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Preparation of Chitosan Quaternary Ammonium Salt-modified Bentonite and Its Treatment of Printing and Dyeing Wastewater |
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Abstract: Chitosan quaternary ammonium salt-modified bentonite was prepared using bentonite as raw material and chitosan quaternary ammonium salt as the modifier. The effects of preparation conditions on decolorization of printing and dyeing wastewater were investigated, and processing conditions were optimized with the orthogonal experiment. The processing effect to direct fast turquoise blue and acid orange-red was compared using modified bentonite in the treatment. The results were shown that the optimal preparation conditions that ratio of amount of bentonite and chitosan quaternary ammonium salt solution volume is 50g·L-1, the partical size is 0.150mm, the concentration of chitosan quaternary ammonium is 1.5g·L-1, microwave heating time is 7min and soaking time is 30min. With the optimal treatment conditions that pH is at 3.0, dosage of modified bentonite is 14g·L-1, mixing speed is 150r·min-1 and centrifugation time is 8min, decolorization of direct fast turquoise blue and acid orange-red are recorded as high as 94.6% and 80.3% respectively. Decolorization of direct fast turquoise blue by chitosan quaternary ammonium salt-modified bentonite is much better than that of acid orange-red by chitosan quaternary ammonium salt-modified bentonite. Above all, it was necessary to provide some scientific basis for expanding modification field and practical application of bentonite.
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Received: 21 October 2009
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