聚多巴胺包覆Fe3O4纳米粒子催化降解亚甲基蓝
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Degradation of Methylene Blue by Polydopamine-coated Fe3O4 nanoparticles
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    摘要:

    采用共沉淀法制备了磁性Fe3O4纳米粒子(NPs),通过多巴胺(DA)原位氧化聚合的方式,将聚多巴胺(PDA)引入到Fe3O4 NPs表面,制备PDA包覆Fe3O4纳米粒子(Fe3O4@PDA NPs)。通过TEM、XRD、FTIR、XPS对粒子的形貌结构进行表征。随后将其作为异相芬顿(Fenton)催化剂用于催化亚甲基蓝(MB)的氧化降解,考察了该催化剂的催化活性及其稳定性,并探讨了该催化反应的机理。当 H2O2浓度为0.6 M,催化剂用量为1.16 mg/mL,pH为7的条件下, Fe3O4 NPs作为催化剂时,反应2 h,MB(25 mg/L)仅降解了26%,而Fe3O4@PDA NPs作为催化剂,30 min内,MB的降解率提高到了99%。实验结果表明:具有酚醌单元的PDA可促进Fe3+与Fe2+间的循环,使得Fe3O4@PDA NPs较之Fe3O4 NPs具有更强的催化活性。此外,Fe3O4@PDA NPs具有稳定性良好,可实现3次回收再利用,对活性降低的Fe3O4@PDA NPs用NaBH4处理后,仍可以继续用于循环反应。

    Abstract:

    Magnetic Fe3O4 nanoparticles (NPs) were prepared by coprecipitation method. The Fe3O4@PDA nanoparticles (PDA@Fe3O4 NPs) were synthesized by in-situ polymerization of dopamine (DA) on Fe3O4 NPs surface, and then utilized as heterogeneous Fenton catalysts for degradation of methylene blue (MB). The morphology, structure and composition of the samples prepared were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectra and X-ray photoelectron spectroscopy (XPS). Moreover, the catalytic activity and stability of the Fe3O4@PDA NPs were investigated and the possible catalytic mechanism was also discussed. The conditions were 0.6 M of H2O2 concentration,1.16 mg/L of catalyst dosage, 7.0 of pH and 25 mg/L MB mass concentration. Under the above conditions,the degradation efficiency of MB were only 26% in case of Fe3O4 NPs as catalyst within 2 h, while Fe3O4@PDA NPs exhibit higher catalytic activity with 99% MB degradation efficiency after 30 min. The results suggest that the existence of PDA which has phenol and qunione units in Fe3O4@PDA NPs promoted the cycle of Fe3+ to Fe2+, which induced the higher catalytic activity compared with Fe3O4 NPs. Moreover, Fe3O4@PDA NPs, with an excellent stability, could be reused three times and continue to the cycle reaction after regeneration by reaction with NaBH4.

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左芳,杜思南,罗阳,李欣华,刘东.聚多巴胺包覆Fe3O4纳米粒子催化降解亚甲基蓝[J].精细化工,2017,34(6):

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  • 收稿日期:2016-11-04
  • 最后修改日期:2017-01-16
  • 录用日期:2017-02-17
  • 在线发布日期: 2017-05-04
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