Visible Light Induced g-C3N4/TiO2/Ti3C2Ternary Z-scheme Heterojunction Photocatalyst for Efficient Degradation

Abstract: Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C₃N₄/TiO₂/Ti₃C₂photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C₃N₄and TiO₂dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti₃C₂, as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO₂generated by hydrothermal oxidation and g-C₃N₄with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO₂/Ti₃C₂is 80 mg and calcined at 450 ℃ for 4 h, g-C₃N₄/TiO₂/Ti₃C₂has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C₃N₄and 14.55 times that of Ti₃C₂, respectively. This work illustrates that g-C₃N₄/TiO₂/Ti₃C₂has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract: <fig id="Figa" position="anchor"> <graphic position="anchor" specific-use="HTML" mime-subtype="PNG" href="MediaObjects/13391_2022_377_Figa_HTML.png"></graphic> </fig>