Nowadays,a large amount of waste fabrics has brought huge environmental and resource problems,while the traditional recycling routes are downcycling with low efficiency and complex separation processes.Herein,we demonstrate a green and facile route to up-recycle waste fabrics(cotton-polyester blending or cotton fabrics)into a high-performance microwave absorber.In this design,an assistant coating was deposited onto the fiber surface of the waste fabric through the assembly of tannic acid-Fe2+(TA-Fe2+),which effectively catalyzed the polymer fiber into highly graphitized porous carbon fiber at high temper-atures.Meanwhile,the Fe nanoparticles from the reduction of Fe2+ions were evenly embedded on the surface of porous carbon fibers.Consequently,the resultant porous carbon/Fe composites with hierarchi-cal microstructures displayed excellent microwave absorption performances.Typically,the microwave ab-sorber from waste polyester-cotton blended fabric could reach a minimum reflection loss(RL)of-50.5 dB at a thin coating thickness of 1.7 mm,and the minimum RL from waste cotton fabric absorber reached-47.1 dB at a thickness of 2.5 mm.This work provides a new idea to convert waste fabrics into high value-added microwave absorbing materials in a simple and environmentally friendly way,which will help reuse resources and protect the environment.

Jin-Bo Cheng;Hai-Bo Zhao;Ai-Ning Zhang;Yan-Qin Wang;Yu-Zhong Wang

Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE),State Key Laboratory of Polymer Materials Engineering,National Engineering Laboratory for Eco-Friendly Polymer Materials(Sichuan),College of Chemistry,Sichuan University,Chengdu 610064,China

材料科学技术（英文版）

[1]Jin-Bo Cheng;Hai-Bo Zhao;Ai-Ning Zhang;Yan-Qin Wang;Yu-Zhong Wang-.Porous carbon/Fe composites from waste fabric for high-efficiency electromagnetic wave absorption)[J].材料科学技术（英文版）,2022(31):266-274

downcycling,Fe2+ions,sorber

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