Enhanced adsorption and photocatalysis properties of molybdenum oxide ultrathin nanobelts

Zhou, Yifan; Bi, Ke; Wan, Long; Ji, Xiang-yin; Wen, Cun; Huang, Kai; Sun, Zijun; Fan, Dongyu; Yang, Han; Wang, Y.G.; Lei, Ming

doi:10.1016/j.matlet.2015.04.078

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…All the three samples showed the characteristic peaks of the MoO 3 crystalline phase (JCPDS 35‐0609) in the range of 5–80°. [ 26 ] The intensity of the diffraction peaks was decreased in the following order MoO 3 − 1 > MoO 3 – 2 > MoO 3 − 3 , indicating the MoO 3 − 1 had a better crystallinity. Notably, the diffraction peaks related to the Ba species were not detected, probably because the content of Ba was low in the MoO 3 − 3 sample.…”

Section: Resultsmentioning

confidence: 99%

“…The second MoO 3 powder was prepared through post‐treatment method according to the reported literature. [ 26 ] The obtained MoO 3 − 1 powders were added to 8.0 ml H 2 O 2 (30 wt.%) solution under stirring until the powder completely dissolved. Then 0.36 g hexadecyl trimethyl ammonium bromide and 16 ml of deionized water were successively added and further stirred for 30 min.…”

Section: Methodsmentioning

confidence: 99%

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Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Zhou

Liu

Zhang

et al. 2023

Applied Organom Chemis

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Molybdenum oxides (MoO3 − x, x = 1, 2, and 3) with three types of morphologies were prepared and applied to the reaction of benzyl alcohol with dimethylformamide (DMF) for synthesis of tertiary amines. The MoO3 − 1 catalyst prepared by direct calcination exhibited high activity and tertiary amines selectivity in the N,N‐dimethylamination of benzyl alcohol under the reaction conditions at 150°C for 12 h using DMF as a methylating agent and solvent, as compared to MoO3 − 2 and MoO3 − 3 catalysts. This feature was ascribed to the high proportion of surface chemisorbed oxygen for MoO3 − 1 sample, which can promote the adsorbed benzyl alcohol transformation into benzaldehyde. The MoO3 − 1 catalyst was also found to be reusable in five consecutive runs without a significant decrease in catalytic activity. In addition, control experiments showed two parallel reaction routes in this catalytic system. One route is the reaction of benzaldehyde intermediate and DMF to form tertiary amines (Route I); the other route is that benzyl formate intermediate reacted with DMF (Route II), which has not been reported before and specifically involves the esterification of benzyl alcohol with formic acid from DMF decomposition to form benzyl formate.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Zhou

Liu

Zhang

et al. 2023

Applied Organom Chemis

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“…This indicates that the sample annealed in nitrogen shows a more than 7 times improvement in photocatalytic activity over that of the as-prepared sample. Moreover, compared with the commercial P25, the photocatalytic activity of the prepared BiLa 1.4 Ca 0.6 O 4.2 annealed in nitrogen is significantly improved under visible light46. To better analyze the reasons for the improvement of the photocatalytic degradation rate, we measured the specific surface area (BET) of the samples by the static method.…”

Section: Discussionmentioning

confidence: 99%

“…After annealing in nitrogen, the specific surface area increases from 2.39 m 2 /g to 6.74 m 2 /g which is improved by 2.82 times. Larger specific surface area make more photocatalytic reaction occur46.…”

Section: Discussionmentioning

confidence: 99%

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Zhong

Lou

Jin

et al. 2016

Sci Rep

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A new compound of BiLa1.4Ca0.6O4.2 is synthesized through solid state reaction, where the Ca substitutes, in part, the La site in a stable BiLa2O4.5 phase. The structure of the BiLa1.4Ca0.6O4.2 crystallizes in space group R3mH with a hexagonal lattice constants of a = 3.893(1) Å, c = 9.891(1) Å. Its optical absorption edge is about 2.05 eV, which just spans the visible light region. The photocatalytic activity of the BiLa1.4Ca0.6O4.2 powder to degradation of RhB under visible light irradiation is measured and improved more than 7 times by annealing in nitrogen ambient, indicating that annealing in nitrogen can effectively improve the photocatalytic activity by producing oxygen vacancy. Although the absolute photocatalytic activity obtained is low, there is great potential for enhancing the activity such as nanoscaling, doping, and coupling with other compounds.

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“…There are different synthesis routes reported in the literature that result in different morphologies of α-MoO 3 ranging from hollow spheres to 1D nanostructures. Most of these synthesis routes use a hydrothermal/solvothermal technique to achieve the required morphology [38,39]. Nanobelts of α-MoO 3 are considered most promising, owing to the single-crystalline nature that is believed to possess special characteristics over the polycrystalline form [40].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis and enhanced photocatalytic activity of single-crystalline nanohybrids for the removal of organic pollutants

2017

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This study focused on the synthesis of α-MoO/rGO (rGO, reduced graphene oxide). One-dimensional nanohybrids under mild conditions and a low temperature wet chemical route produced highly pure single-crystalline orthorhombic α-MoO on GO sheets. Four nanohybrids, labeled as GMO-0, GMO-1, GMO-2 and GMO-3, were synthesized with different mass chargings of GO (0 mg, 40 mg, 60 mg and 100 mg, respectively). The photocatalytic performance for reduction of organic pollutants was analyzed. The presence of different amounts of GO in the prepared metal oxide hybrids altered the performance of the material as elaborated by the Brunauer-Emmett-Teller surface area, UV-visible diffuse reflectance spectra and the resulting reduction of organic dyes depicted by photocatalytic experiments. GO as a support material and active co-catalyst decreased the band gap of α-MoO (2.82 eV) to lower values (2.51 eV), rendering the prepared hybrids usable for visible-light-induced photocatalysis. The large specific surface area (72 m g) of the mesoporous α-MoO/rGO nanohybrid made it an efficient photocatalyst for the elimination of azo dyes. Very fast reduction (100%) of Rhodamine B was observed in a few minutes, while Congo Red was degraded by 76% in 10 min, leading to the formation of stable intermediates that were completely neutralized in 12-14 h under light irradiation. The amount of GO loaded in the samples was limited to a point to achieve better results. After that, increasing the amount of GO decreased the extent of degradation due to the presence of a higher electron acceptor. Photocatalytic experiments revealed the synergistic effect, high selectivity of the prepared nanohybrids and degradation of azo dyes. The kinetics of the degradation reaction were studied and found to follow a pseudo first-order reaction.

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Enhanced adsorption and photocatalysis properties of molybdenum oxide ultrathin nanobelts

Cited by 12 publications

References 26 publications

Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Facile synthesis and enhanced photocatalytic activity of single-crystalline nanohybrids for the removal of organic pollutants

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