Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 103-110.doi: 10.13475/j.fzxb.20201200708

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Mechanism and performance of TiO2 composite photocatalysts for photo-degradation of methyl-orange in highly saline wastewater

SHI Minhui, LI Bingrui, WANG Ting(), WU Liguang   

  1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310012, China
  • Received:2020-12-03 Revised:2021-09-04 Online:2021-12-15 Published:2021-12-29
  • Contact: WANG Ting E-mail:zjwtwaiting@hotmail.com

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Abstract:

To deeply understand the effect of salt ions on the degradation of organic pollutants by using TiO2-based photocatalysts, the photo-degradation mechanism for methyl-orange in high saline wastewater systems irradiated by visible light was explored, via the addition of holes and free radical traps. The results show that the photo-generated holes formed by the catalyst plays a key role on the degradation for organic pollutants. In the high saline wastewater system, salt ions mainly interferes with the photocatalytic reaction in the bulk phase. When large amount of the organic pollutants are adsorbed on the catalyst surface, the presence of salt ions in the bulk phase has little interference with the photocatalytic reaction, and the increase of Ti3+ content in the catalyst after ethylene glycol thermal reduction treatment improves both the visible light response and the catalyst activity. A small amount of ethylene glycol grafted on the surface of reduced graphene oxide promotes the adsorption of methyl-orange on the catalyst surface, thereby more effectively resisting the interference of salt ions.

Key words: visible light-excited photocatalytic degradation, TiO2-based photocatalyst, highly saline wastewater, methyl-orange, photo-degradation mechanism, wastewater treatment, printing and dying wastewater treatment

CLC Number: 

  • O647

Fig.1

Effect of addition of different scavengers on catalytic photo-degradation irradiated by visible light in pure water and highly saline wastewater. (a) Pure water; (b) 0.2 mol/L Na2SO4 aqueous solution; (c) 0.5 mol/L Na2SO4 aqueous solution"

Tab.1

Effect of addition of different scavengers on 5 h removal rate for methyl-orange by catalyst in highly saline wastewater"

废水体系 R5/%
无捕
获剂		 · O 2 -捕获剂
(对苯醌)		 ·OH捕获剂
(叔丁醇)		 空穴捕获剂
(EDTA二钠)
纯水 91 86 70 48
0.2 mol/L硫酸钠 83 88 72 41
0.5 mol/L 硫酸钠 81 86 69 49

Fig.2

Photo-degradation mechanism for methyl-orange by Yb-TiO2-RGO irradiated by visible light"

Tab.2

XPS fitting results of different Yb-TiO2-RGO catalysts treated by alcohol or PEG solvo-reduction"

催化剂 Ti2p O1s
Ti3+ Ti4+ 晶格氧 表面氧 吸附氧 C—O
Yb-TiO2-RGO 8.6 91.4 11.5 18.4 27.0 43.1
Yb-TiO2-RGO-160 10.2 89.8 12.1 21.6 28.1 38.2
Yb-TiO2-RGO-170 14.7 85.3 11.8 23.7 27.8 36.7
Yb-TiO2-RGO-180 9.2 90.8 13.6 25.8 23.1 37.5

Fig.3

Effect of scavengers' addition on removal rate for methyl-orange in differnet highly saline wastewater"

Fig.4

Photodegradation for methyl-orange with different concentration in pure water and high saline waste water. (a) Pure water; (b) 0.5 mol/L Na2SO4 aqueous solution"

Fig.5

XRD patterns of different Yb-TiO2-RGO catalysts treated by alcohol or PEG solvo-reduction"

Fig.6

FT-IR spectra of different Yb-TiO2-RGO catalysts treated by alcohol or PEG solvo-reduction"

Fig.7

TEM images of different Yb-TiO2-RGO catalysts treated by PEG solvo-reduction"

Fig.8

XPS profiles of Ti2p in different Yb-TiO2-RGO catalysts treated by PEG solvo-reduction"

Fig.9

XPS profiles of O1s in different Yb-TiO2-RGO catalysts treated by PEG solvo-reduction"

Fig.10

Photocurrent of different Yb-TiO2-RGO catalysts treated by alcohol or PEG solvo-reduction"

Fig.11

Photodegradation for methyl-orange of different catalysts treated by alcohol and PEG irradiated in visible light. (a) Pure water; (b) 0.5 mol/L Na2SO4 aqueous solution"

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