Equilibrium and kinetic adsorption study of the adsorptive removal of Cr(VI) using modified wheat residue

Chen, Suhong; Yue, Qinyan

doi:10.1016/j.jcis.2010.05.057

Cited by 222 publications

(96 citation statements)

References 42 publications

(42 reference statements)

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“…Since higher chromium removal occurred at acidic pH and since the real chromium samples had acidic pH in nature, there was no need to lower the pH (7). This result was in agreement with the reports by Zhao et al (17) and Chen et al (14). Figure 4 shows the effect of adsorbent dose on removal of Cr (VI) at pH 2.0 and initial Cr (VI) concentration of 5 mg/L for 90 minutes.…”

Section: Characterization Of Fire Claysupporting

confidence: 92%

“…Based on Figure 5 and Table 1, it is observed that the correlation coefficients (R 2 ) of pseudofirst-order model was 0.98, which was better than that of pseudo-second-order model, indicating that the pseudofirst-order equation fitted very well to the adsorption process. Nevertheless, a different phenomenon was observed in Cr (VI) adsorption by the modified wheat residue, micro-vesicular volcanic rocks and natural Akadama clay (14,17,19).…”

Section: Effect Of Contact Time and Kineticsmentioning

confidence: 90%

“…The heterogeneity arose due to different functional groups on the surface and various adsorbent-adsorbate interactions (14,15). The Linearizing equation Freundlich isotherm was expressed by the following Equation 7: (7) logqe = logk f + 1 n logCe where K f and n were Freundlich constants showing the adsorption capacity (mg/g) and intensity, respectively, computed by the plot of Log q e versus Log C e .…”

Section: Isotherm Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Hexavalent Chromium Adsorption onto Fire Clay

Rahmani¹,

Foroughi²,

Noorimotlagh³

et al. 2016

Avicenna J Environ Health Eng

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Cr (VI) as an extremely soluble and highly toxic ion is present in effluents of industries and imposes severe health-related problems. The current study aimed to provide information on Cr (VI) adsorption potential of fire clay as an abundant, cost-effective and untried material. Batch adsorption trials of Cr (VI) were performed to investigate the effects of pH, contact time, initial metal ion concentration and the adsorbent dosage. Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were used to evaluate the equilibrium data at 20°C and regression coefficients were derived. Moreover, adsorption kinetics was analyzed using the pseudo-first-order and the pseudo-second-order kinetic models. Maximum chromium removal was found at pH 2.0. A kinetic study yielded an optimum equilibrium time of 90 minutes with an adsorbent dose of 2.5 g/50 mL. Results suggested that the equilibrium adsorption described by the Freundlich model. The kinetic data of the sorption showed that the pseudo second-order equation was the more appropriate. The results of the study indicated that fire clay was not a suitable adsorbent for Cr (IV). Apart from relatively long equilibrium time, the efficiency was not satisfactory. Therefore, searching for better alternative and/or modify such adsorbent is necessary in this area.

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Section: Characterization Of Fire Claysupporting

confidence: 92%

Section: Effect Of Contact Time and Kineticsmentioning

confidence: 90%

Section: Isotherm Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Hexavalent Chromium Adsorption onto Fire Clay

Rahmani¹,

Foroughi²,

Noorimotlagh³

et al. 2016

Avicenna J Environ Health Eng

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“…At zero point charge, the pHzpc is the characteristic that determines the pH at which the adsorbent surface has net electrical neutrality. It is also where the acidic or basic functional groups no longer contribute to the pH of a solution [33]. At pH values above the ZPC, the surface has a net negative or anionic charge, and the surface would take part in cation attraction, as well as cation exchange reactions.…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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“…The mechanism of adsorptive removal of Cr(VI) using ACLL can be studied and evaluated by obtaining characteristic constants of sorption of Cr(VI) using first-order and second-order kinetic models. Elovich equation was successfully applied to describe an aqueous-phase adsorption of Cr(VI) onto ACLL (Chen et al 2010).…”

Section: Sorption Kinetic and Equilibrium Isotherm Modelsmentioning

confidence: 99%

Adsorption of hexavalent chromium onto activated carbon derived from Leucaena leucocephala waste sawdust: kinetics, equilibrium and thermodynamics

Malwade

Lataye

Mhaisalkar

et al. 2016

Int. J. Environ. Sci. Technol.

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The adsorptive removal of Cr(VI) was studied using activated carbon derived from Leucaena leucocephala (ACLL). The physico-chemical properties of ACLL were determined using proximate analysis and N 2 BET surface area analysis. The N 2 BET surface area of ACLL was determined to be 1131 m 2 g -1 . The point of zero charge (pH pzc ) of 5.42 indicated that ACLL surface was positively charged for pH below the pH PZC , attracting anions. The effect of experimental operating parameters such as time of contact, ACLL dose, pH, initial concentration and temperature was investigated. The optimum values of parameters such as concentration of 100 mg L -1 , 300 mg of ACLL dose, time of contact of 60 min, pH of 4 indicated the maximum Cr(VI) uptake of 13.85 mg g -1 . The pseudo-second-order kinetic model best fitted with the Cr(VI) adsorption data. Adsorptive removal of Cr(VI) onto ACLL satisfactorily fitted in the order of Redlich-Peterson [ Freundlich [ Langmuir [ Temkin adsorption isotherm model. The thermodynamic parameters showed the adsorption of Cr(VI) onto ACLL was an endothermic and spontaneously occurred process.

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Equilibrium and kinetic adsorption study of the adsorptive removal of Cr(VI) using modified wheat residue

Cited by 222 publications

References 42 publications

Hexavalent Chromium Adsorption onto Fire Clay

Hexavalent Chromium Adsorption onto Fire Clay

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Adsorption of hexavalent chromium onto activated carbon derived from Leucaena leucocephala waste sawdust: kinetics, equilibrium and thermodynamics

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