化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (8) : 44-48.

新材料与新技术

镁掺杂SiO₂有机-无机杂化材料的制备及热稳定性

杨靖, 王治刚, 李波, 李红玑, 郭英明, 马嘉莹

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Preparation and thermal stability of magnesium-doped SiO₂ organic-inorganic hybrid material

Yang Jing, Wang Zhigang, Li Bo, Li Hongji, Guo Yingming, Ma Jiaying

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Received
2018-04-12
Issue Date	Revised Date
2019-09-04	2018-04-12

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摘要

以Mg(NO₃)₂·6H₂O为镁源,采用溶胶-凝胶法制备镁掺杂SiO₂有机-无机(Mg/M-SiO₂)杂化材料,应用X射线衍射(XRD)、红外光谱(FT-IR)、热重-微分热重(TG-DTG)、扫描电镜(SEM)和能谱分析(EDS)等技术对其进行测试表征,考察镁掺杂对甲基化改性SiO₂材料物理化学结构的影响,研究该样品在N₂气氛中的热稳定性。结果表明:随着焙烧温度的增加,该杂化材料中的Si—CH₃吸收峰逐渐减弱。400℃焙烧2h和焙烧4h的样品中Si—CH₃吸收峰强度变化不大。所形成的凝胶材料中镁元素以Mg(NO₃)₂·6H₂O的形式存在,其在300℃分解为 Mg₃(OH)₄(NO₃)₂,经400℃焙烧4h后可完全分解为MgO,此后保持良好的MgO形态。为了保持Mg/M-SiO₂材料中MgO的形态和疏水性,适宜的焙烧温度为400℃焙烧4h。

Abstract

Magnesium-doped SiO₂ (Mg/M-SiO₂) hybrid materials were prepared by sol-gel method using Mg(NO₃)₂·6H₂O as the magnesium source.The samples were characterized by X-ray diffraction (XRD),fourier transform infrared spectroscopy (FT-IR),thermogravimetry-differential thermogravimetry (TG-DTG),scanning electron microscope (SEM) and energy dispersive spectrum (EDS) analysis.The effect of magnesium doping on the physical and chemical structures of SiO₂ materials was discussed.The thermal stability of the sample in N₂ atmosphere was investigated.The results showed that,with the increase of calcination temperature,the absorption peak of Si—CH₃ in the hybrid material was weakened.The intensity of Si—CH₃ absorption peak in the samples calcined for 2h and 4h at 400℃ had little change.In the gel material,the magnesium element was present in the form of Mg(NO₃)₂·6H₂O,which can be decomposed into Mg₃(OH)₄(NO₃)₂ at 300℃ and can be completely decomposed into MgO after calcination at 400℃ for 4h,and then a good MgO morphology is maintained.In order to keep the hydrophobicity of Mg/M-SiO₂ membranes,the suitable calcination temperature should be 400℃ for 4h.

关键词

溶胶-凝胶法 / 镁掺杂 / 改性 / 热稳定性 / 杂化材料

Key words

sol-gel method / magnesium doping / modification / thermal stability / hybrid material

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镁掺杂SiO₂有机-无机杂化材料的制备及热稳定性[J]. 化工新型材料, 2019, 47(8): 44-48 DOI:

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