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Preparation of Solid Waste-Based Activated Carbon and Its Adsorption Mechanism for Toluene

China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 100-110页

作者： Li Zhi Li Yunpeng Liu Jun Si Wenzhe Zhang Yongfa Li Junhua Taiyuan University of Technology College of Chemistry and Chemical EngineeringState Key Laboratory of Clean and Efficient Coal UtilizationTaiyuan 030024 Tsinghua University College of EnvironmentNational Engineering Research Center for Coordinated Control of Air Pollutants and Greenhouse GasesBeijing 100084 Zibo Pengda Environmental Protection Technology Co. Ltd.Zibo 255420

Regenerated activated carbon(RAC)samples were prepared by carbon activation using waste activated carbon from solid waste resources as the carbon source precursor coupled with adding alkaline additives,and then were further modified by potassium ferrate to finally prepare high-performance carbon for VOCs *** the same time,the samples before and after modification were systematically studied through characterization techniques such as SEM,Raman spectrometry,FT-IR,XPS,and dynamic/static *** results showed that the specific surface area and pore volume of the RAC after modification by the strong oxidant potassium ferrate increased by 1.4 times;the degree of defects was enhanced and the content of oxygen-containing functional groups on the surface increased *** them,the sample modified with potassium ferrate for 24 h had the best dynamic toluene adsorption performance(375.5 mg/g),and the dynamic adsorption capacity was twice that of the original sample(192.8 mg/g).The static adsorption test found that the maximum adsorption capacity of RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h was 796 mg/g,which indicated that the potassium ferrate modification treatment could significantly increase the VOCs adsorption performance of *** addition,through consecutive toluene adsorption-desorption cycle tests,it was found that the RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h sample still retained 91%of adsorption activity after the fifth regeneration *** indicates that RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h has good cycle stability and great application value for the efficient purification of industrial waste VOCs gas.

关键词： waste activated carbon toluene adsorption potassium ferrate modification oxygen-containing functional groups regeneration ability

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