Removal and Recovery of Chromium(VI) from Industrial Waste Water

Singh, Vinay Kumar; Tiwari, Preeti

doi:10.1002/(sici)1097-4660(199707)69:3<376::aid-jctb714>3.3.co;2-6

Cited by 22 publications

(23 citation statements)

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“…The enthalpy of biosorption can be calculated by many methods (Singh and Tiwari 1997;Sag and Kutsal 2000;Ö zer and Ö zer 2003). Singh and Tiwari calculated the heat of adsorption of Cr(VI) ions on carbon slurry by using the energy change (DG°=DH-TDS) and the equilibrium constant K c , obtained at different temperatures.…”

Section: Resultsmentioning

confidence: 99%

Biosorption of copper(II) from aqueous solutions by green alga Cladophora fascicularis

et al. 2006

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Biosorption is an effective means of removal of heavy metals from wastewater. In this work the biosorption behavior of Cladophora fascicularis was investigated as a function of pH, amount of biosorbent, initial Cu2+ concentration, temperature, and co-existing ions. Adsorption equilibria were well described by Langmuir isotherm models. The enthalpy change for the biosorption process was found to be 6.86 kJ mol(-1) by use of the Langmuir constant b. The biosorption process was found to be rapid in the first 30 min. The presence of co-existing cations such as Na+, K+, Mg2+, and Ca2+ and anions such as chloride, nitrate, sulfate, and acetate did not significantly affect uptake of Cu2+ whereas EDTA substantially affected adsorption of the metal. When experiments were performed with different desorbents the results indicated that EDTA was an efficient desorbent for the recovery of Cu2+ from biomass. IR spectral analysis suggested amido or hydroxy, C=O, and C-O could combine strongly with Cu2+.

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Section: Resultsmentioning

confidence: 99%

Biosorption of copper(II) from aqueous solutions by green alga Cladophora fascicularis

et al. 2006

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“…The biosorption heat can be calculated using various methods (Singh and Tiwari, 1997;Sag and Kutsal, 2000;Özer et al, 2003). Singh and Tiwari calculated the heat of adsorption of Cr (VI) ions on a carbon slurry by using energy change ( G 0 = H 0 − T S 0 ) and the equilibrium constant, K c , obtained at different temperatures.…”

Section: The Biosorption Heats Of Cu 2+ and Pb 2+ Onto C Fascicularismentioning

confidence: 99%

Biosorption of copper (II) and lead (II) from aqueous solutions by nonliving green algae Cladophora fascicularis: Equilibrium, kinetics and environmental effects

Deng

et al. 2006

Adsorption

115

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Biosorption of Cu 2+ and Pb 2+ by Cladophora fascicularis was investigated as a function of initial pH, initial heavy metal concentrations, temperature and other co-existing ions. Adsorption equilibriums were well described by Langmuir and Freundlich isotherm models. The maximum adsorption capacities were 1.61 mmol/g for Cu 2+ and 0.96 mmol/g for Pb 2+ at 298 K and pH 5.0. The adsorption processes were endothermic and biosorption heats calculated by the Langmuir constant b were 39.0 and 29.6 kJ/mol for Cu 2+ and Pb 2+ , respectively. The biosorption kinetics followed the pseudo-second order model. No significant effect on the uptake of Cu 2+ and Pb 2+ by co-existing cations and anions was observed, except EDTA. Desorption experiments indicated that Na 2 EDTA was an efficient desorbent for the recovery of Cu 2+ and Pb 2+ from biomass. The results showed that Cladophora fascicularis was an effective and economical biosorbent material for the removal and recovery of heavy metal ions from wastewater.

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“…Rate of sorption was attained by following total chromium concentration in the aqueous solution during the experiment. Two models have been proposed to express the mechanism of chromium sorption onto the carbonaceous sorbent: a pseudo first-order kinetic model of Lagergren (Singh and Tiwari, 1997) and a pseudo second-order kinetic model (Ho and Mckay, 1999;Gundogan et al, 2004) that are given in Eqs. (2) and (3) respectively.…”

Section: Kinetics Of Reduction and Sorptionmentioning

confidence: 99%

Behaviour of Reduction–Sorption of Chromium (Vi) from an Aqueous Solution on a Modified Sorbent from Rice Husk

El-Shafey

2005

Water Air Soil Pollut

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A carbonaceous sorbent produced from rice husk via sulphuric acid treatment was used to remove Cr(VI) from aqueous solutions varying contact time, pH, Cr(VI) concentration and sorbent status (wet and dry). Cr(VI) was removed from the aqueous solution via reduction to Cr(III) and sorption. Reduction and sorption processes were investigated in terms of kinetics and equilibrium. The rate of reduction removal of Cr(VI) at pH 2 followed a pseudo first-order model while the rate of sorption of total chromium followed pseudo second-order model. Chromium sorption was highly dependent on the initial pH value with reduction taking place in solution with pH up to 7 showing sorption maxima in the pH range 1.8-2.8 for concentration range 100-500 mg/l with an increase in the equilibrium pH. Carbon dioxide evolved from the sorption media was determined. Reductionsorption mechanism was investigated via physicochemical tests including cation exchange capacity, base neutralization and sorbent acidity in addition to FTIR studies for sorbent samples before and after sorption reaction.

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Removal and Recovery of Chromium(VI) from Industrial Waste Water

Cited by 22 publications

References 0 publications

Biosorption of copper(II) from aqueous solutions by green alga Cladophora fascicularis

Biosorption of copper(II) from aqueous solutions by green alga Cladophora fascicularis

Biosorption of copper (II) and lead (II) from aqueous solutions by nonliving green algae Cladophora fascicularis: Equilibrium, kinetics and environmental effects

Behaviour of Reduction–Sorption of Chromium (Vi) from an Aqueous Solution on a Modified Sorbent from Rice Husk

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