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,探究了样品对氟离子的吸附性能,并对样品进行了XRD、磁性、N2吸附-脱附表征.结果表明,所得样品的平均晶粒尺寸为28.7nm,比表面为119m2/g,最可几孔径为3.1nm,饱和磁化强度为28A.m2/kg;当溶液的pH=3时,介孔γ-Fe2O3对氟离子的吸附率最高,其最大吸附量为6.8mg/g,并且吸附符合Langmuir吸附理论;将吸附氟离子的样品用NaOH溶液脱附处理后,可多次重复利用.
Mesoporous γ-Fe2O3 was synthesized by thermal decomposition method using cationic surfactant cetyltrimethy 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 show the formation of mesoporous γ-Fe2O3 with an average crystalline size of 28.7 nm,a surface area of 119 m^2/g, an average pore size of 3.1 nm, and a saturation magnetization of 28 A·m^2/kg. The adsorption of fluoride ion fits well with Langmuir adsorption model; and the adsorbed percentage of fluoride ion reaches the maximum when the solution pH=3 ,with an adsorption capacity of 6.8 mg/g. The mesoporous γ-Fe2O3 adsorbent containing fluoride ion can be effectively regenerated by a chemical desorption method using NaOH solution.
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
2011年第6期600-604,609,共6页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(20861006)
内蒙古自然科学基金资助项目(2009MS0806)
关键词
介孔γ-Fe2O3
氟离子
吸附性能
热分解法
mesoporous γ-Fe2O3
fluoride
adsorption ability
thermal decomposition method
