Synthesis of a novel heterogeneous fenton catalyst and promote the degradation of methylene blue by fast regeneration of Fe2+
Synthesis of a novel heterogeneous fenton catalyst and promote the degradation of methylene blue by fast regeneration of Fe2+
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新型多相芬顿催化剂的合成及Fe2+快速再生促进亚甲基蓝降解
DOI：
10.1016/j.colsurfa.2018.04.009
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发表时间：
2018-07-20
影响因子：
5.2
通讯作者：
Zhong, Hong
中科院分区：
文献类型：
--
作者：
Cao, Zhan-fang;Wen, Xin;Zhong, Hong
通过简单的一步水热法合成了一种新型多相催化剂（TEA/GO@Fe3O4）。令人惊讶的是，TEA/GO@Fe3O4 对亚甲基蓝（MB）表现出极快的分解速率。根据表征结果，TEA/GO@Fe3O4的优异性能可归因于以下因素：（1）GO的应用阻止了Fe3O4纳米粒子的团聚；（2）GO的离域电子和三乙醇胺及其氧化剂产物（TEA）的孤对电子促进了Fe-2（+）的再生；（3）TEA/GO@Fe3O4的负表面电荷以及Fe之间的配位。 S可以加速MB向催化剂表面的扩散速率，（4）所制备的材料具有超顺磁性，矫顽力和剩磁可以忽略不计，（5）Fe3O4纳米颗粒固定在GO表面并通过TEA进行功能化。最后，通过TEM、FTIR、XRD、XPS、Zeta电位和降解实验证明了上述假设。降解反应结束后，催化剂可通过外磁场快速分离。因此，TEA/GO@Fe3O4 是一种很有前景的 MB 降解催化剂。
A novel heterogeneous catalyst (TEA/GO@Fe3O4) was synthesized by simple one-step hydrothermal method. Surprisingly, TEA/GO@Fe3O4 showed an extremely fast decomposition rate for methylene blue (MB). According to the characterization results, the superior properties of the TEA/GO@Fe3O4 can be attributed to following factors: (1) the application of GO prevents the agglomeration of Fe3O4 nanoparticles, (2) the delocalized electrons of GO and the lone pair electrons of triethanolamine and its oxidant products (TEA) promoted the regeneration of Fe-2(+), (3) the negative surface charge of TEA/GO@Fe3O4 and the coordination between Fe and S can accelerate the diffusion rate of MB toward the surface of catalyst, (4) the prepared materials were superparamagnetic with a negligible coercivity and remanence, (5) the Fe3O4 nanoparticles were immobilized on the surface of GO and functionalized by the TEA. Finally, the presumption mentioned above was proved by TEM, FTIR, XRD, XPS, Zeta potential and the degradation experiments. After the degradation reaction, the catalyst can be quickly separated by external magnetic field. Therefore, the TEA/GO@Fe3O4 is a promising catalyst for the degradation of MB.