EXTRACTION OF Al3+, Pb2+, Cd2+ AND Sr2+ IONS WITH A PHOSPHORUS-CONTAINING PRODUCT FROM RICE FLOUR

Abstract

Materials of natural origin can serve as raw materials for the production of environmentally friendly inexpensive polyfunctional materials with a wide range of applications. Agricultural waste from rice production (rice husks, straw and flour) can serve as a source of such substances. In this work, the process and conditions for the extraction of aluminum, lead, strontium and cadmium ions from aqueous solutions by an organophosphorus product (derivative of inositol hexaphosphoric, phytic acid) obtained from rice flour production waste are studied. Phytic acid and its derivatives are highly effective ligands capable of chelating metal cations, which allows them to be considered as a natural material suitable for removing heavy metal ions from aqueous solutions. The degree of extraction of aluminum ions reaches 97%, lead and strontium – 89%, and cadmium – 93%. It is shown that the absorption decreases in the series Cr3+ > Al3+ > Bi3+ (from 13.0 mg/g to 4.9 mg/g) and Cd2+ > Pb2+ > Sr2+ (from 8.9 mg/g to 7.5 mg/g). These studies allow us to offer a fundamental possibility of using a natural phosphorus-containing compound as an environmentally friendly sorbent.