CNFM的制备及其协同电动技术修复土壤重金属的研究

首先采用静电纺丝工艺制备壳聚糖纳米纤维膜并优化了其制备条件，将制备的纳米纤维膜协同电动技术对土壤中的重金属（Cu、Cr）进行了修复.结果表明，纳米纤维膜制备的优化条件为：m（壳聚糖CS）/m（聚乙烯醇PVA）为20：80，乙酸质量浓度为20%，混合溶液质量分数为8%；所制备的纳米纤维膜平均直径为37.11nm，对金属的吸附平衡时间为4h.单一的电动修复来处理土壤中的重金属效率较低，Cu和Cr的去除效率仅为34.9%和11.7%；采用电动技术协同壳聚糖纳米纤维膜能显著提高重金属的去除效率，二者的去除效率分别达到了82%和91%.

Fabrication of CNFM and its application in soil remediation of heavy metals coupled with electrokinetic technology

Chitosan nano-fiber membrane was fabricated by electrospinning under optimized parameters and the prepared nano-fiber membrane coupled with electrokinetics (EK) were used to remediate soils contaminated by heavy metals (Cu and Cr). Results showed that the optimum parameters for fabricating membrane were as follows: weight ratio of chitosan/polyvinyl alcohol was 20/80, acetic acid concentration was 20% and the mixed solution concentration was 8%. The average diameter of the prepared nano fiber membrane was 37.11nm and the adsorption equilibrium of CS /PVA for metal ions was 4h．Soil remediation for heavy metals efficiency of single electrokinetic process was low, reached only 34.9% and 11.7%. The efficiency was greatly improved by the coupling process of EK and nano-fiber membrane and metal removal efficiency by the coupling process attained 82% and 91%, respectively.