Influence of Ti(IV) on the structure and properties of zinc hydroxychloride
Influence of Ti(IV) on the structure and properties of zinc hydroxychloride
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Ti(IV)对羟基氯化锌结构和性能的影响
DOI：
10.1016/j.corsci.2008.08.022
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
T. Ishikawa
中科院分区：
文献类型：
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作者：
Hidekazu Tanaka;Aya Futoyu;A. Fujioka;K. Kandori;T. Ishikawa
以含ticl4的zncl2水溶液时效法制备了碱式锌盐（BZS）之一的羟基氯化锌（Zn5(OH)8Cl2·H2O: ZHC）层状材料。Ti/(Ti + Zn)原子比（XTi）为0 ~ 0.10。XRD结果表明，随着XTi的增加，ZHC的衍射强度降低。在XTi=0处形成的ZHC为六方片状颗粒，尺寸约为4μm，厚度约为0.2μm。通过掺杂Ti（IV）减小颗粒大小，并且在XTi小于0.03处产生不规则颗粒。Ti含量随xti的增加而增加，Ti（IV）比Zn（II）更容易掺入产物中。漫反射UV-vis结果表明，在XTi≥0.01处的产物中的Ti（IV）是四面体配位，而在XTi≥0.03处的产物是四面体和八面体配位的混合物。这些事实证明Ti（IV）抑制了ZHC的形成和晶体生长。由n2吸附等温线估算的掺钛ZHC的比表面积随着xti_2的增大而增大，这是由于颗粒尺寸的减小。与n2的吸附相反，单位表面积的H2O单层吸附容量随着xti_2的增加而降低。这似乎表明ZHC的层状结构是通过Ti（IV）的掺入而被分解的，而ZHC的层状结构是H2O分子可以进入而n2分子不能进入的。同样，掺杂Ti（IV）也抑制了CO2on ZHC的吸附。
Layered material of zinc hydroxychloride (Zn5(OH)8Cl2·H2O: ZHC), which is one of the basic zinc salts (BZS), prepared from ZnO nano-particles aged with aqueous ZnCl2solutions containing TiCl4was examined by various means. The Ti/(Ti + Zn) atomic ratio (XTi) was ranged from 0 to 0.10. XRD results indicated that the diffraction intensity of ZHC was decreased with increasing XTi. The ZHC formed at XTi=0 is hexagonal plate particles with ca. 4μm in size and ca. 0.2μm in thickness. The particle size was reduced by doping Ti(IV) and the irregular particles were generated at XTi⩾0.03. The Ti content was increased with increasing XTiand Ti(IV) was more easily incorporated in the products than Zn(II). Diffuse reflection UV–vis results suggested that Ti(IV) in the products at XTi⩽0.01 is tetrahedral coordination and that at XTi⩾0.03 is a mixture of tetrahedral and octahedral ones. These facts prove that Ti(IV) inhibits the formation and crystal growth of ZHC. The specific surface area of Ti-doped ZHC estimated from N2adsorption isotherms was increased with increasing XTiowing to the decrease of particle size. Contrary to the N2adsorption, H2O monolayer adsorption capacity per unit surface area was reduced as XTiincreased. This seems that the layered structure of ZHC, which is accessible to H2O molecules but not to N2molecules, is disintegrated by incorporation of Ti(IV). Similarly, adsorption of CO2on ZHC was inhibited by doping Ti(IV).