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Spinel MnFe2O4 Nanoparticles Activating Bicarbonate/Hydrogen Peroxide for the Degradation of Tetracycline: Revealing the Influence of Temperature and Raw Water and Developing Countermeasure
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DOI：10.1142/S1793292026500682.png)
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Abstract
En 中文
Bicarbonate/hydrogen peroxide (BHP) activation is expected to treat antibiotic wastewater effectively, but it has been rarely studied at different temperature and raw water conditions. Based on their MnFe bimetallic sites and photothermal property, spinel MnFe2O4 nanoparticles were investigated as catalysts to activate BHP for tetracycline treating in variable temperature and raw water environments. At 23 +/- 2 degrees C, impressive activity was observed on MnFe2O4 nanoparticles for BHP activation to achieve the degradation of tetracycline regardless of in distilled, municipal tap and natural lake water. Meanwhile, spinel MnFe2O4 nanoparticles had high durability to activate BHP for tetracycline degradation, no obvious activity attenuation was found in 10 cycles of reuse. The apparent activation energy of tetracycline degradation with MnFe2O4/BHP was found to be 38.73kJmol-1, having temperature dependent feature. Accordingly, the activity of MnFe2O4/BHP for tetracycline degradation was proportional to temperature, and MnFe2O4/BHP had low activity at 3 +/- 2 degrees C and 13 +/- 2 degrees C. Under simulated sunlight irradiation, the activity of MnFe2O4/BHP for tetracycline degradation at 3 +/- 2 degrees C and 13 +/- 2 degrees C can be obviously improved by means of the photothermal property of spinel MnFe2O4 nanoparticles to rise temperature. In a 15L of continuous reactor with intake solution rate range of 2.4Lh-1 to 9.6Lh-1, MnFe2O4/BHP showed good operational performance for tetracycline degradation in municipal tap water. Active species detections revealed that tetracycline degradation with MnFe2O4/BHP was co-initiated by & sdot;O-2, & sdot;OH and & sdot;CO-3 which are mainly produced from spinel MnFe2O4 activating BHP reactions.
Keywords:
MnFe2O4
bicarbonate/hydrogen peroxide
tetracycline degradation
temperature
photothermal
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1.1
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