Fabrication of High Flux Polysulfone/Mesoporous Silica Nanocomposite Ultrafiltration Membranes for Industrial Wastewater Treatment

The inclusion of nanosphere particles like mesoporous silica MSNS~500(nm) inside the membrane substance matrix substantially enhanced water permeability and dye rejection. The dry/wet stage conversion method was employed for fabricating all membranes. The influence of different concentrations for MSNS (0–8% wt.%) in the existence of povidone (PVP) acting in the role of pore-forming on the behavior of the PSF-UF membrane was investigated. Results revealed that as soon as MSNS level grew up till 6 wt. percent, the rejection of Methylene blue (MB) dye gradually increased. The morphological properties of UF-produced membranes PS/PVP/SiO2 were investigated using scanning electron microscopy. They demonstrated a considerable degree of MB rejection of 84.7 percent, as well as an increase in MSNS concentration to 6 wt. percent. Besides, as the MSNS concentration raised to 6 wt.%, the membrane's permeability dropped from 429.2 L/m2.h for PS/PVP to 136 L/m2.h for PS/PVP/SiO2 (6%) membrane. Only water was permitted to pass across the hydrophilic UF fabricated membrane on the feed side, improving the quality of the water stream on permeate portion, making the fabricated membranes appropriate for industrial treatment of wastewater. The addendum of the polyvinylpyrrolidone acting as an additive to the investigated membranes enhanced their efficiency.

Preparation and Characterization of Interfacially Polymerized Polyamide Membrane for Dye Removal

Interfacial polymerization of polyamide was conducted using hydrophobic and hydrophilic membrane support. The effects of monomer concentration were investigated, and the resulting thin-film composite membranes were tested for their performance in dye removal using different flow configurations. The results showed that a dense polyamide layer was successfully formed on the hydrophilic support, while a polyamide layer with a very loose structure was formed on the hydrophobic support. The polyamide layer became smoother and more hydrophilic as the concentration of trimesoyl chloride was increased, leading to increased permeate flux and reduced dye rejection. The highest sunset yellow rejection of 45.7% with a permeate flux of 4.9 L/m2.h was obtained when the polyamide layer was formed from trimesoyl chloride concentration of 0.05 w/v% (a high amine to acid chloride monomer ratio of 20) and the filtration was in cross-flow configuration.

Fabrication of Electro Spun Nylon6.12/Chitosan @PES Nanofibrous UF Membrane Towards Dyes Rejection From Synthetic Wastewater

Nanofibrous ultrafilter of nylon6.12/chitosan@Poly ether sulfone (N6.12/CS@PES) membrane were fabricated by chitosan casted PES membrane and coated with nylon6.12 thin layer using electrospinning technique for dye rejection. The membranes were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). Both of cationic and anionic dye rejection capability of the membrane was investigated for basic blue dye41 and alizarin red dye, respectively, as dyes were investigated with respect to solution parameters (pH, Zeta potential, pressure, dye concentration and different electrolyte) through filtration system. In addition, the effect of parameters and their possible interactions on dye rejection have been studied. An enhanced hydrophilicity and antifouling property was observed for the composite membrane as compared to pristine PES ultrafiltration membranes. The results show that the rejection of dyes increase with the decreases of operating pressure. At optimum condition of PH=7, and pressure=10 bar and concentration=220 mg/L, the rejection ratio improves from 75.3 to 99.5% and 71 to 82% for basic blue dye41 and alizarin red dye, respectively. Dye rejection are not changed after 7 cycles and not change separation efficiency of dyes. The mechanical and electrical properties were investigated for PES and N6.12 / CS@PES composite membrane. The results showed that the N6.12 / CS@PES composite membrane exhibited the highest mechanical properties and the highest dielectric constant especially at low frequencies with low dielectric loss. This study demonstrated that the developed nanofibrous composite membrane were successfully characterized and proved to be a good rejection for dyes from aqueous solutions.