Separation Ni+2 from wastewater by synthesis positively charges nanofiltration membrane

چکیده مقاله

RemovaRemoval of heavy metals from wastewater is of critical importance due to their high toxicity and tendency to crisis of humanity. In this study, we made a positively charged nanofiltration membrane was developed for removing heavy metals. A composite NF membrane was fabricated by modification of polysulfone (PSf) ultrafiltration support. The active top-layer was formed by interfacial cross-linking polymerization of polyethylenimine (PEI) with p-xylene dichloride (XDC) and quaternized with methyliodide to form a perpetual positively charged layer. The morphological changes of membrane surfaces and cross-section were studied by Scanning Electron Microscopy (SEM. As a result, a high water flux and CaCl2 rejection (1000 ppm) was obtained for the composite membranes with amounts of 17.8 L/ (m2.h) and 93.6% at 4 bars and 30oC, respectively. At the end of a real wastewater sample was examined by synthesizing nanofiltration membranes for separating Ni+ cations from wastewater. Ni+ cation concentration in these experiments was measured by atomic absorption spectrometry and the rejection was determined 96.2 %.