Efficient and selective upcycling of waste polylactic acid into acetate using nickel selenide  

作　　者：Bing Lan Yinfang Chen Nantian Xiao Na Liu Chao Juan Chuan Xia Fan Zhang 

机构地区：[1]National Engineering Laboratory of Eco-Friendly Polymeric Materials,College of Chemistry,Sichuan University,Chengdu 610064,Sichuan,China [2]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China

出　　处：《Journal of Energy Chemistry》2024年第10期575-584,I0012,共11页能源化学（英文版）

基　　金：financially supported by the National Key R&D Program of China (2021YFA1501700);the National Science Foundation of China (22272114);the Fundamental Research Funds from Sichuan University (2022SCUNL103);the Funding for Hundred Talent Program of Sichuan University (20822041E4079);the NSFC (22102018 and 52171201);the Huzhou Science and Technology Bureau (2022GZ45);the Hefei National Research Center for Physical Sciences at the Microscale (KF2021005)。

摘　　要：The conversion of waste polylactic acid(PLA)plastics into high-value-added chemicals through electrochemical methods is a promising and sustainable approach.However,developing efficient and highly selective catalysts for lactic acid oxidation reaction(LAOR)and understanding the reaction process are challenging.Here,we report the electrooxidation of waste PLA to acetate at a high current density of 100 mA cm-2 with high Faraday efficiency(~95%)and excellent stability(>100 h)over a nickel selenide nanosheet catalyst.In addition,a total Faraday efficiency of up to 190%was achieved for carboxylic acids,including acetic acid and formic acid,by coupling with the cathodic CO_(2) reduction reaction.In situ experimental results and theoretical simulations revealed that the catalytic activity center of LAOR was dynamically formed NiOOH species,and the surface-adsorbed SeO_(x) species accelerated the formation of Ni~(3+)species,thus promoting catalytic activity.The mechanism of lactic acid electrooxidation was further elucidated.Lactic acid was dehydrogenated to produce pyruvate first and then formed CH_3CO due to preferential C-C bond cleavage,resulting in the presence of acetate.This work demonstrated a sustainable method for recycling waste PLA and CO_(2) into high-value-added products.

关 键 词：Waste plastic upcycling Poly(lactic acid) Lactic acid electro-oxidation Acetic acid 

分 类 号：TQ426[化学工程] X705[环境科学与工程—环境工程]