Abstract
Recently great efforts have been focused on designing high-performance microwave absorbers using sus-tainable biomass resources,but there remains a lack of green and efficient fabrication methods.Herein,inspired by natural porous character of biomass waste,we demonstrated a green one-step route to con-vert waste coffee grounds into porous C/Fe hybrids,and further explored their potential applications for broadband and high-efficiency microwave absorption.In this design,the WCG-20-750(incorporated 20 wt％Fe(C5H7O2)3 catalyst and carbonized at 750 ℃)exhibited porous microstructure with the highest char yield of 55.45 wt％.Furthermore,the as-prepared C/Fe hybrids from WCG-20-750 displayed excellent microwave absorption performances.Typically,the minimum reflection loss(RLmin)reached to-52.86 dB and the widest effective absorption bandwidth(EAB)was 6.40 GHz at the thickness of 3.0 mm.This work provides an economically viable and environmentally friendly strategy to convert biomass wastes into value-added microwave absorbers,ultimately making contributions to the upcycling of renewable biomass resources and the fostering of sustainable environment.
基金项目
Taishan Scholar Constructive Engineering Foundation(tsqn202103079)
Talent Startup Foundation of Qingdao University of Science and Technology(202203870)
NETL
NSTL
万方数据