Macroporous ZnO Foams by High Internal Phase Emulsion Technique: Synthesis and Catalytic Activity

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• 作者：Sebastijan Kova膷i膷 ; Alojz An啪lovar ; Bo拧tjan Erjavec ; Gregor Kapun ; Nadejda B. Matsko ; Majda 沤igon ; Ema 沤agar ; Albin Pintar ; Christian Slugovc
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：6
• 期：21
• 页码：19075-19081
• 全文大小：458K
• ISSN：1944-8252

文摘

Zinc(II) oxide nanoparticles were used for the stabilization of dicyclopentadiene (DCPD)鈥搘ater-based high internal phase emulsions (HIPEs), which were subsequently cured using ring-opening metathesis polymerization (ROMP). The morphology of the resulting ZnO-pDCPD nanocomposite foams was investigated in correlation to the nanoparticle loading and nanoparticle surface chemistry. While hydrophilic ZnO nanoparticles were found to be unsuitable for stabilizing the HIPE, oleic acid coated, yet hydrophobic ZnO nanoparticles were effective HIPE stabilizers, yielding polymer foams with ZnO nanoparticles located predominately at their surface. These inorganic/organic hybrid foam-materials were subsequently calcined at 550 掳C for 15 min to obtain inorganic macroporous ZnO foams with a morphology reminiscent to the original hybrid foam, and a specific surface area of 1.5 m² g^鈥?. Longer calcination time (550 掳C, 15 h) resulted in a sea urchin like morphology of the ZnO foams, characterized by higher specific surface area of 5.5 m² g^鈥?. The latter foam type showed an appealing catalytic performance in the catalytic wet air oxidation (CWAO) process for the destruction of bisphenol A.

Keywords:

zinc(II) oxide; nanocomposites; polyHIPEs; ROMP; dicyclopentadiene; catalytic wet air oxidation