Synthesis of mesoporous silica materials (MCM-41) using silica fume as the silica source in a binary surfactant system assisted by post-hydrothermal treatment and its Pb²⁺ removal properties

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• 作者：Wenjie Zhu ; Di Wu ; Xitong Li ; Jie Yu ; Yang Zhou ; Yongming Luo and Wenhui Ma
• 刊名：The Canadian Journal of Chemical Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：95
• 期：1
• 页码：46-54
• 全文大小：1553K
• ISSN：1939-019X

文摘

Mesoporous silica materials (MCM-41) were successfully prepared by substituting silica fume for silicate in different surfactant systems. The effects of binary surfactant systems and post-hydrothermal treatment on the morphology and structural properties of MCM-41 were investigated based on X-ray diffraction (XRD), N₂ sorption/desorption, and transmission electron microscopy analyses (TEM). The results confirmed that polyethylene glycol (PEG-6000) is an effective additive template in a binary surfactant system for the synthesis of mesoporous silica materials. Meanwhile, the hydrothermal stability of the mesoporous silica materials can be improved by post-hydrothermal treatment and the optimal experimental parameters are a temperature of 140 °C and a treatment time of 48 h. The formation of high-quality MCM-41 is based on the balance between the ordered assembly of the inorganic anionic species and cationic surfactant, in accordance with the electrostatic interactions and hydrogen bonds between PEG-6000 and the inorganic species. Meanwhile, Pb(II) removal from aqueous solution has also been examined using MCM-41 as an adsorbent. The results of adsorption showed that the as-synthesized MCM-41 demonstrated a high capacity of Pb²⁺.