魔芋葡甘聚糖/纳米四氧化三铁静电纺丝膜对六价铬离子吸附研究

Adsorption of konjac glucomannan/nano ferrosoferric oxide electrospun membranes for Cr(Ⅵ)

六价铬离子是一种危害性非常大的重金属离子,开发新型高效吸附剂去除铬离子具有重要意义。采用静电纺丝技术来制备魔芋葡甘聚糖(KGM)/纳米四氧化三铁(Fe3O4)纤维膜,并利用X-射线衍射分析和扫描电镜(SEM)等对材料进行表征,同时考察多重变量控制下该材料对六价铬离子的吸附能力的影响。结果表明,静电纺丝增加了纳米Fe3O4与KGM的相互作用,并形成了由数个纳米大小的纤维组成的"多孔网络"交联结构,吸附能力显著较高。且当纳米纤维膜投加剂量为20 mg/mL、Cr(Ⅵ)溶液的pH为5、Cr(Ⅵ)溶液的初始浓度为30 mg/L时其吸附效果最好,40min吸附可达到14mg/g。

Cr(Ⅵ) is a dangerous heavy metal ion, so it’s of great significance for developing new efficient adsorbent for Cr(Ⅵ).In this study, electrospun KGM/nano Fe3O4 nanofiber membranes were prepared using electrospinning technology to find out its adsorbability of Cr(Ⅵ). x-ray diffraction and scanning electron microscopy were used to analyse and characterize the structure and properties of the nanofiber membranes. We conducted a multivariable control adsorption experiment to determine the adsorbability of nanofiber membranes.The results showed that comparing with the simple synthetic KGM/nano Fe3O4 membranes, electrospinning increased the interaction between nano-Fe3O4 and KGM, formed a porous cross-linking structure consisting of several nano-sized fibers and had a significantly higher adsorbability.In detail, the Cr(Ⅵ) adsorbability of nanofiber membranes reached the maximum when the dosage of adsorbent was 20 mg/mL,pH of Cr(Ⅵ) solution was 5,and the initial concentration of Cr(Ⅵ) solution is 30 mg/L.Moreover, when the adsorption time got 40 min,the adsorption capacity reached the maximum,which is 14 mg/g.