Ni/Co水滑石活化过一硫酸盐高效降解四环素

Ni/Co Hydrotalcite Activated Peroxymonosulfate for Efficient Degradation of Tetracycline

本文采用了水热共沉淀法合成了Ni/Co水滑石,并将其用于活化过一硫酸盐(PMS)高效降解四环素(TC)。通过进行不同的反应体系、氧化剂用量、催化剂用量、PH值、共存阴离子、循环实验和自由基猝灭等实验来评估催化剂的催化能力。结果表明:在PMS添加量1.5 mmol/L、催化剂添加量为0.2 g/L、pH为7时,催化效果最好可达到97.1%。共存阴离子CO32−、SO42−、Cl−和H2PO4−对催化剂的催化效果影响不大,经过5次循环实验,TC的降解率仍能保持在80%以上。自由基猝灭实验表明,在反应过程中自由基途径和非自由基途径均存在,两种途径中起作用从大到小依次为1O2 >SO4⋅−>O2⋅−> ·OH。

This article synthesized Ni/Co hydrotalcite using hydrothermal co precipitation method and used it to activate peroxymonosulfate (PMS) for efficient degradation of tetracycline (TC). The catalytic ability of the catalyst was evaluated by conducting different reaction systems, oxidant dosage, catalyst dosage, pH, coexisting anions, cycling experiments, and free radical quenching experiments. The results indicate that when the PMS addition is 1.5 mmol/L, the catalyst addition is 0.2 g/L, and the pH is 7, the best catalytic effect can reach 97.1%. The coexisting anions CO32−、SO42−、Cl−和H2PO4− have little effect on the catalytic performance of the catalyst. After 5 cycles of experiments, the degradation rate of TC can still be maintained above 80%. The free radical quenching experiment shows that both the free radical pathway and the non-free radical pathway exist during the reaction process, and the two pathways play a role in descending order from large to small: 1O2 >SO4⋅−>O2⋅−> ·OH.