High-flux and high rejection TiO2 nanofibers ultrafiltration membrane with porous titanium as supporter

Fabrication of a ppb-level NO2 gas sensor by sensitizing nanobundles assembled by In2O3 nanotubes with TiO2 quantum dots

A stainless steel mesh supported TiO2 nanowires membrane is prepared by heating hydrogen titanate nanowires deposited on stainless steel mesh. The stainless steel mesh supported TiO2 nanowires membrane exhibits superhydrophilic and underwater superoleophobic property. The water contact angles in air of the stainless steel mesh supported TiO2 nanowires membrane is 0° and the underwater oil contact angles (gasoline, n-hexadecane, hexamethylene and methylbenzene) are >150°. Both of surfactant-free oil-in-water mixtures and surfactant-stabilized emulsions are separated with a high permeation flux of >106 L m−2 h−1 bar−1 and a separation efficiency of >99.1%. The stainless steel mesh supported TiO2 nanowires membrane exhibits good resistant to fouling, and the possible organic pollutants are easy to be removed by heat treatment and the superhydrophilic and underwater superoleophobic property is recovered.

Stainless steel mesh supported TiO2 nanowires membrane with ultra-high flux for separation of oil-in-water mixtures and emulsions

Supporting nanomaterials having strong metal-support interaction is the key to an efficient catalyst. The present paper describes a morphology-controlled synthesis of silver (Ag) nanoparticles supported on nanostructured tungsten oxide (WO3) for selective photoelectrocatalytic carbon dioxide reduction reactions (CO2RR) under visible light irradiation. Highly dispersed Ag on WO3 nanorod was synthesized by a one-pot preparation method in the presence of cetyltrimethylammonium bromide (CTAB). The synthesis strategy remained intact and reproduced by varying loading of Ag, which was further confirmed by various characterization techniques like XRD, SEM, TEM, STEM elemental mapping, Raman, XPS, FT-IR, and BET analysis. The morphological growth of the WO3 nanorod (NR) and the related mechanism was studied and discussed in the paper. 1.5 wt % Ag showed optimum loading for high dispersion over WO3-NR and efficient CO2RR with high current density (0.4 mA cm−2), towards the desired selective product formation (formic acid). The efficiency of the catalyst was further correlated with cluster vacancies on the interface of Ag particle and WO3 nanorod by positron doppler broadening (DB) spectroscopy.

Morphology controlled synthesis of 2D heterostructure Ag/WO3 nanocomposites for enhanced photoelectrochemical CO2 reduction performance

The rational design of highly active and stable atomically dispersed M-X4 (M = Fe, Co, Ni, etc., X = C, N) -based catalysts holds promises for wide application in almost all realms of catalysis. Despite great effort in the construction of specific M-X4 centers, the possible effect of non-coordinated heteroatoms on the catalytic activity of metal centers has been rarely explored. Herein, we develop a new type of M-X4 catalyst composed of Fe-N4 centers and non-coordinated B heteroatoms (FeNC+B) and find the key role of non-coordinated B adjacent to Fe-N4 centers in tailoring their electron density and final catalytic selectivity. The experimental and theoretical results demonstrated that non-coordinated boron atoms could decrease the electron density of Fe-N4 centers to a suitable level and thus boost the selective production of nitriles from amine oxidation by depressing the formation of imines due to the flattened energy barrier of the reversible conversion of imines back to amines. As a reusable heterocatalyst, the state-of-the-art FeNC+B catalyst provides a turn-over frequency (TOF) value of 21.6 molbenzonitrile·molFe−1·h−1 (100 °C), outpacing that of bench-marked nonnoble-metal-based homogeneous catalyst by a factor of 3.4.

Synergy of Fe-N4 and non-coordinated boron atoms for highly selective oxidation of amine into nitrile

One Step Preparation of Highly Dispersed TiO2 Nanoparticles

Heterostructure Ag@WO 3- x Composites with High Selectivity for Breaking Azo-bond

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One Step Preparation of Highly Dispersed TiO2 Nanoparticles

Heterostructure Ag@WO 3- x Composites with High Selectivity for Breaking Azo-bond