Cation-Intercalated Clay-Based Two-Dimensional Membranes for Effective Desalination and Molecule Sieving.

Montmorillonite (MMT) is known as an ion-exchangeable material, and cations between MMT nanosheets are easily exchanged by other cations. In this work, Ca, Fe, and Al intercalated two-dimensional MMT membranes were developed by ion exchange of pristine MMT membranes (Na-MMT), and their ion and dye removal abilities were investigated. The -spacings of hydrated Fe intercalated MMT membrane (Fe-MMT) and Al intercalated MMT membrane (Al-MMT) were decreased compared with hydrated Na-MMT membrane due to the stronger electrostatic attraction between Fe/Al and negatively charged MMT nanosheets.

Covalent organic framework membrane on electrospun polyvinylidene fluoride substrate with a hydrophilic intermediate layer.

Generally, electrospun membranes have high mechanical strength, high porosity and low permeation resistance. Although covalent organic frameworks (COFs) have attracted great interest as advanced membrane materials, few works disclosed that the COFs composite membranes were synthesized on electrospun substrates. In this work, the electrospun polyvinylidene fluoride (PVDF) membranes were used as substrates for the preparation of COF composite membranes with graphene oxide and oxidized carbon nanotubes (GO-OCNTs) as an intermediate layer.

Amorphous TiO Bridges Stabilized WS Membranes with Excellent Filtration Stability and Photocatalysis-Driving Self-Cleaning Ability.

Two-dimensional (2D) membranes as a new type of water filtration membrane have shown great potential in water separation and purification. However, their long-term stability under cross-flow conditions and their antifouling property are two main concerns for practical separation and purification processes. In this work, a strategy of nanoparticle bridges based on amorphous TiO is developed to link adjacent WS nanosheets on a WS membrane surface, leading to a strong membrane surface with excellent stability during 204 h of continuous cross-flow filtration.

Ultrafast separation of oil/water mixtures with layered double hydroxide coated stainless steel meshes (LDH-SSMs).

With the frequent discharge of wastewater and leakage of oil accidents, it has gained much attention to treat oil and organic pollutants from water. Herein, a facile and environmentally friendly approach is presented to fabricate MgAlZn layered double hydroxide-coated stainless steel mesh (LDH-SSM) via hydrothermal method, which could be used to separate various oil/water mixtures due to its superhydrophilic and underwater superoleophobic property. The as-prepared mesh possesses selective separation performance for oil/water mixtures with separation efficiency higher than 99.

Highly Stable and Antibacterial Two-Dimensional Tungsten Disulfide Lamellar Membrane for Water Filtration.

Two-dimensional (2D) lamellar membranes consisting of restacked WS nanosheets have shown excellent separation properties for water filtration. The stability, antifouling properties, and antibacterial activities of the WS laminar membranes were investigated for practical application. We discovered that the separation properties of the WS laminar membranes changed slightly after soaking in water for 28 days as well as that of a 45 h-cross-flow filtration, demonstrating an extraordinary operational stability of the WS laminar membranes.

Versatile polyvinylidene fluoride hybrid ultrafiltration membranes with superior antifouling, antibacterial and self-cleaning properties for water treatment.

Novel ultrafiltration membranes with both superior antibacterial and self-cleaning properties were fabricated. By using a non-solvent induced phase separation method (NIPS), N-halamine epoxide and siloxane were grafted onto the multi-walled carbon nanotubes (N-Si-MWNTs) to fabricate polyvinylidene fluoride (PVDF) hybrid membranes. The membrane morphology was observed under a field emission scanning electron microscopy.

Dispersed Vanadium in Three-Dimensional Dendritic Mesoporous Silica Nanospheres: Active and Stable Catalysts for the Oxidative Dehydrogenation of Propane in the Presence of CO.

The uniform monodispersed vanadium-doped three-dimensional dendritic mesoporous silica nanospheres (nV-MSNSs) were successfully synthesized in a heterogeneous oil-water biphase stratification reaction system and characterized by several state-of-the-art methods. The synthesized nV-MSNSs were applied to the oxidative dehydrogenation of the propane (ODHP) reaction with the presence of CO and exhibited excellent catalytic performances. The results show that the vanadium loading (1.