REMOVAL OF Bi(III) IONS BY PHYTIC ACID DERIVATIVES FROM RICE BRAN

Abstract

Creation of new multifunctional materials based on renewable raw materials is a major direction in recent years. Large-tonnage waste of rice production (husk, straw, bran) of the Far East is a promising raw material base for obtaining such materials. Composition of rice bran includes inositol hexaphosphoric acid and its derivatives (phytin, phosphoinositol) which are capable of chelating polyvalent metal ions. Bismuth (III) is one of natural water pollutants that come from leaching of bismuth-containing minerals and activities of pharmaceutical and perfume industries. The goal of this work is to study removal conditions of bismuth (III) ions from aqueous solutions of a phytic acid derivative obtained from rice bran. It is shown in the work that with a sorbent: solution ratio of 1: 100, bismuth ions are removed from the solution by 89 %. It was found that removal of bismuth cations depends on the initial concentration (3.17–51.90 mg/l) and varies from 13 to 96 %. A comparative analysis also showed that chromium (III) ions are removed from aqueous solutions by a phosphorus-containing product better than bismuth (III) ions. These studies allow us to give recommendations on the choice of materials for treating solutions from heavy metal ions, expanding the range of currently used natural sorbents based on plant materials and solving at the same time an urgent environmental and economic problem - the disposal of rice production wastes.