Isothermal and kinetic adsorption of anionic dye onto impregnated silica gels with aluminum

Yudi Aris Sulistiyo1, Faizatur Rofiah1, 1, Ari Satia Nugraha2, 3, Gagus Ketut Sunnardianto4

1 Inorganic Material for Energy and Environment Research Group, Department of Chemistry, Faculty of Mathematics and Natural Science, University of Jember, Jember, Indonesia 68121
2 Drug Utilisation and Discovery Reseach Group, Faculty of Pharmacy, University of Jember, Jember, Indonesia 68121
3 Sensor and Chemical Instrumentation Research Group, Department of Chemistry, Faculty of Mathematics and Natural Science, University of Jember, Jember, Indonesia 68121
4 Research Center for Chemistry, Indonesian Institute of Sciences (LIPI), Kawasan Puspitek Serpong, Tangerang Selatan, 15314, Indonesia

Abstract


Impregnation of aluminium ion onto silica gel (SG) surface (Al/SG) is to increase the adsorption capacity of an anionic dye such as Indigo carmine (IC). The impregnation was carried out using wetness impregnation. The change of the functional group was evaluated by FTIR, crystallinity was determined using XRD, surface morphology were studied by SEM-EDX, while surface area and pore size using N2 gas adsorption-desorption analyzer. Meanwhile, the best of IC adsorption condition onto SG and Al/SG occurred consecutively at pH 2 and 3. The optimum adsorption of both adsorbent was 25.707 and 88.143 mg.g-1 with the adsorption efficiency 21.82% and 80.47%, respectively. Whereas, isothermal adsorption model of SG and Al/SG consecutively followed Langmuir and Freundlich model. The equilibrium adsorption was achieved in 60 min of contact time following pseudo-second order kinetic model. This study provides information about the replacing negative charge in the surface of the adsorbent with cation would increase the adsorption capacity of the anionic adsorbate.

Keywords


adsorption isotherm; adsorption kinetic; aluminum impregnation; anionic dye indigo carmine; modified silica gels

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