Controllable Fabrication of Mesoporous MgO with Various Morphologies and Their Absorption Performance for Toxic Pollutants in Water

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• 作者：Cuiling Gao ; Wenli Zhang ; Hongbian Li ; Leiming Lang ; Zheng Xu
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：October 1, 2008
• 年：2008
• 卷：8
• 期：10
• 页码：3785-3790
• 全文大小：373K
• 年卷期：v.8,no.10(October 1, 2008)
• ISSN：1528-7505

文摘

We have developed a method of controllable synthesis of MgO with various morphologies by adjusting the composition and phase structure of magnesium carbonate hydrate (MCH). The phase structure of the MCH varied from monoclinic Mg₅(CO₃)₄(OH)₂(H₂O)₄ to hexagonal MgCO₃ by changing the concentration of Mg²⁺ and HCO₃⁻; the corresponding morphology of the MCH ranges from nanoflakes and flowerlike microspheres composed of nanoflakes to layer-like rhombohedra and microspheres composed of rhombohedra. After annealing, four kinds of mesoporous cubic MgO micronano structures were obtained with their original morphologies. Because of the high specific surface area, MgO mesoporous nanoflakes and flowerlike microsphers exhibited excellent absorption performance for common toxic heavy metal ions and organic pollutants and are expected to be a potential absorbent in wastewater treatment.