质子化壳聚糖/磁性复合材料对含磷污水中磷的吸附特性

采用反相悬浮交联法制备出质子化壳聚糖/Fe_3O_4磁性复合吸附剂,研究了其对模拟含磷污水中磷的吸附特性。首先,考察了吸附时间对所有复合吸附剂的吸附特性的影响;选取其中吸附特性较好的E2吸附剂,考察了其吸附特性与含磷溶液初始浓度的关系;然后,进行了与溶液pH值、吸附剂类别、投加量、吸附时间、溶液初始浓度相关的正交试验。研究结果表明,原水pH值对吸附过程具有最明显的影响,最佳pH值为6,吸附剂和投加量的影响次之,影响最弱的是初始浓度和吸附时间。质子化磁性壳聚糖对磷的去除率最高达80%左右。吸附动力学研究结果表明,吸附过程能很好地符合Lagergren准二级动力学模型,由此证明吸附过程为化学吸附。

Phosphorus Adsorption Characteristics of Protonated Chitosan/Magnetic Composites in Phosphorus-Containing Wastewater

The protonated chitosan/Fe3O4 magnetic composite adsorbents were prepared by reversed-phase suspension cross-linking method. The adsorption characteristics of composite adsorbents on phosphorus in simulated phosphorus-containing waste water were studied. Firstly, the effects of adsorption time on the adsorption characteristics of all the composite adsorbents were investigated; One of the adsorbents with better adsorption properties was selected and the relationship between the adsorption characteristics and the initial concentration of the phosphorus-containing solution was investigated. Then, orthogonal tests were carried out, which included the pH value of the solution, the type of adsorbent, the dosage, the adsorption time and the initial concentration of the solution. The research results showed that the pH value of the raw water had the most obvious effect on the adsorption process, with the optimum pH of 6, followed by the adsorbent type and dosage. The weak factors were the initial solution concentration and adsorption time. The phosphorus removal rate of the absorbent is up to about 80%. The research result of adsorption kinetics showed that the adsorption process can fit Lagergren quasi-second-order kinetic model well, which showed that the adsorption process was chemisorption.