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<p>The discharge of untreated, harmful chemicals and toxic dyes into water bodies poses a significant threat to the environment, wildlife, and human civilization. Therefore, the development of effective and sustainable methodologies to treat these toxic dyes and chemicals is of paramount importance. This study describes a low-cost and highly efficient photocatalytic dye degradation process comprising of nontoxic carbon quantum dots (CQDs) decorated titanium dioxide nanotubes (TiO<sub>2</sub> NTs). CQDs were synthesized through the electrochemical exfoliation of graphite rods, while nanotubes were fabricated via the electrochemical anodization of Ti foils. Subsequently, CQDs were attached to the surface of NTs by electrochemical deposition. The surface morphology, crystalline structure, chemical bonding, and optical properties of the samples were comprehensively investigated. The photocatalytic activities of pristine and CQDs decorated NTs were studied by the decomposition of methylene blue (MB) dye under visible and direct sunlight. The CQDs sensitized NTs demonstrated superior dye degradation efficiency (91%,) compared to pristine NTs (61%). In addition, this study also demonstrated the improved photoelectrochemical performance of the CQD-sensitized NTs.</p>

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Electrochemically grown carbon quantum dots sensitized TiO2 nanotubes for enhanced photocatalytic dye degradation and photosensing applications

  • 期刊论文

  • 发表日期：

    2026年4月25日

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  • Sudipta Das,
  • Anabadya Dash,
  • Anwesha Deb,
  • Binoy Das,
  • Tanmoy Majumder,
  • Suvra Prakash Mondal

摘要

The discharge of untreated, harmful chemicals and toxic dyes into water bodies poses a significant threat to the environment, wildlife, and human civilization. Therefore, the development of effective and sustainable methodologies to treat these toxic dyes and chemicals is of paramount importance. This study describes a low-cost and highly efficient photocatalytic dye degradation process comprising of nontoxic carbon quantum dots (CQDs) decorated titanium dioxide nanotubes (TiO2 NTs). CQDs were synthesized through the electrochemical exfoliation of graphite rods, while nanotubes were fabricated via the electrochemical anodization of Ti foils. Subsequently, CQDs were attached to the surface of NTs by electrochemical deposition. The surface morphology, crystalline structure, chemical bonding, and optical properties of the samples were comprehensively investigated. The photocatalytic activities of pristine and CQDs decorated NTs were studied by the decomposition of methylene blue (MB) dye under visible and direct sunlight. The CQDs sensitized NTs demonstrated superior dye degradation efficiency (91%,) compared to pristine NTs (61%). In addition, this study also demonstrated the improved photoelectrochemical performance of the CQD-sensitized NTs.