School of Architecture, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu, 41566, South Korea.
School of Architecture, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu, 41566, South Korea.
Chemosphere. 2020 Jul;250:126251. doi: 10.1016/j.chemosphere.2020.126251. Epub 2020 Feb 19.
Sorption onto clays (montmorillonite and kaolinite), oxidation and sorption by manganese oxides (synthesized MnO and natural MnO), and coupled sorption-oxidation experiments were conducted for the removal of antibiotics sulfadiazine (SDZ) and ciprofloxacin (CIP) at pH 5 and 8. Individual sorption and oxidation modelling were carried out using the first-order kinetic model. A coupled sorption-oxidation kinetic model was developed to predict the simultaneous sorption and oxidation process. The coupled sorption-oxidation enhanced the antibiotic sorption, with the first-order sorption rate constants in the simultaneous presence of clays and manganese oxides (k) being higher than those with clays only (k). In contrast, a depression was observed; the first-order oxidation and sorption combination rate constants in the simultaneous presence of manganese oxides and clays (k) were lower than those with manganese oxides only (k). In the coupled sorption-oxidation reaction, 13.5-62.5% of SDZ and CIP removal was attributed to the sorption. The SDZ and CIP species distributions at pH 5 affected the coupled sorption and oxidation systems more than those at pH 8. The best removal efficiency was achieved by the montmorillonite-synthesized MnO combination, mainly due to the higher surface area (A) and pore size of montmorillonite and synthesized MnO combination compared to other clays and manganese oxides combinations.
在 pH 值为 5 和 8 条件下，进行了抗生素磺胺嘧啶（SDZ）和环丙沙星（CIP）的去除实验，包括粘土（蒙脱石和高岭土）的吸附、氧化和锰氧化物（合成 MnO 和天然 MnO）的吸附，以及偶联吸附-氧化实验。采用一级动力学模型对单独的吸附和氧化过程进行了建模。开发了一种偶联吸附-氧化动力学模型来预测同时吸附和氧化过程。偶联吸附-氧化增强了抗生素的吸附，同时存在粘土和锰氧化物时的一级吸附速率常数（k）高于仅存在粘土时的速率常数（k）。相比之下，观察到了一种抑制作用；同时存在锰氧化物和粘土时的一级氧化和吸附组合速率常数（k）低于仅存在锰氧化物时的速率常数（k）。在偶联吸附-氧化反应中，SDZ 和 CIP 的 13.5-62.5%的去除归因于吸附。在 pH 值为 5 时，SDZ 和 CIP 的物质分布比在 pH 值为 8 时更能影响偶联吸附-氧化体系。蒙脱石-合成 MnO 组合的去除效率最高，主要是由于蒙脱石和合成 MnO 组合的比表面积（A）和孔径比其他粘土和锰氧化物组合更高。
