摘要
以十六烷基三甲基溴化铵（CTAB）为模板剂，用热分解法制备了介孔γ-Fe2O3，对制得的样品进行了XRD、磁性、N2吸附-脱附表征，结果表明，所得样品的结晶度与磁性随着模板剂用量的增加而减小，最大比表面积为149．8m2／g；介孔γ-Fe2O3对氟离子的吸附平衡时间为30min，二级动力学模型能够很好地拟合吸附动力学数据；溶液的pH为3时，介孔γ-Fe2O3对氟离子的吸附率最高，通过Langmuir方程计算得极限吸附量为9．7mg／g。
Mesoporous γ-Fe2O3 was synthesized by thermal decomposition method using cationic surfactant cetyhrimethy lammonium bromide （CTAB） as a template, and its adsorption abilities for fluoride ion were investigated. X-ray powder diffraction（XRD）, magnetic measurements, and N2 adsorption-desorption showed that the crystallinity and saturation mag- netization of the mesoporous γ-Fe2O3 decreased with the increasing of amounts of surfactant and its maximum specific surface area was determined to be 149.8m2/g. The adsorption for fluoride reaching equilibrium in 30rain and the adsorption kinetics fitted well with pseudo-second-order equation. The adsorbed percentage of fluoride ion reached the maximum when the solution pH=3; and, the maximum adsorption capacity was estimated to be 9.7mg/g by using Langmuir equation.
基金
国家自然科学基金项目（20861006},内蒙古自然科学基金项目（2009MS0806）
