SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, China; School of Environment, South China Normal University, University Town, Guangzhou, 510006, China.
SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, China; School of Environment, South China Normal University, University Town, Guangzhou, 510006, China.
Chemosphere. 2020 Oct;256:127061. doi: 10.1016/j.chemosphere.2020.127061. Epub 2020 May 12.
Cobalt is part of vitamin B12, which is essential to maintain human health, and trace levels of cobalt ions are ubiquitous in water and soil environments. In this study, the destruction of 1,4-dioxane (1,4-D) by peroxymonosulfate (PMS) under the catalysis of trace levels of Co was investigated under buffered conditions. The results showed that near 100% removal of 1,4-D was achieved after reaction for 6 and 10 min with 50 and 25 μg/L Co, respectively, in the presence of 5 mM phosphate ions. Mechanism studies revealed that radicals mediated the destruction of 1,4-D and sulfate radicals were the primary reactive species. The traces of Co had the greatest reactivity for the catalysis of PMS in neutral environments (pH 7.0). However, pH 5.5 was observed to be the best condition for 1,4-D destruction, which was probably caused by the involvement of phosphate radicals. Common water components including chloride ions and bicarbonate ions were observed to have promoting and inhibiting effects, respectively, on the removal of 1,4-D. To further demonstrate the potential of Co-PMS in practical applications, we explored the simultaneous degradation of 20 antibiotics using trace levels of Co. The results showed that all the investigated antibiotics, except for lomefloxacin, could be efficiently degraded by Co-PMS with removal rates of greater than 97%. The findings from this study demonstrate the promise of using trace levels of cobalt for environmental remediation applications, even when high concentrations of phosphate ions are co-present.
钴是维生素 B12 的一部分，而维生素 B12 对维持人体健康至关重要，痕量钴离子在水和土壤环境中普遍存在。在本研究中，在缓冲条件下，研究了痕量钴离子催化下过一硫酸盐（PMS）对 1,4-二恶烷（1,4-D）的破坏作用。结果表明，在 5 mM 磷酸盐离子存在下，分别用 50 和 25 μg/L 的 Co 反应 6 和 10 min 后，1,4-D 的去除率接近 100%。机理研究表明，自由基介导了 1,4-D 的破坏，而硫酸根自由基是主要的反应性物质。在中性环境（pH 7.0）中，痕量 Co 对 PMS 的催化具有最大的反应性。然而，pH 5.5 被观察为 1,4-D 破坏的最佳条件，这可能是由于磷酸盐自由基的参与。常见的水成分，包括氯离子和碳酸氢根离子，分别对 1,4-D 的去除具有促进和抑制作用。为了进一步证明 Co-PMS 在实际应用中的潜力，我们探索了使用痕量 Co 同时降解 20 种抗生素。结果表明，除洛美沙星外，所有研究的抗生素都可以通过 Co-PMS 高效降解，去除率大于 97%。本研究结果表明，即使存在高浓度的磷酸盐离子，痕量钴也可用于环境修复应用。
