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  • Chem Sci Trans., 2018, 7(3),  pp 445-463  

    DOI:10.7598/cst2018.1490

    Research Article

    Adsorption of Cu(II) Ion onto Activated Eupatorium Adenophorum and Acer Oblongum: Thermodynamic, Kinetic and Equilibrium Studies

  • M. C. VISHWAKARMA1, PRIYANKA TIWARI3, S. K. JOSHI2*, HARISH SHARMA2 and N. S. BHANDARI2
  • 1Department of Chemistry, L. S. M. Govt. P. G. College Pithoragarh, Uttarakhand, India
    2Department of Chemistry, Kumaun University, S. S. J. Campus Almora, Uttarakhand, India
    3Department of Chemistry, M. B. P. G. College, Haldwani, Uttarakhand, India
  • Abstract

    The performance of activated Eupatorium adenophorum (AEA) and activated Acer oblongum (AAO) biomass for removal of Cu(II) ion from aqueous solution was investigated. Adsorption was carried out by batch operation and different parameters applied were pH, contact time, temperature, adsorbent dose and initial metal ion concentration. The maximum adsorption for Cu(II) ions was found at pH 5.0. The equilibrium adsorption data were analyzed using Langmuir, Freundlich and Temkin isotherm models. The equilibrium data fitted well the Langmuir isotherm. The affinity of AEA is greater than AAO biomass. Kinetic studies were performed to understand the mechanistic steps of adsorption process. The rate kinetics for the adsorption of metal ions was best fitted with the pseudo-second-order kinetic model. The thermodynamic analysis indicated that the adsorption of Cu(II) metal ions onto AEA and AAO biomass was an exothermic process (ΔH0<0) and results in higher adsorption capacities at lower temperatures. The adsorption of Cu(II) metal ions onto AEA was more exothermic and spontaneous than AAO biosorbent. The negative value of ΔG0 revealed that the adsorption was spontaneous. The feasibility of the process is evident from the positive value of ΔS0.

    Keywords

    Metal ions, Isotherm models, Kinetics, Biosorption, Eupatorium adenophorum, AEA, Acer oblongum, AAO, biomass

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