建筑废弃物木屑材料制备多孔碳材料

摘要/Abstract

摘要： 为研究建筑废弃物——锯末木屑在环保中的应用,以NaNH₂为活化剂和氮源,利用一步热解法制备了氮掺杂的多孔碳材料,采用X射线衍射、X光电子衍射、氮气吸附-脱附等温线等方法对样品进行表征。结果发现样品主要由微孔构成,大的比表面积和高的氮含量相互协同,为CO₂的电化学还原反应提供了丰富的催化活性位点和CO₂反应物。电化学测试研究结果发现,样品还原CO₂的主产物为CO,在-0.7 V(可逆氢电极,RHE)的过电势下,CO的法拉第效率高达82%,且样品可持续稳定电解18 h。说明以建筑废弃木屑材料制备的多孔碳可有效还原CO₂,实现在环保领域中的应用。

关键词: 废木屑, NaNH₂, 电化学, CO₂还原, CO

Abstract: In order to study the application of construction waste sawdust in environment protection, nitrogen doped porous carbon materials were prepared by one-step pyrolysis method with NaNH₂ as activator and nitrogen source. The samples were characterized by X-ray diffraction, X-ray photoelectron, N₂ adsorption-desorption isotherm and other methods. It is found that the samples are mainly composed of micropores. Synergism of the large specific surface area and high nitrogen content provide abundant catalytically active sites and CO₂ reactant for electrochemical CO₂ reduction reaction. The electrochemical test suggests that CO is the main product in CO₂ electrochemical reduction, the Faraday efficiency of CO is up to 82% at the overpotential of -0.7 V (reversible hydrogen electrode, RHE). More importantly, the electrolysis can be maintain as long as 18 h. The results indicate that construction waste sawdust derived porous carbons effectively reduce CO₂ and realize the application in the field of environment protection.

Key words: waste sawdust, NaNH₂, electrochemistry, CO₂ reduction, CO

中图分类号:

谢竺. 建筑废弃物木屑材料制备多孔碳材料[J]. 硅酸盐通报, 2020, 39(12): 3952-3957.

XIE Zhu. Preparation of Porous Carbon Materials from Construction WasteSawdust[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3952-3957.

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