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<p>Novel polydopamine-modified MoS<sub>2</sub>/ZIF-67 composite (PDA@MoS<sub>2</sub>/ZIF-67) was fabricated to enhance peroxymonosulfate (PMS) activation efficiency and achieve efficient removal of tetracycline hydrochloride (TCH) from wastewater. The as-prepared catalyst was adopted to activate PMS for TCH degradation, and the catalytic performance, reactive oxygen species (ROS) evolution, degradation mechanism, and reusability were systematically explored. Under optimal conditions (20&#xa0;°C, initial pH = 6.2, catalyst dosage 40&#xa0;mg/L, PMS concentration 0.9&#xa0;mM), over 96.6% of 10&#xa0;mg/L TCH was degraded within 40&#xa0;min. The ROS capture tests along with electron paramagnetic resonance (EPR) analyses indicated that multiple ROS, including singlet oxygen (<sup>1</sup>O<sub>2</sub>), sulfate radicals (SO<sub>4</sub><sup>·−</sup>), superoxide anions (O<sub>2</sub><sup>·−</sup>), and hydroxyl radicals (<sup>·</sup>OH), were formed in the PDA@MoS<sub>2</sub>/ZIF-67/PMS system. The excellent catalytic performance stemmed from the accelerated Co<sup>3+</sup>/Co<sup>2+</sup> and Mo<sup>6+</sup>/Mo<sup>4+</sup> redox cycles induced by polydopamine and low-valent sulfur species, as well as their synergistic catalytic effect. After ten cycling tests, the TCH removal efficiency remained above 79.1%, revealing good reusability of PDA@MoS<sub>2</sub>/ZIF-67. This study provides a high-efficiency composite catalyst for PMS activation and offers a promising strategy for the remediation of antibiotic-contaminated wastewater.</p>

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Activation of peroxymonosulfate by polydopamine-decorated MoS2/ZIF-67 composite for efficient decomposition of tetracycline hydrochloride in wastewater

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Xinyu Liu,
  • Dedong Sun,
  • Hongchao Ma,
  • Guowen Wang,
  • Xinxin Zhang,
  • Jun Hao

摘要

Novel polydopamine-modified MoS2/ZIF-67 composite (PDA@MoS2/ZIF-67) was fabricated to enhance peroxymonosulfate (PMS) activation efficiency and achieve efficient removal of tetracycline hydrochloride (TCH) from wastewater. The as-prepared catalyst was adopted to activate PMS for TCH degradation, and the catalytic performance, reactive oxygen species (ROS) evolution, degradation mechanism, and reusability were systematically explored. Under optimal conditions (20 °C, initial pH = 6.2, catalyst dosage 40 mg/L, PMS concentration 0.9 mM), over 96.6% of 10 mg/L TCH was degraded within 40 min. The ROS capture tests along with electron paramagnetic resonance (EPR) analyses indicated that multiple ROS, including singlet oxygen (1O2), sulfate radicals (SO4·−), superoxide anions (O2·−), and hydroxyl radicals (·OH), were formed in the PDA@MoS2/ZIF-67/PMS system. The excellent catalytic performance stemmed from the accelerated Co3+/Co2+ and Mo6+/Mo4+ redox cycles induced by polydopamine and low-valent sulfur species, as well as their synergistic catalytic effect. After ten cycling tests, the TCH removal efficiency remained above 79.1%, revealing good reusability of PDA@MoS2/ZIF-67. This study provides a high-efficiency composite catalyst for PMS activation and offers a promising strategy for the remediation of antibiotic-contaminated wastewater.