A novel method of surface modification to polysulfone ultrafiltration membrane by preadsorption of citric acid or sodium bisulfite

Abstract

In membrane processes, various agents are used to enhance, protect, and recover membrane performance. Applying these agents in membrane modification could potentially be considered as a simple method to improve membrane performance without additional process. Citric acid (CI) and sodium bisulfite (SB) are two chemicals that are widely used in membrane feed water pretreatment and cleaning processes. In this work, preadsorptions of CI and SB were developed as simple methods for polysulfone ultrafiltration membrane modification. It was found that hydrogen bonding and Van Der Waals attraction could be responsible for the adsorptions of CI and SB onto membranes, respectively. After modification with CI or SB, the membrane surfaces became more hydrophilic. Membrane permeability improved when modified by SB while decreased a little when modified by CI. The modified membranes had an increase in PEG and BSA rejections and better antifouling properties with higher flux recovery ratios during filtration of a complex pharmaceutical wastewater. Moreover, membrane chlorine tolerance was elevated after modification with either agent, as shown by the mechanical property measurements.

Evaluation of Antimicrobial Efficiency of New Polymers Comprised by Covalently Attached and/or Electrostatically Bound Bacteriostatic Species, Based on Quaternary Ammonium Compounds

“…As an example, the ATR spectrum of the PSF membrane containing 5%wt P(SSAmC16-co-VBCHAM25)-D3a is compared in Figure 4 with the spectra of the two respective homopolymers, namely PSF and P(SSAmC16-co-VBCHAM25)-D3a. As expected, the PSF matrix can be easily identified in the blend, since several characteristic bands of PSF are easily observable [31,32]. More specifically, the characteristic absorption band at 1580 cm −1 and 1323 cm −1 are attributed to the C=C stretcing in the aromatic rings and the C-SO2-C assymetric streching, respectively.…”

Effect of Glass Fibers Thermal Treatment on the Mechanical and Thermal Behavior of Polysulfone Based Composites

“…The stretching vibration of the asymmetric O=S=O band occurred at 1292 and 1325 cm -1 , while the peak at 1232 cm −1 referred to the stretching vibration of the C-O band. The stretching of the symmetric O=S=O bands appeared at 1140 and 1168 cm −1 , and the aryl group was indicated by 1019 cm −1 peak [1,23,39,40].…”

Characterization on Performance, Morphologies and Molecular Properties of Dual-Surfactants Based Polyvinylidene Fluoride Ultrafiltration Membranes

“…Generally, the membranes showed typical spectra of PVDF material. It can be seen from the figures, a strong peak of C-F stretch and C-C-C asymmetric stretch were showed at wavenumber of 1175-1180 cm −1 and 880 cm −1 indicated the interaction of PVDF in the membrane [40]. Beside, C-O bond stretch at 1105 cm −1 was observed and indicated the existence of PEG additive in the fabricated membranes.…”