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聚多巴胺包覆Fe3O4纳米粒子异相芬顿催化降解亚甲基蓝 被引量:1

Polydopamine-coated Fe3O4 Nanoparticles as Heterogeneous Fenton Catalysts for Degradation of Methylene Blue
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摘要 采用共沉淀法制备了磁性Fe3O4纳米粒子(Fe3O4 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Fe3O4NPs表面,制备了PDA包覆Fe3O4纳米粒子(Fe3O4@PDA NPs)。通过TEM、XRD、FTIR、XPS对粒子的形貌、结构及组成进行了表征。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,对该催化剂的催化活性及稳定性进行了考察,探讨了催化反应的机理。结果表明:Fe3O4NPs作为催化剂时,MB 2 h脱除率为26%,而Fe3O4@PDA NPs作为催化剂时,30 min,MB的脱除率为99%。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Fe3O4NPs具有更强的催化活性。此外,Fe3O4@PDA NPs稳定性良好,可实现2次回收再利用,对活性降低的Fe3O4@PDA NPs用NaBH4处理后,仍具有催化降解MB反应的能力。 Magnetic Fe3O4 nanoparticles (NPs) were firstly prepared by coprecipitation method. Then, polydopamine was introduced on Fe3O4 NPs surface by in situ oxidative polymerization of dopamine (DA). Finally,the obtained PDA-coated Fe3O4NPs ( Fe3O4 @ PDA NPs) were used as heterogeneous Fenton catalysts for degradation of methylene blue (MB). The morphology, structure and composition of the prepared Fe3O4@ PDA NPs were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The catalytic activity and stability of the Fe3O4 @ PDA NPs were investigated and the possible catalytic mechanism was also discussed. The degradation efficiency of MB was only 26% in case of Fe3 O4 NPs as catalyst within 2 h, while that reached 99% within 30 rain for Fe3O4 @ PDA NPs. The results indicated that the phenol and qunione units on PDA could promote circulation between Fe3+ and Fe2+, which made Fe3O4 @ PDA NPs exhibit a higher catalytic activity than Fe3O4 NPs. Additionally,Fe3O4 @ PDA NPs showed an excellent stability, and it could be reused two times. Moreover, after treatment of the used Fe3O4 @ PDA NPs with NaBH4, the regenerated Fe3O4 @ PDA NPs still could be use for the cycle reaction.
作者 杜思南 罗阳 左芳 李欣华 刘东 DU Si-nan, LUO Yang,ZUO Fang , LI Xin-hua, LIU Dong (College of Chemistry and Environment Protection Engineering, Southwest University for Nationalities, Chengdu 610041, Sichuan, China)
出处 《精细化工》 CSCD 北大核心 2017年第6期676-681,共6页 Fine Chemicals
基金 国家自然科学基金资助项目(50903011,51273220) 四川科技资助项目(2014GZ0012) 西南民族大学研究生创新型科研项目(CX2015SZ055)
关键词 聚多巴胺 FE3O4 纳米 异相Fenton 催化氧化 水处理技术与环境保护 polydopamine Fe3 O4 nanoparticles heterogeneous fenton reaction catalytic oxidation water treatment technology and environmental protection
作者简介 杜思南(1991-),女,硕士生。 联系人:左芳,副教授,博士,电话:028-85522315,E-mail:polymerzf@swun.cn。
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