Novel synergistic hydrous iron-nickel-manganese (HINM) trimetal oxide for hazardous arsenite removal. (June 2018)

• Record Type: Journal Article
• Authors: Nasir, A.M.; Goh, P.S.; Ismail, A.F.
• Is Part Of: Chemosphere. Volume 200(2018)
• Page Start: 504
• Page End: 512
• Publication Date: 2018-06
• Subjects: Fe-Ni-Mn trimetal oxide -- Arsenite -- Mechanism -- Thermodynamic -- Isotherm -- Kinetic; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.02.126
• Languages: English
• ISSNs: 0045-6535

Abstract

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 m 2 /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. Graphical abstract: Highlights: Novel hydrous Fe-Ni-Mn (HINM) was successfully synthesized as arsenite adsorbent. Adsorption by nanostructured and mesoporous HINM obeyed Freundlich isotherm model. Arsenite was adsorbed endothermically by HINM. Electrostatic interaction and formation of inner-sphere complex are main mechanism.