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为探讨不同性质表面活性剂对材料结构的影响,以4种常用的表面活性剂为模板,在相同的条件下制备出性能各异的铝掺杂二氧化钛(Al-TiO2)粉体材料。并对材料的微结构和组成进行了表征与分析。结果表明,表面活性剂疏水基团所含碳原子数与Al-TiO2粉体的微晶尺寸呈负相关性,与晶格应力呈正相关性。表面活性剂诱导Al3+进入TiO2晶格的质量分数越大,晶格应力越大。Al-TiO2粉体材料的可见光降解吡啶的性能主要是由表面活性剂本身特定的分子结构及其所导致的氧空位浓度大小来决定,而不是能带间隙的宽窄来决定。阴离子表面活性剂对材料的微结构有很大的调控作用,其中SDS为最大;阳离子表面活性剂CTAB次之,两性表面活性剂对材料性能的调控没有优异表现。
In order to investigate the influence of surfactants of different nature on the structure of the materials, aluminum-doped titanium dioxide (Al-TiO2) powder materials with different properties were prepared under the same conditions using four kinds of commonly used surfactants as templates. The microstructure and composition of the material were characterized and analyzed. The results show that the number of carbon atoms in the hydrophobic groups of the surfactant is negatively correlated with the crystallite size of the Al-TiO2 powder and has a positive correlation with the lattice stress. Surfactant induced Al3 + into the TiO2 lattice mass fraction, the greater the lattice stress. Visible photodegradation of Al-TiO2 powder The performance of pyridine is mainly determined by the specific molecular structure of surfactant and the concentration of oxygen vacancy caused by it, not the width of bandgap. Anionic surfactants have a great effect on the microstructure of the materials, of which SDS is the largest; cationic surfactant CTAB is the second, and amphoteric surfactants do not have excellent performance on the material properties.