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Optimization of Process Parameters using Response Surface Methodology (RSM): Removal of Cr (VI) from Aqueous Solution by Wood Apple Shell Activated Carbon (WASAC)

Author Affiliations

  • 1Department of Chemical Engineering, Motilal Nehru National Institute of Technology, Allahabad-211004, UP, INDIA

Res.J.chem.sci., Volume 3, Issue (7), Pages 31-37, July,18 (2013)


Industries like tannery, electroplating, textiles etc. have large quantities of heavy metal ions in their effluents which are toxic for human beings. Present paper deals with the study of Cr (VI) removal from aqueous solution by wood apple shell activated carbon (WASAC) using batch experiment. The effect of different process parameters like pH, agitation time, adsorbent dosage and initial concentration were determined. The final filtrate of Cr (VI) solution was analyzed by photo-spectrometer with a wavelength of 540 nm. Initially the process parameter was set at an optimum value of pH 2 and max agitation speed of 140 rpm, further WASAC dosage, Cr (VI) initial concentration and agitation time were optimized for their combined effect using Response Surface Method (RSM). RSM method obtained a correlation between these factors and maximum removal of 98% Cr (VI) was achieved at 500 mg of adsorbent dosage (in 50 ml solution), 176.2 min of agitation time and 95.67 mg/L of Cr (VI) concentration, respectively. This investigation results revealed that WASAC can be used as an alternative adsorbents for removal of Cr (VI from aqueous solution. Moreover, wood apple shell is abundantly available in nature and hence economical for heavy metal removal.


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