A simple technique for the facile synthesis of novel crystalline mesoporous ZrO₂-Al₂O₃ hierarchical nanostructures with high lead (II) ion absorption ability

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• 作者：Xike Tian ; Qiongyu Wu ; Kin Mun Wong ; Chao Yang ; Weiwei Wang ; Xiaoning Wu ; Yanxin Wang ; Suxin Zhang ; Yong Lei
• 关键词：Crystalline mesoporous ZrO2&ndash ; Al2O3 ; Hierarchical nanostructures ; Lead (II) ion removal
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：1 November, 2013
• 年：2013
• 卷：284
• 期：Complete
• 页码：412-418
• 全文大小：1801 K

文摘

In this study, a simple evaporation-induced self-assembly process for the facile synthesis of crystalline ZrO₂-Al₂O₃ hierarchical nanostructures was reported. The synthesized hierarchical nanostructures display a long ranged ordered mesoporous structure, and demonstrated excellent adsorption properties for Pb (II) ions removal due to its larger surface-to-volume ratio. Characterization by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller (BET) analysis reveal that the as-synthesized nanostructures possess large BET surface area (278 m² g^?1), relatively large pore size (12.99 nm) and high pore volume (0.925 cm³ g^?1). The Pb (II) ions adsorption processes conformed to the pseudo-second order kinetics and the Langmuir adsorption isotherm was suitable in describing the lead removal processes where the equilibrium time for the Pb (II) ions adsorption on the ZrO₂-Al₂O₃ nanostructures was 30 min. These crystalline mesoporous ZrO₂-Al₂O₃ hierarchical nanostructures possess a maximum adsorption capacity of 110.49 mg g^?1 for Pb (II) and hence are an attractive adsorbent for the removal of heavy metal ion from water. In addition, our synthesized ZrO₂-Al₂O₃ hierarchical nanostructures also display good reusability properties.