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Abstract <p>In this study, TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> QDs material was fabricated by anchoring between TiO<sub>2</sub> particles prepared by sol-gel method from TiCl<sub>4</sub> salt and g-C<sub>3</sub>N<sub>4</sub> quantum dots synthesized by hydrothermal method from g-C<sub>3</sub>N<sub>4</sub> nanosheets. As-synthesized materials were characterized by surface properties using methods such as XRD, EDX, FESEM, TEM, and UV vis DRS. Some factors like pH, illumination time, ratio of catalyst mass and volume affecting the degradation efficiency of 2,4-dichlorophenoxyacetic acid over TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> QDs material were also investigated. The as-synthesized material represented excellent photocatalytic performance for degradation of 2,4-dichlorophenoxyacetic acid under illumination. The 2,4-D degradation efficiency reached 99% after 180 min of illumination over TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub>QDs (5.0 mL) material. The enhanced photocatalytic activity could contribute to the synergistic effect of the charge transfer and separation and a lower band gap. Moreover, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6314_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="33" /> </InlineMediaObject> <EquationSource Format="TEX">\({}^{ \bullet }{\text{OH}}\)</EquationSource> <!--PhysChA2570208Lan-m1--> </InlineEquation>, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6314_Article_IEq2.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="31" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{O}}_{2}^{{ \bullet - }}\)</EquationSource> <!--PhysChA2570208Lan-m2--> </InlineEquation> radicals were demonstrated to be dominant active radicals during the 2,4-D degradation.</p>

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TiO2 Modified g-C3N4 Quantum Dots: Characteristics and Photocatalytic Performance for Removal of 2,4-Dichlorophenoxyacetic Acid

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Phung Thi Lan,
  • Nguyen Thi Huyen,
  • Nguyen Thi Kim Giang

摘要

Abstract

In this study, TiO2/g-C3N4 QDs material was fabricated by anchoring between TiO2 particles prepared by sol-gel method from TiCl4 salt and g-C3N4 quantum dots synthesized by hydrothermal method from g-C3N4 nanosheets. As-synthesized materials were characterized by surface properties using methods such as XRD, EDX, FESEM, TEM, and UV vis DRS. Some factors like pH, illumination time, ratio of catalyst mass and volume affecting the degradation efficiency of 2,4-dichlorophenoxyacetic acid over TiO2/g-C3N4 QDs material were also investigated. The as-synthesized material represented excellent photocatalytic performance for degradation of 2,4-dichlorophenoxyacetic acid under illumination. The 2,4-D degradation efficiency reached 99% after 180 min of illumination over TiO2/g-C3N4QDs (5.0 mL) material. The enhanced photocatalytic activity could contribute to the synergistic effect of the charge transfer and separation and a lower band gap. Moreover, \({}^{ \bullet }{\text{OH}}\) , \({\text{O}}_{2}^{{ \bullet - }}\) radicals were demonstrated to be dominant active radicals during the 2,4-D degradation.