207 Removal of chromium (VI) from the aqueous solution using immobilized persimon tannin by adsorption and reduction

Abstract

The removal of chromium (Cr(VI)) from the aqueous Cr (VI) solution by adsorption and reduction using immobilized persimmon tannin was examined. Most of the Cr (VI) was removed by adsorption using immobilized persimmon tannin. However, a part of the Cr (VI) was reduced to Cr (ni) by immobilized persimmon tannin and was passed through the column. Most of the Cr (VI) adsorbed couldn't desorbed by the alkali solution, such as sodium carbonate and sodium hydroxide. However, half amount of the Cr (III) adsorbed was desorbed using 0.1M HNO_3 solution.