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<p>CuBi<sub>2</sub>O<sub>4</sub> has been widely explored for dye degradation owing to its favorable visible-light responsiveness; however, its photocatalytic efficiency is strongly influenced by morphology, thereby limiting its broader applicability. In this study, mesoporous CuBi<sub>2</sub>O<sub>4</sub> (CBO) nanocuboid rods were successfully synthesized via a hydrothermal route to investigate morphology-driven enhancement in photocatalytic performance toward Acid Orange 7 (AO7) degradation. The well-defined nanocuboid rod architecture provided improved structural stability and accessible surface-active sites. The CBO nanocuboid rods exhibited a crystallite size of 21&#xa0;nm, a specific surface area of 2.151 m<sup>2</sup>/g, and a mesoporous structure with a pore size of 3&#xa0;nm and a pore volume of 0.0077747 cm<sup>3</sup>/g. Under visible light irradiation, 0.01&#xa0;g/L of CBO nanocuboid rods achieved 99.5% degradation of 20&#xa0;mg/L AO7 (200&#xa0;mL) within 180&#xa0;min, surpassing the degradation capabilities of other photocatalysts. The degradation kinetics followed a pseudo-first-order model with a rate constant of 0.02755&#xa0;min<sup>–1</sup>. Electron paramagnetic resonance (EPR) and radical scavenging experiments confirmed that both hydroxyl (•OH) and superoxide (O<sub>2</sub>•⁻) radicals, along with photogenerated holes (h⁺), play dominant roles in the degradation process. The CBO nanocuboid rods demonstrated excellent reusability, maintaining 93.2% of their initial degradation efficiency after four consecutive regeneration cycles. These findings highlight the critical role of nanocuboid rod morphology in enhancing charge transfer dynamics and photocatalytic efficiency, providing insight into morphology-engineered CBO systems for sustainable wastewater treatment.</p>

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Mesoporous CuBi2O4 nanocuboids engineered for enhanced photocatalytic degradation of acid orange 7 dye

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Ubaid Sidiqi,
  • Dinesh Kumar

摘要

CuBi2O4 has been widely explored for dye degradation owing to its favorable visible-light responsiveness; however, its photocatalytic efficiency is strongly influenced by morphology, thereby limiting its broader applicability. In this study, mesoporous CuBi2O4 (CBO) nanocuboid rods were successfully synthesized via a hydrothermal route to investigate morphology-driven enhancement in photocatalytic performance toward Acid Orange 7 (AO7) degradation. The well-defined nanocuboid rod architecture provided improved structural stability and accessible surface-active sites. The CBO nanocuboid rods exhibited a crystallite size of 21 nm, a specific surface area of 2.151 m2/g, and a mesoporous structure with a pore size of 3 nm and a pore volume of 0.0077747 cm3/g. Under visible light irradiation, 0.01 g/L of CBO nanocuboid rods achieved 99.5% degradation of 20 mg/L AO7 (200 mL) within 180 min, surpassing the degradation capabilities of other photocatalysts. The degradation kinetics followed a pseudo-first-order model with a rate constant of 0.02755 min–1. Electron paramagnetic resonance (EPR) and radical scavenging experiments confirmed that both hydroxyl (•OH) and superoxide (O2•⁻) radicals, along with photogenerated holes (h⁺), play dominant roles in the degradation process. The CBO nanocuboid rods demonstrated excellent reusability, maintaining 93.2% of their initial degradation efficiency after four consecutive regeneration cycles. These findings highlight the critical role of nanocuboid rod morphology in enhancing charge transfer dynamics and photocatalytic efficiency, providing insight into morphology-engineered CBO systems for sustainable wastewater treatment.