Intramolecular heterostructured carbon nitride with heptazine-triazine for enhanced photocatalytic hydrogen evolution

Cross-linked birnessite-type manganese oxides (δ-MnO2) with ultrathin structures (nanosheet and nanobelt) were successfully synthesized by a facile CTAB-intercalation exfoliation method. The unique ultrathin structure provides high percentage of exposed surface atoms, leading to an increase in the contact area with the reaction gases. Additionally, specific crystal facets were exposed on the different ultrathin structures and hence facilitate the control of oxygen vacancies (Vo), which strongly affects the physico-chemistry properties and therefore tunes the activity of reactive sites. As a result, ultrathin δ-MnO2 cross-linked nanosheets with major exposed (100) facet exhibits better activity for H2S oxidation in comparison with δ-MnO2 nanobelts with (002) facet and δ-MnO2 stacked nanosheets with (001) plane, giving complete H2S conversion and sulfur selectivity at 210 °C, which is superior to the most of reported manganese-based catalysts. In addition, kinetics study revealed that reaction between adsorbed O2 and H2S is the rate determining step.

Construction of cross-linked δ-MnO2 with ultrathin structure for the oxidation of H2S: Structure-activity relationship and kinetics study

Graphitic Carbon Nitride-based Nanostructures as Emergent Catalysts for Carbon Monoxide (CO) Oxidation

Z-scheme heterojunction of low conduction band potential MnO2 and biochar-based g-C3N4 for efficient formaldehyde degradation

Herein, two-dimension (2D) δ-MnO2-modified porous g-C3N4/micro-mesoporous titanium phosphate (MO-CN/TiP) nanocomposites have been controllably fabricated by a two-step solvothermal process. The amount-optimized MO-CN/TiP nanocomposite exhibits greatly improved photocatalytic CO oxidation performance (87%) compared with corresponding bare TiP and CN/TiP, even superior to the commercial P25 TiO2. Based on the experimental results of time-resolved surface photovoltage responses, photocurrent action spectra, and electron paramagnetic resonance signals, it is clearly confirmed that the exceptional photoactivity is mainly attributed to the great promotion in the Z-scheme charge transfer in resultant dimension-matched CN/TiP nanocomposite and in the O2 activation via the modified MO. The porous structure favorable to increase the specific surface areas and to facilitate the mass diffusion and the extended visible-light absorption also contribute to the photoactivity enhancement. Moreover, it is uncovered by the in-situ diffuse reflectance fourier transform infrared spectra that CO is previously adsorbed by the formed OH OC intermediate with the surface hydroxyls and then oxidized.

Porous two-dimension MnO2-C3N4/titanium phosphate nanocomposites as efficient photocatalsyts for CO oxidation and mechanisms

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Porous two-dimension MnO2-C3N4/titanium phosphate nanocomposites as efficient photocatalsyts for CO oxidation and mechanisms