Abstract
A method is advanced to prepare SnO2@MCC composites in the course of hydrolysis of flax cellulose fiber by SnCl2-containing 10% aqueous nitric acid. The thus-prepared SnO2@MCC composites have a tin dioxide average crystallite size of 3.8 nm. SnO2@MCC pyrolysis under an inert atmosphere yield carbon composites SnO2@C and SnO2/Sn@C. The physical and chemical properties of the prepared samples were studied by IR spectroscopy, X-ray diffraction, electron microscopy, nitrogen adsorption, and thermogravimetry. SnO2@MCC pyrolysis at 500°C was found to yield carbon composite SnO2@C. Temperature elevation to 800°C favors SnO2/Sn@C composite formation. The carbothermic reduction of tin dioxide involves the formation of metastable SnO starting at 679.8°C; stable crystalline tin is observed to form starting at 784.5°C. The specific surface area of SnO2/Sn@C carbon composites is 110 m2/g.
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