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Nitrogen and Sulfur Co-Doped Graphene Quantum Dots Anchored TiO2 Nanocomposites for Enhanced Photocatalytic Activity

Jishu RawalDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaUrooj KamranDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaMira ParkCarbon Composite Energy Nanomaterials Research Center, Woosuk University, Wanju, Chonbuk 55338, KoreaBishweshwar PantCarbon Composite Energy Nanomaterials Research Center, Woosuk University, Wanju, Chonbuk 55338, KoreaSoo‐Jin ParkDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea

2022en

ABI

Annotatsiya

Herein, nitrogen (N) and sulfur (S) co-doped graphene quantum dots (GQDs) using different one-dimensional (1-D) carbon nanomaterials as precursors were synthesized, followed by heterojunction formation with TiO2. GQDs exhibit unlike physiochemical properties due to the disproportionate ratio of N and S heteroatoms and dissimilar reaction parameters. Tailored type-II band gap (Eg) alignment was formed with narrowed Eg value that improves photogenerated electron transfer due to π-conjugation. GQDs-TiO2 nanocomposites exhibit remarkably high methylene blue (MB) degradation up to 99.78% with 2.3–3 times elevated rate constants as compared with TiO2. CNF-GQDs-TiO2 demonstrates the fastest MB degradation (60 min) due to the synergistic effect of nitrogen and sulfur doping, and is considered the most stable photocatalyst among prepared nanocomposites as tested up to three cyclic runs. Whereas, C–O–Ti bonds were not only responsible for nanocomposites strengthening but also provide a charge transfer pathway. Moreover, charge transport behavior, generation of active species, and reaction mechanism were scrutinized via free-radical scavenger analysis.

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DOI: 10.3390/catal12050548

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