pH值对聚合钛离子/蒙脱石复合结构及其TiO_2纳米粒子的影响研究
Effects of pH Value on Composite Structure of Poly-titanium-ion/Montmorillonite and Its TiO_2 Nano-particle
查看参考文献14篇
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文摘
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采用水解-插层复合法,以TiOSO_4·2H_2O为TiO_2的前驱体,蒙脱石为复合基体,通过控制蒙脱石悬浊液pH值,制备了不同的蒙脱石复合结构样品.采用XRD研究了样品的结构、物相、晶粒大小等属性的变化.结果表明,蒙脱石悬浊液的pH值对TiOSO_4·2H_2O水解属性有较大的影响,从而影响水合氧化钛/蒙脱石的复合结构特性,当蒙脱石悬浊液pH为0.5时,电价较低且聚合度较小的聚合钛离子易于进入蒙脱石层间域,对蒙脱石结构层的分散剥离作用最好;经700℃热处理的TiO_2/蒙脱石复合结构样品中,锐钛矿晶粒尺寸最小达到13.4 nm;经1100℃热处理后,复合结构中锐钛矿相对含量达到35%;与纯纳米TiO_2样品相比,TiO_2/蒙脱石复合结构中的TiO_2具有更高的锐钛矿相向金红石相转变的温度及更小的晶粒尺寸.蒙脱石结构层对TiO_2的相转变和晶粒长大都具有明显的阻滞作用. |
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其他语种文摘
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The montmorillonite composite structure samples were prepared using a hydrolysation-intercalation composite method with TiOSO_4·2H_2O as a precursor of TiO_2 nano-particles and montmorillonite as substrate by controlling the pH value of the montmorillonite suspension. The changes of the structure, phase and crystal size of the samples were characterized by X-ray diffraction method. The results show that the pH value of montmorillonite suspension has a significant influence on the hydrolyzation of TiOSO_4·2H_2O, so the composite structure of hydrated- titanium-oxide/montmorillonite is affected. When the pH value of montmorillonite suspension is 0.5, the poly-titanium-ions are with the lower electrovalence and extent of polymerization and easily intercalate the interlayer space of montmorillonite, moreover, the structural layers of montmorillonite are separated best. The crystal size of anatase in the TiO_2/montmorillonite composite samples calcinated at 700℃ is smallest and reaches 13.4 nm. After calcination at 1100℃, the relative content of anatase in the composite structure reaches 35%. Compared with pure TiO_2 nano-particle sample, TiO_2/Montmorillonite composite sample has a higher phase transition temperature from anatase phase to rutile phase and smaller crystal size of TiO_2. Montmorillonite structure layer has a significant blocking effect on the TiO_2 phase transformation and grain growth. |
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来源
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无机材料学报
,2012,27(12):1294-1300 【核心库】
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DOI
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10.3724/sp.j.1077.2012.12087
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关键词
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聚合钛离子
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蒙脱石
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锐钛矿
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复合结构
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地址
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1.
西南科技大学矿物材料及应用研究所, 绵阳, 621010
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广州, 510460
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语种
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中文 |
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ISSN
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1000-324X |
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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
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中国科学院矿物学和成矿学重点实验室开放基金
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文献收藏号
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CSCD:4704811
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