Synthesis of β-cyclodextrin/mesoporous attapulgite composites and their novel application in adsorption of 2,4,6-trichlorophenol and 2,4,5-trichlorophenol

Abstract

In this work, mesoporous attapulgite (mATP) was firstly prepared in the presence of the cetyltrimethylammonium bromide using attapulgite (ATP) as the matrix materials. Then, it was modified by β-cyclodextrin (β-CD) to obtain the β-cyclodextrin/mesoporous attapulgite composites (β-CD/mATP). The characterization of the composites showed that β-CD/mATP composites remained excellent channel structure and the value of the specific surface area was 300.30 m²/g. As-prepared β-CD/mATP was evaluated as sorbents to adsorption of 2,4,6-trichlorophenol (2,4,6-TCP) and 2,4,5-trichlorophenol (2,4,5-TCP). The results of the batch mode experiment revealed that the Langmuir isotherm model fitted the equilibrium data better, while the kinetic data could be described by pseudo-second-order model perfectly. Furthermore, 2,4,5-TCP adsorption onto β-CD/mATP was more affected than that of 2,4,6-TCP in the presence of competitive phenolic compound. In addition, β-CD/mATP possessed excellent regeneration property.

Keywords:

• Mesoporous attapulgite
• β-cyclodextrin
• 2,4,6-trichlorophenol (2,4,6-TCP)
• 2,4,5-trichlorophenol (2,4,5-TCP)
• Adsorption

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 21107037, No. 21176107), Natural Science Foundation of Jiangsu Province (No. BK2011461, No. BK2011514), National Postdoctoral Science Foundation (No. 2013M530240), PhD. Innovation Programs Foundation of Jiangsu Province (No. CXZZ12_0669), Postdoctoral Science Foundation funded Project of Jiangsu Province (No. 1202002B), and Programs of Senior Talent Foundation of Jiangsu University (No. 12JDG090).