Department of Environmental Science and Engineering, Hubei Provincial Engineering Research Center of Systematic Water Pollution Control, China University of Geosciences, Wuhan 430074, China.
Department of Environmental Science and Engineering, Hubei Provincial Engineering Research Center of Systematic Water Pollution Control, China University of Geosciences, Wuhan 430074, China.
J Hazard Mater. 2020 Mar 5;385:121519. doi: 10.1016/j.jhazmat.2019.121519. Epub 2019 Oct 31.
A potential advanced oxidation process is provided by SBA-15 supported cobalt (Co/SBA-15) activated peroxymonosulfate (PMS, HSO) in the ultrasound (US) enhanced system, named Co/SBA-15/PMS/US process, for the elimination of refractory organic contaminants (ROCs) in water. This process exhibited favorable behavior with 95.5 % C.I. Acid Orange 7 (AO7) degradation using 5 mM PMS, 0.5 g/L Co/SBA-15 catalyst, 190 W US power at initial pH of 6.0 after 90 min reaction. Co/SBA-15 particles remained satisfied catalytic activity and stability with very low level of cobalt release in 10 successive cycles. The scavenge tests and electron paramagnetic resonance (EPR) result as well as the cobalt leaching concentration revealed that the reactive radicals (SO and OH) on catalyst surface were primarily responsible for AO7 oxidation, and a rational mechanism was elucidated accordingly. The presence of chloride ions and bicarbonate could improve AO7 removal. The probable pathway of AO7 degradation was proposed based on the intermediates identified. This Co/SBA-15/PMS/US process could be well applied for the destruction of other typical ROCs (bisphenol A, clofibric acid, and rhodamine B) and the treatment of lake and river water spiked with AO7, and this study may provide an efficient PMS technique for the remediation of ROCs in water.
超声辅助过一硫酸盐（PMS，HSO）活化负载钴的 SBA-15（Co/SBA-15）的潜在高级氧化过程可用于水中难降解有机污染物（ROCs）的去除，该过程被命名为 Co/SBA-15/PMS/US 工艺。在初始 pH 值为 6.0、反应 90 min 的条件下，使用 5 mM PMS、0.5 g/L Co/SBA-15 催化剂和 190 W 超声功率，该工艺对 95.5%的 C.I.酸性橙 7（AO7）的去除率表现出良好的效果。在 10 次连续循环中，Co/SBA-15 颗粒的催化活性和稳定性保持不变，钴的释放水平非常低。清除试验、电子顺磁共振（EPR）结果以及钴浸出浓度表明，催化剂表面的活性自由基（SO 和 OH）是 AO7 氧化的主要原因，并据此提出了合理的机理。氯离子和碳酸氢根的存在可以提高 AO7 的去除率。基于鉴定的中间产物，提出了 AO7 降解的可能途径。该 Co/SBA-15/PMS/US 工艺可很好地应用于其他典型 ROCs（双酚 A、氯菊酸和罗丹明 B）的破坏以及含有 AO7 的湖泊和河水的处理，本研究可为水中 ROCs 的修复提供一种有效的 PMS 技术。
