Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, Nankai University, Tianjin, 300350, China.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, Nankai University, Tianjin, 300350, China.
Chemosphere. 2020 Feb;240:124962. doi: 10.1016/j.chemosphere.2019.124962. Epub 2019 Sep 24.
Pre-magnetized Fe (Pre-Fe) was for the first time applied as heterogeneous catalyst to enhance the oxidation efficiency of electro-Fenton (EF) for the degradation of p-nitrophenol (PNP). The parameters including current, initial pH and pre-Fe dosage of Pre-Fe/EF process were optimized and compared with other two processes (conventional Fe/EF and electro-oxidation) to confirm its advantage. The rate constants of PNP removal were 1.40-3.82 folds of those by Fe/EF process under various experimental conditions. The application of pre-Fe as catalyst could extend the working pH range from 3.0 to neutral conditions for PNP removal and reduce the Fe dosage from 2 to 0.5 mM corresponding to Fe/EF, avoiding the second pollution of iron sludge. The superiority of Pre-Fe/EF process was also verified to improve the degradation and mineralization of other phenols and antibiotics. Furthermore, a possible pathway of PNP degradation was revealed by the identification of intermediates and organic acids, and the possible mechanism of pre-Fe efficiently enhanced the EF efficiency was proposed. This work demonstrated that such a novel heterogeneous EF process using pre-Fe catalyst was clean and promising for the degradation of refractory organic pollutants.
首次将预磁化的 Fe（Pre-Fe）用作非均相催化剂，以提高电芬顿（EF）氧化效率，从而降解对硝基苯酚（PNP）。优化了包括电流、初始 pH 值和 Pre-Fe/EF 工艺预-Fe 用量在内的参数，并与另外两个工艺（传统的 Fe/EF 和电氧化）进行了比较，以确认其优势。在各种实验条件下，PNP 去除的速率常数是 Fe/EF 工艺的 1.40-3.82 倍。在催化剂的应用下，预-Fe 可以将 PNP 去除的工作 pH 值范围从 3.0 扩展到中性条件，并将 Fe 用量从 2 减少到 0.5mM（对应于 Fe/EF），从而避免了铁污泥的二次污染。还验证了 Pre-Fe/EF 工艺的优越性，以提高其他酚类和抗生素的降解和矿化。此外，通过鉴定中间产物和有机酸，揭示了 PNP 降解的可能途径，并提出了预-Fe 有效提高 EF 效率的可能机制。这项工作表明，使用预-Fe 催化剂的这种新型非均相 EF 工艺清洁且有希望用于降解难处理的有机污染物。
