Separation and recovery of alkali cellulose wastewater with high concentration of salts by cross-linked poly(vinyl alcohol)/polytetrafluoroethylene ultrafiltration membrane
writer：Kang Yang, Chuanfeng Wang, Yingbo Chen*, Jiaopeng Xu, Lei Sun, Siran Liu
keywords：Poly(vinyl alcohol)Ultrafiltration membraneCross-linkingCarboxymethyl Cellulose SodiumPolytetrafluoroethylene
source：期刊
specific source：Journal of Water Process Engineering Volume 43, October 2021, 102238
Issue time：2021年
Carboxymethyl Cellulose Sodium (CMC) is widely used in paper-making and textile industries, and the treatment of CMC wastewater containing salt and alkali has become one of the hot spots in the field of wastewater treatment. In this study, poly(vinyl alcohol) (PVA)/polytetrafluoroethylene (PTFE) membranes were prepared through non-solvent induced phase inversion (NIPS) and cross-linking for the separation of CMC and salt-alkali. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology and surface properties of the membranes. The results showed that both heat cross-linking and chemical cross-linking with glutaraldehyde (GA) improved the structural stability of the PVA/PTFE membranes. The salt-alkali optional transmitting rate (OTR), the CMC rejection rate, and the flux of the heat cross-linked PVA/PTFE membrane and chemical cross-linked PVA/PTFE membrane are 93.0%, 99.3%, 220.00 (L/m2h) and 93.4%, 99.4%, 89.20 (L/m2h) at 0.2 MPa, respectively. Besides, the GA cross-linked PVA/PTFE membrane showed stable and efficient separation performance in the test of separating CMC. Therefore, the resultant membrane can be used for the separation of CMC, salt, and alkali, providing a new idea for the treatment of high-salt-alkali cellulose wastewater.