Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 107-113.doi: 10.13475/j.fzxb.20200701307

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of Ag6Si2O7/TiO2 photocatalyst and its photocatalytic degradation of methylene blue

JIANG Wenwen1,2, MO Huilin1,2, FAN Tingyue1,2, ZHAO Ziyao1,2, REN Yu1,2(), WANG Chunxia1,3, ZHANG Wei1,2, ZANG Chuanfeng1,2   

  1. 1. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
    2. National & Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Health, Nantong, Jiangsu 226019, China
    3. College of Textiles and Clothing, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China
  • Received:2020-07-06 Revised:2021-01-07 Online:2021-04-15 Published:2021-04-20
  • Contact: REN Yu E-mail:ren.y@ntu.edu.cn

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Abstract:

In order to prepare visible light catalyst with stable performance, a novel highly efficient Ag6Si2O7/TiO2 photocatalyst was prepared by an in-situ deposition method.The surface morphology, crystalline structure, chemical elemental composition and fluorescence spectrum of the photocatalyst were analyzed. The photocatalytic activity of the composite catalyst with different concentration of TiO2 were tested by degrading methylene blue (MB) under simulated visible light at room temperature. The results show that Ag6Si2O7 are coated on TiO2 uniformly, Ag6Si2O7 and TiO2 are tightly bonded in the form of core-shell structure, and Ag+, Si4+and Ti4+ exist in composite catalyst. The results of photocatalytic degradation of MB show that the Ag6Si2O7/TiO2 photocatalyst exhibits higher photocatalytic activity under visible light than Ag6Si2O7 and TiO2 used separately. When the mass fraction of TiO2 is 20%, the photocatalyst possesses the highest photocatalytic activity. The degradation efficiency for MB is up to 98.6% after irradiating in simulated solar for 20 min. The novel high-efficiency Ag6Si2O7/TiO2 photocatalyst has a broad application prospect in treatment of printing and dyeing wastewater.

Key words: TiO2, photocatalyst, dye degradation, methylene blue, printing and dyeing wastewater treatment

CLC Number: 

  • O643.36

Fig.1

Formation of Ag6Si2O7/TiO2"

Fig.2

SEM images of photocatalysts"

Fig.3

XRD patterns of photocatalysts"

Fig.4

XPS spectra of Ag6Si2O7/TiO2. (a)Ag6Si2O7/TiO2 wide spectrum; (b)Ti2p spectrum; (c)Ag3d spectrum; (d)Si2p spectrum"

Fig.5

FT-IR spectra of photocatalysts"

Fig.6

Photoluminescence spectra of photocatalysts"

Fig.7

Photocatalytic activity of samples under simulated visible light irradiation"

Tab.1

Ag6Si2O7/TiO2degradation efficiency of methylene blue under different capture agents"

捕获剂 空白样 EDTA-2Na IPA BQ
降解率/% 98.6 36.8 91.6 76.3

Fig.8

Photocatalytic mechanisms of photo-generated carriers transfer under visible light before (a) and after (b) combination"

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