The use of transition metal-activated peroxymonosulfate (PMS) as an advanced oxidation technology has gained recognition. This study developed a catalyst using cobalt–lanthanum bimetallic oxide supported on layered molybdenum disulfide (MoS2) as a carrier. The Co–La/MoS2 catalyst was synthesised through coprecipitation, followed by calcination with an optimised metal ratio of Co:La = 2:1 to activate PMS and degrade trace chloramphenicol (CAP) in water. The chemical composition of the catalyst was confirmed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). At catalyst and PMS dosages of 0.1 and 0.5 g·L−1, respectively, the degradation rate of CAP was 95% within 30 min. The catalyst exhibited strong resistance to most interfering anions and maintained a high degradation rate at pH 3–11. Liquid chromatography–mass spectrometry analysis revealed the potential degradation pathways of CAP in the Co–La/MoS2 (2:1)/PMS system. For other pollutants, such as oxytetracycline, complete degradation was achieved within 20 min, demonstrating the broad applicability of the Co–La/MoS2 (2:1)/PMS system for the degradation and removal of antibiotic organic contaminants. This study offers a feasible approach for the degradation of antibiotic organic pollutants, including CAP, in natural water bodies.
Graphical abstract
摘要
过渡金属活化的过氧单硫酸盐作为一种先进的氧化技术得到了广泛的应用。本研究开发了一种以层状二硫化钼为载体的钴镧双金属氧化物催化剂。通过共沉淀法合成Co - La/MoS2催化剂, 然后以Co:La = 2:1的优化金属比煅烧, 激活过氧单硫酸盐并降解水中痕量氯霉素。用x射线衍射和x射线光电子能谱法确定了催化剂的化学成分。在催化剂和过氧单硫酸盐用量分别为0.1和0.5 g·L−1时, 氯霉素在30分钟内的降解率为95%。催化剂对大多数干扰阴离子具有较**的抗性, 在pH范围 3-11内保持较高的降解率。液相色谱-质谱分析揭示了Co-La /MoS2 (2:1)/PMS体系中CAP的潜在降解途径。对于其他污染物, 如土霉素, 在20分钟内完全降解, 证明了Co-La /MoS2 (2:1)/PMS系统在降解和去除抗生素有机污染物方面的广泛适用性。本研究为天然水体中包括氯霉素的抗生素有机污染物降解提供了一条可行的途径。
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Acknowledgements
This study was financially supported by the National Key R&D Program of China (No. 2019YFC1804400) and the Double First-Class University Plan (No. C176220100042).
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Fan, YN., Zhang, YQ., Gao, SS. et al. Enhanced activation of peroxymonosulfate on layered molybdenum disulfide loaded with Co–La bimetallic oxide for efficient degradation of chloramphenicol. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02737-2
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DOI: https://doi.org/10.1007/s12598-024-02737-2