Adsorption of Cr(VI) from aqueous solutions using chitosan-coated fly ash composite as biosorbent

Wen, Yue; Tang, Zhiru; Chen, Yi; Gu, Yuexia

doi:10.1016/j.cej.2011.09.066

Cited by 143 publications

(37 citation statements)

References 26 publications

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“…The coexisting cations in aqueous solution could compete with heavy metal ions for the adsorption sites on the adsorbent (Wen et al 2011). In this study, the individual effects of coexisting cations, such as Al 3+ , Ca 2+ , Mg 2+ , Na + , and NH 4 + that are usually present in aqueous solution were investigated with the concentration of 0.1 M. Blank experiments were also conducted without coexisting cations.…”

Section: Effect Of Coexisting Cationsmentioning

confidence: 99%

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Chen

Tang

et al. 2015

Environ Sci Pollut Res

187

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Zeolite was synthesized from coal fly ash by a fusion method and was used for the removal of heavy metal ions (Pb(2+), Cd(2+), Cu(2+), Ni(2+), and Mn(2+)) in aqueous solutions. Batch method was employed to study the influential parameters such as adsorbent dosage, pH, and coexisting cations. Adsorption isotherms and kinetics studies were carried out in single-heavy and multiheavy metal systems, respectively. The Langmuir isotherm model fitted to the equilibrium data better than the Freundlich model did, and the kinetics of the adsorption were well described by the pseudo-second-order model, except for Cd(2+) and Ni(2+) ions which were fitted for the pseudo-first-order model in the multiheavy metal system. The maximum adsorption capacity and the distribution coefficients exhibited the same sequence for Pb(2+) > Cu(2+) > Cd(2+) > Ni(2+) > Mn(2+) in both single- and multiheavy metal systems. In the end, the adsorption capacity of zeolite was tested using industrial wastewaters and the results demonstrated that zeolite could be used as an alternative adsorbent for the removal of heavy metal ions from industrial wastewater.

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Section: Effect Of Coexisting Cationsmentioning

confidence: 99%

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Chen

Tang

et al. 2015

Environ Sci Pollut Res

187

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“…On the other hand, the interaction energy between adsorbed molecules (W) is lower on the AC H 2 SO 4 . tannin-immobilized activated clay [38] 24.09 chitosan-coated fly ash [39] 33.63 activated carbon prepared from apricot stone [40] 34.70…”

Section: Adsorption Of Chromium Over Different Types Of Activated Carmentioning

confidence: 99%

Valorization of agricultural waste into activated carbons and its adsorption characteristics for heavy metals

et al. 2014

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Activated carbon derived from pine cones waste was prepared by carbonization at 450 • C, activated by different activating agents: ZnCl 2 , H 2 SO 4 and NaOH, and then pyrolyzed at 600 • C. Adsorption of Cr VI and other heavy metals (Mn II, Fe II, Cu II) on activated carbons was investigated to evaluate the adsorption properties. Special attention was paid to the effects of carbon surface functionalities that were analyzed by FT-IR and zeta potential study. Moreover, XRD study of activated carbon was also carried out. Results had shown that activated carbon by NaOH was the best adsorbent for removal of chromium VI from wastewater. The solid-solution interaction was determined by analyzing the adsorption isotherms at room temperature at different pH. When pH is above 4, the removal fraction of Cr (VI) ions decreased with the increase of pH. The removal fraction of Cr (VI) ions decreased below pH 4. The preferable removal of Cu (II) over Mn(II) and Fe (II) could be due to its lower affinity to solvent.Pseudo-second order equation provided the better correlation for the adsorption kinetics data. Equilibrium isotherms were determined by Fowler-Guggenheim model.

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“…Moreover, some natural bioadsorbents such as hysterophorus weed [15], fruits of Ficus [16], pistachiohull [6], sawdust [17], and seaweed [18] were also reported to have adsorption potential for Cr(VI) removal. Generally, natural minerals and biosorbents exhibit low adsorption efficiency and limited application conditions [13,19]. Some methods including activated carbonization [20], organic polymer modification [19,21,22], acid and metal salt modifications [23] can be applied to enhance Cr(VI) adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, natural minerals and biosorbents exhibit low adsorption efficiency and limited application conditions [13,19]. Some methods including activated carbonization [20], organic polymer modification [19,21,22], acid and metal salt modifications [23] can be applied to enhance Cr(VI) adsorption. Among these, acid activation has the greatest potential because it is more cost-effective than polymer or surfactants modification, and comparing to metal salt modification, it avoids releasing other metal ions into water.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Cr(VI) removal from wastewater by adsorption onto HCl activated Akadama clay

Zhao

Chen

et al. 2015

Journal of the Taiwan Institute of Chemical Engineers

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Adsorption of Cr(VI) from aqueous solutions using chitosan-coated fly ash composite as biosorbent

Cited by 143 publications

References 26 publications

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Valorization of agricultural waste into activated carbons and its adsorption characteristics for heavy metals

Behavior of Cr(VI) removal from wastewater by adsorption onto HCl activated Akadama clay

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