糖導入型ポリアリルアミンのホウ素吸着特性

Abstract

A boron adsorption material for treating wastewater containing boron was synthesized from various types of saccharides and polyallylamine resin. The adsorption properties of boron were investigated by the batch and column methods using model wastewater. In the synthetic reaction for the D(+)-mannose-type polyallylamine resin, the optimum mole ratio of D(+)-mannose to one unit of polyallylamine was 1.0. Furthermore, the optimum reaction time and temperature of the synthetic reaction were found to be 24 hours and 35°C, respectively. The amount of boron adsorbed on the D(+)-mannose-type polyallylamine resin exceeded 0.5 mM·g-1 in the pH range of 2-12, and boron could be effectively adsorb onto the D(+)-mannose-type polyallylamine resin from model wastewater. At the optimum pH of 8.5, the maximum quantity of boron adsorbed was 2.06 mM·g-1. The adsorption isotherm of boron on the D(+)-mannose-type polyallylamine resin follows Freundlich's equation in the equilibrium concentration range from 0.045 mM·l-1 to 15.0 mM·l-1 at 25°C. When a feed solution containing 2.0 mM·l-1 boron was pumped into the D(+)-mannose-type polyallylamine resin column, the volume of effluent containing less than 0.02 mM·l-1 boron was about 311 times the bed volume, which was about 3.3 times the column of Amberlite IRA-743. The boron that was adsorbed on the D(+)-mannose-type polyallylamine resin column was easily eluted with a 1.0 M·l-1 hydrochloric acid solution, and the elution ratio was 100.6% of the adsorbed boron on the column.