Removal Of Chromium Hexavalent (cr(vi) From Aqueous Solution Using Activated Carbon Prepared From Prosopis Juliflora Plant And Find The Optimal Operating Condition For Adsorption Process.

In the present study adsorption of chromium (VI) ions from aqueous solution by activated carbonrnprepared from Prosopis Juliflora plant was investigated under batch mode. The removal ofrnhexavalent chromium was optimized by using response surface methodology. The influence ofrnvarious process parameters such as initial chromium (VI) concentration, solution pH, sorbentrndose and contact time on the removal process were investigated. A total of 30 sorptionrnexperimental runs were carried out employing the detailed conditions designed by responsernsurface methodology based on the Central Composite Design. The analysis of variancern(ANOVA) depicted that the quadratic model was suitable for the responses. Contour andrnresponse surface plots were used to determine the interaction effects of main factors andrnoptimum conditions of process, respectively. From the experimental result, maximum chromiumrn(VI) removal of 99.23 % was obtained at the optimum condition of initial chromium (VI)rnconcentration (80 mg/L), pH (1.5), adsorbent dose (10g/L) and contact time (106.79 min). Thernexperimental removal efficiency (99.23 %) agreed very well with the predicted one (99.27 %),rnindicating the suitability of the model employed and the success of response surface methodologyrnin optimizing the conditions of the removal of chromium (VI) ions from aqueous solution.rnKeywords: Response surface methodology; Prosopis Juliflora; adsorption; ANOVA; Contour

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