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

Area of Science:

• Materials Science
• Photocatalysis
• Environmental Chemistry

Background:

• Efficient solar energy utilization requires broad-spectrum active photocatalysts.
• Photocatalysis is crucial for environmental remediation and energy conversion.
• Hexagonal 2H-molybdenum diselenide (MoSe2) is explored for its unique properties.

Purpose of the Study:

• To report a novel hexagonal 2H-MoSe2 photocatalyst with ultraviolet (UV)-visible-near infrared (NIR) light response.
• To evaluate the photocatalytic activity of MoSe2 in the reduction of Cr(VI) under broad spectrum light irradiation.
• To understand the factors contributing to the enhanced photocatalytic performance.

Main Methods:

• Synthesis of hexagonal 2H-MoSe2 photocatalyst at a specific pH value (pH 2).
• Photocatalytic reduction of Cr(VI) under UV, visible, and NIR light irradiation.
• Characterization of material properties including light absorption, charge separation, and surface active sites.

Main Results:

• The synthesized MoSe2 exhibited excellent photo-absorption and photocatalytic activity across UV, visible, and NIR light.
• MoSe2 synthesized at pH 2 achieved high Cr(VI) reduction rates: 99% (UV), 91% (visible), and 100% (NIR).
• The high performance is attributed to superior light absorption, efficient charge dynamics, and abundant active sites.

Conclusions:

• Hexagonal 2H-MoSe2 is a novel, broad-spectrum active photocatalyst with significant potential for solar energy applications.
• The material demonstrates excellent efficiency in Cr(VI) reduction under diverse light conditions.
• This discovery opens avenues for advanced photocatalytic processes utilizing the full solar spectrum.