Ti3C2@g-C3N4/TiO2 Ternary Heterogeneous Photocatalyst for Promoted Photocatalytic Degradation Activities

Abstract

Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4 was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2 MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4 and TiO2 and Schottky barrier presented among TiO2 and Ti3C2 suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2 can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F− here).

Multi-Walled Carbon Nanotubes Modified NiCo2S4 for the Efficient Photocatalytic Reduction of Hexavalent Chromium

“…The other peak with a binding energy of 168.6 eV represented the oxidized S bond, meaning that some surface sulfide ions were oxidized during the XPS test. The C 1s spectrum was decomposed into three characteristic peaks at 288, 285.8, and 284.8 eV (Figure 7e), which could be attributed to the C=O/C=N, C-O/C-N, and C=C/C-C bonds, respectively [70,71]. From the N 1s spectra, the nitrogen atoms contained different oxidation states, including pyridine-N (398.4 eV), pyrrole-N (400.1 eV), and pyridine-Noxide (402.2 eV) (Figure 7f) [72].…”

Enhancing NO degradation in visible light through plasma-treated photocatalytic substrates featuring TiO₂@g-C₃N₄ Z-scheme structure

“…The nitrogen and Ti 3+ defects and oxygen vacancies in the TC nanocomposites improve the light-harvesting ability and prevent rapid electron-hole recombination, enhancing the photocatalytic performance [52]. Additionally, the loose and porous TC heterojunction composite photocatalysts prepared using a template method exhibit a greatly increased specific surface area, improved light absorption performance, and suppressed recombination of photogenerated electrons and holes, resulting in excellent photocatalytic performance [53].…”

“…Additionally, TC exhibited high NO x adsorption capacity and converted NO to nontoxic NO 3 with minimal formation of NO 2 , making it a more effective photocatalyst for NO x removal [70]. The enhanced photocatalytic activity of TC can be attributed to the formation of a double Z-scheme heterojunction, which amplifies the absorption edge and effectively separates electron-hole pairs through the influence of an internal electric field [53]. The synergistic effect of the heterojunction between g-C 3 N 4 and TiO 2 and the Schottky barrier presented among TiO 2 and Ti 3 C 2 in the Ti 3 C 2 @TC ternary photocatalyst also contributes to its superior performance.…”

TiO2-Based Photocatalytic Coatings on Glass Substrates for Environmental Applications

“…Various semiconductor materials have been developed as photocatalysts, such as TiO 2 , g-C 3 N 4 , ZnO, Bi-based, and Ag-based materials [14][15][16][17][18][19][20][21][22][23]. As shown in Figure 1, TiO 2 was the most researched photocatalyst among many semiconductor photocatalysts due to its good photostability, low cost, and environmental friendliness [24][25][26][27]. However, the low photocatalytic efficiency of TiO 2 under visible light limits its practical applications due to the low absorption of visible light and high rate of photogenerated carrier recombination [28][29][30].…”