Removal of mercury (II) from aqueous solution using bamboo leaf powder: Equilibrium, thermodynamic and kinetic studies

In the present research, Homalothecium Sericeum was utilized for the first time as an effective and readily available adsorbent in removal of Hg(II) ions from aqueous solutions through a batch adsorption technique. The effects of initial solution pH, contact time, initial Hg(II) and adsorbent concentration, temperature, and ionic strengths were evaluated on the removal efficiency of Hg(II) ions, after being characterized of H. sericeum by different techniques. The maximum Hg(II) adsorption was obtained as 128.2 mg g 21 at initial pH 6.0 with an equilibrium time of 60 min, adsorbent dosage of 5.0 g L 21 and initial Hg(II) concentration range of 50-750 mg L 21 . The adsorption behaviors of Hg(II) ions onto H. sericeum were investigated in terms of kinetics (pseudofirst order, pseudo-second order, and intraparticle diffusion models), isotherms (Langmuir, Freundlich, and Dubinin Radushkevich models), and thermodynamics evaluation. Both the Langmuir and Freundlich isotherm models were found to be suitable to describe the adsorption equilibrium while the adsorption kinetics followed by the pseudo-second order model. Thermodynamic parameters including the Gibbs free energy (DG), enthalpy (DH), and entropy (DS) changes indicated that the adsorption of Hg(II) ions onto H. sericeum was feasible, spontaneous, and endothermic in nature.

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“…The linear forms of Langmuir and Freundlich isotherm models are given in Eqs. (5) and (6), respectively.…”

Section: Effect Of Initial Hg(ii) Concentration and Adsorption Isothermsmentioning

confidence: 99%

Equilibrium, kinetics, and thermodynamic evaluation of mercury (II) removal from aqueous solutions by moss (Homalothecium sericeum) biomass

Özdeş

Duran

2015

Env Prog and Sustain Energy

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“…In this case, there was a chemical bond that was formed at adsorbent surface. Pseudo second order kinetic model was also successfully applied to the kinetic adsorption of Hg by adulsa leaf powder, bamboo leaf powder and sulfurized adsorbent from agricultural waste [14,15,16]. Table 1 presents the comparison of the linear regression coefficient of Hg adsorption kinetic model using various adsorbents.…”

Section: F Intra-particle Diffusion Kinetic Modelmentioning

confidence: 99%

Kinetics of Hg and Pb Removal in Aqueous Solution Using Coal Fly Ash Adsorbent

Kuncoro

Fahmi

2014

IJPS

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AbstractThe objective of this research was to investigate the kinetics aspect of Hg and Pb adsorption using coal fly ash. A series of a Hg and Pb adsorption experiment using coal fly ash with contact time variation was carried out. The results were plotted to pseudo first order kinetic, pseudo second order kinetic and intra-particle diffusion model. High values of R2 were obtained from the plots of kinetics model for both heavy metals investigated, these values exceeded 0,8. The conclusion obtained was that Hg adsorption kinetics followed pseudo second order kinetic model while Pb adsorption kinetics followed intra-particle diffusion.

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“…The adsorption isotherm shows that adsorbate (C e ) interacts with adsorbent (q e ) at a constant temperature and reflects the nature of adsorption reaction (Mondal et al 2013).…”

Section: Isothermal Studiesmentioning

confidence: 99%

Removal of divalent nickel from aqueous solutions using Carissa carandas and Syzygium aromaticum: isothermal studies and kinetic modelling

2015

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Biosorptive removal of divalent nickel from aqueous solution using Carissa Carandas and Syzygium aromaticum was investigated in batch mode and the observations were correlated with the pH variation, agitation time, dose of the adsorbent and initial metal ion concentration in the solution. In the course of this study Sorption efficiency of C. carandas leaf powder found higher than that of S. aromaticum under identical experimental conditions. The maximum adsorption capacities estimated for Ni(II) through Freundlich isotherm model were 3.76 and 2.96 mg/g for C. carandas and S. aromaticum, respectively. In kinetic studies the correlation coefficient (R 2 = 0.99) for the pseudo-second order kinetics modal was higher than that of pseudo-first order kinetics model and the calculated value of q e for the pseudo-second order kinetic model resulted very close to the experimental value, which indicates that it fits well with the equilibrium data for Ni(II) sorption from aqueous solutions on biosorbents.

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Removal of mercury (II) from aqueous solution using bamboo leaf powder: Equilibrium, thermodynamic and kinetic studies

Cited by 103 publications

References 21 publications

Equilibrium, kinetics, and thermodynamic evaluation of mercury (II) removal from aqueous solutions by moss (Homalothecium sericeum) biomass

Equilibrium, kinetics, and thermodynamic evaluation of mercury (II) removal from aqueous solutions by moss (Homalothecium sericeum) biomass

Kinetics of Hg and Pb Removal in Aqueous Solution Using Coal Fly Ash Adsorbent

Removal of divalent nickel from aqueous solutions using Carissa carandas and Syzygium aromaticum: isothermal studies and kinetic modelling

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