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Novel synergistic hydrous iron-nickel-manganese (HINM) trimetal oxide for hazardous arsenite removal

Mohamed Nasir, Azalina and Goh, P. S. and Ismail, A. F. (2018) Novel synergistic hydrous iron-nickel-manganese (HINM) trimetal oxide for hazardous arsenite removal. Chemosphere, 200 . pp. 504-512. ISSN 0045-6535

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Official URL: http://dx.doi.org/10.1016/j.chemosphere.2018.02.12...

Abstract

A novel hydrous iron-nickel-manganese (HINM) trimetal oxide was successfully fabricated using oxidation and coprecipitation method for metalloid arsenite removal. The atomic ratio of Fe:Ni:Mn for this adsorbent is 3:2:1. HINM adsorbent was identified as an amorphous nanosized adsorbent with particle size ranged from 30 nm to 60 nm meanwhile the total active surface area and pore diameter of HINM area of 195.78 m2/g and 2.43 nm, respectively. Experimental data of arsenite adsorption is best fitted into pseudo-second order and Freundlich isotherm model. The maximum adsorption capacity of arsenite onto HINM was 81.9 mg/g. Thermodynamic study showed that the adsorption of arsenite was a spontaneous and endothermic reaction with enthalpy change of 14.04 kJ/mol and Gibbs energy of −12 to −14 kJ/mol. Zeta potential, thermal gravimetric (TGA) and Fourier transform infrared (FTIR) analysis were applied to elucidate the mechanism of arsenite adsorption by HINM. Mechanism of arsenite adsorption by HINM involved both chemisorption and physisorption based on the electrostatic attraction between arsenite ions and surface charge of HINM. It also involved the hydroxyl substitution by arsenite ions through the formation of inner-sphere complex. Reusability of HINM trimetal oxide was up to 89% after three cycles of testing implied that HINM trimetal oxide is a promising and practical adsorbent for arsenite.

Item Type:Article
Uncontrolled Keywords:Arsenite, Isotherm
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:86116
Deposited By: Widya Wahid
Deposited On:30 Aug 2020 16:56
Last Modified:30 Aug 2020 16:56

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