Abstract
Buckwheat hull, an agricultural industry waste, was used as a novel biosorbent to remove hexavalent chromium from water. The absorption kinetics was investigated by measuring the change of Cr(VI) and total chromium concentration with time. It showed that the removal of Cr(VI) by buckwheat hull followed the pseudo-second-order adsorption kinetics. Effects of pH, biosorbent dosage and initial concen- tration of Cr(VI) on its adsorption removal were also examined in the batch mode. The results showed that the buckwheat hull was very effective for removing Cr(VI) from water. At pH 2.0, load of 5.0 gL -1 , buck- wheat hull could almost completely remove Cr(VI) (99.87% of 100 mgL -1 ) from water. The removal of Cr(VI) increased with the decrease of solution pH values, and the maximum percentage removal was at- tained at pH 2.0. Increase of adsorbent dosage would raise the removal efficiency, while it would simulta- neously reduce the adsorption capacity. Moreover, the removal of Cr(VI) was found to decrease with rising the initial concentration of Cr(VI). Whereas, the Cr(VI) uptake capacity increased with the rise of Cr(VI)
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