钴金属-有机骨架活化过硫酸钠降解废水中的盐酸土霉素

Cobalt metal-organic framework activated sodium persulfate for the oxytetracycline hydrochloride degradation in wastewater

采用新制备的钴金属-有机骨架(Co-MOF)和过硫酸钠(PS)分别作为催化剂和氧化剂,并通过Co-MOF活化PS降解废水中的盐酸土霉素,考察Co-MOF浓度、PS浓度、pH及温度对降解盐酸土霉素的影响。SEM、TEM、XRD及XPS等结果证明,Co-MOF成功地被合成。降解实验结果表明,与单独的Co-MOF、PS相比,Co-MOF/PS的降解性能有大幅度的提高。当pH=5、温度30℃、Co-MOF为200 mg·L^−1以及PS为2000 mg·L^−1时,5 min后对20 mg·L^−1盐酸土霉素的降解率最高达到97.1%。在催化剂的重复使用实验中,Co-MOF第4次运行对盐酸土霉素的降解率由97.1%(第1次)降低至82.1%,这表明Co-MOF材料可以重复利用降解盐酸土霉素。Co-MOF降解盐酸土霉素实验反应前后的XRD和XPS数据表明Co-MOF具备良好的稳定性。以上研究结果可为新型高效降解体系的开发及其在水环境污染控制领域的应用提供参考。

The newly prepared cobalt metal-organic framework(Co-MOF)and sodium persulfate(PS)were taken as catalyst and oxidant,respectively,and oxytetracycline hydrochloride in wastewater was degraded by Co-MOF activated PS,the effects of Co-MOF concentration,PS concentration,pH and temperature on the degradation were investigated.The results of SEM,TEM,XRD and XPS proved that Co-MOF was successfully synthesized.The degradation experiment results show that the degradation performance of Co-MOF/PS was greatly higher than Co-MOF and PS alone.At pH=5,30℃,Co-MOF dosage of 200 mg·L^−1 and PS dosage of 2000 mg·L^−1,the degradation rate of 20 mg·L^−1 oxytetracycline hydrochloride reached 97.1%after 5 min.In the repeated use experiment of the catalyst,the degradation rate of oxytetracycline hydrochloride in the 4th run of Co-MOF decreased from 97.1%(in the 1st run)to 82.1%,which shows that the Co-MOF material could be reused to degrade oxytetracycline hydrochloride.The XRD and XPS data before and after the oxytetracycline hydrochloride degradation reaction with Co-MOF showed its good stability.This study can provide a reference for the development of new and high efficient degradation systems and their application in the field of water pollution.