Unlocking a Sustainable Future for Plastics: A Chemical-Enzymatic Pathway for Efficient Conversion of Mixed Waste to MHET and Energy-Saving PET Recycling

被引：1

作者：

Li, Anni ^{[1
]}

Wu, Luxuan ^{[1
]}

Cui, Haiyang ^{[2
]}

Song, Yibo ^{[1
]}

Zhang, Xing ^{[1
]}

Li, Xiujuan ^{[1
]}

机构：

[1] Nanjing Normal Univ, Sch Food Sci & Pharmaceut Engn, Nanjing 210009, Peoples R China

[2] Nanjing Normal Univ, Sch Life Sci, Nanjing, Peoples R China

来源：

CHEMSUSCHEM | 2024年 / 17卷 / 13期

基金：

中国国家自然科学基金;

关键词：

Mixed plastic waste; BHETase; Chemo-enzymatic depolymerization; Quantum mechanics calculations; PET recycling; POLYETHYLENE TEREPHTHALATE; POLY(ETHYLENE-TEREPHTHALATE) PET; HYDROLYSIS PRODUCTS; POLYESTER HYDROLASE; DEPOLYMERIZATION; DEGRADATION; BIODEGRADATION; GLYCOLYSIS; SEPARATION; PYROLYSIS;

D O I：

10.1002/cssc.202301612

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The heterogeneous monomers obtained from plastic waste degradation are unfavorable for PET recondensation and high-value derivative synthesis. Herein, we developed an efficient chemical-enzymatic approach to convert mixed plastic wastes into homogeneous mono-2-hydroxyethyl terephthalate (MHET) without downstream purification, benefiting from three discovered BHETases (KbEst, KbHyd, and BrevEst) in nature. Towards the mixed plastic waste, integrating the chemical K2CO3-driven glycolysis process with the BHETase depolymerization technique resulted in an MHET yield of up to 98.26 % in 40 h. Remarkably, BrevEst accomplished the highest BHET hydrolysis (similar to 87 % efficiency in 12 h) for yielding analytical-grade MHET compared to seven state-of-the-art PET hydrolases (18 %-40 %). In an investigation combining quantum theoretical computations and experimental validations, we established a MHET-initiated PET repolymerization pathway. This shortcut approach with MHET promises to strengthen the valorization of mixed plastics, offering a substantially more efficient and energy-saving route for PET recycling.

引用

页数：13