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Rice hull is an important biomass energy. Biomass is the only energy which can be both renewable and  stored and transported.
2Â¥2009-05-27 16:36:29
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Biomass generated by photosynthesis every year in the world has 120 billion tons, and only 1% of which is employed as energy.However, biomass supplies 14% of power source for the wold. Rice hull which is one of the main by-product of grain processing takes up above 360 million tons every year in our contry. Furthmore, it is a renewable resource with low price which is largely and widely planted.
3Â¥2009-05-27 16:47:56
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Rice hull contains four constituents primarily: namely 20% of hemicellulose, 38% of cellulose, 19% of lignin and 18% of rice hull silicon. Currently, the rice hull is exploited with low efficiency in our country, even the main pollution source of some enterprises. Therefore, how to exploit rice hull sufficiently and increase in value is a considerable problem. Investigating a reasonable way to utilize rice hull has significant meanings for promoting further processing of our agricultural products, raising the income of a majority of farmers, changing waste into valuable and reducing pollution problems.
5Â¥2009-05-27 17:08:06
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Based on the above situations, this paper introduces a method for preparing lignin/SiO2 composite, adopting rice hull as the raw material, stewing it first and then co-precipitated under hydrothermal conditions.
6Â¥2009-05-27 17:16:04
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Based on the above background, the rice hull which was cooked first was used as initial material and, then lignin/SiO2 composite was prepared primary coprecipitation at hydrothermal condition. The result indicated that lignin/SiO2 could be prepared by coprecipitation method from filtrate at mild reaction conditions, and the particle size and ratio of lignin and SiO2 of lignin/SiO2 could be modified by the control of solution pH value. The correlative tests indicated that composition of lignin and SiO2 was not simple mixture but function of chemical bond.
8Â¥2009-05-27 17:28:22
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chtdwy(½ð±Ò+10,VIP+0): 5-27 18:04
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The results show that preparing lignin/SiO2 from filtrate by co-precipitation allows a more mild conditions. Controlling the pH of the solution can easily obtain a controllable particle size and lignin/SiO2 composite with controllable proportion.  Related tests show that the complex of lignin and SiO2 is not simply blended but an effect among chemical bonds.
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9Â¥2009-05-27 17:31:05
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