碳化合成纳米SiO_2颗粒比表面积的控制机理
Controlling Mechanism of Specific Surface Area of Silica Nanoparticles in Carbonation Process
查看参考文献21篇
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文摘
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以Na_2SiO_3为前驱物, 研究了碳化合成纳米SiO_2颗粒比表面积的控制机理.正交实验结果表明, 影响其比表面积的次序为Na_2SiO_3浓度>PEG6000添加量>反应温度>CO_2/N_2混合气流量.当反应温度80℃、Na_2SiO_3浓度40 g/L、 PEG6000 4 g/L、CO_2/N_2混合气流量1.2 L/min时, 所制SiO_2颗粒的比表面积为318.9 m~2/g.随Na_2SiO_3浓度增大, SiO_2胶粒在pH>7的碳化液中Ostwald凝聚生长过程相对延长, 颗粒的一次粒径增大, 比表面积却随之减小.由于温度对 SiO_2溶解度和胶粒Brownian运动的影响, 降低反应温度可促进SiO_2成核、减少Si(OH)_4和≡SiOSi(OH)_3的聚合, SiO_2颗粒的比表积增大.添加剂PEG6000的空间架构效应抑制纳米SiO_2颗粒团聚, 从而促进SiO_2颗粒比表面积增大; 但当其浓度大于7 g/L时, Na_2SiO_3分子进入缠绕着的PEG长链架构内部, 所得SiO_2颗粒比表面积有所降低 |
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其他语种文摘
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Using sodium silicate as precursor, the controlling mechanism of specific surface area(S_(BET)) of silica nanoparticles synthesized by carbonation process was investigated. The results of orthogonal experiments demonstrated that the order of factors affecting S_(BET) was:sodium silicate concentration>added mass of PEG6000>reactive temperature>flow rate of CO_2/N_2 mixed gas. Under the optimal conditions of concentration of sodium silicate at 40 g/L, added mass of PEG6000 4 g/L, reactive temperature 80℃, and flow rate of CO_2/N_2 mixed gas 1.2 L/min, silica nanoparticles synthesized exhibited a high S_(BET) of 318.9 m~2/g. With the increase of concentration of sodium silicate, the size of primary particles increased, but SBET of silica particles decreased due to extension of Ostwald ripening process of SiO_2 sol in the carbonation solution where pH>7.Due to the effect of temperature on the solubility and Brownian motion of SiO_2 sol, the decrease of reaction temperature could accelerate the nucleation of silica and restrain the agglomeration of Si(OH)_4 and ≡SiOSi(OH)_3, therefore the S_(BET) increased. The increase of S_(BET) was facilitated by PEG6000 due to its steric hinderance effect. However, when PEG6000 in solution exceeded to 7 g/L, the precursor molecules entered into the PEG with tangled long chain, the S_(BET) of synthesized silica nanoparticles would be decreased |
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来源
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过程工程学报
,2010,10(4):795-801 【核心库】
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关键词
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碳化反应
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SiO_2纳米颗粒
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比表面积
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控制机理
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地址
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1.
北京科技大学, 生态与循环冶金教育部重点实验室, 北京, 100083
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中国科学院过程工程研究所, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-606X |
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学科
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化学工业 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:3973022
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