Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution

Li, Xiaoli; Li, Yanfeng; Ye, Zhengfang

doi:10.1016/j.cej.2011.10.012

Cited by 159 publications

(50 citation statements)

References 41 publications

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“…As the Freundlich model was characterized by 1/n, the heterogeneity factor, the values of 1/n obtained in the present work are between 0.1 < 1/n < 1.0 which represents good adsorption of metal ions. The similar behavior of Cd(II) and Pb(II) adsorption process fitting to Freundlich isotherm with exclusively involvement of ion exchange, physical sorption and chelation mechanism was reported by Pehlivan et al and Li et al [13,31]. The fact that the Freundlich isotherm fits the data in the present work may be due to heterogeneous distribution of active sites and the supply of these adsorption sites was infinite on studied biochar surface.…”

Section: Effect Of Contact Timesupporting

confidence: 85%

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Buffalo weed (Ambrosia trifida L. var. trifida) biochar for cadmium (II) and lead (II) adsorption in single and mixed system

Yakkala

Roh

et al. 2013

Desalination and Water Treatment

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A B S T R A C TBiochars (BWBC 300, BWBC 500 and BWBC 700) derived from buffalo weed (Ambrosia trifida L. var. trifida) at different pyrolysis temperatures of 300, 500 and 700˚C were investigated for the removal of Cd(II) and Pb(II) ions from aqueous solutions. The physicochemical properties of the biochars were studied using FTIR, scanning electron microscopy (SEM), X-ray diffraction, Brunauer, Emmett and Teller surface area, cation exchange capacity and energy dispersive X-ray analysis. The adsorption at solution pH = 5 could be well described by Freundlich model for Cd(II) and Pb(II) in their single and mixed system with R 2 P 0.95. The maximum adsorption capacities of the biochar BWBC 700 from the Langmuir equation were found to be 11.63 and 333.33 mg g À1 for Cd(II) and Pb(II), respectively. Pseudo-second-order kinetic model was fitted well in describing the adsorption kinetics of Cd(II) and Pb(II) onto the biochar BWBC 700. About 0.02 mol L À1 disodium salt of EDTA was able to desorb Cd(II) and Pb(II) from the biochar BWBC 700 with an approximately 63.5% and 96.8% desorption yield, respectively. Ion exchange and surface complexation found to be the main mechanisms involved in the adsorption process. The developed biochar derived from Ambrosia trifida L. var. trifida found to be a low cost adsorbent and could be used for the effective removal of Cd(II) and Pb(II) in waste waters.

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Section: Effect Of Contact Timesupporting

confidence: 85%

“…The Langmuir and Freundlich isotherms, which assumes a monolayer adsorption on a homogenous surface and a multilayer adsorption on a heterogeneous surface respectively, are the most frequently used models to represent the data of adsorption from the solution [31].…”

Section: Cd(ii) and Pb(ii) Adsorption And Desorption Studiesmentioning

confidence: 99%

Buffalo weed (Ambrosia trifida L. var. trifida) biochar for cadmium (II) and lead (II) adsorption in single and mixed system

Yakkala

Roh

et al. 2013

Desalination and Water Treatment

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“…The model has been widely used by researchers on kinetic study of metal ions adsorption onto various derived adsorbents (Rengaraj et al 2003(Rengaraj et al , 2004Li et al 2011;Argun and Dursun 2008). Batch mode experiments were carried out by varying the concentration of the metal solutions at 27 °C and at pH 3.0 for Cr(VI) metal ion and at pH 6.0 for Cd(II), Pb(II) and Ni(II) metal ions used in this study.…”

Section: Lagergren Rate Equationmentioning

confidence: 99%

Kinetic study on adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II) ions from aqueous solutions using activated carbon prepared from Cucumis melo peel

