CS/PVA磁性复合微球的制备及对水中Cr(Ⅵ)吸附性能的探讨

Preparation of CS/PVA Magnetic Composite Microspheres and Investigation of Their Adsorption Properties for Cr (Ⅵ) in Water

采用共沉淀法制备了磁性Fe_(3)O_(4)粒子,并在通过戊二醛与壳聚糖、聚乙烯醇发生交联反应,制备了聚乙烯醇改性壳聚糖磁性复合微球(PMCTS)。并对复合微球组成、结构、形态以及磁性进行了表征,进一步考察了微球投入量、Cr(Ⅵ)溶液初始浓度、吸附时间和温度对PMCTS复合微球吸附性能的影响,同时对微球回收率进行了分析。实验表明:当水中含Cr(Ⅵ)为30 mg/L,向吸附体系投入0.5 g复合微球,在45℃下反应70 min,Cr(Ⅵ)去除率可达98.6%,且回收率可达到92.5%。因此,PMCTS复合微球用于吸附水中Cr(Ⅵ)快速且有效。

Magnetic Fe3O4 particles were prepared by co precipitation method,and polyvinyl alcohol modified chitosan magnetic composite microspheres(PMCTS)were prepared by crosslinking reaction with glutaraldehyde,chitosan,and polyvinyl alcohol.And the composition,structure,morphology,and magnetism of the composite microspheres were characterized.The effects of microsphere input,initial concentration of Cr(Ⅵ)solution,adsorption time,and temperature on the adsorption performance of PMCTS composite microspheres were further investigated,and the microsphere recovery rate was analyzed.Experiments have shown that when the water contains 30 mg/L of Cr(Ⅵ),adding 0.5 g of composite microspheres to the adsorption system and reacting at 45℃for 70 minutes,the removal rate of Cr(Ⅵ)can reach 98.6%,and the recovery rate can reach 92.5%.Therefore,PMCTS composite microspheres are used for the rapid and effective adsorption of Cr(Ⅵ)in water.