期刊
CHEMICAL ENGINEERING JOURNAL
卷 381, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122717
关键词
Persulfate; Natural mineral; Tetracycline; Activation mechanism; Superoxide radical
资金
- National Natural Science Foundation of China [51508167, 51604099]
- Foundation of Henan Educational Committee of China [18A610001, 17A610007]
- State-level Project Cultivation Fund Supports Project of Henan Normal University of China [5101219170809]
Natural bornite (NBo), a kind of Fe-Cu bimetallic sulfide mineral, was selected as an efficient activator for persulfate (PS) to degrade a typical antibiotic, tetracycline (TC). The removal percentage of TC got up to 81.6% in 180 min in the NBo/PS system with a mineralization efficiency of 48.7%. Experiment results showed that the released Fe had played a more important role than Cu in the degradation process. Reductive sulfur in the NBo catalyst could enhance the regeneration of Fe2+ and thus improve the degradation efficiency of TC by activated PS. The results of radical-quenching and electron paramagnetic resonance tests demonstrated that the dominant reactive oxygen species responsible for TC degradation were center dot OH, SO4 center dot- and O-2(center dot-) in the NBo/PS system. The generated O-2(center dot-) was originated from dissolved oxygen rather than PS, but PS could accelerate the reduction process of O-2 to O-2(center dot-) by NBo. NBo dosage, PS concentration, initial solution pH and common inorganic anions (Cl- and H2PO4-) all had significant effects on TC removal. NBo was considerable stable in catalyzing PS for TC degradation. This work demonstrates an efficient and cost-effective catalyst towards PS for organic pollutant removal and provides new insight into the mechanism of heterogeneous activation of PS by Fe-Cu bimetallic sulfide.
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