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THE SORPTIONBEHAVIOR OF BORIC ACID ONWEAK-BASE ANIONEXCHANGE RESIN

Henton Huang, Chih-Wei Hsiang, Shui‐Cheng Lee, Gann Ting

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Abstract

The sorption isotherns of boric acid on WA-21 weak-base anion exchange resin and the sorption band shape as veil as its migration velocity in a four-inch diameter ion-exchange column were studied. The isothems show S-shapes with gentle slope at both low concentration and high concentration regions. In the band migration study, it has been found that these S-shaped isotherns affected the velocities of the peak maximum as the band migrated along the column. The velocities could be calculated with the simple solute movement equation. These results suggest that sorption of nolecular species, rather than ion exchange of the counter ions is the main process that occurs inside the pores of a weak-base ion-exchange resin which is in contact with a very weak electrolytic solution, such as that of boric acid.

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What this paper is about

The sorption isotherns of boric acid on WA-21 weak-base anion exchange resin and the sorption band shape as veil as its migration velocity in a four-inch diameter ion-exchange column were studied. The isothems show S-shapes with gentle slope at both low concentration and high concentration regions. In the band migration study, it has been found that these S-shaped isotherns affected the velocities of the peak maximum as the band migrated along the column. The velocities could be calculated with the simple solute movement equation. These results suggest that sorption of nolecular species, rather than ion exchange of the counter ions is the main process that occurs inside the pores of a weak-base ion-exchange resin which is in contact with a very weak electrolytic solution, such as that of boric acid.

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Available abstract

The sorption isotherns of boric acid on WA-21 weak-base anion exchange resin and the sorption band shape as veil as its migration velocity in a four-inch diameter ion-exchange column were studied. The isothems show S-shapes with gentle slope at both low concentration and high concentration regions. In the band migration study, it has been found that these S-shaped isotherns affected the velocities of the peak maximum as the band migrated along the column. The velocities could be calculated with the simple solute movement equation. These results suggest that sorption of nolecular species, rather than ion exchange of the counter ions is the main process that occurs inside the pores of a weak-base ion-exchange resin which is in contact with a very weak electrolytic solution, such as that of boric acid.

Key concepts: Boric acid, Sorption, Chemistry, Ion exchange, Ion, Base (topology), Weak base, Electrolyte

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