Sorption of Cr(VI) on the wood of Japanese larch treated with concentrated sulfuric acid |
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Authors: | Masakazu Aoyama Shingo Saito Masaaki Tagami |
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Affiliation: | (1) Laboratory of Bioresource Science, Department of Applied and Environmental Chemistry, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan |
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Abstract: | A carbonaceous sorbent was prepared from the wood of Japanese larch (Larix leptolepis) by dehydration with concentrated sulfuric acid in a 69% yield. The abilities of the sorbent to remove Cr(VI) from aqueous solutions were investigated. Research parameters included the initial solution pH, temperature, and initial concentration of Cr(VI) in solution. The removal of Cr(VI) was highly solution pH dependent and was mainly governed by physicochemical sorption under weak acidic conditions. The equilibrium data fit well in the Langmuir isotherm model. The Langmuir constants were calculated at different temperatures, and the sorption capacity increased with rising temperature, indicating the endothermic nature of the Cr(VI) sorption onto the sorbent. The desorption experiments suggest that the Cr(VI) sorption is generally irreversible, owing to strong interaction of HCrO 4 − with the active sites of the sorbent. |
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Keywords: | Sorption of Cr(VI) Langmuir isotherm Japanese larch wood Larix leptolepis Dehydration with concentrated sulfuric acid |
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