燃料化学学报2021，Vol.49Issue(6)：861-872,12.DOI:10.1016/S1872-5813(21)60090-7
多壁碳纳米管-二氧化硅吸附剂对甲苯的吸附性能
Adsorption performance of multi-walled carbon nanotube-SiO2 adsorbent for toluene
摘要
Abstract
In this study, multi-walled carbon nanotube (MWCNTs)-SiO2 composite adsorbents MWCNTs-SiO2-2, MWCNTs-SiO2-4, MWCNTs-SiO2-6 (CS2, CS4, CS6) with molar percentages of MWCNTs of 38％, 52％, and 66％ were synthesized using the sol-gel method. The effects of the MWCNT content, temperature (30?60 ℃), water vapor concentration (1％?5％), and the number of cycles on the adsorption capacity of toluene were studied, and an adsorption kinetics analysis was performed. The results showed that the adsorption capacity for toluene at 30?60 ℃was AC (activated carbon) < CS2 <CS4 < CS6, and the adsorption capacity of CS6 to toluene was up to 50.28 mg/g. For every 10 ℃increase in temperature, the penetration time decreased by 10?20 min, and the adsorption content decreased by 3.5％ for every 1％ increase in water vapor concentration. The phase with the fastest mass transfer rate of toluene could be described by the quasi-secondary adsorption kinetics model, in which intraparticle diffusion plays a major role. The mole percentage of MWCNTs ranged from 38％ to 66％, the higher the content was, the easier it was to adsorb toluene. The functional group types of the MWCNTs-SiO2 adsorbent after regeneration did not change, and the adsorbent maintained good adsorption performance.关键词
挥发性有机化合物/多壁碳纳米管/二氧化硅/吸附/动力学Key words
volatile organic compounds/multi-walled carbon nanotubes/silicon dioxide (SiO2)/adsorption/kinetics分类
资源环境引用本文复制引用
刘微,李壮,张绍鹏,建伟伟,马丹竹..多壁碳纳米管-二氧化硅吸附剂对甲苯的吸附性能[J].燃料化学学报,2021,49(6):861-872,12.基金项目
The project was upported by Scientific Research Project of Liaoning Provincial Education Department (L2019026, L2019047), the Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering, MOE (KLIEEE1804), the Natural Science Foundation Guidance and Planning Program of Liaoning Province, China (2019-ZD0065), Liaoning Revitalization Talents Program (XLYC2007143). （L2019026, L2019047）
