壳聚糖/粉煤灰复合材料吸附活性红研究

Application of Chitosan-Fly Ash Composites for the Removal of Reactive Red

利用正交试验法研究壳聚糖/粉煤灰复合材料处理活性红模拟印染废水的工艺条件,结果表明影响因素的大小顺序为:复合材料的配比>pH值>投加量>反应温度>搅拌时间,最适宜的操作工艺条件,即用0.1000 g的复合材料(1∶5)处理60 mL 100 mg/L活性红模拟印染废水,在pH值为4.0,35℃下搅拌5 min后脱色率可达94.52%。复合材料对活性红模拟印染废水的吸附遵循Langmuir等温吸附式和准一级速率方程。壳聚糖/粉煤灰复合材料可以重复使用,重复7次后,脱色率仍可达90.75%,可回收91.12%的活性红。

Different types of chitosan/fly ash composites were used for the adsorption of simulated dyeing wastewaters containing reactive red by the orthogonal experiment. The results indicated that the effect on the removal reactive red was in the following order： type of composite materials 〉 pH value 〉 composite dosage 〉 treating temperature 〉 stirring time. Under the optimum conditions as the following： 0.1000 g of composite （1 ： 5） processing 60 mL 100 mg/L simulated dyeing wastewaters containing reactive red, the pH value of 4.0, under 35 ℃ stirring for 5 min, the decolorization rate got up to 94.52%. The adsorption behaviors of the nanocomposite showed that the adsorption kinetics and isotherms were in good agreement with pseudo-first-order equation and the Langmuir equation, respectively. The decolorization rate for reactive red reached 90.75% and 91.12% of reactive red could be retrieved as the comoosite was recycled for seven times.