ALUMINOSILICATES FROM RICE STRAW: OBTAINING AND SORPTION PROPERTIES
Abstract
In order to solve the problem of complex utilization of rice straw – waste of rice production – the task was to obtain from vegetable silicon-containing raw materials samples of aluminosilicates that are promising for use as highly efficient sorbents. A series of sodium aluminosilicate samples were synthesized from alkaline hydrolysates of rice straw of various strains of Far Eastern breeding, the effect of synthesis conditions on the properties of the final product was investigated. The chemical and phase composition of the samples were determined, the particle morphology was observed by scanning electron microscopy, the specific surface area was measured, the IR spectra were recorded, the thermal properties were studied, the limits of thermal stability were determined, and the products of thermal transformations were identified. The acid-base properties of the surface were investigated by the pH-metry method and the Hammett indicator method, and the distribution of active centers was determined. The dependence of the sorption capacity of the obtained aluminosilicates on rice varieties and the conditions of the extraction of silicon from the straw (the duration of alkaline hydrolysis) was established on model aqueous solutions of methylene blue. The results expand the possibilities of comprehensive utilization of agricultural wastes with obtaining valuable products and deepen knowledge about the processing biogenic silicon-containing raw materials and the sorption mechanisms of organic pollutants on aluminosilicate materials.
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