Sustainable conversion of waste plastics into valuable carbon materials for diverse applications provides a promising strategy to dispose the municipal and industrial waste plastics.However,it remains a challenge to precisely control the crosslinking reaction for transforming waste polyesters into N-doped porous carbon(NPC)with well-defined microstructures.Herein,we put forwards a strategy of stepwise crosslinking using melamine and ZnCl2/NaCl eutectic salts to convert poly(ethylene terephthalate)(PET)into NPC at 550℃.We prove that firstly melamine reacts with PET degradation products to form a crosslinking structure,and subsequently ZnCl2/NaCl promote the dehydration and decarbox-ylation of the crosslinking structure to generate a more thermally stable crosslinking structure.The coordination of two tandem crosslinking reactions is critical to control the microstructure of NPC.Without activations,NPC shows large specific surface area of 1173 m2 g-1,abundant N dopants,and rich oxygen-containing groups.These combined features endure NPC with excellent performance in CO2 capture and solar steam generation,e.g.,high CO2 adsorption capacity of 6.47 mmol g-1 and evaporation rate of 1.62 kg m-2 h-1.More importantly,NPC is compared to or prevails over previous carbon-based CO2 adsorbents or photothermal materials.This work will advance the research on"green"reutili-zation of low-cost polyester wastes to prepare sustainable carbon for solar energy conversion,environmental protection,etc.

Changyuan Song;Boyi Zhang;Liang Hao;Jiakang Min;Ning Liu;Ran Niu;Jiang Gong;Tao Tang

Key Laboratory of Material Chemistry for Energy Conversion and Storage,Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,430074,China;Department of Materials Science&Engineering,National University of Singapore,9 Engineering Drive 1,Singapore,117576,Singapore;State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China

绿色能源与环境（英文）

[1]Changyuan Song;Boyi Zhang;Liang Hao;Jiakang Min;Ning Liu;Ran Niu;Jiang Gong;Tao Tang-.Converting poly(ethylene terephthalate)waste into N-doped porous carbon as CO2 adsorbent and solar steam generator)[J].绿色能源与环境（英文）,2022(03):411-422

decarbox,reutili

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