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The modification of peanut shell by nitric acid, sodium hydroxide, and epichlorohydrin have been conducted accordingly, andapplication in the purification of high purity boric acid from industry productshave been carry out, the result indicated that modification by epichlorohydrin was more effective than by nitric acid and by sodium hydroxide in the purification which the iron ion, sulfate ion, and chloridion can be removed simultaneously from industry boric acid, the analytical result by IR, SEM, and XRD confirmed that there are amount of hydroxyl and carboxyl group and ether bound in the modified peanut shell as functional group for adsorption of various metals ion and anions.

Preparation of High Purity Boric Acid by Modified Peanut Shells