化工进展2017，Vol.36Issue(5)：1818-1824,7.DOI:10.16085/j.issn.1000-6613.2017.05.032
沉淀白炭黑吸湿特性及动力学、热力学分析
Adsorption characteristic of moisture by precipitated silica including kinetics and thermodynamics analysis
胡志波 1郑水林 1陈洋 1刘阳钰 1孙志明1
作者信息
- 1. 中国矿业大学(北京)化学与环境工程学院,北京 100083
- 折叠
摘要
Abstract
Precipitated silica is an important adsorption material. The ability of moisture adsorption of precipitated silica was tested under different temperatures(15℃,20℃,25℃ and 30℃)and various relative humidities(RH=11%,33%,43%,75%,85% and 98%). And the dynamics of moisture adsorption was analyzed. The isothermal adsorption heat of precipitated silica was calculated based on the principle of thermodynamics of porous media isothermal adsorption. The adsorption mechanism was analyzed by XRD,SEM,FTIR,and pore structure. The results showed that the precipitated silica had excellent performance on the moisture adsorption. The moisture content reached 23.71% under the condition of 30℃ and 98%RH after 48 hours. Precipitated silica performed better under lower temperatures and higher relative humidities when the relative humidity was between 11% and 85%, while moisture adsorption ability increased with the rise of temperature when the relative humidity was 98%. The adsorption reaction was consistent with the pseudo second order kinetics equation. It could be concluded that the moisture adsorption isotherms is S type physical adsorption of condensable vapor in porous material,and Van der Waals force and hydrogen bond are the main forces.关键词
沉淀白炭黑/吸湿/动力学/热力学Key words
precipitated silica/moisture adsorption/kinetics/thermodynamics分类
通用工业技术引用本文复制引用
胡志波,郑水林,陈洋,刘阳钰,孙志明..沉淀白炭黑吸湿特性及动力学、热力学分析[J].化工进展,2017,36(5):1818-1824,7.
