Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 98-104.doi: 10.13475/j.fzxb.20180604107

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Decolorization of polyester alcoholysis solution by electrocoagulation

CHEN Xin1,2, ZHANG Jialin1,2, WANG Jidong1,2, LI Xiaoqiang1,2, GE Mingqiao1,2()   

  1. 1. School of Textile and Clothing, Jiangnan University, Wuxi, Jiangsu 214122, China
    2. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2018-06-11 Revised:2019-06-26 Online:2019-10-15 Published:2019-10-23
  • Contact: GE Mingqiao E-mail:ge_mingqiao@126.com

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Abstract:

In order to solve the problem of environmental pollution caused by polyester alcoholysis solution, the electrocoagulation was used to decolorize the solution. An aluminum electrode and a copper electrode were used as the anode and cathode of the electroflocculation reaction system, respectively. The influences of electrolysis voltage, electrolyte concentration, initial pH value and initial dye concentration on the decolorization rate during electroflocculation were studied. The electrodes and flocs were tested, the main decolorization mechanism of the electrocoagulation process was discussed, and the kinetic equation of the decolorization was established. The results show that the optimal process parameters include a voltage of 20 V, an initial pH value of 8, an electrolyte concentration of 0.80 g/L and an initial concentration of 60 mg/L, and the decolorization rate is high than 95% after electrolyzing for 80 min. The electrocoagulation process of polyester alcoholysis solution with an aluminum electrode conforms to the second-order kinetic model.

Key words: waste polyester, alcoholysis solution, electrocoagulation, decolorization rate, polyester recycling and utilization

CLC Number: 

  • TS190.3

Fig.1

Influence of voltage on decolorization"

Fig.2

Influence of electrolyte concentration on decolorization rate"

Fig.3

Influence of initial pH value on decolorization"

Fig.4

Influence of initial dye concentration on decolorization rate"

Fig.5

Surface morphology of anode changes with electrolysis time. (a) Before electrolysis;(b) Electrolysis for 20 min; (c) Electrolysis for 40 min;(d) Electrolysis for 60 min"

Fig.6

Change of particle size of floc with electrolysis time"

Fig.7

Infrared spectra of samples"

Tab.1

Kinetic equation and correlation coefficient"

级数 动力学方程 复相关系数R2
0 y=-0.601 4 x + 39.368 0 0.575 9
1 y=-0.038 6 x + 3.402 0 0.826 5
2 y=0.005 8 x + 0.014 2 0.958 4

Fig.8

Kinetic curve of decolorization process of electrocoagulation"

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