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<p>In this work, the CoMn-LDH/GO nanocomposite with CoMn-LDH particle size of 75–100 nm on the GO sheets was successfully synthesized and employed as a heterogeneous catalytic material to remove methylene blue (MB) in water through peroxymonosulfate activation. More than 98% of MB (50 mg/L) and 51.68% of COD were removed in 8 min at a low catalyst dosage of 40 mg/L, low PMS concentration of 0.814 mM, wide pH range of 3–9, and reduced Co leaching of 3.35 times, with <sup>1</sup>O<sub>2</sub> played a decisive role in MB degradation. The MB degradation rate constant by the CoMn-LDH/GO/PMS system was 0.552 min<sup>−1</sup>, which was 2.6, 35.34, and 128.37 times higher than that of the MnCo-LDH/PMS, GO/PMS, and PMS systems, respectively, attributed to the synergistic effect of CoMn-LDH and GO. The MB degradation pathway was also revealed via DFT calculations and intermediate analysis. Since CoMn-LDH/GO gave excellent degradation towards various antibiotics and dyes, it would have good application prospects in treating different groups of organic pollutants.</p>

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Efficient activation of peroxymonosulfate by CoMn-LDH/GO for the degradation of dyes and antibiotics in water

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Nguyen Trung Dung,
  • Nguyen Thi Cam Tien,
  • Phung Thi Thu,
  • Vu Dinh Thao,
  • Nguyen Phuong Thao,
  • Phan Thi Thuy,
  • Le Viet Ngan,
  • Nguyen Thi Thuy,
  • Kun-Yi Andrew Lin,
  • Nguyen Nhat Huy

摘要

In this work, the CoMn-LDH/GO nanocomposite with CoMn-LDH particle size of 75–100 nm on the GO sheets was successfully synthesized and employed as a heterogeneous catalytic material to remove methylene blue (MB) in water through peroxymonosulfate activation. More than 98% of MB (50 mg/L) and 51.68% of COD were removed in 8 min at a low catalyst dosage of 40 mg/L, low PMS concentration of 0.814 mM, wide pH range of 3–9, and reduced Co leaching of 3.35 times, with 1O2 played a decisive role in MB degradation. The MB degradation rate constant by the CoMn-LDH/GO/PMS system was 0.552 min−1, which was 2.6, 35.34, and 128.37 times higher than that of the MnCo-LDH/PMS, GO/PMS, and PMS systems, respectively, attributed to the synergistic effect of CoMn-LDH and GO. The MB degradation pathway was also revealed via DFT calculations and intermediate analysis. Since CoMn-LDH/GO gave excellent degradation towards various antibiotics and dyes, it would have good application prospects in treating different groups of organic pollutants.