Abstract
The use of microwave radiation for drying wet silicic acid gels significantly shortens the time of preparation of dry gels, or xerogels. The specific surface area of xerogels increases from 492 to 963 m2/g as the power of microwave radiation is increased from 300 to 1000 W. The effect of microwave radiation on the rate of heterogeneous reactions with the participation of analytical reagents incorporated into silicic acid xerogels was studied. It was found that, in a microwave field of a power of 600 W, the reactions between immobilized Bromobenzothiazo and cadmium, immobilized 1-(2-pyridylazo)-2-naphthol and cobalt(II), and immobilized phosphomolybdic heteropoly acid and hydrazine are essentially accelerated. For the reaction of cobalt(II) with 1-(2-pyridylazo)-2-naphthol incorporated into xerogel, microwave radiation accelerates both the outside and inside diffusion. The use of microwave radiation shortens the time of determining metal ions and hydrazine by solid-phase spectrophotometry.
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Morosanova, E.I., Velikorodnyi, A.A., Zolotov, Y.A. et al. Modifying Silicic Acid Xerogels and Accelerating Heterogeneous Reactions with Their Participation with the Use of Microwave Radiation. Journal of Analytical Chemistry 55, 1136–1141 (2000). https://doi.org/10.1023/A:1026654701709
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DOI: https://doi.org/10.1023/A:1026654701709