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Study on adsorption of copper (ⅱ) from aqueous solution by fermented corn straw

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Document pages: 6 pages

Abstract: Corn straw is the most abundant and cheapest organic raw material in Heilongjiang Province, China. This resource is harmful and causes environmental pollution. In this study, Aspergillus niger was used to ferment corn straw to prepare adsorbent. The effects of water content ratio, initial pH medium, temperature and time on fermentation were studied. Through factor analysis and orthogonal test, the optimum conditions for the production of cellulose were determined as follows: the solid-liquid ratio was 1   the temperature was 28 ℃ and the initial pH value was 72 hours. The modification mechanism was studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Under the same conditions, the biosorption capacity of fermented corn straw was better than that of raw corn strawons, and this improvement can be ascribed to the enzyme system secretion by A. niger under changing the surface properties of the raw corn stalk. Some of the hydroxyl and carboxyl groups are bounded by cellulose which became free hydroxyl and carboxyl groups with a high ability after adsorption of heavy metals.

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