丝胶蛋白基多孔碳的制备及其吸波性能研究

Preparation of silk sericin-based porous carbon and its microwave absorption property

为解决传统多孔碳材料制备工艺繁杂、污染大、成本高等问题,采用活化-碳化法处理废弃的丝胶蛋白,制备原位杂原子掺杂丝胶蛋白基多孔碳材料(Silk sericin-based derived porous carbon,SSC)。采用扫描电镜、X射线衍射仪和拉曼光谱仪对试样的形貌和结构进行表征,通过矢量网络分析仪测试材料电磁参数,探讨热处理温度对材料吸波性能的影响。结果表明:当丝胶蛋白和活化剂KHCO3质量比为2∶1、热处理温度为700℃时,制备的试样SSC-700具有最优吸波性能,且试样在16.55GHz处达到最小反射损耗(-51.30dB),匹配厚度为1.4mm,有效吸波频宽为3.60GHz(14.40~18.00GHz);SSC-700良好的吸波性能归因于材料自身的导电损耗和多种极化机制的协同作用。研究为生物质碳材料的开发和利用提供了新策略,制得的SSC材料在吸波领域具有广泛的应用前景。

To solve the problems of complicated process,severe pollution and high cost in the preparation process of traditional porous carbon materials,in-situ doping silk sericin-based derived porous carbon(SSC)materials were prepared with waste sericin treated by activation-carbonization method.The morphology and structure of the materials were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and laser Raman spectrometer(Raman).The influence of the heat treatment temperature on the microwave absorption properties of the materials were analyzed by vector network analyzer.The results show that the samples exhibit the best microwave absorption properties when the mass ratios of silk sericin and activator KHCO3are 2∶1and the heat treatment temperature is 700℃.The SSC-700samples have the best absorbing performance,and the minimum reflection loss is-51.30dB at 16.55GHz,and the effective absorption bandwidth is 3.60GHz(14.40~18.00GHz)corresponding to the thicknesses of 1.4mm.The material′s own conductivity loss and the synergy of multiple polarization mechanisms give SSC-700excellent microwave absorption performance.This study provides a new strategy for the development and utilization of biomass carbon materials,and the resulting SSC materials have a wide range of applications in the field of microwave absorption.