Hexagonal 2H-MoSe2 broad spectrum active photocatalyst for Cr(VI) reduction

Abstract

To make full use of the solar energy, exploring broad spectrum active photocatalysts has become one of the core issues for photocatalysis. Here we report a novel hexagonal 2H-MoSe2 photocatalyst with ultraviolet (UV)-visible-near infrared (NIR) light response for the first time. The results indicate that the MoSe2 displays excellent photo-absorption and photocatalytic activity in the reduction of Cr(VI) under UV and visible even NIR light irradiation. MoSe2 synthesized at pH value of 2 achieves the highest Cr(VI) reduction rates of 99%, 91% and 100% under UV, visible and NIR light irradiation, respectively, which should be attributed to its comparatively higher light absorption, efficient charge separation and transfer as well as relatively large number of surface active sites. The excellent broad spectrum active photocatalytic activity makes the MoSe2 to be a promising photocatalyst for the effective utilization of solar energy.

Adsorption of Malachite Green Dye onto Mesoporous Natural Inorganic Clays: Their Equilibrium Isotherm and Kinetics Studies

“…To evaluate the adsorption abilities of NICs adsorbents, batch adsorption experiments were performed using 250 mL conical flasks containing 100 mL of working solutions. The influence of operating parameters such as time (10-120 min), NICs amount (0.1-0.5 g), dye concentration (100-350 mg/L), and pH (3)(4)(5)(6)(7)(8)(9)(10)(11) on MG dye remediation was investigated in batch studies. Typically, 0.1 g of NICs and MG solution (100 mL) with the desired pH and concentration were added to a 250 mL conical flask and stirred continuously.…”

Transition Metal Dichalcogenides for the Application of Pollution Reduction: A Review

“…As the majority of water treatment facilities are located outdoors, the availability of solar energy can be useful for photocatalytic technology in water treatment. Chu et al [198] reported that the development of hexagonal 2H-MoSe 2 photocatalyst exhibits outstanding photo-absorption and photocatalytic reaction in reducing hexavalent chromium (Cr(VI)) under ultraviolet (UV) light. The 2H-MoSe 2 yields 99% Cr(VI) reduction rate with the presence of UV light.…”

Data on novel C fibers@MoSe2 nanoplates core–shell composite for highly efficient solar-driven photocatalytically degrading environmental pollutants

“… Catalysts Light source Light intensity (mW/cm 2 ) Catalyst concentration (g/L) Stirring Decolourization rate k (min -1 ) Recycling times Refs. C fiber@MoSe 2 NPCSC 5 W LED lamp 36 1 no 34.7% in 120 min 0.0034 3 [1] C quantum dots decorated MoSe 2 300 W Xe lamp λ ≥ 400 nm 741 1 yes 99% in 180 min 0.026 3 [9] Hexagonal 2H-MoSe 2 nanoparticles 300 W Xe lamp λ ≥ 400 nm 741 1 yes 94% in 180 min 0.027 3 [10] MoSe 2 nanosheets/TiO 2 nanoparticles composite 400 W metal halogen lamp λ ≥ 400 nm – 1 yes 91% in 120 min 0.0141 – [11] MoSe 2 nanoparticles 400 W metal halogen lamp λ ≥ 400 nm – 1 yes 95% in 250 min – 5 [12] 3D MoS 2 /r-GO aerogel 300 W Xe lamp 545 0.67 yes 92% in 120 min – – [13] 2D MoS 2 nanosheet coated Bi 2 S 3 discoids 300 W Xe lamp λ ≥ 400 nm 700 0.25 yes 97% in 30 min – 3 [14] …”