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Rapid decomposition of Direct Blue 6 in neutral solution by Fe-B amorphous alloys

机译：用Fe-B非晶合金快速分解中性溶液中的中性溶液中的直接分解

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摘要

The development of environmental-friendly materials for the highly-efficient purification of dye-containing wastewater is important and attractive. In this work, Fe-B amorphous alloy ribbons were fabricated and employed to degrade the azo dye, Direct Blue 6. It shows that Fe-B binary amorphous alloys possess low reaction activation energy (25.43 kJ mol(-1)) and much higher degrading efficiency than their crystalline counterparts and the commercial iron powders. Under the same experimental conditions (25 degrees C, initial pH = 7), the surface area normalized reaction rate constant of Fe84B16 amorphous alloy is approximately 1.8 and 89 times as that of its crystalline alloy and the 300 mesh iron powders, respectively. It indicates that the homogeneous amorphous structure is beneficial to the degradation rate of the zero valent iron. It has been found that boron plays an important role in enhancing the degradation rate because it contributes to the formation of an incompact oxide layer at the metal-water interface. Unlike the dense oxide layer formed on the surface of iron powders, this incompact layer would benefit iron atoms' movement and promote the reduction of contaminants. The present results provide a new amorphous zero valent iron material and a new way of designing proper iron-based alloys for waste-water remediation.
机译：为含染料废水的高效净化的环保材料的开发是重要的和有吸引力的。在这项工作中，制造了Fe-B非晶合金丝带并用于降解偶氮染料，直接蓝6.表明Fe-B二元非晶合金具有低反应活化能量（25.43kJ摩尔（-1））和更高比其结晶对应物和商业铁粉的降解效率降低。在相同的实验条件下（25摄氏度，初始pH = 7），Fe84b16非晶合金的表面积归一化反应速率常数分别为其结晶合金和300目铁粉末的约1.8〜89倍。它表明均匀的无定形结构有利于零价铁的降解率。已经发现，硼在提高降解率方面发挥着重要作用，因为它有助于在金属 - 水界面处形成流化的氧化物层。与在铁粉表面上形成的致密氧化物层不同，这种浓度的层将有益于铁原子的运动并促进污染物的减少。目前的结果提供了一种新的无定形零价铁材料和设计适当的铁基合金的新方法，用于废水修复。

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  • 来源
    《RSC Advances》 |2015年第8期|共7页
  • 作者

    Tang Yao; Shao Yang; Chen Na; Yao Ke-Fu;

  • 作者单位

    Tsinghua Univ Sch Mat Sci &

    Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci &

    Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci &

    Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci &

    Engn Beijing 100084 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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