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Cobalt ferrite nanoparticles via a template-free hydrothermal route as an efficient nano-adsorbent for potential textile dye removal

机译：钴铁氧体纳米粒子通过无模板的水热途径作为高效的纳米吸附剂，用于潜在的纺织染料去除

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摘要

We have reported herein the preparation of a pure cobalt ferrite (CoFe2O4) nanostructure, as an efficient nano-adsorbent, via a template-free hydrothermal and post thermal conversion route. We prepared micro-spherical particles of a cobalt carbonate/iron carbonate (CoCO3/FeCO3) composite precursor using the hydrothermal reaction of cobalt sulfate, iron sulfate, ascorbic acid, and ammonium carbonate at 140 degrees C for 3 h. Various parameters influencing the hydrothermal reaction have been studied. Thermal decomposition of the carbonate composite precursors prepared using different Co2+ : Fe2+ molar ratios generated various impure products. However, the CoCO3/FeCO3 composite precursor synthesized employing a 0.4Co(2+) : 0.6Fe(2+) molar ratio produced a pure spinel CoFe2O4 nanostructure with an average crystallite size of 9.5-21.6 nm on calcination in the temperature range of 400-600 degrees C for 2 h. The products were identified using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), high resolution transmission electron microscopy (HR-TEM), nitrogen physical adsorption (BET), zeta potential and thermal analysis. The as-prepared spinel CoFe2O4 product showed a high adsorption capacity (91.7 mg g(-1)) toward Reactive Red 195 (RR195) dye in 20 min. The adsorption results fitted well the pseudo-second-order kinetics and could be well described by the Langmuir isotherm model. The RR195 dye adsorption was spontaneous, exothermic, and a physisorption process, implied from the calculated thermodynamic constants: Delta G(0) (from -0.022 to -0.711 kJ mol(-1)), and Delta H-0 (-7.55 kJ mol(-1)). It is concluded that the suggested CoFe2O4 nanostructure can be employed as an efficient nano-adsorbent for the removal of RR195 textile dye from aqueous solutions.
机译：我们在本文中报道，通过无模板的水热和后热转化途径制备纯钴铁氧体（COFE2O4）纳米结构作为有效的纳米吸附剂。我们使用钴硫酸盐，铁硫酸铁，抗坏血酸和碳酸铵的水热反应在140℃下制备碳酸盐钴/铁（Coco3 / FeCO 3）复合前体的微球颗粒。研究了影响水热反应的各种参数。使用不同CO 2 +：Fe2 +摩尔比制备的碳酸盐复合前体的热分解产生各种纯产品。然而，使用0.4CO（2+）：0.6Fe（2+）摩尔比合成的Coco3 / FECO3复合前体在400的温度范围内产生纯尖晶石COFE2O4纳米结构，平均微晶尺寸为9.5-21.6nm -600℃2小时。使用X射线衍射（XRD），场发射扫描电子显微镜（Fe-SEM），傅里叶变换红外光谱（FT-IR），高分辨率透射电子显微镜（HR-TEM），氮气物理吸附（BET ），Zeta电位和热分析。制备的尖晶石COFE2O4产物在20分钟内朝向反应性红色（RR195）染料的高吸附容量（91.7mg（-1））。吸附结果井井有伪二阶动力学，可以通过Langmuir等温模型进行很好的描述。 RR195染料吸附是自发的，放热和物理吸附过程，从计算出的热力学常数暗示：Delta G（0）（从-0.022至-0.711 kJ mol（-1））和delta h-0（-7.55 kJ mol（-1））。得出结论，建议的COFE2O4纳米结构可用作高效的纳米吸附剂，用于从水溶液中除去RR195纺织染料。

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  • 来源
    《RSC Advances》 |2016年第83期|共18页
  • 作者

    Nassar Mostafa Y.; Khatab Mai;

  • 作者单位

    Benha Univ Dept Chem Fac Sci Banha 13518 Egypt;

    Benha Univ Dept Chem Fac Sci Banha 13518 Egypt;

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  • 正文语种 eng
  • 中图分类 化学;
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