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Selective Removal of Lead Ions From Aqueous Solutions Using 1,8-Dihydroxyanthraquinone (Dhaq) Functionalized Graphene Oxide; Isotherm, Kinetic and Thermodynamic Studies Publisher



Khazaei M1, 2 ; Nasseri S2, 3 ; Ganjali MR4, 5 ; Khoobi M6 ; Nabizadeh R2 ; Gholibegloo E7 ; Nazmara S2
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, P. O. Box: 14155-6446, Tehran, Iran
  3. 3. Center for Water Quality Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran
  5. 5. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
  6. 6. Department of Pharmaceutical Biomaterials and Medical Biomaterials Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
  7. 7. Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, Iran

Source: RSC Advances Published:2018


Abstract

An anthraquinone-graphene structure was fabricated and applied for the removal of lead(ii) from aqueous solution. The equilibrium occurred in about 10 min revealing the high adsorption rate at the beginning of the process. The maximum Pb(ii) adsorption capacity of the Fe3O4@DHAQ-GO nanocomposite was about 283.5 mg g-1 that was observed at 323 K and pH 5.5. The Pb(ii) adsorption ability increased with the increasing pH. The isotherm and kinetic studies indicated that the Sips isotherm model and the linear form of the pseudo-second kinetic model had a better fit with the experimental results. The positive value of ΔH0 indicated endothermic interactions between Pb(ii) and Fe3O4@DHAQ-GO. The negative ΔG0 indicated that the reactions are spontaneous with a high affinity for Pb(ii). The positive ΔS0 values indicated increasing randomness at the solid-solute interface during the adsorption process. The selective removal of Pb(ii) by the nanocomposite confirms the presence of higher-affinity binding sites for Pb(ii) than Cd(ii), Co(ii), Zn(ii), and Ni(ii) ions. Furthermore, the Fe3O4@DHAQ-GO nanocomposite revealed an excellent preferential adsorbent for Pb(ii) spiked in drinking water samples containing natural ion matrices. EDTA-2NA 0.01 N was found to be a better elution agent than HCl 0.1 M for the nanocomposite regeneration. After five adsorption/desorption cycles using EDTA-2NA 0.01 N, more than 84% of the adsorbed Pb(ii) was still desorbed in 30 min. Capturing sub-ppm initial concentrations of Pb(ii) and the capability to selectively remove lead from drinking water samples make the Fe3O4@DHAQ-GO nanocomposite practically convenient for water treatment purposes. High adsorption capacity and facile chemical synthesis route are the other advancements. © 2018 The Royal Society of Chemistry.