Citation: ZHANG Xia, ZHAO Yan, ZHANG Cai-Bei, MENG Hao. Synthesis and Characterization of TiO2 Nano-crystalline with Different Morphologies by Low-temperature Hydrothermal Method[J]. Acta Physico-Chimica Sinica, 2007, 23(06): 856-860. doi: 10.3866/PKU.WHXB20070612
低温水热合成异形TiO2纳米晶及其表征
70 ℃下在钛酸四丁酯(TBOT)水热合成TiO2过程中, 加入油酸, 控制TiO2颗粒的生长方向, 无需热处理, 直接得到针状和纺锤形锐钛矿TiO2纳米晶. 应用透射电子显微镜、X 射线衍射仪对TiO2纳米晶进行了形貌观察和晶体结构的测定. 红外光谱分析表明, 油酸分子以静电作用吸附于针状TiO2纳米晶的表面. 根据UV-Vis吸收峰, 计算了TiO2纳米晶的禁带宽度. 纺锤形TiO2纳米晶具有较高的光催化活性, 60 min内催化降解了90%的罗丹明B.
English
Synthesis and Characterization of TiO2 Nano-crystalline with Different Morphologies by Low-temperature Hydrothermal Method
Oleic acid was used in low-temperature hydrothermal reaction of tetrabutyl titanate (TBOT) to control the growth direction of TiO2 particles. TiO2 nano-crystallines in the shapes of needle and spindle were synthesized. The morphology and structure of these TiO2 particles were confirmed by means of TEM and XRD. The FT-IR spectrum analysis proved that oleic acid molecule was absorbed onto the surface of TiO2 particles through electrostatic interaction. The band-gap energies of TiO2 nano-crystallines were calculated according to their UV-Vis spectra. In the photocatalytic reaction, the spindle TiO2 particles showed higher activity, and 90% rhodanmine B was degraded in 60 min.
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