As an emerging metal–organic framework (MOF) material in recent years, the MOF-303 membrane has shown great potential applications in seawater desalination, dehydration, and atmospheric water harvesting. Herein, we report on a dense and uniform MOF-303 membrane fabricated by a facile in situ hydrothermal synthesis approach in the presence of an anodized aluminum oxide (AAO) channel membrane acting as the only Al source and substrate. Interestingly, the MOF-303 isomer can be obtained due to an insufficient amount of organic ligand caused by the less hydrophilic and larger pore size of the AAO substrate. The MOF-based composite membranes possessed surface-charge-governed ionic transport behavior. Moreover, the MOF-303/AAO membrane yielded an output power density of 1.87 W/m2 under a 50-fold KCl concentration gradient. Under a 50-fold gradient of artificial seawater and river water, a maximum power density of 1.46 W/m2 can be obtained. After 30 days of stability testing, the composite membrane still maintained the power output, and the power density was higher than 1.20 W/m2. This work provides a facile and effective strategy for constructing Al-based MOF composite membranes and boosts their applications in harvesting salinity-gradient energy.
Peng Zhou,Jingcheng Wu,Shuting Tian,Shuangshuang Li,Yi He,Shihong Zhang,Taibin Sun
This study applied a novel strategy to modify an inert fluorine-containing surface by combining alkaline lignin (AL) and silk fibroin (SF), introducing many active sites. The intercalation sites of SF during the formation of the AL coating allow the shape of the Mortise-Tenon metal-organic framework (MOF). MOF-303 with a Mortise-Tenon structure was grown on the surface of the membrane. The PVDF@MOF-303 membrane possesses superhydrophilic/underwater superoleophobic properties. The modified membrane showed perfect resistance to oil adhesion. Stable oil-in-water emulsions and toxic heavy metal ions can be separated by the PVDF@MOF-303 membrane with a Mortise-Tenon structure. This membrane has achieved outstanding oil-in-water emulsion separation efficiency (over 99.2 %) and flux (over 4200.0 L m −2 h −1 bar −1 ). After ten repeated experiments, a separation efficiency of 93.0 % was obtained. This membrane was used for heavy metal adsorption with high capacity (over 3374.4 mg m −2 ) and efficiency (over 99.6 %). Even more importantly, harmful heavy metal ions soluble in water can be effectively removed during emulsion separation. It can modify other substrates due to the easy preparation method and efficient performance described in this report.
危险品化学品经营许可证（带存储）