Morphological synthesis of Prussian blue analogue Zn₃[Fe(CN)₆]₂⋅xH₂O micro-/nanocrystals and their excellent adsorption performance toward methylene blue

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• 作者：Shikui Wu^a ; ^b ; ^{shikuiwu@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Xiaoping Shen^a ; ^{xiaopingshen@163.com" class="auth_mail" title="E-mail the corresponding author} ; Hu Zhou^c ; Guoxing Zhu^a ; Rongyan Wang^b ; Zhenyuan Ji^a ; Kangmin Chen^a ; Chaojun Chen^b
• 关键词：Prussian blue analogue ; Micro-/nanocrystals ; Synthesis ; Organic dye ; Adsorption
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：464
• 期：Complete
• 页码：191-197
• 全文大小：2039 K

文摘

Prussian blue analogue Zn₃[Fe(CN)₆]₂⋅xH₂O (Zn-PBA) micro-/nanocrystals with well-defined spherical, cubic and polyhedral morphologies have been successfully synthesized by a simple room-temperature solution method. The morphologies and sizes of the micro-/nanocrystals can be easily tuned by HCl dosage and polymer additive. The as-prepared products are characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis and Brunauer Emmet Teller adsorption–desorption analysis. The possible formation mechanism for these Zn-PBA micro-/nanocrystals is then proposed. In addtion, adsorption performances of these micro-/nanocrystals toward organic dyes are systematically investigated. It is demonstrated that they exhibit strong adsorption selectivity to methylene blue (MB) with an extraordinary adsorption capacity as high as 1.016 g g⁻¹ due to the proper pore size and large specific surface area (643.2 m² g⁻¹) of the product as well as the strong electrostatic interaction between MB molecules and Zn-PBA particles. It is found that the morphology and size of the micro-/nanocrystals have an important effect on their adsorption performance. Moreover, the adsorbed MB dye can be well released in some organic solvents such as ethanol and trichloromethane. The facile morphology-controlled synthesis and excellent adsorption property afford the materials promising application in adsorption related fields.