Immobilizing metallic copper onto submicron silica synthesized from rice husk ash
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tiennv@hcmute.edu.vnKeywords:
Rice husk ash, submicron silica, ascorbic acid, silica-copper, in situAbstract
Rice husk is an abundant low-cost source of silica in Vietnam and copper submicron particles are extensively studied as effective antimicrobial, antifugal and catalytic material with enormous potential applications. Rice husk was washed with acidic solutions and then ashed at 700 oC. After alkaline leaching silica from the obtained ash, acidic treating with HCl solution in the presence of cetyltrimethylammonium bromide (CTAB) as surfactant yielded silica particles with submicron sizes. Metallic copper was synthesized and impregnated in situ onto silica particles using wet chemical method with CuSO4 as copper precursor and ascorbic acid as reductant. The obtained silica and silica-copper (Cu/SiO2) composite were characterized by SEM micrographs, EDX, XRD, spectroscopic methods. The obtained results confirmed the formation of submicron silica powders and metallic Cu on the surface of silica. FTIR analysis of the materials showed that some copper ions were covalently bonded with the SiO2 network and not reduced by ascorbic acid.
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