High efficiency removal of NO using waste calcium carbide slag by facile KOH modification  

作　　者：Fang Wang Hui Li Jiyun Gao Na Geng Enzhu Jiang Futing Xia Mingwu Xiang Lijuan Jia Ping Ning 

机构地区：[1]School of Chemistry and Environment,Yunnan Minzu University,Kunming 650504,China [2]Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China

出　　处：《Journal of Environmental Sciences》2024年第5期182-192,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51968075);the Scientific Research Fund project of Yunnan Education Department(Nos.2022J0441 and 2022J0442)。

摘　　要：Waste calcium carbide slags(CS),which are widely applied to desulfurisation,are not typically used in denitration.Herein,to well achieve waste control by waste,a facile and highefficiency denitration strategy is developed using KOH to modify the calcium carbide slags(KCS).Various KCS samples were investigated using a series of physical and chemical characterisations.The performance test results showed that the KOH concentration and reaction temperature are the main factors affecting the denitration efficiency of KCS,and CS modified with 1.5 mol/L KOH(KCS-1.5)can achieve 100% denitration efficiency at 300℃.Such excellent removal efficiency is due to the catalytic oxidation of the oxygen-containing functional groups derived from the KCS.Further studies showed that KOH treatment significantly increased the concentration of oxygen vacancies,nitro compounds,and basic sites of CS.This study provides a novel strategy for the resource utilisation of waste CS in the future.

关 键 词：WASTE Carbide slag KOH Effective denitration 

分 类 号：X51[环境科学与工程—环境工程] X705