title: Adsorption of heavy metals from aqueous solutions by Mg-Al-Zn mingled oxides adsorbent.
abstract: In our study, Mg-Al-Zn mingled oxides were prepared by the co-precipitation method. The structure, composition, morphology and thermal stability of the synthesized Mg-Al-Zn mingled oxides were analyzed by powder X-ray diffraction, Fourier transform infrared spectrometry, N2physisorption, scanning electron microscopy, differential scanning calorimetry and thermogravimetry. Batch experiments were performed to study the adsorption behavior of cobalt(II) and nickel(II) as a function of pH, contact time, initial metal ion concentration, and adsorbent dose. The maximum adsorption capacity of Mg-Al-Zn mingled oxides for cobalt and nickel metal ions was 116.7 mg g-1, and 70.4 mg g-1, respectively. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models in linear and nonlinear regression analysis. The kinetic studies showed that the adsorption process could be described by the pseudo-second-order kinetic model. Experimental equilibrium data were well represented by Langmuir and Freundlich isotherm models. Also, the maximum monolayer capacity, qmax, obtained was 113.8 mg g-1, and 79.4 mg g-1for Co(II), and Ni(II), respectively. Our results showed that Mg-Al-Zn mingled oxides can be used as an efficient adsorbent material for removal of heavy metals from industrial wastewater samples.
authors.affiliation: Department of Analysis and Evaluation, Egyptian Petroleum Research Institute, Cairo, Egypt E-mail: monaelsayed2005@yahoo.com.
authors.forename: Mona
authors.initials: M
authors.lastname: El-Sayed
authors.affiliation: Department of Petrochemicals, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt.
authors.forename: Gh
authors.initials: G
authors.lastname: Eshaq
authors.affiliation: Department of Petrochemicals, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt.
authors.forename: A E
authors.initials: AE
authors.lastname: ElMetwally
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010087:Oxides; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D000535:Aluminum; D019216:Metals, Heavy; D009532:Nickel; D010087:Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015032:Zinc