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<p>A low-temperature liquid-phase methodology was utilized to synthesize bismuth oxychloride (BiOCl) nanosheets and copper oxide/bismuth oxychloride (Cu<sub>2</sub>O/BiOCl) nano-heterojunctions with high visible light photocatalytic efficiency. Advanced analytical techniques were used to analyze their composition, microstructure, and morphology. The photocatalytic performance of the nano-heterojunction was evaluated for Methylene Blue (MB) dye degradation under visible light irradiation using an LED-light source (9W), which demonstrated a superior degradation efficiency of 99% in comparison to the BiOCl photocatalyst (36.56% degradation). The effect of catalyst dosage (3–15&#xa0;mg) revealed a dose-dependent degradation, with the highest efficiency (99%) at 3 mg dosage. The degradation process was found to obey pseudo-first-order kinetics (<i>k</i>&#xa0;=&#xa0;0.0016 min<sup>−1</sup>), with a regression coefficient of <i>R</i><sup>2</sup>&#xa0;=&#xa0;0.946. Radical scavenging assays and mass spectrometry (MS) studies indicated that the degradation process involved a triadic pathway driven by <sup>•</sup>OH and <sup>•</sup>O<sup>2−</sup>. Further, the stability and reusability assessments through cycling and leaching tests confirmed the stable nature and reusability of the photocatalyst. The findings of the study concluded that the Cu<sub>2</sub>O/BiOCl heterojunction serves as an effective catalyst for the degradation of MB dye in MB-laden effluents owing to its high stability, strong photocatalytic activity, ease of preparation, and potential to be up-scaled for industrial and domestic use.</p>

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Investigation of photocatalytic activity, kinetics and mechanism of degradation of methylene blue by Cu2O/BiOCl heterojunction

  • 期刊论文

  • 发表日期：

    2025年9月7日

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  • Sobandhar Prakash Bharath Kumar,
  • Ningappa Kumara Swamy

摘要

A low-temperature liquid-phase methodology was utilized to synthesize bismuth oxychloride (BiOCl) nanosheets and copper oxide/bismuth oxychloride (Cu2O/BiOCl) nano-heterojunctions with high visible light photocatalytic efficiency. Advanced analytical techniques were used to analyze their composition, microstructure, and morphology. The photocatalytic performance of the nano-heterojunction was evaluated for Methylene Blue (MB) dye degradation under visible light irradiation using an LED-light source (9W), which demonstrated a superior degradation efficiency of 99% in comparison to the BiOCl photocatalyst (36.56% degradation). The effect of catalyst dosage (3–15 mg) revealed a dose-dependent degradation, with the highest efficiency (99%) at 3 mg dosage. The degradation process was found to obey pseudo-first-order kinetics (k = 0.0016 min−1), with a regression coefficient of R2 = 0.946. Radical scavenging assays and mass spectrometry (MS) studies indicated that the degradation process involved a triadic pathway driven by •OH and •O2−. Further, the stability and reusability assessments through cycling and leaching tests confirmed the stable nature and reusability of the photocatalyst. The findings of the study concluded that the Cu2O/BiOCl heterojunction serves as an effective catalyst for the degradation of MB dye in MB-laden effluents owing to its high stability, strong photocatalytic activity, ease of preparation, and potential to be up-scaled for industrial and domestic use.