摘要
合成了水铁矿、磁铁矿、针铁矿、赤铁矿四种铁氧化物,研究了它们对氟的吸附量及其影响因素.结果表明,四种铁氧化物对F-的吸附量差异较大,由大到小的顺序为：水铁矿、磁铁矿、针铁矿、赤铁矿.Henry吸附等温式仅能描述针铁矿对氟的吸附;Freundlich吸附等温式能较好的描述四种铁氧化物对氟的吸附,其相关系数达极显著水平或显著水平;Langmuir吸附等温式能够很好的描述四种铁氧化物对氟的吸附,其相关系数均达极显著水平.pH值和温度可明显影响铁氧化物对氟吸附,在酸性条件下,随着pH升高吸附量下降;而在碱性条件下,随着pH升高吸附量缓慢上升;在中性附近时吸附能力最差.随着温度升高（25~45℃）,吸附量呈增加趋势.
The ferrihydrite,magnetite,goethite and hematite were synthesized and characterized using XRD,SEM,FT-IR,BET and PZC.Their fluoride adsorptive capacity and influencing factors were studied.The results indicated that the adsorption capacity of the four iron oxides varies greatly（ferrihydritemagnetite,goethitehematite）.The surface hydroxyl quantity,the superficial positive charge quantity and specific surface area of iron oxides are the key influence factors adsorbing F-.The H-type adsorption isotherms only can describe adsorption of goethite on the fluorine.The F-type adsorption isotherms can describe adsorption of the four iron oxides on the fluorine,and the correlation coefficients reach extremely remarkable or remarkable level.The L-type adsorption isotherms can describe adsorption of the four kinds of iron oxides on the fluorine very well,and the correlation coefficients reach the extremely remarkable level.The initial pH and the temperature obviously influence the adsorption ability of iron oxides on fluorine.Under acidic condition,adsorptive capacity would drop with the pH increasing,under alkalinity condition,adsorptive capacity would slowly increase with the pH increasing,adsorptive capacity is lowest at neutrality.In the temperature range（25~45℃）,the adsorptive capacity would increase with the temperature increasing,which shows the adsorption is a spontaneous and endoergic process.
出处
《湖北民族学院学报（自然科学版）》
CAS
2009年第3期248-253,共6页
Journal of Hubei Minzu University(Natural Science Edition)
基金
湖北省教育厅科研项目(B200729007)
湖北民族学院2007年度青年项目
关键词
铁氧化物
氟
吸附
吸附等温式
影响因素
iron-oxides
fluorine
adsorption
adsorption isotherm
influence factors
