Pt nanoparticles decorated heterostructured g-C3N4/Bi2MoO6 microplates with highly enhanced photocatalytic activities under visible light

Abstract

Exploring an efficient and photostable heterostructured photocatalyst is a pivotal scientific topic for worldwide energy and environmental concerns. Herein, we reported that Pt decorated g-C 3 N 4 /Bi 2 MoO 6 heterostructured composites with enhanced photocatalytic performance under visible light were simply synthesized by one-step hydrothermal method for methylene blue (MB) dye degradation. Results revealed that the synthetic Pt decorated g-C 3 N 4 /Bi 2 MoO 6 composites with Bi 2 MoO 6 contents of 20 wt.% (Pt@CN/20%BMO) presented the highest photocatalytic activity, exhibiting 7 and 18 times higher reactivity than the pure g-C 3 N 4 and Bi 2 MoO 6 , respectively. Structural analyses showed that Bi 2 MoO 6 microplates were anchored on the wrinkled flower-like g-C 3 N 4 matrix with Pt decoration, leading to a large expansion of specific surface area from 10.79 m 2 /g for pure Bi 2 MoO 6 to 46.09 m 2 /g for Pt@CN/20%BMO. In addition, the Pt@CN/20%BMO composites exhibited an improved absorption ability in the visible light region, presenting a promoted photocatalytic MB degradation. Quenching experiments were also conducted to provide solid evidences for the production of hydroxyl radicals ( • OH), electrons (e − ), holes (h + ) and superoxide radicals ( • O 2− ) during dye degradation. The findings in this critical work provide insights into the synthesis of heterostructured photocatalysts with the optimization of band gaps, light response and photocatalytic performance in wastewater remediation.

Activating oxygen deficient TiO2 in the visible region by Bi2MoO6 for CO2 photoreduction to methanol

“…11 In the case of Bi 2 MoO 6 , the diffraction peaks at 28.25°, 32.59°, 33.07°, 46.72°, 47.07°, 55.46°, 55.53° and 56.16° could be perfectly indexed to the (131), (002), (060), (202), (260), (331), (133) and (191) planes of orthorhombic Bi 2 MoO 6 ( Pca 2 1 ). 12 For the Bi 2 MoO 6 /TiO 2 heterostructures, all of the peaks can be assigned to either TiO 2 or Bi 2 MoO 6 . The absence of extra peaks proves the formation of a pure heterojunction.…”

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

“…The Ag and Au can prevent rapid recombination probability, improve the transfer of a generated electron, and enhance the visible light absorption by the surface plasmon resonance, and can be used for a wide range of applications, especially decontamination of organic pollutants. Bi, Pd, Pt, Ni, and Cd are other metal photocatalysts used for improved photocatalytic activities [357][358][359][360][361][362][363]. Some semiconductors are also used besides the metal oxide-g-C 3 N 4 based composites.…”

Influence of Ag nanoparticles anchored on protonated g-C3N4–Bi2MoO6 nanocomposites for effective antibiotic and organic pollutant degradation

“…Bi 2 MoO 6 was synthesized by a facile hydrothermal method with slight modication. 34 About 0.485 g of Bi(NO 3 ) 3 $5H 2 O and 0.088 g of Na 2 MoO 4 $2H 2 O were dissolved in 40 mL MilliQ-pore water under vigorous stirring for 5 h, followed by sonication for 15 min. The mixture was then transferred into a Teon-lined stainless steel autoclave with a lling volume of 50 mL and heated up to 150 C for 15 h. Aer being dried at room temperature the obtained product was washed with deionized water and absolute ethanol about three times and dried in a hotair oven for 6 h at 80 C. It was further annealed in a muffle furnace at 300 C for 3 h (temperature ramp rate: 5 C min À1 ).…”