β-Cyclodextrin functionalized SBA-15 via amide linkage as a super adsorbent for rapid removal of methyl blue

Dongli Li; Kungang Chai; Xingdong Yao; Liqin Zhou; Kongyou Wu; Zhenghui Huang; Juntao Yan; Xingzhen Qin; Wei Wei; Hongbing Ji

doi:10.1016/j.jcis.2020.09.006

β-Cyclodextrin functionalized SBA-15 via amide linkage as a super adsorbent for rapid removal of methyl blue

J Colloid Interface Sci. 2021 Feb 1:583:100-112. doi: 10.1016/j.jcis.2020.09.006. Epub 2020 Sep 15.

Authors

Affiliations

¹ School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, PR China.
² School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, PR China. Electronic address: chaikungang@gxu.edu.cn.
³ Key Laboratory of Forest Chemistry & Engineering of Guangxi, Guangxi University for Nationalities, Nanning 530006, PR China.
⁴ School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, PR China; Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, PR China. Electronic address: jihb@mail.sysu.edu.cn.

PMID: 32980680
DOI: 10.1016/j.jcis.2020.09.006

Abstract

To remove the bulky aqueous organic dye e.g. methyl blue (MB) from water, ordered mesoporous silica SBA-15 has been functionalized with β-cyclodextrin (β-CD) via amide linkage. The surface physical and chemical properties of the surface of the resulted β-CD-functionalized adsorbents (abbrev. SBA15-A-CD) were characterized systematically. The results indicate that the channels of SBA-15 were uniformly modified with amine groups and were further β-CD-terminated via amide linkages, without ruining its ordered mesoporous structure. The effects of contact time, pH, ionic strength, temperature and salt on the adsorption performance were explored. SBA15-A-CD showed maximum adsorption capacity for MB up to 1791 mg·g^-1 combined with excellent recyclability. Besides, the adsorption behavior of MB onto SBA15-A-CD has been investigated by DFT calculation and two-dimensional NMR. Specifically, the enhanced adsorption capacity for MB stems from the tailored host-guest interaction between β-CD cavity and aromatic moiety of MB in combination with the electrostatic attraction between amine groups and sulfonated group of MB. These findings offer good opportunities for improving the ability of mesoporous silica in adsorption of bulky anion dyes in wastewater.

Keywords: Adsorption; Bulky dye; Functionalization; Theoretical calculation; β-Cyclodextrin.