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Decolorization and reusing of PET depolymerization waste liquid by electrochemical method with magnetic
Mengjuan Li1,2, Yanyan Li3, Jing Lu3
1Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, Jiangsu, China. mjjn@jiangnan.edu.cn.
Environmental Science and Pollution Research International
|October 13, 2018
Summary
Electrochemical decolorization using chitosan/Fe3O4 nanoparticles effectively removed dyes from PET waste liquid. This process enabled the recovery of purified bis(2-hydroxyethyl) terephthalate (BHET) through depolymerization.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Chemistry
Background:
- Polyethylene terephthalate (PET) depolymerization generates colored waste liquid.
- Recycling PET requires efficient methods for waste stream treatment and monomer recovery.
Purpose of the Study:
- To develop an electrochemical method for decolorizing PET waste liquid.
- To investigate the use of chitosan/Fe3O4 nanoparticles as dispersed electrodes.
- To assess the impact of decolorization on subsequent bis(2-hydroxyethyl) terephthalate (BHET) recovery.
Main Methods:
- Glycolysis of PET fabrics with ethylene glycol (EG).
- Purification of glycolysis product to obtain bis(2-hydroxyethyl) terephthalate (BHET).
- Electrochemical decolorization of waste liquid using chitosan/Fe3O4 nanoparticles under DC voltage.
Main Results:
- UV-Vis absorption peaks corresponding to dyes decreased significantly during electrolysis.
- Maximum color removal efficiency reached 87.24%.
- BHET yields of 72.3% and 76.6% were achieved using decolorized waste liquid for depolymerization.
Conclusions:
- Electrochemical decolorization is a viable method for treating PET waste liquid.
- Chitosan/Fe3O4 nanoparticles are effective dispersed electrodes for dye removal.
- Decolorized waste liquid facilitates the production of high-purity BHET.
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