Dataset Information

Nano-MOF@defected film C₃N₄ Z-scheme composite for visible-light photocatalytic nitrogen fixation.

ABSTRACT: Photocatalytic nitrogen fixation has attracted extensive attention in recent years. Studies have shown that catalytic materials with O, N and other defects can effectively reduce the bond energy of N[triple bond, length as m-dash]N triple bond when N₂ is adsorbed on the defects. As an outstanding non-metallic catalyst, g-C₃N₄ has been widely studied in the field of photocatalytic catalysis, and the nitrogen-defected C₃N₄ shows promoted photocatalytic activity. Herein, nano-size MOF-74 particles (<20 nm) was dispersed on nitrogen-defected C₃N₄ thin film (∼4 nm) via a simple sol-gel method. The combination of Nano-MOF and defected film C₃N₄ could effectively improve the photocatalytic activity of nitrogen fixation through Z-scheme mechanism compared with pure defected film C₃N₄.

SUBMITTER: Ding Z

PROVIDER: S-EPMC9055406 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Nano-MOF@defected film C3N4 Z-scheme composite for visible-light photocatalytic nitrogen fixation.

Ding Zhu Z Wang Shuo S Chang Xue X Wang Dan-Hong DH Zhang Tianhao T

RSC advances 20200713 44

Photocatalytic nitrogen fixation has attracted extensive attention in recent years. Studies have shown that catalytic materials with O, N and other defects can effectively reduce the bond energy of N[triple bond, length as m-dash]N triple bond when N2 is adsorbed on the defects. As an outstanding non-metallic catalyst, g-C3N4 has been widely studied in the field of photocatalytic catalysis, and the nitrogen-defected C3N4 shows promoted photo ...[more]

PMID: 35519729

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Project description:Flexible fiber membranes for pollutant removal have received increasing attention due to their high adsorption performance and easy recycling characteristics. However, due to the lack of environmentally friendly regeneration, some adsorption membranes have low regeneration efficiency, especially in terms of chemical adsorption, so they lack reusability. This study prepares a series of conducting polymer [PAn (polyaniline) or PPy (polypyrrole) or PTh (polythiophene)] graphene quantum dots (GQDs, the size of GQDs is about 20 nm)/TiO2 ternary fiber membranes via a facile electrospinning method with chemical deposition. Remarkably, this creates an anatase TiO2 and π-conjugated system. The combination is beneficial to the photocatalytic degradation of organic pollutants, showing synergistic promotion in both the degradation rate and the degree of decomposition. The UV-vis test shows that the combination of GQDs broadens the optical response threshold of TiO2, from near ultraviolet region excitation to visible region excitation. At the same time, the conductive polymer load further reduces the energy required for photogenerated electron transfer, which theoretically improves the degradation effect. Photocatalytic degradation tests showed that the PTh/GQDs/TiO2 fiber membrane exhibited significant high photocatalytic activity of visible-light in the methylene blue (MB) and TC degradation. The degradation rate level is 92.90% and 80.58%, respectively and the MB removal is more than 4 times that of bare TiO2 membrane. After photocatalytic regeneration four times, the regeneration efficiency can be maintained above 95%. Notably, various experimental results show that the interface charge transfer mechanism between GQDs/TiO2 and PTh follows the Z-scheme heterojunction, which maximizes the retention of strong reducing electrons and oxidation holes. In the degradation, the active species of ·O2 - and ·OH, make different contributions in the photocatalysts, which oxidize and break down the pollutant molecules into small molecules and then to harmless substances. According to the electronegativity difference of the material itself, PTh acts as electron acceptor in the degradation system, and TiO2 fiber membrane doped with GQDs acts as electron donor. The present research, not only offers feasibility of the PTh/GQDs/TiO2 flexible fiber membrane as an environment-friendly catalyst, but also motivates researchers to develop flexible fiber materials for future photocatalytic technology.

Dataset Information

Nano-MOF@defected film C₃N₄ Z-scheme composite for visible-light photocatalytic nitrogen fixation.

Publications

Nano-MOF@defected film C<sub>3</sub>N<sub>4</sub> Z-scheme composite for visible-light photocatalytic nitrogen fixation.

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