研究目的
Investigating the photocatalytic effects of carbon-doped TiO2 coupled with g-C3N4 on hydrogen production under visible light.
研究成果
The C-TiO2/g-C3N4 photocatalysts exhibit significantly enhanced photocatalytic hydrogen generation activity under visible light, attributed to the intimate heterojunction between C-TiO2 and g-C3N4, which facilitates efficient charge transfer and inhibits recombination of photogenerated electrons and holes. The study provides a new method for designing visible-light-response heterojunction photocatalysts based on MXene materials.
研究不足
The study focuses on the photocatalytic hydrogen production under visible light and does not explore the effects under UV light or other conditions. The stability and long-term performance of the photocatalysts in practical applications are not extensively discussed.
1：Experimental Design and Method Selection:
The study involved the synthesis of C-TiO2/g-C3N4 photocatalysts through a one-step heat treatment method using MXene-Ti3C2 as a precursor for carbon-doped TiO2 without extra carbon addition. The photocatalytic hydrogen production activity was evaluated under visible light irradiation.
2：Sample Selection and Data Sources:
Ti3AlC2 was used to prepare Ti3C2 MXene, which was then calcined to produce C-TiO2. Bulk g-C3N4 was synthesized by calcining melamine. The composite photocatalysts were prepared by mixing g-C3N4 and Ti3C2 in different ratios followed by calcination.
3：Bulk g-C3N4 was synthesized by calcining melamine. The composite photocatalysts were prepared by mixing g-C3N4 and Ti3C2 in different ratios followed by calcination.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Muffle furnace for calcination, X-ray diffractometer (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometer, and a photocatalytic H2 generation system. Materials included Ti3AlC2, melamine, and hydrofluoric acid.
4：Experimental Procedures and Operational Workflow:
Ti3C2 was prepared by etching Ti3AlC2 with HF, followed by calcination to produce C-TiO2. g-C3N4 was synthesized by calcining melamine. The composite photocatalysts were prepared by mixing g-C3N4 and Ti3C2, followed by calcination. Photocatalytic hydrogen production tests were conducted under visible light irradiation.
5：g-C3N4 was synthesized by calcining melamine. The composite photocatalysts were prepared by mixing g-C3N4 and Ti3C2, followed by calcination. Photocatalytic hydrogen production tests were conducted under visible light irradiation.
Data Analysis Methods:
5. Data Analysis Methods: The photocatalytic activity was evaluated by measuring the volume of generated H2 using gas chromatography. The materials were characterized using XRD, TEM, SEM, XPS, and UV-Vis DRS.
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