Extractive removal of chromium (VI) from industrial waste solution

Journal of Hazardous Materials
Archana AgrawalK K Sahu

Abstract

Extractive removal of Cr (VI) was carried out from chloride solutions using cyanex 923 mixed with kerosene. The efficiency of this extractant was studied under various experimental conditions, such as concentration of different mineral acids in the aqueous phase, concentration of cyanex 923 and Cr (VI) present in the initial aqueous feed, temperature and time of extraction, organic to aqueous (O/A) phase ratio. Percentage Cr (VI) extraction decreases with the increase in temperature at varying concentration of cyanex 923. The interference of the impurities usually associated with Cr (VI) such as Cr (III), Cu, Ni, Fe (II), Zn, Chloride and sulphate, etc., were examined under the optimized conditions and only Zn was found to interfere. Under the optimum experimental conditions 98.6-99.9% of Cr (VI) was extracted in 3-5 min at O/A of 2 with the initial feed concentration of 1g/L of Cr (VI). The extracted Cr (VI) was quantitatively stripped with 1M NaOH and the organic phase obtained after the stripping of Cr (VI) was washed with dilute HCl solution to neutralize any NaOH trapped/adhered to the solvent and then with distilled water. This regenerated solvent was reused in succeeding extraction of chromium (VI). Finally a few experim...Continue Reading

References

Dec 3, 2003·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·A OuejhaniJ F Fauvarque

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Citations

Jul 3, 2013·Environmental Science and Pollution Research International·Shanmugaprakash MuthusamyNandusha Rajarathinam
Dec 19, 2015·Journal of Environmental and Public Health·T BurksY Kiros
Feb 8, 2018·Environmental Science and Pollution Research International·Li-Juan PangGuo-Zhong Wu
Feb 10, 2020·Environmental Science and Pollution Research International·Bharti VermaChandrajit Balomajumder
Dec 7, 2021·The Science of the Total Environment·Anushka Upamali RajapakshaYong Sik Ok

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