Adsorption equilibrium and dynamics of toluene vapors onto three kinds of silica gels

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Yan, K.L.^1,2 ; Wang, Q.^1,2

SINOPEC, Research Institute of Safety Engineering, 339 Songling Road, Qingdao

266000, China^1

State Key Laboratory of Safety and Control for Chemicals, 218 Yanansan Road, Qingdao

266071, China^2

关键词: Adsorption capacities;    Adsorption equilibria;    Freundlich isotherm;    Freundlich models;    Industrial waste gas;    Initial concentration;    Microporous volumes;    Pore distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012083/pdf
DOI  :  10.1088/1757-899X/292/1/012083

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The benzene is the representative of VOCs and widely exists in the industrial waste gas. In this study, adsorption equilibrium and dynamics of toluene vapors at five initial concentrations (1.39 g•m-3, 5.12 g•m-3, 8.38 g•m-3, 15.6 g•m-3, 21.3 g•m-3) onto three kinds of silica gels (GA, GB and GC) were investigated and compared. The experimental results showed that GA has the rich microporous and mesoporous distributions, and the larger surface area and microporous volume than GB and GC. It can be clearly seen that the order of the adsorption rate of adsorbents on the silica gels samples is GA, GB and GC. Due to the suitable pore distribution in the region of micropore and mesopore (1-4 nm), GA exhibits the comparable breakthrough adsorption capacities with GB and GC for a given initial concentration. Moreover, the experimental data were fitted to the Langmuir and Freundlich models, respectively. The Freundlich isotherms correlated with the experimental data presented a better fitting than Langmuir model. Taken together, it is expected that GA silica gel would be a promising adsorbent for the removal of toluene vapors from gas streams.