以十六烷基三甲基溴化铵(CTAB)为模板剂,采用水热法制备了介孔TiO_2,对制得的样品进行了XRD、TEM、N2吸附-解吸表征,并探究了不同吸附条件对样品吸附性能的影响.结果表明,所得样品为窄孔道分布,其比表面积为161.2m~2/g,最可几孔径为5.2nm;与非介孔TiO_2相比,介孔TiO_2对氟离子的吸附性能明显优越,其对氟离子的吸附速率符合Bangham吸附速率方程,吸附量随氟离子浓度的增大而增大,而且吸附符合Langmuir等温吸附方程,属于放热吸附.
Mesoporous TiO_2 was synthesized by hydrothermal method using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template, and was characterized by X-ray powder diffraction(XRD), N_2 adsorption-desorption,transmission electron-microscope(TEM). Effects of different adsorption conditions on the adsorption ability of the sample was discussed. The sample showed a narrow pore size, large special surface area of 161.2m~2/g and the distributing pore diameter of 5.2nm; compared to non-mesoporous TiO_2 and P25, the mesoporous TiO_2, whose adsorption rate is in line with the Bangham equation, exhibited larger adsorption capability, and the adsorption capacity increased with the increasing of the concentration of fluoride ion; the adsorption of fluoride ion on mesoporous TiO_2 which belongs to exothermic adsorption can be well depicted using Langmuir isotherms equation.
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