负载铁和铈的硅藻土活化过硫酸盐去除四环素。

Tetracycline Removal by Activating Persulfate with Diatomite Loading of Fe and Ce.

机构信息

School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China.

School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, Shenyang 110016, China.

出版信息

Molecules. 2020 Nov 25;25(23):5531. doi: 10.3390/molecules25235531.

Persulfate (PS)-based oxidation technology is efficient in removing refractory organics from water. A novel diatomite (DIA) support Fe and Ce composite (Fe-Ce/DIA) was prepared for activating persulfate to degrade tetracycline in water. The Fe and Ce were uniformly loaded on DIA, and the total pore size of Fe-Ce/DIA was 6.99 × 10 cm/g, and the average pore size was 12.06 nm. Fe-Ce/DIA presented a good catalytic activity and 80% tetracycline was removed under the persulfate system. The Fe-Ce/DIA also had photocatalytic activity, and the corresponding tetracycline removal efficiency was 86% under UV irradiation. Fe-Ce/DIA exhibited less iron dissolution rate compared with Fe-DIA. The tetracycline degradation rate was enhanced when the temperature increased. The optimal tetracycline removal efficiency was obtained when the conditions were of persulfate 10 mM, Fe-Ce/DIA dosage 0.02 g/L, and tetracycline concentration 50 mg/L. In addition, Fe-Ce/DIA showed a wide pH application and good reusability and stability.

过硫酸盐（PS）氧化技术在去除水中难降解有机物方面非常有效。本研究制备了一种新型的硅藻土（DIA）负载的铁和铈复合材料（Fe-Ce/DIA），用于活化过硫酸盐来降解水中的四环素。Fe 和 Ce 均匀地负载在 DIA 上，Fe-Ce/DIA 的总孔体积为 6.99×10 cm/g，平均孔径为 12.06nm。Fe-Ce/DIA 具有良好的催化活性，在过硫酸盐体系下，80%的四环素被去除。Fe-Ce/DIA 还具有光催化活性，在 UV 照射下，四环素的去除效率相应地达到 86%。与 Fe-DIA 相比，Fe-Ce/DIA 的铁溶解率较低。随着温度的升高，四环素的降解速率加快。当过硫酸盐为 10mM、Fe-Ce/DIA 用量为 0.02g/L、四环素浓度为 50mg/L 时，四环素的去除效率最佳。此外，Fe-Ce/DIA 具有较宽的 pH 应用范围、良好的可重复使用性和稳定性。