunction"

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