Adsorption mechanism and kinetics of azo dye chemicals on oxide nanotubes: a case study using porous CeO2 nanotubes
Adsorption mechanism and kinetics of azo dye chemicals on oxide nanotubes: a case study using porous CeO2 nanotubes
复制标题
氧化物纳米管上偶氮染料化学品的吸附机制和动力学：使用多孔 CeO2 纳米管的案例研究
DOI：
10.1007/s11051-016-3497-8
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发表时间：
2016
影响因子：
2.5
通讯作者：
Jia Xinjian
中科院分区：
文献类型：
--
作者：
Wu Junshu;Wang Jinshu;Du Yucheng;Li Hongyi;Jia Xinjian
金属氧化物纳米管由于其易于分离的整体微米级形貌和提供足够的表面活性吸附位点的纳米级表面特性的协同作用，被认为是具有吸附功能的水净化的有前途的材料。采用模板法制备了均匀有序的多孔CeO 2纳米管，并研究了CeO 2纳米管对自然条件下抗氧化脱色的偶氮染料刚果红的吸附行为。傅里叶变换红外光谱表明，刚果红通过磺酸根SO 3 −上Ce 4+阳离子的双齿桥连接以及氧空位产生的质子化表面与解离的磺酸根之间的静电引力成功地包覆在CeO 2纳米管表面。吸附动力学数据符合准二级动力学方程，而Langmuir等温方程表现出更好的相关性与实验数据。由等温模型计算的最大吸附容量为362.32 mg/g。此外，所制备的CeO 2纳米管具有良好的可回收性和可重复使用性，再生后可作为高效的刚果红吸附剂。这些优良的性能使CeO 2纳米管成为一种很有前途的染料去除材料。图示摘要CeO 2纳米管由结晶化的纳米粒子组成，对典型的偶氮染料刚果红具有良好的吸附性能。
Metal oxide nanotubes are believed to be promising materials with adsorption functionality for water purification due to their synergistic effect of the overall microscale morphology for easy separation and nanoscale surface characters providing enough surface active absorption sites. This work shows the synthesis of uniform hierarchical porous CeO2 nanotubes via nanowire-directed templating method and describes the adsorption behavior of CeO2 nanotubes for a typical azo dye Congo red which has resistance to oxidation and decoloration in natural conditions. Fourier transform infrared spectroscopy spectra provided the evidence that Congo red was successfully coated on the surface of CeO2 nanotubes by both bidentate-type bridge link of Ce4+ cations from sulfonate SO3− groups and the electrostatic attraction between the protonated surface generated by oxygen vacancies and dissociated sulfonate groups. The adsorption kinetic data fitted well to the pseudo-second-order kinetic equation, whereas the Langmuir isotherm equation exhibited better correlation with the experimental data. The calculated maximum adsorption capacity from the isothermal model was 362.32 mg/g. In addition, the prepared CeO2 nanotubes exhibited good recyclability and reusability as highly efficient adsorbents for Congo red removal after regeneration. These favorable performances enable the obtained CeO2 nanotubes to be promising materials for dye removal from aqueous solution.Graphical AbstractCeO2 nanotubes composed of crystallized nanoparticles exhibit well adsorption ability for a typical azo dye Congo red.