Abstract
A rice husk is one of agricultural wastes, but useful non-eatable biomasses because it contains 70〜75 mass% organics and about 15 mass% amorphous silica. The objective in the present study is to fabricate high-purity amorphous silica materials originated from rice husks by using citric acid leaching process, not employing the conventional strong mineral acid solutions. The GCMS analysis indicated the citric acid solution was effective for the hydrolysis reaction of cellulose and hemi-cellulose contained in rice husks, and the reactivity increased with increase in the aid concentration of the solution used in leaching. At the same time, the metal impurity contents, such as K, Ca, Mg, Al, were also reduced after citric acid leaching process due to the chelate reaction between their impurities and the carboxyl group (-COOH) of the citric acid solution. As a result, the silica materials with high-purity of 99% or more were obtained from the rice husks.
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