Defluoridation of groundwater by calcined Mg/Al layered double hydroxide  

作　　者：A.Elhalil S.Qourzal F.Z.Mahjoubi R.Elmoubarki M.Farnane H.Tounsadi M.Sadiq M.Abdennouri N.Barka 

机构地区：[1]Univ Hassan 1,Laboratoire des Sciences des Matéeriaux,des Milieux et de la Modélisation(LS3M),BP.145,25000 Khouribga,Morocco [2]Equipe de Matériaux,Photocatalyse et Environnement,Département de Chimie,Facultédes Sciences,UniversitéIbn Zohr,B.P.8106 CitéDakhla,Agadir,Morocco

出　　处：《Emerging Contaminants》2016年第1期42-48,共7页新兴污染物（英文）

摘　　要：The present study evaluated calcined Mg/Al layered double hydroxide(CLDH)availability for the removal of fluoride from local groundwaters.The Mg/Al layered double hydroxide(LDH)was synthesized by coprecipitation method and characterized by XRD,FT-IR and TGA-TDA analyses.Batch defluoridation experiments were performed under various conditions such as calcination,solution pH,contact time,temperature,material dosage and reuse.Experimental results indicate that fluoride removal strongly increased after calcination of the LDH up to 600℃.The maximum fluoride removal was obtained at solution pH of 6.85.Kinetics of fluoride removal followed the pseudo-second order kinetic model.The rise in solution temperature strongly enhances the removal efficiency.The adsorption mechanism involved surface adsorption,ion exchange interaction and original LDH structure reconstruction by rehydration of mixed metal oxides and concomitant intercalation of fluoride ions into the interlayer region.The optimum dosages required to meet the national standard for drinking water quality were found to be 0.29 and 0.8 g/L,respectively,for Bejaad and Settat goundwaters.A decrease in the fluoride uptake with increasing the number of regeneration cycles was observed.

关 键 词：Fluoride removal GROUNDWATER Layered double hydroxide Drinking water quality 

分 类 号：O64[理学—物理化学]