Manjuladevi¹,

Anitha²,

Manonmani³

2018

Appl Water Sci

120

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The adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II), ions from aqueous solutions by Cucumis melo peel-activated carbon was investigated under laboratory conditions to assess its potential in removing metal ions. The adsorption behavior of metal ions onto CMAC was analyzed with Elovich, intra-particle diffusion rate equations and pseudo-first-order model. The rate constant of Elovich and intra-particle diffusion on CMAC increased in the sequence of Cr(VI) > Ni(II) > Cd(II) > Pb(II). According to the regression coefficients, it was observed that the kinetic adsorption data can fit better by the pseudo-first-order model compared to the second-order Lagergren's model with R 2 > 0.957. The maximum adsorption of metal ions onto the CMAC was found to be 97.95% for Chromium(VI), 98.78% for Ni(II), 98.55% for Pb(II) and 97.96% for Cd(II) at CMAC dose of 250 mg. The adsorption capacities followed the sequence Ni(II) ≈ Pb(II) > Cr(VI) ≈ Cd(II) and Ni(II) > Pb(II) > Cd(II) > Cr(VI). The optimum adsorption conditions selected were adsorbent dosage of 250 mg, pH of 3.0 for Cr(VI) and 6.0 for Ni(II), Cd(II) and Pb(II), adsorption concentration of 250 mg/L and contact time of 180.

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“…The positive values of DS° suggested that the degrees of freedom increased at the solid-liquid interface during the adsorption. During the adsorption process, the coordinated water molecules were displaced by metal cations, resulting in increased randomness in the adsorbent-adsorbate system (Baraka et al 2007, Li et al 2011). …”

Section: δG° =δH° -Tδs-tdsmentioning

confidence: 99%

Removal of copper from copper-contaminated river water and aqueous solutions using Methylobacterium extorquens modified Erzurum clayey soil

Çelebi¹,

Nadaroğlu²,

Kalkan³

et al. 2016

Archives of Environmental Protection

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Abstract:The objective of this study was to investigate the possibility of using natural and bacteria-modifi ed Erzurum clayey soil with Methylobacterium extorquens as an alternative to high cost commercial adsorbent materials for the removal of copper from aqueous solution. The copper concentrations in the samples of the polluted river water and CuCl 2 solutions treated by the natural and bacteria-modifi ed Erzurum clayey soil (ECS) have been determined by spectrophotometric method. Firstly, the surface of ECS was modifi ed with M. extorquens and surface functionality was increased. Then, the adsorption of Cu (II) from solution phases was studied with respect to varying metal concentration, pH, and temperature and agitation time. The maximum adsorption of Cu (II) for natural and bacteria-modifi ed Erzurum clayey soil was observed at pH: 5.0. At different copper concentrations, copper adsorption analysis was performed on 1 g using clay soil or modifi ed clay soil. Maximum adsorption of Cu (II) was obtained as 45.7 and 48.1 mg g -1 at initial concentration (50 mg/50 mL) and optimal conditions by natural and bacteria-modifi ed clay soil, respectively. The copper concentration was decreased in the substantial amount of the leachates solutions of natural and bacteria-modifi ed clay soil. Langmuir and Freundlich isotherms were used to describe the adsorption behavior of Cu (II) ions. The results showed that modifi ed clay soil had a high level of adsorption capacity for copper ion. The various thermodynamic parameters such as ΔG°, ΔH° and ΔS° were analyzed to observe the nature of adsorption. The structural properties of the natural and bacteria-modifi ed-ECS have been characterized by SEM, FTIR and XRD techniques. Consequently, it was concluded that the bacteria--modifi ed clay soil could be successfully used for the removal of the copper ions from the aqueous solutions.

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Preparation of macroporous bead adsorbents based on poly(vinyl alcohol)/chitosan and their adsorption properties for heavy metals from aqueous solution

Cited by 159 publications

References 41 publications

Buffalo weed (Ambrosia trifida L. var. trifida) biochar for cadmium (II) and lead (II) adsorption in single and mixed system

Buffalo weed (Ambrosia trifida L. var. trifida) biochar for cadmium (II) and lead (II) adsorption in single and mixed system

Kinetic study on adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II) ions from aqueous solutions using activated carbon prepared from Cucumis melo peel

Removal of copper from copper-contaminated river water and aqueous solutions using Methylobacterium extorquens modified Erzurum clayey soil

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