Sorption Behaviour of Radioactive 51Cr(VI) Species on V2O5

Bhutani, M. M.; Mitra, A. K.; Kumari, Ramesh

doi:10.1524/ract.1992.56.3.153

Cited by 5 publications

(5 citation statements)

References 11 publications

(15 reference statements)

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“…The numerical value of the other Freundlich constant, K, which was computed from the intercept of the above plot was found to be 3.2 X 10"^ mol g"\ confirms a significant affinity of HMO towards cadmium ions. Such an applicability of Freundlich isotherm in the present system is similar to earlier fmdings [11,[12][13][14][15][21][22].…”

Section: Effect Of Concentrationsupporting

confidence: 87%

Inorganic Particulates in Removal of Toxic Heavy Metal Ions:* Efficient Removal of Cadmium Ions from Aqueous Solutions by Hydrous Manganese Oxide

Mishra

Tiwary

1998

Radiochimica Acta

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Hydrous manganese oxide / Cadmium ions / Freundlich adsorption isotherm / Desorption / Radiotracer / Irradiation SummaryAdsorption of cadmium ions from aqueous solutions of CdCNOj)! on hydrous manganese oxide (HMO) has been studied as a function of the contact time, concentration (10"^-10"' M), temperature (303-333 K) and pH (2.80-11.80) of the Cd(n) Solution employing 'radiotracer technique'. The results on adsorption of Cd(II) on HMO show that the removal process is essentially complete in ca. 2 h and the steady State values of adsorption at various concentrations agree well with the classical Freundlich adsorption isotherm. The temperature and pH of the bulk Solution markedly affect the extent of adsorption and the process is thermodynamically irreversible. The exposure of HMO to neutrons and y-radiations from a 11.1 GBq (Ra-Be) neutron source having 1.72 Gy/h dose rate or to a high radiation y-cell (having mean dose rate 4.66 kGy/h) has practically no significant effect on the adsorption capacity of HMO.

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Section: Effect Of Concentrationsupporting

confidence: 87%

Inorganic Particulates in Removal of Toxic Heavy Metal Ions:* Efficient Removal of Cadmium Ions from Aqueous Solutions by Hydrous Manganese Oxide

Mishra

Tiwary

1998

Radiochimica Acta

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“…The rate constant is found to be almost independent of the initial adsorbate concentration, indicating that the adsorption process follows the first order rate law. Such behaviour of adsorption processes has also been found in many cases [10,11].…”

Section: Effect Of Concentrationsupporting

confidence: 57%

Adsorption studies of zinc ions on barium titanate from aqueous solution

Guin¹,

Das²,

Saha³

2002

Radiochimica Acta

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Adsorption of Zn(II) ions on barium titanate has been studied as a function of concentration of Zn(II) (1.0 × 10 −5 -5.0 × 10 −7 M), temperature (281-313 K) and pH (4-8) of the adsorptive solution using 65 Zn tracer and γ -ray spectroscopy. The adsorption process was found to obey the first order rate law and the Freundlich adsorption isotherm for the range of concentration studied. The uptake increases from 32 to 70% with the increase in dilution (from 1.0 × 10 −5 to 5.0 × 10 −7 M). The extent of adsorption also increases with increasing temperature and pH of solution.The activation energy for the process was determined to be 12.3 kJ mol −1 . The removal of Zn(II) ions by barium titanate appears to be endothermic and irreversible.

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“…It is valid for physical adsorption and usually for an adsorbent with very heterogeneous surface, 27 Similar results were reported by other workers for the adsorption of chromium on surfaces of metal oxides and natural materials. 13,28,29 The values of 1/n and A, which are rough measures of the adsorption intensity and adsorption capacity of the sorbent respectively, have been determined by a least square fit programme and were found to be 0.86+0.06 and 2.35+0.06 retool/g, respectively.…”

Section: Effect Of Concentration Of Adsorbatementioning

confidence: 99%

“…Similar results have also been reported for the adsorption of chromium on various metal oxide surfaces. [13][14][15]28 The values ofAH 0, AS 0 were also calculated from the slope and intercept of the Vant'Hoff plot of the adsorption of chromium on rice husk, i.e., the linear variation of lnK d with reciprocal temperature 1/T (Fig. 6) using the relation:…”

Section: Effect Of the Temperaturementioning

confidence: 99%

Adsorption behavior of rice husk for the decontamination of chromium from industrial effluents

Khalid

Rahman

Ahmad

et al. 1999

J Radioanal Nucl Chem

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Rice husk, an agricultural waste product, was studied as a potential decontaminant for chromium in the effluents of leather tanning industries. Physico-chemical parameters such as selection of appropriate electrolyte, shaking time, concentration of adsorbent and adsorbate were studied to optimize the best conditions in which this material can be utilized on commercial scale for the decontamination of effluents.The radiotracer technique was used to determine the distribution of chromium. In certain cases atomic absorption spectrophotometry was also employed. Maximum adsorption was observed at 0.01 mol-dm -3 acid solutions (HNO 3, HCI, H2SO 4 and HCIO4) using 3.0g of adsorbent for 2.73 -I 0 -3 mol-dm -3 chromium concentration in five minutes equilibration time. Studies show that the adsorption decreases with the increase in the concentrations of all the acids. The adsorption data follows the Freundlich isotherm over the range of 2.73.10 -3 to 2.73.10 -2 tool dm -~ chromium concentration. The characteristic Freundlich constants, i.e., 1/n = 0.86+0.06 and A = 2.35_+0.06 mmol .g-~ have been computed for the sorption system. Thermodynamic parameters, i.e., AG ~ AS ~ and AH ~ have also been calculated for the system. Application of the method to a test case of a medium size industry showed that 21 kg of rice husk was sufficient to maintain the NEQS limits of chromium for industrial effluents.

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Sorption Behaviour of Radioactive ⁵¹Cr(VI) Species on V₂O₅

Cited by 5 publications

References 11 publications

Inorganic Particulates in Removal of Toxic Heavy Metal Ions:* Efficient Removal of Cadmium Ions from Aqueous Solutions by Hydrous Manganese Oxide

Inorganic Particulates in Removal of Toxic Heavy Metal Ions:* Efficient Removal of Cadmium Ions from Aqueous Solutions by Hydrous Manganese Oxide

Adsorption studies of zinc ions on barium titanate from aqueous solution

Adsorption behavior of rice husk for the decontamination of chromium from industrial effluents

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