Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (11): 117-123.doi: 10.13475/j.fzxb.20201204207

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Radical-induced crosslinking of poly(vinyl alcohol) from desizing wastewater

SHEN Chensi1, WANG Man1, XU Chenye1, WANG Huaping2, LI Fang1()   

  1. 1. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
    2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
  • Received:2020-12-14 Revised:2021-03-25 Online:2021-11-15 Published:2021-11-29
  • Contact: LI Fang E-mail:lifang@dhu.edu.cn

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Abstract:

The desizing wastewater of the textile printing and dyeing industry contains a large amount of polyvinyl alcohol (PVA) with high polymerization and strong chemical stability, which is a difficult point in the water pollution treatment. Taking advantage of persulfate's ability to initiate free radical crosslinking and strong oxidation, combined with the characteristics of high temperature discharge of desizing wastewater, a thermally activated persulfate system was used to precipitate PVA from wastewater.The effects of persulfate dosage, reaction time, reaction temperature, and pH value on the removal of PVA were investigated.And electron paramagnetic resonance, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to analyze the cross-linked precipitates.The results show that when the dosage of persulfate was 10 g/L and the wastewater temperature was 70 ℃, PVA could be effectively cross-linked and precipitated after 30 minutes, and the removal rate of chemical oxygen demand (COD) and PVA could reach 95.1% and 95.6%,respectively.The production of sulfate radical and hydroxyl radical in thermally activated persulfate system induced the production of carbon-based radicals, and the carbon-based radicals continued to react together and produced the crosslinking product.

Key words: poly(vinyl alcohol), desizing wastewater, radical-induced crosslinking, persulfate, thermal activation

CLC Number: 

  • X703.1

Fig.1

Photo of simulated PVA wastewater during treatment"

Fig.2

Removal rate of PVA and COD of simulated wastewater"

Fig.3

Influencing factors in PVA crosslinking precipitation.(a)Effect of PS dosage; (b)Effect of reaction temperature; (c)Effect of pH value before PS adding; (d) Effect of pH value after PS adding; (e)Effect of Na2SO4 dosage"

Fig.4

FT-IR spectra of PVA before and after crosslinking"

Fig.5

XPS C1s spectra of PVA before and after crosslinking. (a) Initial PVA; (b) PVA precipitates after crosslinking"

Fig.6

XRD spectra of PVA before and after crosslinking"

Fig.7

EPR spectra of themally activated PS system for PVA crosslinking"

Fig.8

Molecular weight distribution of PVA varying with reaction time. (a) Initial PVA; (b)1 min after reaction; (c) 8 min after reaction; (d) 15 min after reaction"

Fig.9

Mechanism diagram of PVA crosslinking-precipitation"

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