沉淀白炭黑吸湿特性及动力学、热力学分析

doi:10.16085/j.issn.1000-6613.2017.05.032

化工进展 ›› 2017, Vol. 36 ›› Issue (05): 1818-1824.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

胡志波, 郑水林, 陈洋, 刘阳钰, 孙志明

中国矿业大学(北京)化学与环境工程学院, 北京 100083

收稿日期:2016-07-22 修回日期:2017-01-04 出版日期:2017-05-05 发布日期:2017-05-05
通讯作者: 郑水林,教授,博士生导师,研究方向为资源综合利用与非金属深加工、粉体加工与矿物材料制备技术。
作者简介:胡志波(1987-),男,博士研究生,研究方向为非金属矿物材料。E-mail:huzhibo649@126.com。

Adsorption characteristic of moisture by precipitated silica including kinetics and thermodynamics analysis

HU Zhibo, ZHENG Shuilin, CHEN Yang, LIU Yangyu, SUN Zhiming

School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Received:2016-07-22 Revised:2017-01-04 Online:2017-05-05 Published:2017-05-05

摘要/Abstract

摘要： 白炭黑是一种重要的吸附材料，以沉淀白炭黑为原料，研究了沉淀白炭黑在温度为15℃、20℃、25℃和30℃，相对湿度为11%、33%、43%、75%、85%和98%条件下的吸湿性能，并进行吸湿动力学分析。利用多孔介质等温吸附热力学原理，计算沉淀白炭黑的等温吸附热。结合XRD、SEM、FTIR和氮吸附法分析沉淀白炭黑的吸湿机理。结果表明：沉淀白炭黑具有良好的吸湿性能，在温度为30℃、相对湿度为98%时48h吸湿量达到23.71%。相对湿度在11%~85%范围内，温度越低、相对湿度越高，沉淀白炭黑的吸湿性能越强；相对湿度为98%时，温度越高，沉淀白炭黑的吸湿性能越强。沉淀白炭黑的吸湿动力学符合准二级动力学模型。等温吸湿曲线符合典型的可冷凝蒸汽在孔隙物质中物理吸附的S型曲线，水分子与沉淀白炭黑之间的作用力主要为范德华力和氢键作用。

关键词: 沉淀白炭黑, 吸湿, 动力学, 热力学

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.

Key words: precipitated silica, moisture adsorption, kinetics, thermodynamics

中图分类号:

TB321

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(05): 1818-1824.

HU Zhibo, ZHENG Shuilin, CHEN Yang, LIU Yangyu, SUN Zhiming. Adsorption characteristic of moisture by precipitated silica including kinetics and thermodynamics analysis[J]. Chemical Industry and Engineering Progress, 2017, 36(05): 1818-1824.

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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

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