Rapid and efficient removal/recovery of molybdenum onto ZnFe2O4 nanoparticles
Journal
Chemosphere
Date Issued
2016-04
Author(s)
Abstract
An efficient method for removing and recovering molybdenum (Mo) from water was developed by using ZnFe2O4 nanoparticles. The Mo adsorption displayed a nonlinear isotherm that fitted well with the Langmuir isotherm, showing limited adsorption sites on the surface of ZnFe2O4. The adsorption of Mo(VI) was dependent on solution pH. With increasing pH, the build-up of negative charges of both adsorbent and adsorbate led to enhanced electric repulsion between them. The K-edge XANES spectra for the adsorbents collected after Mo adsorption revealed that Mo(VI) was the predominant oxidation state sorbed on ZnFe2O4, indicating that the reduction of Mo(VI) did not occur on ZnFe2O4. The different peak positions of k-space and R-space shown in K-edge EXAFS spectra demonstrated that the adsorbed Mo could be bound on the surface or be slipped in the vacancy position of the ZnFe2O4 crystal. Importantly, Mo could be efficiently adsorbed from photoelectric industrial wastewater and these adsorbed Mo anions were rapidly replaced by OH- ions, implying the potential for Mo removing and recovering in industrial wastewater. © 2016 Elsevier Ltd.
Subjects
EXAFS; Kinetics and isotherms; Molybdenum; XANES; ZnFe2O4
SDGs
Other Subjects
Adsorption; Iron compounds; Isotherms; Molybdenum; Nanoparticles; Zinc compounds; Adsorption site; Electric repulsion; EXAFS; Industrial wastewaters; Langmuir isotherm; Nonlinear isotherms; XANES; ZnFe2O4; Molybdenum compounds; adsorbent; molybdenum; ultrasmall superparamagnetic iron oxide; unclassified drug; zinc iron oxide nanoparticle; ferric ion; industrial waste; molybdenum; nanoparticle; waste water; water pollutant; zinc; industrial waste; isotherm; molybdenum; nanoparticle; pollutant removal; reaction kinetics; reduction; wastewater; water treatment; adsorption kinetics; aqueous solution; Article; crystal structure; desorption; extended X ray absorption fine structure; feasibility study; isotherm; metal recovery; oxidation; oxidation reduction reaction; particle size; pH; proton transport; rate constant; surface charge; surface property; waste water management; X ray absorption near edge spectra; X ray absorption spectroscopy; adsorption; chemistry; industrial waste; procedures; waste water; water management; water pollutant; Adsorption; Ferric Compounds; Industrial Waste; Molybdenum; Nanoparticles; Waste Water; Water Pollutants, Chemical; Water Purification; Zinc
Type
journal article