Preparation of chitosan supported by modified bentonite and its discoloration with printing and dyeing wastewater

The preparation of chitosan supported by modified bentonite and the optimum conditions on its decoloration with printing and dyeing wastewater were studied. The results showed that the concentration of modified sulfuric acid was lmol/L, and the determination of mass ratio between bentonite and chitosan when supported was 0.03g/g. When dealing with printing and dyeing wastewater, the best conditions were when the shaking rate at 150r/min, the temperature at 30°C, pH value at 6, with the dosage of chitosan supported by modified bentonite at 0.006g per milliliter wastewater, and under this condition the discoloration rate with printing and dyeing wastewater reached 90.5%.