Preparation and Characterization of Dabco (1,4-Diazabicyclo [2.2.2]octane) modified bentonite: Application for Congo red removal

International Conference on Chemistry and Material Science 2017

化学;材料科学

Taher, Tarmizi^1 ; Rohendi, Dedi^2 ; Mohadi, Risfidian^2 ; Lesbani, Aldes^1,2

Environmental Science Study, Program Pascasarjana Universitas Sriwijaya, Jl. Padang Selasa, No. 524, Bukit Besar, Palembang, Indonesia^1

Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih, Km. 32, Indralaya, Ogan Ilir, Indonesia^2

关键词: 1 ,4-diazabicyclo[2.2.2]octane;    Adsorption experiment;    Congo red;    Freundlich adsorption isotherms;    Modified bentonites;    Montmorillonite interlayer;    Natural bentonite;    Second order kinetics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/299/1/012055/pdf
DOI  :  10.1088/1757-899X/299/1/012055

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Natural bentonite provided from Sarolangun deposit was modified with 1,4-Diazabicyclo[2.2.2]octane (Dabco) to form a new class of porous material. Prior further modification, the natural bentonite was cleaned up and activated by NaCl to remove the impurities and increase the bentonite nature. Dabco modified bentonite (Dabco-bent) was prepared by exchanging the inorganic cation placed in the interlayer space of the montmorillonite mineral structure with the 0.01 M Dabco1+at pH 6. The modified bentonite products were characterized using X-Ray powder diffraction and FT-IR to monitor the change of the bentonite crystallinity and function group due to the modification process. The XRD result confirmed that during the modification process, the d(001) of smectite peak at 2q around 6° was shifted. After the modification, the d(001) reflection of the montmorillonite interlayer was shifted 0.36° to the left indicating that the interlayer space of the montmorillonite has been expanded during the modification process. The FTIR spectra of Dabco modified bentonite exhibit no significantly different with the host bentonite. However, the presence of the new band at the wavenumber around 3000 and 2800 cm-1indicates that the Dabco molecule has been successfully inserted to the bentonite molecule. The Congo red adsorption experiment was performed onto Dabco-bent product by batch technique. The experiment data described that kinetic model for Congo red adsorption onto Dabco-bent was adequately followed the second-order kinetic model and well described by Freundlich adsorption isotherm model.