Properties of Magnetic Silica Gel for Environment Monitoring
Sol-gel method allows production of effective adsorbent systems from fine SiO2 powder and magnetite. The protolytic exchange capacity of synthesized gels was studied within the pH range of 4–12. The main characteristics of the synthesized silica gel are: surface – 250–350 m2/g; density – 0.9 g/cm3; thermal stability – 900°C; sorbent capacity – 0.8–1.2 mmol-eq/g.
Synthesized silica gels have high sorption capacitance in relation to Pb2+ and Sr2+ ions and provide steep withdrawal of these ions from liquid environments. The isotherms of ion sorption on SiO2–Fe3O4 as sorbent display two steps of sorption. The first step is responsible for the main contribution to capacitance of sorption, the second step provides complete extraction of metal from depletion at the maiden stage of solution.
With increase of the chapter of magnetite in the SiO2–Fe3O4 sorbent, the sorption capacity of metals and depth of their withdrawal increases, indicating prospects to apply the data on such sorbents in geochemical research.
KeywordsSol-gel process silica gel strontium lead selective sorption sorption capacity porosity
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