YANG Qing-xia, WU Hong-hai, YANG Lu-yao, LI Guan-yan, GUAN Yu-feng, HE Guang-ping

(School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China)

Abstract: In this study, several thermally modified montmorillonite products (MMt) were prepared at different temperatures, with characterization of these MMt materials with respect to their bulk structure and surface nature. Batch adsorption experiments were then conducted to measure and compare the adsorption ability of 1,3-dinitrobenzene (m-DNB) by montmorillonite (Mt) and its MMts. Results show that with increasing treatment temperature, Mt would greatly lose the interlayer or even the structural water, and thus, the interlamellar spacing（d001）decrease to the value of 0.98 nm, approaching to its theoretical value. When calcined temperature is under 650 ℃, meanwhile the adsorption effect of m-DNB on Mt and MMts are strengthened gradually. The Langmuir model show a better fit to the adsorption of m-DNB as compared with the case of Freundlich model. Under condition of K+ cation with an appropriate concentration, the effects of both EDA (electron donor–acceptor) and K+-NO2 group (cation-polar) interactions on the m-DNB adsorption are strengthened also. When calcined temperature is up 650 ℃, the adsorption effects of m-DNB on MMt are weakened. Moreover, the adsorption of m-DNB to Mt and its MMt is an exothermal process, and thus a spontaneous process.

Keywords: 1,3-dinitrobenzene; montmorillnite; calcined montmorillnite; adsorption; strengthen

E-mail：wuhonghai@scnu.edu.cn

ACTA MINERALOGICA SINICA Vol. 36, No. 3, 2016, Page 391-396