Study For Function Nanofiber Membranes’ Ability Of Removing Heavy Metal Ions From Waste Water

With the further development of the global industry,a series ecological problems have become increasingly severe.Water contamination is a grave challenge for the whole world,among which,heavy metal ions are very difficult to deal with due to their properties of easily dissolving in water,nonbiodegradability,easily accumulating,high toxicity.How to remove the heavy metal ions efficiently from waste water has tended to be a hot-spot in relevant fields.In this article,amino-modified PAN@SiO₂ nanofibrous membranes and PA6@HAP nanofibrous membranes were fabricated by electrospinning technique combined with sol-gel and hydrothermal methods,moreover,those adsorbents were successfully used to conduct Cr（VI）removal experiments.SEM,EDS,FTIR,XRD,BET proved the following conclusions:SiO₂nanoparticles were homogeneously loaded on the surface of PAN nanofibers and amino-modified PAN@SiO₂ nanofibrous membranes were obtained by further amino-modifying.Meanwhile,The Cr（VI）removal experiments’results indicated that the maximum of Cr（VI）sorption can reach to 112.6 mg/g;the sorption process fitted to second-order equation and Langmuir isotherm model.In addition,PA6@HAP hybrid nanofibrous membranes were successfully prepared by the uniformly growing of nanosized hydroxyapatite particles on the surface of PA6 nanofibers.The adsorption experiments revealed that the Cr（VI）sorption capacity of PA6@HAP hybrid nanofibrous membranes can achieve to188.4 mg/g and the sorption satisfied the first-order equation as well as the Freundlich multilayer isotherm model.This two kinds of nanofibrous membranes have great advantages,such as high efficiency,high porosity and high specific area,easily separated from aqueous solutions and excellent cyclic utilization performance which will definitely make them to be potential adsorbents for removing Cr（VI）from waste water.