采用液相还原法制备纳米零价铁,使用质量分数为1%的壳聚糖对纳米零价铁进行改性,制备壳聚糖负载纳米零价铁吸附剂。考察pH、温度、吸附剂用量、吸附时间对Cr(Ⅵ)吸附性能的影响。再进行正交试验,探究吸附剂对Cr(Ⅵ)的最佳吸附条件。使用X射线衍射仪、扫描电镜、红外光谱对吸附剂进行表征。结果表明:吸附Cr(Ⅵ)的最佳条件是pH为3,温度为45℃,吸附剂用量为0.4g/L,吸附时间为10min。此条件下对Cr(Ⅵ)的去除效率达99.6%;各因素主次关系为pH>温度>吸附时间>吸附剂用量。吸附动力学符合二级动力学方程,吸附等温模型符合Langmuir等温模型。
Nano zero valent iron (nZVI) was prepared by liquid phase reduction method.Chitosan(CS) solution with mass fraction of 1% was used to modify the nZVI,and the chitosan loaded nZVI adsorption material with high activity was prepared(CS@nZVI).The parameters of pH,adsorption temperature,adsorption time and the CS@nZVI dosage were investigated.On the basis of single factor,L9(34) orthogonal experiment was carried out to explore the best adsorption conditions of Cr(Ⅵ) on the CS@nZVI.The CS@nZVI were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR).The optimal combination of adsorbed Cr(Ⅵ) pH was 3,adsorption temperature was 45℃,CS@nZVI dosage was 0.4g/L and adsorption time was 10min.Under this condition,the removal efficiency of Cr(Ⅵ) reached 99.6%.The primary and secondary relationships of each factor were:pH,adsorption temperature,adsorption time CS@nZVI dosage.The adsorption kinetic equation was more in line with the second-order adsorption kinetic equation.The adsorption isotherm model was in line with the Langmuir isotherm model.
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基金资助
2018年四川省教育厅重点项目(18ZA0284)
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