Xi Liu,Yanhong Ji,Yinjie Sun,Ming Jing,Zunbo Han,Yunfei Song,Yangzhen Liu,Haoran Chen,Benqiao He
Biodegradable membranes can be decomposed after use, aligning seamlessly with the principles of eco-friendly environmental conservation prevalent in modern society. In this study, poly(butylene succinate) (PBS)/TiO 2 hybrid membranes have been prepared by adding nano-TiO 2 into biodegradable PBS. The impact of nano-TiO 2 on the structure, properties, and degradability of membrane are investigated. The incorporation of nano-TiO 2 has a favorable influence on the mechanical properties of membrane, with tensile strength increased by 80.37 %. When the TiO 2 content is 3 wt%, the hybrid membrane demonstrates a significant enhancement in pure water flux, reaching 56.41 L·m −2 ·h −1 . This flux is 6 times greater than that of pure PBS membrane. Meanwhile, the BSA rejection remains at approximately 95 %. Moreover, the flux recovery of membrane increases from 71.52 % to 96.19 %, and total fouling decreased from 57.09 % to 38.05 %. In long-term use, the permeation flux remains stable between 52.14 and 59.76 L·m −2 ·h −1 , and the BSA rejection is about 93.49 %. Consequently, the membrane maintains its fundamental performance. After service, hybrid membranes can be degraded immediately in alkali solution. This study provides a feasible solution for the development of green, efficient and degradable membranes for wastewater treatment, and opens up a new way for circular economy in membrane technology.
Membrane separation technology often suffers from fouling during operation and undergoes a trade-off effect between permeability and selectivity . We report a new strategy for fabricating antifouling poly(vinylidene fluoride) (PVDF) ultrafiltration membrane by incorporating hydrophilic, positive-charge tuned quaternized chitosan magnetic particles (QCMP). Fe 3 O 4 -chitosan particles were synthesized by co-precipitation and cross-linked by glutaraldehyde, and further quaternization modification was applied to obtain a series of QCMP with different charge densities. Then, the QCMP were incorporated into the matrix of PVDF to prepare hybrid membrane via the non-solvent-induced phase separation method. The effect of incorporated QCMP on the membrane morphology and properties was determined using scanning electron microscopy, water contact angle, surface free energy , membrane pore size and porosity. The incorporation of QCMP into the PVDF membrane effectively increased the surface hydrophilicity. Results of bovine serum albumin (BSA) solution filtration showed a higher flux recovery ratio (FRR) and a lower total fouling ratio(R t ) of the QCMP/PVDF hybrid membranes than those of the PVDF pristine membrane, indicating the addition of QCMP was helpful to enhance antifouing performance for BSA via improving hydrophilicity and neutralizing the surfaces of negatively charged PVDF membranes. Furthermore, the permeability flux of BSA was increased by 53 % and the rejection rate was also increased by 26 %, indicating the hybrid membranes have the potential to break the permeability-selectivity trade-off. Therefore, this study provided a green, simple and effective method for the rational design and construction membranes with enhanced the permeability and selectivity as well as antifouling performance.
危险品化学品经营许可证（带存储）