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With the growing demand for efficient environmental remediation technologies, photocatalytic degradation of volatile organic compounds (VOCs) such as toluene has garnered considerable attention. However, the relatively low activity of conventional Bi2O2CO3-based photocatalysts remains a major limitation. In this study, we address this challenge by modulating the microstructure of Bi2O2CO3 nanosheets, successfully converting the tightly packed structure into a multi-directionally stacked configuration. This morphological transformation significantly enhances photocatalytic performance, achieving a toluene degradation efficiency of 52.8%, in contrast to 16.2% for the unmodified sample. Mechanistic investigations (UV–vis, photocurrent test, and ESR) reveal that the enhanced activity arises from improved light absorption, more efficient separation and transfer of photogenerated charge carriers, and increased generation of superoxide radicals (∙O2−). These factors collectively promote the oxidative transformation of toluene into benzene-ring-containing intermediates.

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Multidirectional Stacking of Bi2O2CO3 Nanosheets Enables Efficient Photocatalytic Toluene Degradation

  • 会议论文

  • 发表日期：

    2026年

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  • Hong Wang,
  • Shujun Liu,
  • Xin Zhang

摘要

With the growing demand for efficient environmental remediation technologies, photocatalytic degradation of volatile organic compounds (VOCs) such as toluene has garnered considerable attention. However, the relatively low activity of conventional Bi2O2CO3-based photocatalysts remains a major limitation. In this study, we address this challenge by modulating the microstructure of Bi2O2CO3 nanosheets, successfully converting the tightly packed structure into a multi-directionally stacked configuration. This morphological transformation significantly enhances photocatalytic performance, achieving a toluene degradation efficiency of 52.8%, in contrast to 16.2% for the unmodified sample. Mechanistic investigations (UV–vis, photocurrent test, and ESR) reveal that the enhanced activity arises from improved light absorption, more efficient separation and transfer of photogenerated charge carriers, and increased generation of superoxide radicals (∙O2−). These factors collectively promote the oxidative transformation of toluene into benzene-ring-containing intermediates.