Sandwich-like mesoporous graphite-like carbon nitride (Meso-g-C3N4)/WP/Meso-g-C3N4 laminated heterojunctions solar-driven photocatalysts.

Three-dimensional mesoporous graphite-like carbon nitride (Meso-g-C3N4/WP/Meso-g-C3N4) laminated heterojunction nanosheets are successfully synthesized by solid-phase in situ reduction combined with high temperature calcination. Meso-g-C3N4/WP/Meso-g-C3N4 has a relatively high specific surface area of 82 m2 g-1, a large pore size of 8-15 nm, and a narrow band gap of ~2.7 eV. The solar-driven photocatalytic reaction hydrogen production rate (~198.1 µmol h-1g-1) for Meso-g-C3N4/WP/Meso-g-C3N4 3D laminated heterojunctions is approximately 10 times higher than that of pristine g-C3N4. This discrepancy can be attributed to the synergistic effect of the 3D interbed heterojunction structure, which favors the spatial separation of photogenerated charge carriers due to its suitable band positions; its nanosheet structure, favoring the charge transfer to surface; and its mesoporous structures, offering more surface active sites and facilitating mass transfer. This novel sandwich-like laminated heterojunction structure offers new insights for the fabrication of other high-performance photocatalysts.

In-situ Platinum Plasmon Resonance Effect Prompt Titanium Dioxide Nanocube Photocatalytic Hydrogen Evolution.

Herein, Pt-decorated TiO2 nanocube hierarchy structure (Pt-TNCB) was fabricated by a facile solvothermal synthesis and in-situ photodeposition strategy. The Pt-TNCB exhibits an excellent solar-driven photocatalytic hydrogen evolution rate (337.84 µmol h-1 ), which is about 37 times higher than that of TNCB (9.19 µmol h-1 ). Interestingly, its photocatalytic property is still superior to TNCB with post modification Pt (1 wt %) (208.11 µmol h-1 ). The introduction of Pt efficiently extends the photoresponse of the composite material from UV to visible light region, simultaneously boosting their solar-driven photocatalytic performance, which attribute to the porous structure, the sub size TNCB, the SPR effect of Pt NPs and strong interaction of two components. In fact, Pt NPs can enhance collective oscillations on delocalized electrons, which is conducive to capture electrons and hinder the recombination of photogenerated electron-hole pairs, leading to the longer lifetime of photogenerated charges. The fabrication of Pt-TNCB photocatalyst with SPR effect may provide a promising method to improve visible-light photocatalytic activities for traditional photocatalysts.

Enhanced generation of hydroxyl radicals on well-crystallized molybdenum trioxide/nano-graphite anode with sesame cake-like structure for degradation of bio-refractory antibiotic.

Anodic electro-catalysis oxidation is a highly effective way to solve the pollution problem of antibiotics in wastewater and receiving water bodies. In this study, for the first time, molybdenum trioxide/Nano-graphite (MoO3/Nano-G) composites are synthesized as anodic catalysts by a surfactant-assisted solvothermal method followed by low-temperature calcination. The effects of the proportion of MoO3 to Nano-G (10, 30 and 50%) on the properties of composites are investigated through structural characterizations and electrochemical measurements. Results indicate that MoO3(30)/Nano-G electrode displays the electro-catalysis degradation efficiency of 99.9% towards ceftazidime, which is much higher than those of Nano-G (46.7%) and dimensionally stable anode (69.2%). The degradation mechanism for ceftazidime is studied by investigating the yields and kinds of active species. Results show that all of the OH, O2- and H2O2 are responsible for the electro-catalytic degradation process, and the produced OH radicals are the major active species for ceftazidime degradation. The synergistic effects between MoO3 and Nano-G greatly contribute to the activation of H2O molecules to produce OH, meanwhile the special sesame cake-like structure facilitates to the exposure of contaminants to OH on active sites to enhance the degradation efficiency. These results suggest that MoO3/Nano-G electrodes can be considered as the promising catalysts for treating bio-refractory organic wastewater.

In situ synthesis and photoluminescence of Eu3+ doped Y(OH)3@ß-NaYF4 core-shell nanotubes.

Eu(3+) doped Y(OH)(3)@ß-NaYF(4) core-shell nanotubes were prepared by an in situ synthesis method. The photoluminescence properties were studied under different excitation wavelengths. When the excitation wavelength is 363, 380, and 397 nm, the spectral configurations are similar, and are different from that under 414 nm excitation. The peak location of (7)F(0)→(5)D(3) shifted with excitation wavelength, indicating that the nanocrystals have multiple luminescence centers or emitting states.