title: Adsorption kinetics and isotherms of arsenic(V) from aqueous solution onto Ni0.5Zn0.5Fe2O4 nanoparticles.
abstract: Magnetic Ni0.5Zn0.5Fe2O4 nanoparticles were synthesized by the facile citrate-gel process. Their morphology, chemical composition, microstructure, and magnetic properties were investigated by XRD, TEM, EDX, BET, and VSM. The as-prepared magnetic Ni0.5Zn0.5Fe2O4 nanoparticles consisting of grains about 20 nm were characterized with specific surface area of 49.0 m2/g and magnetization of 46.1 A m2/kg. The arsenic(V) adsorption onto these magnetic Ni0.5Zn0.5Fe2O4 nanoparticles at room temperature was determined by the ICP-AES measurement of arsenic(V) in aqueous solution. The results show that the pseudo-second-order kinetic model is fitted well to describe the arsenic(V) adsorption process with a determination coefficient (R2 = 0.9862). By comparing with the two- and three-parameter models for adsorption isotherms of arsenic(V) onto the magnetic Ni0.5Zn0.5Fe2O4 nanoparticles at room temperature, the Temkin and Redlich-Peterson model can be used to evaluate the arsenic(V) adsorption isotherm at room temperature. The arsenic(V) equilibrium adsorption quantity is up to 7.2 mg/g for these magnetic Ni0.5Zn0.5Fe2O4 nanoparticles when the initial arsenic(V) concentration is 3 mg/L in aqueous solution.
authors.affiliation: School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Ruijiang
authors.initials: R
authors.lastname: Liu
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.forename: Xiangqian
authors.initials: X
authors.lastname: Shen
authors.forename: Xinchun
authors.initials: X
authors.lastname: Yang
authors.forename: Xuewen
authors.initials: X
authors.lastname: Cui
authors.forename: Yingying
authors.initials: Y
authors.lastname: Gao
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008280:Magnetics; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D012996:Solutions; D013696:Temperature; D013816:Thermodynamics; D014867:Water
chemical_list: D012996:Solutions; D014867:Water; D001151:Arsenic