Removal and Recovery of Chromium(III) in an Aqueous Solution by Chelating Resins Containing Hydrazide Groups

Abstract

For the purpose of removal of chromium(III) from an aqueous solution, the adsorption behavior of chromium(III) on some chelating resins was tested by batch and column methods. A macroreticulcahr elatingre sin(RMH) containing hydrazide groups was found to be useful for our purpose. In the batchm ethod, the RMH showeda good affinty for chromium(III) in the pH range of 5.8∼57. The adsorptioonf chromium(III) on the RMH was not influenced by the presenceo f Ca²⁺ over the concentration range of 0.01∼0.1 mol/l. In the column method, chromium(III) in an aqueous olution was favorablayd sorbed on the RMH, whent the chromium nitrates solution( pH3.8 ) containing either 1mg/l or 10mg/l of chromiim (III)was passed through the RMH olumn at the spacev elocity(SV) of 15h^-1. Chromium(III) adsorbed on the RMH column was effectively eluted by passing 20 bed volumes of 4 mol/l sodium hdiroxide solution overt he resinat the SV of 7.5h^-1.