Copper adsorption onto synthesized nitrilotriacetic acid functionalized Fe3O4 nanoparticles: kinetic, equilibrium and thermodynamic studies. Issue 3 (September 2015)

• Record Type: Journal Article
• Authors: Singh, Dharmveer; Verma, Shalini; Gautam, Ravindra Kumar; Krishna, Vijay
• Is Part Of: Journal of environmental chemical engineering. Volume 3:Issue 3(2015:Sep.)
• Page Start: 2161
• Page End: 2171
• Publication Date: 2015-09
• Subjects: AFM -- Equilibrium isotherms -- Fe3O4 -- Nitrilotriacetic acid -- Kinetic; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2015.07.020
• Languages: English
• ISSNs: 2213-2929

Abstract

Highlights: Functionalized Fe3 O4 nanoparticles (Fe3 O4 -NTA) were developed for the removal of Cu(II) ions from aqueous solution. AFM study was carried out to investigate the surface roughness of Fe3 O4 -NTA. Maximum adsorption capacity was obtained under optimized pH 5 and contact time 35 min. The prepared adsorbent shows good reusability for removal of heavy metals. Abstract: The continuous discharge of heavy metals into the near water bodies causes great harm to the human and aquatic ecosystem. Several adsorbent have been developed and applied for effective removal of metal ions from water. In this paper nitrilotriacetic acid (NTA) functionalized Fe3 O4 nanoparticles (Fe3 O4 -NTA) were developed by coprecipitation method with iron salt and NTA, shown to be effective removal of Cu(II) ions from aqueous solution. The functionalized nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), X ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Brunauer–Emmett–Teller Surface area analyzer (BET), and pHzpc . The various effecting factors of Cu(II) ions adsorption from aqueous solution such as contact time, adsorbate dose, and pH were investigated. The kinetics models such as pseudo-first-order, pseudo-second-order, Elovich, and intra-particles diffusion were applied on experimental Cu(II) adsorption. The kinetic data showed pseudo-second-order model was found to be better agreement with correlation coefficient, R 2 = 0.997–0.999 at 60–12 mg L −1 . The equilibrium adsorption data modeled with Langmuir, Freundlich, and Dubinin–Radushkevich isotherms found to be better fitted with Langmuir reveal the monolayer adsorption of Cu(II) ions on the surface of Fe3 O4 -NTA with maximum adsorption capacity of 34.63, 38.8 and 40.24 mg L −1 at 298, 303 and 308 K, respectively. The positive value of Δ H° (35.127 kJ mol −1 ) and Δ S° (176.031 kJ mol −1 K −1 ) indicates the endothermic nature of Cu(II) adsorption onto Fe3 O4 -NTA. The negative value of ΔG ° (7.365–8.005 kJ mol −1 ) indicates spontaneous nature of adsorption.