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<p>Photocatalysis technologies for degrading organic pollutants have emerged as a promising strategy for environmental remediation. This study aimed to develop efficient photocatalysts by synthesizing TiO<sub>2</sub>-loaded composites derived from CuZnAl layered double hydroxides (LDHs) and assessed their performance in the decomposition of rhodamine B (RhB). CuZnAl-LDH nanosheets were synthesized via coprecipitation and then calcined at high temperatures to obtain CuZnAl layered double oxides (CZA-LDO). By varying the amount of ascorbic acid, the CuO in CZA-LDO was reduced to different extents, thereby varying the ratio of Cu, Cu<sub>2</sub>O and CuO. TiO<sub>2</sub> was then deposited on the surface. The morphology, crystal structure, bonding state, and photocatalytic performance of the composite materials were assessed. When exposed to UV light, the optimized TiO<sub>2</sub>/Cu–Cu<sub>2</sub>O–CuO–0.7 composite material achieved a degradation rate of 96.0% for RhB within 110&#xa0;min, which was significantly better than TiO<sub>2</sub>/CZA-LDO (46.0%) and other Cu-modified samples (66.2%–77.9%). The enhanced photocatalytic properties of the prepared nanocomposite were ascribed to doping with Cu, Cu<sub>2</sub>O and CuO, which effectively enhanced the electron–hole pair separation efficiency. These findings demonstrate the potential of Cu-Cu<sub>2</sub>O-CuO-LDO-based photocatalysts as effective materials for degrading organic contaminants in environmental remediation.</p> Graphical abstract <p></p>

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Enhanced photocatalytic activity of TiO2-loaded composite oxides with different Cu–Cu2O–CuO ratios derived from CuZnAl layered double hydroxides

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Meiru Zheng,
  • Ying Liu,
  • Peng Qiao,
  • Xueqin Wang,
  • Xin Guo,
  • Mei Zhang,
  • Jiaojing Zhang,
  • Jianwei Zhang,
  • Fuping Feng

摘要

Photocatalysis technologies for degrading organic pollutants have emerged as a promising strategy for environmental remediation. This study aimed to develop efficient photocatalysts by synthesizing TiO2-loaded composites derived from CuZnAl layered double hydroxides (LDHs) and assessed their performance in the decomposition of rhodamine B (RhB). CuZnAl-LDH nanosheets were synthesized via coprecipitation and then calcined at high temperatures to obtain CuZnAl layered double oxides (CZA-LDO). By varying the amount of ascorbic acid, the CuO in CZA-LDO was reduced to different extents, thereby varying the ratio of Cu, Cu2O and CuO. TiO2 was then deposited on the surface. The morphology, crystal structure, bonding state, and photocatalytic performance of the composite materials were assessed. When exposed to UV light, the optimized TiO2/Cu–Cu2O–CuO–0.7 composite material achieved a degradation rate of 96.0% for RhB within 110 min, which was significantly better than TiO2/CZA-LDO (46.0%) and other Cu-modified samples (66.2%–77.9%). The enhanced photocatalytic properties of the prepared nanocomposite were ascribed to doping with Cu, Cu2O and CuO, which effectively enhanced the electron–hole pair separation efficiency. These findings demonstrate the potential of Cu-Cu2O-CuO-LDO-based photocatalysts as effective materials for degrading organic contaminants in environmental remediation.

Graphical abstract