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陶瓷基Al~(3+)掺杂硅胶吸附剂材料的制备与性能
作者:方玉堂 梁向晖 范娟 丁静 杨建平 杨晓西 
单位:华南理工大学  华南理工大学化学系 华南理工大学  华南理工大学  华南理工大学  东莞理工学院化学系 广州 510640  广东东莞 523106 
关键词:铝掺杂硅胶  浸渍  吸附  耐热性能  机械强度 
分类号:TB39
出版年,卷(期):页码:2004,32(11):1341-1346
DOI:
摘要:
陶瓷纤维纸经水玻璃、铝盐及其它添加剂顺次浸渍得到新型陶瓷基Al3+掺杂硅胶吸附剂材料。探讨浸渍条件对材料吸附性能的影响;反应的优化条件为:水玻璃质量分数26.6%,铝盐质量分数为10%,反应温度60℃。由于铝替代硅进入硅胶网络,红外光谱显示Si—OH对称伸缩振动峰由968cm-1移至Si(Al)—OH的954cm-1;扫描电镜图表明Al3+掺杂硅胶能较好地分布在陶瓷纤维表面及其孔隙中;X射线能谱(EDS)揭示材料表面微区Al3+的存在与含量;多孔介质孔隙分析显示材料起吸附作用的主要为中孔。由于Al3+掺杂,新型材料的吸附性能、耐热性能及机械强度等均优于同等条件下反应生成的硅胶。
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The novel Al~(3+ )doped silica gel adsorptive materials with ceramic fiber matrix were prepared by sequential impregnation of aqueous solution of sodium silicate (Na_(2)SiO_(3)), aluminum salt and other additives. The effects of the impregnation conditions on adsorptive property of the novel materials were discussed systematically. The optimal conditions are 26.67% (in mass fraction, same as below) of Na_(2)SiO_(3), 10% of aluminum salt , 60 ℃ of reaction temperature. FTIR spectra show that the symmetric stretching vibration shifts from 968 cm~(-1) of Si-OH to 954 cm~(-1) of Si (Al)—OH due to the substitution insertion of aluminum into the silica gel framework (Al~(3+)doping). Scanning electron microscope (SEM) imagine displays that Al~(3+)doped silica gel is well scattered in surface and the voids of the ceramic fiber sheet. Energy distribution X-ray spectrometer (EDS) (analysis) reveals the Al~(3+ )existence and content in the adsorptive materials surface micro zone. Porous medium surface area analyzer shows that mesoporous is dominant for adsorption. Owing to the Al~(3+)doping, the humidity adsorbing capacity, thermal property , mechanical strength of the novel adsorptive materials are superior to that of silica gel.
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基金项目:
广州市科技攻关(B18160)资助项目。
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参考文献:
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