Modification of diatomite with aluminum compounds and the possibility of its applying for water purification
Journal Title: Scientific Annals of the Danube Delta Institute - Year 2014, Vol 20, Issue
Abstract
The paper investigates the possibility of applying of local modified diatomite (DMA) for different purposes. By modifying of the diatomite surface with a variety of active groups it is possibly giving it a selective properties with respect to a particular pollutant in the water, which must be removed. The structural and chemical surface modification method of diatomite surface with aluminum compounds to increase its adsorptive capacity with respect to fluorine has been used in the paper. The method consists of successive treatment of diatomite with sodium hydroxide solution under heating, aluminum salt and ammonia under constant agitation. Physic -chemical and adsorptionstructural properties of the modified diatomite have been characterized using X-ray analysis method, DTA, FTIR, BET, chemical analysis. The selectivity of the synthesized sorbent has been tested by removing of fluoride from the model solution. The effect of the sorbent mass, pH, agitation speed, the initial concentration of the sodium fluoride solution and contact time of the solution with the sorbent have been investigated. Fluorine adsorption isotherms have been obtained, which were modeled by equations by Langmuir and Freundlich. The parameters of the equations have been calculated. Kinetic curves of sorption of fluoride on DMA have been constructed. The constants of adsorption velocity have been calculated, the coefficients of internal and external diffusion have been evaluated.
Authors and Affiliations
DATSKO Tatiana, ZELENTSOV Veacheslav
Keywords
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