Synthesis and adsorption properties of polymeric and polymer-based hybrid adsorbent for hexavalent chromium removal

Duranoğlu, Dilek; Kaya, Ismet Gul Buyruklardan; Beker, Ülker; Şenkal, Bahire Filiz

doi:10.1016/j.cej.2011.11.028

Cited by 61 publications

(27 citation statements)

References 36 publications

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“…The initial sorption rates (h) are relatively high, however, small values of k 2 constant rate may be connected with the longer time required to reach the equilibrium state. Similar results were reported by several authors, however a good fitting did not illustrate the real nature of rate-limiting step [22,35,36].…”

Section: Kinetic Study Of Cr (Vi) Removal By Anionic Resinssupporting

confidence: 91%

Chromium (VI) removal from aqueous solutions by purolite base anion-exchange resins with gel structure

Balan

Volf

Bı̂lbă

2013

CI&CEQ

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The removal of Cr (VI) from aqueous solution using two strong base anionic resins with gel structure, purolite A-400 (styrene-divinylbenzene matrix) and purolite A-850 (acrylic matrix) was investigated using a batch technique. The sorption efficiency was determined as a function of phases contact time, solution pH, resin dose, temperature and initial Cr (VI) concentration. The percentage of Cr (VI) removed reached maximum values (up to 99%) in the pH range 4.0-5.3 at a resin dose of 6 g/L and Cr (VI) concentration up to 100 mg/L. An increase in temperature had a positive effect on the Cr (VI) sorption process. The equilibrium sorption data were fitted with the Freundlich, Langmuir and Dubinin-Radushkevich isotherm models, using both linear and nonlinear regression methods. The Langmuir model verified the experimental data very well and gave a maximum sorption capacity of 120.55 and 95.82 mg Cr (VI)/g for the A-400 and A-850 resins, respectively. The thermodynamic study and mean free energy of sorption values calculated using Dubinin-Radushkevich equation indicated the sorption is a chemical endothermic process. The kinetic data were well described by the pseudo-second order kinetic equation and the sorption process is controlled by external (film) diffusion and intraparticle diffusion.

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Section: Kinetic Study Of Cr (Vi) Removal By Anionic Resinssupporting

confidence: 91%

Chromium (VI) removal from aqueous solutions by purolite base anion-exchange resins with gel structure

Balan

Volf

Bı̂lbă

2013

CI&CEQ

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“…The NaOH of various mass fractions and NaOH mixed with NaCl were used to release the adsorbed Cr (VI) from DEX-Cr. Every 2 mL eluent was added to 0.2 g exhaused resin for 2 h with thermostatic shaking at temperature 35 C. Elution efficiency was calculated according to the concentration of Cr (VI) in desorption solution and the saturated adsorption capacity of resins [15,16].…”

Section: Resin Regeneration Experimentsmentioning

confidence: 99%

Cr (VI) removal by a new type of anion exchange resin DEX-Cr: Adsorption affecting factors, isotherms, kinetics, and desorption regeneration

Liu

Wang

et al. 2014

Environ. Prog. Sustainable Energy

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The adsorption of Cr (VI) by an anion exchange resin of DEX‐Cr, which contains tertiary and quaternary amine groups, was studied under varying experimental conditions that include pH, resin amount, contact time, and temperature. Batch‐shaking experiments were conducted to evaluate the performance of DEX‐Cr in removing Cr (VI). The ion‐exchange process indicated that the maximum removal could be achieved at pH of 3 and an initial Cr (VI) concentration of 2200 mg/L. The results of adsorption equilibrium experiments fit well with Freundlich isotherm, showing that the adsorption was a multilayer process. Thermodynamic parameters indicated that the uptake of Cr (VI) by DEX‐Cr was spontaneous and endothermic. Kinetic experimental data followed the pseudo first‐order equation. The desorption study revealed that adding NaCl to NaOH solution helped to improve elution efficiency dramatically. The elution results had a relationship with the mass fraction of NaCl to NaOH, higher mass fraction contributed to higher elution efficiency. The elution efficiency improved slightly with the number of times of desorption increasing, which indicates that the resin had potential in cyclic utilization. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 387–393, 2015

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“…Macroporous polymeric adsorbents are widely applied in the fields of natural products extraction, wastewater treatment and rare metal recovery due to their excellent physicochemical stability, large equilibrium adsorption capacity, excellent selectivity and structural diversity [1][2][3][4]. Since the pioneering reports of the early 1960s [5], various methods for preparation of the macroporous polymeric adsorbents have been extensively pursued [6,7].…”

Section: Introductionmentioning

confidence: 99%

Chemical modification of Amberlite XAD-4 by carbonyl groups for phenol adsorption from wastewater

Sun

et al. 2013

Chemical Engineering Journal

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Synthesis and adsorption properties of polymeric and polymer-based hybrid adsorbent for hexavalent chromium removal

Cited by 61 publications

References 36 publications

Chromium (VI) removal from aqueous solutions by purolite base anion-exchange resins with gel structure

Chromium (VI) removal from aqueous solutions by purolite base anion-exchange resins with gel structure

Cr (VI) removal by a new type of anion exchange resin DEX-Cr: Adsorption affecting factors, isotherms, kinetics, and desorption regeneration

Chemical modification of Amberlite XAD-4 by carbonyl groups for phenol adsorption from wastewater

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