Preparation and Study of Catalytic Properties of Mo Doped FeS2 Heterogeneous Fenton Catalysts
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摘要: 为提高FeS2活化H2O2降解有机物的性能，本研究通过引入多价金属钼(Mo)制备得到Mo掺杂的FeS2催化剂(FeS2@Mo)，并用于催化降解水中双酚A (BPA). 通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)对样品形貌和结构组成等进行表征. 研究了H2O2浓度、FeS2@Mo投加量、初始pH等条件对BPA降解效果的影响. 结果表明：①Mo掺杂的FeS2呈现花瓣形球体，尺寸500~1 000 nm. ②在条件为5 mmol/L H2O2、100 mg/L FeS2@Mo、pH=3.5时降解效果最优，且在该条件下反应10 min时BPA的降解率可达99.1%. ③淬灭试验和电子顺磁共振(EPR)试验的结果表明，该体系中的活性物种包括羟基自由基(·OH)、单线态氧(1O2)和超氧自由基(·O2−)，其中·OH和1O2占据主导地位. ④Mo的掺杂有助于提高反应体系中Fe2+的比率，提高Fenton催化效率. 研究显示，Mo的掺杂成功地提高了FeS2的催化性能，可以高效地降解水中的BPA，具有潜在的应用前景.
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关键词:
- 水处理 /
- 非均相Fenton催化 /
- 双酚A /
- Mo掺杂 /
- FeS2
Abstract: In order to improve the performance of FeS2 to activate H2O2 to degrade organic pollutant, polyvalent molybdenum (Mo) was introduced into FeS2 to obtain Mo-doped FeS2 (FeS2@Mo) catalyst. It was used to degrade bisphenol A (BPA) in water. The morphology and structure of the FeS2@Mo samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The effects of H2O2 concentration, FeS2@Mo dosage, and initial pH on BPA degradation were studied. The results show that: (1) The Mo-doped FeS2 is in petal-shaped spheres with a size of 500-1000 nm. (2) The degradation effect is the best under the conditions of 5 mmol/L H2O2, 100 mg/L FeS2@Mo, and pH=3.5, and the degradation rate of BPA can reach 99.1% after 10 min reaction. (3) The results of quenching experiments and electron paramagnetic resonance (EPR) experiment showed that the active species in the system were hydroxyl radical (·OH), singlet oxygen (1O2) and superoxide radical (·O2−), and ·OH and 1O2 were dominance. (4) The doping of Mo helps to increase the ratio of Fe2+ and improve the catalytic efficiency of Fenton. The research shows that the doping of Mo successfully improves the catalytic performance of FeS2 and enhances the degradation efficiency of BPA in water, which has potential application prospects.-
Key words:
- water treatment /
- heterogeneous Fenton catalysis /
- bisphenol A /
- Mo-doped /
- FeS2
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图 5 不同催化体系下BPA的降解效果
注：试验条件为BPA初始浓度20 mg/L，催化剂用量100 mg/L，H2O2用量5 mmol/L，溶液初始pH 3.5.
Figure 5. The degradation of BPA in different catalytic systems
图 6 催化剂投加量对BPA降解效果的影响
Figure 6. The effects of catalyst dosage on the degradation of BPA
图 9 FeS2@Mo循环次数对BPA降解的影响
Figure 9. The effects of recycle times of FeS2@Mo on the degradation of BPA
图 12 淬灭试验和不同体系的EPR图谱
Figure 12. Quenching experiments and EPR spectra in different systems
图 13 不同体系中Fe2+/Fe3+随反应时间(t)的变化
Figure 13. The change of Fe2+/Fe3+ with reaction time (t) in different systems
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