Elimination of Cr(VI) from aqueous solution by a new agro-waste material

Elimination of Cr(VI) from aqueous solution by a new agro-waste material

Şerife , Parlayıcı

The efficiency of Wheat Straw (WS) and modified Wheat Straw (MWS) in removing Cr(VI) ions from aqueous solution was studied. Batch experiments were designed to obtain Cr(VI) ion sorption data. The influences of contact time, pH, adsorbent dose and initial chromium concentration on adsorption process performance was researched and an appropriate adsorption isotherm of Cr(VI) adsorption on (WS) and (MWS) was determined. The results of this study showed that adsorption of chromium by (RWS) and (MWS) reached to equilibrium after 120 min and after that a little change of chromium removal efficiency was observed. Higher Cr(VI) adsorption was observed at lower pH and maximum Cr(VI) concentration and lower adsorbent doses. The equilibrium sorption capacity of Cr(VI) ion after 120 min was 28.6 and 81.9 mg/g for (WS) and (MWS) respectively. The investigated adsorbents showed different adsorption capacities for Cr(VI) ions. Langmuir and Freundlich isotherms have been used to characterize observed biosorption phenomena of Cr(VI) ions on (MWS). The carboxyl groups on the surface of (MWS) were primarily responsible for the sorption of Cr(VI) ions. Keywords: Sorption; Cr(VI); Agricultural by-product; Citric acid

Conference or Workshop Item
PeerReviewed

2012-05-31

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