论文部分内容阅读
采用水热法,以硝酸镍为镍源,利用商业二氧化钛(P25)制备Ni2+掺杂钛纳米管。对样品进行扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)和比表面积仪(BET)的表征。结果表明:采用水热法生成了均匀的钛纳米管,管壁多层且两端开口;Ni2+掺杂基本没有改变钛纳米管的形态和晶型结构;掺杂5%Ni2+的钛纳米管的比表面积为233.89 m2/g,大于未掺杂的纳米管(187.52m2/g),远大于原料P25(45.6 m2/g)。以亚甲基蓝溶液为降解对象,研究Ni2+的掺杂量、pH值、振荡时间和温度对Ni2+掺杂钛纳米管吸附性能的影响。Ni2+的掺杂量、pH值、振荡时间和温度对Ni2+掺杂钛纳米管的吸附性能具有显著影响。用非线性回归分析对吸附等温线进行拟合,Langmuir吸附模型比Freundlich吸附模型拟合效果好。
Ni2 + doped titanium nanotubes were prepared by commercial hydrothermal method using nickel nitrate as nickel source and commercial titanium dioxide (P25). The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and specific surface area analyzer (BET). The results show that the uniform titanium nanotubes are produced by hydrothermal method, and the tube walls are multilayered and open at both ends. The morphology and crystal structure of titanium nanotubes are basically unchanged by Ni2 + doping. The nanotubes doped with 5% Ni2 + The specific surface area is 233.89 m2 / g, which is larger than that of undoped nanotubes (187.52 m2 / g), which is much larger than that of P25 (45.6 m2 / g). The effect of Ni2 + doping amount, pH value, oscillation time and temperature on the adsorption properties of Ni2 + -doped titanium nanotubes was studied with methylene blue solution as degradation target. Ni2 + doping amount, pH value, oscillation time and temperature have significant influence on the adsorption properties of Ni2 + -doped titanium nanotubes. Fitting the adsorption isotherms with non-linear regression analysis, the Langmuir adsorption model fits the Freundlich adsorption model well.