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首页> 外文期刊>RSC Advances >Tailoring the photo-Fenton activity of spinel ferrites (MFe2O4) by incorporating different cations (M = Cu, Zn, Ni and Co) in the structure
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Tailoring the photo-Fenton activity of spinel ferrites (MFe2O4) by incorporating different cations (M = Cu, Zn, Ni and Co) in the structure

机译：通过在结构中加入不同的阳离子（M = Cu，Zn，Ni和Co）来定制尖晶石（MFE2O4）的光芬顿活动

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摘要

Magnetic bimetallic nanospinels (MFe2O4; M = Cu, Zn, Ni and Co) with sizes ranging between 15-30 nm were synthesized using a facile and viable sol-gel method. Fourier transform infrared spectral analysis of all the samples demonstrated the formation of M-O bond in the spinel structure. Structural exploration of all the nano materials using powder X-ray diffraction and high resolution transmission electron microscopy revealed the formation of a single phase cubic spinel structure. All the materials exhibited a magnetic temperament with high surface areas (92-151 m(2) g(-1)). Furthermore, the band gaps calculated from the diffuse reflectance spectra were quite narrow (1.26-2.08 eV) for all the samples, hence the ferrites could act as visible light driven photocatalysts. The prepared nanospinels are proposed to be promising heterogeneous photo-Fenton catalysts under visible light for the degradation of organic pollutants. The catalytic results revealed that the rate of reaction was significantly influenced by the cation in the spinel structure as the degradation order was observed to be CuFe2O4 (k = 0.286 min(-1)) > ZnFe2O4 (k = 0.267 min(-1)) > NiFe2O4 (k = 0.138 min(-1)) > CoFe2O4 (k = 0.078 min(-1)). The reaction conditions were optimized for all the ferrites as the photodegradation was influenced by the ferrite dosage (0.25-1.00 g L-1), pH (2-5) and the H2O2 concentration (4-27 mM). The experimental data disclosed that the ferrite activity was sensitive to sintering temperature. The materials displayed remarkable stability in the reaction as they could be magnetically separated using an external magnet and recycled for up to 4 consecutive cycles. There was no significant loss in activity of all the materials, demonstrating the excellent ability of the ferrites to remove organic pollutants from wastewater.
机译：磁性双金属nanospinels（MFe2O4; M =铜，锌，镍和钴）具有尺寸15-30纳米之间的范围内，使用的简便和可行的溶胶 - 凝胶法合成。傅立叶变换所有样品的红外光谱分析表明M-O键的在尖晶石结构的形成。使用粉末X射线衍射和高分辨率透射电子显微镜的所有纳米材料的结构勘探揭示的单相立方尖晶石结构的形成。所有的材料表现具有高表面积的一磁性气质（92-151米（2）克（-1））。此外，从漫反射光谱计算出的带隙都相当窄（1.26-2.08 eV）的所有样品，因此铁氧体可以作为可见光光催化剂驱动。将制备的nanospinels提议是有前途可见光下异构光芬顿催化剂的有机污染物的降解。催化结果表明，反应速率为观察到的降解为了CuFe2O4（K = 0.286分钟（-1））>铁酸锌（K = 0.267分钟（-1））中的溶液显著通过在尖晶石结构的阳离子的影响>镍铁（K = 0.138分钟（-1））>铁酸钴（K = 0.078分钟（-1））。反应条件为所有的铁氧体优化作为光降解是由铁素体剂量（0.25-1.00克L-1），pH值（2-5）和H 2 O 2浓度（4-27毫米）的影响。实验数据公开了铁素体活性是烧结温度是敏感的。的材料，因为它们可能使用外部磁体被磁性分离并再循环最多连续4个周期在所述反应显示显着的稳定性。有在所有的材料的活性没有损失显著，展示出铁氧体的优良能力以从污水中去除的有机污染物。

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  • 来源
    《RSC Advances》 |2015年第8期|共13页
  • 作者

    Sharma Rimi; Bansal S.; Singhal Sonal;

  • 作者单位

    Panjab Univ Dept Chem Chandigarh 160014 India;

    DST New Delhi India;

    Panjab Univ Dept Chem Chandigarh 160014 India;

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  • 正文语种 eng
  • 中图分类 化学;
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