Lithium recovery from shale gas wastewater (SGW) is essential for the growth of a sustainable economy. However, traditional powder adsorbents suffer significant loss and poor recyclability, limiting their practical utility. Here, we fabricate an HMO/MXene/PSF adsorptive membrane, in which 2D MXene serves as the hydrogen bond interacting agent between H 1.33 Mn 1.67 O 4 (HMO) and polysulfone (PSF). Notably, MXene incorporation effectively mitigates Mn leaching due to the hydrogen bond interaction. Efficient lithium recovery from Sichuan Basin SGW is achieved, with a lithium adsorption capacity of 21.18 mg/g. After ten consecutive cycles of adsorption and desorption, the HMO/MXene/PSF membrane shows remarkable cyclic stability, with a negligible decrease in lithium adsorption capacity of merely 0.16 %. Filtration studies reveal that the membrane with a surface area of 12.56 cm 2 can effectively filter 160 mL of SGW. The stability of the membrane due to hydrogen bond interactions and the selective adsorption mechanism are further confirmed through DFT calculations. This work presents a novel concept for constructing a mixed matrix membrane for lithium extraction from SGW and is expected to inspire further efforts in developing LIS-based adsorbents for lithium recovery.
Carbon emission reduction has been accepted as a common concern all over the world. Currently, CO 2 emission is mainly derived from the consumption of fossil fuels. To solve this issue, there is an urgent need to develop technologies for CO 2 capture. The utilization of membrane technology to remove CO 2 from a mixture gas attracts great interest. In the present work, poly(2-hydroxyethyl methacrylate- co -vinylamine) was synthesized by polymerization ( n -vinyl formamide and 2-hydroxyethyl methacrylate), hydrolysis, and ion exchange. The surface function of graphene oxide was carried out by aerobic self-polymerization of dopamine. The mixed matrix membranes were fabricated by adding the nanofiller (before and after modification) into the polymeric matrix. The membrane properties and its structure were characterized by FTIR, TGA, XRD, and SEM. The effect of nanofiller content and operation conditions on membrane performance was investigated. Results showed that the additions of nanofiller could decrease the crystallization of these membranes and effectively improve gas permeance. Remarkably, for the addition of 2.0 wt% dopamine-modified graphene oxide, the CO 2 permeance of the membrane was increased by 30.9% while achieving a CO 2 /N 2 selectivity of 83.5. The CO 2 permeation for CO 2 /CH 4 was also increased by 16.77%. These were surpassed over the 2008 Robeson’s upper bound. These resultant membranes demonstrated attractive potential for low-pressure post-combustion CO 2 capture. Besides, the stability of longtime tests on membranes was studied, and it was observed that membranes exhibited excellent stabilization with continuously operated for 220 h. The excellent properties of these membranes provide new opportunities for gas separation applications.
A polysulfone/metal–organic framework (MOF) based photocatalytic nanofiltration membrane is proposed in this study. Interfacial polymerization (IP) is the universal method of preparing nanofiltration (NF) membranes. In this work, the (TFN) membranes were synthesized with an in-situ interfacial synthetic method to incorporate BiOCl/MIL-101(Fe)@PDA(BMP) into the polyamide (PA) selective layer. Five distinct BMP loadings (0, 0.05, 0.1, 0.15, and 0.2 wt%) were established to examine the impact of additional BMP on the physicochemical characteristics of the produced TFN membranes. Under the irradiation of a xenon lamp with a power of 300 W, the water flux of M3 at a pressure of 0.6 MPa was 277.14 L m -2 h -1 . Furthermore, the BSA-based antifouling tests demonstrated the membrane’s outstanding antifouling capabilities, with a flux recovery rate reaching 94.08 %. The optimal membrane maintained a high and stable retention of tetracycline for 12 h. The interfacial synthesis of MOF/PA offers a new approach to the fabrication of photocatalytic NF membranes.
危险品化学品经营许可证（带存储）