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题名	聚合物调控二氧化钛柱撑蒙脱石及对有机污染物的光催化降解作用研究
作者	王晨静
学位类别	硕士
答辩日期	2007-06-11
授予单位	中国科学院过程工程研究所
授予地点	过程工程研究所
导师	刘会洲
关键词	聚合物 调控 二氧化钛 柱撑蒙脱石
其他题名	Preparation of TiO2 Pillared Montmorillonite Tailored by Polymer and its Photocatalytic Performance on Degradation of Organic Pollutant
学位专业	化学工艺
中文摘要	二氧化钛柱撑蒙脱石结合了TiO2的光催化性能和蒙脱石的良好吸附性能，作为新型环境光催化材料，其研究已成为国内外学者关注的热点之一。但在传统的钛基柱撑蒙脱石制备工艺中，二氧化钛的前驱体-水合钛离子凝胶颗粒太小，焙烧后难以得到锐钛矿型TiO2晶体，导致实际光催化活性降低。因此如何调节蒙脱石层间距，控制TiO2颗粒尺寸在一定范围内，使复合材料发挥更好的光催化活性，成为TiO2柱撑蒙脱石研究所面临的重要挑战。 本研究将端氨基化的长链聚合物PPO-D作为结构调节剂引入到TiO2柱撑蒙脱石的制备过程中，调控蒙脱石层间TiO2颗粒的大小和形貌，提高柱撑蒙脱石的比表面积，改善其孔结构，实现蒙脱石高吸附性和TiO2高催化活性的有机结合。最后将所制备的柱撑蒙脱石材料应用于水中甲基橙的吸附和光催化降解，考察其光催化性能。 采用优化的先无机柱撑后有机柱撑的分步合成法，制备了聚合物调控的TiO2柱撑蒙脱石。PPO-D加入量对TiO2柱撑蒙脱石的层间距有很大影响，当Ti/土比为15，加入的PPO-D的量与蒙脱石CEC的比例为1.6时，层间距最大可达到3.97nm，此时层间聚合物的插入量基本达到了饱和状态。 对柱撑蒙脱石的结构分析结果显示，相比于小分子量表面活性剂，长链聚合物结构调节剂不仅可以增大二氧化钛柱撑蒙脱石的层间距，提高柱撑蒙脱石中的二氧化钛含量，而且比表面积较短链表面活性剂调控的柱撑蒙脱石(170.41 m2/g)明显增大，最大达到241.52 m2/g，其孔道结构比单独二氧化钛柱撑蒙脱石也得到了明显改善。复合柱撑蒙脱石中无定形的二氧化钛前驱体经过高温焙烧后，基本都转化成了锐钛矿型二氧化钛颗粒，而没有转变成金红石型。 通过对水中甲基橙的吸附和光催化性能研究发现，聚合物的调控作用能提高TiO2柱撑蒙脱石的吸附能力，光催化效率也有所改善。焙烧对复合柱撑蒙脱石的吸附能力影响显著，且焙烧后吸附能力优于焙烧之前的柱撑材料。
英文摘要	As a novel environmental material, TiO2 pillared montmorillonite has been one hot research topic and attracted much domestic and international attention because of its combination of the photocatalytic activity of TiO2 and the high adsorption capacity of montmorillonite. However, in the traditional preparation method of TiO2 pillared montmorillonite, the precursor of TiO2 (titanium gel) is too small to be transformed into the anatase TiO2 crystals with appropriate size. So the photocatalytic activity is lowered. Therefore, how to regulate the interlayer spacing of montmorillonite and control the size of TiO2 crystals in an appropriate range becomes a challenge. In the present paper, a polymer (polyoxypropylenediamine, PPO-D-2000) was used as organic structure modifier for the synthesis of composite pillared montmorillonite. With the organic modifier, the size and morphology of TiO2 between montmorillonite interlayers can be controlled. The pore structure of montmorillonite was optimized. The specific area of TiO2 pillared montmorillonite was increased. This strategy can make the best of the combination of the photocatalytic activity of TiO2 and the high adsorption property of montmorillonite. The composite materials were applied into the photocatalytic degradation of methyl orange to test their catalytic activity. A two-step synthetic method was developed to prepare polymer-TiO2 pillared montmorillonite. The influence of PPO-D upon the interlayer spacing of TiO2 pillared montmorillonite was investigated. It was found that when the ratio of PPO-D and CEC of montmorillonite was 1.6 and the molar ratio of Ti/montmorillonite was 15, the interlayer spacing can reach to the maximum 3.97nm. The pillared polymer was almost saturated between the interlayer of montmorillonite. The structure analyses of pillared montmorillonite show that as compared to the low-molecular weight surfactant, long-chain polymer modifier can significantly expand the interlayer spacing and thus more TiO2 could be intercalated into montmorillonite. The specific area of polymer-TiO2 pillared montmorillonite rises to 241.52 m2/g, which is obviously higher than that of low-molecular weight surfactant pillared montmorillonite. The pore structure is also optimized markedly in comparison with the traditional TiO2 pillared montmorillonite. After calcination, the amorphous titanium precursor almost transform into anatase TiO2 without detectable rutile phase. The investigation on the photocatalytic degradation of methyl orange in aqueous solution show that the modulation of long-chain polymer not only increases the adsorption capacity but also improves the photocatalytic activity of TiO2 pillared montmorillonite. Calcination has significant influence on the adsorption properties of composite pillared montmorillonite.
语种	中文
公开日期	2013-09-13
页码	71
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/1144]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	王晨静. 聚合物调控二氧化钛柱撑蒙脱石及对有机污染物的光催化降解作用研究[D]. 过程工程研究所. 中国科学院过程工程研究所. 2007.

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