新型纳米CeO2催化类Fenton降解盐酸四环素
Degradation of tetracycline hydrochloride via a heterogeneous Fenton-like catalyzed by nano-CeO2
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摘要: 本研究分别以NaOH和NH3·H2O为矿化剂,Ce(NO3)3·6H2O为铈源,采用水热法成功制备两种新型纳米二氧化铈材料(CeO2-Na与CeO2-N).XRD、FESEM、Raman和EPR等表征手段以及非均相类Fenton降解盐酸四环素(TCH)性能分析结果表明,与CeO2-N相比,纳米CeO2-Na催化剂具有更大的比表面积和更高的表面氧空位浓度,其对TCH的催化性能也优于CeO2-N.在TCH初始浓度为100 mg·L-1,催化剂投加量为0.7 g·L-1和H2O2投加量为10 mmol·L-1的条件下,CeO2-Na/H2O2/TCH体系对TCH的去除率达86%,通过简单的热处理可以恢复催化剂的催化活性.TCH的降解机理研究表明,该非均相催化体系中起主要作用的是O2-·自由基.本研究为纳米氧化铈催化剂的制备及其非均相类Fenton的应用提供一定的技术和理论参考.Abstract: In this work, two kinds of novel cerium oxides nanomaterials (CeO2-Na and CeO2-N) were successfully prepared from Ce(NO3)3·6H2O via a hydrothermal method, by using NaOH and NH3·H2O as mineralizer, respectively. According to the results of the powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Raman spectra, electron paramagnetic resonance (EPR) spectra, and the catalytic degradation experiments of tetracycline hydrochloride (TCH), it was found that CeO2-Na catalyst possessed the larger specific surface areas and the higher concentration of surface oxygen vacancies than that of CeO2-N, which also exhibited excellent catalytic performance. The removal efficiency of TCH in the CeO2-Na/H2O2/TCH system was 86% under the reaction conditions of 100 mg·L-1 TCH, 0.7 g·L-1 catalyst, and 10 mmol·L-1 H2O2. The catalytic activity of the CeO2-Na could be recovered by a simple heat treatment. The degradation mechanism of TCH indicated that O2-·radicals were the dominant reactive species in this heterogeneous system. This work provided a technical and theoretical reference for the application of heterogeneous Fenton-like reactions over nanosized cerium oxides catalysts.
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Key words:
- Nano-CeO2 /
- mineralizer /
- heterogeneous Fenton-like /
- catalytic degradation /
- tetracycline hydrochloride
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