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1、生態(tài)與農(nóng)村環(huán)境學(xué)報2012,28(6):706-711JournalofEcologyandRuralEnvironment硅藻土基復(fù)合除磷劑的制備及其吸附性能①高耀文,段寧,吳克明,沈麗娟(武漢科技大學(xué)冶金礦產(chǎn)資源高效利用與造塊湖北省重點實驗室,湖北武漢430081)摘要:以硅藻土為原料,通過引入鋼渣復(fù)合的方法制備硅藻土基復(fù)合除磷劑,采用傅里葉變換紅外光譜(FTIR)、X-射線衍射(XRD)和掃描電鏡(SEM)對復(fù)合除磷劑進行表征,并研究投加濃度、吸附時間、pH值和溫度對復(fù)合除磷劑吸附效果的影響。結(jié)果表明
2、,與鋼渣復(fù)合后,復(fù)合除磷劑中部分基團可能發(fā)生變化,晶體結(jié)構(gòu)可能發(fā)生改變,-1出現(xiàn)新的晶相。靜態(tài)除磷試驗表明復(fù)合除磷劑的最佳反應(yīng)條件:投加質(zhì)量濃度2g·L,吸附時間1h,水樣pH值為5,溫度25℃。硅藻土基復(fù)合除磷劑對磷的吸附動力學(xué)行為符合準(zhǔn)二級動力學(xué)模型;Freundlich、Langmuir和Redlich-Peterson吸附等溫方程均能較好地描述復(fù)合除磷劑對磷的等溫吸附特征。硅藻土基復(fù)合除磷劑對磷的理-1論飽和吸附量為1428mg·kg,是一種潛在的高效環(huán)保型吸附材料。關(guān)鍵詞:復(fù)合除磷劑;硅藻土;鋼渣
3、;動力學(xué);吸附等溫線中圖分類號:X703文獻標(biāo)志碼:A文章編號:1673-4831(2012)06-0706-06PreparationandAdsorptionPerformanceofDiatomite-BasedCompositePhosphorusRemovalAgent.GAOYao-wen,DUANNing,WUKe-ming,SHENLi-juan(HubeiProvinceKeyLaboratoryofMetallurgyResourcesEfficientUtiliza-tionandAg
4、glomeration,WuhanUniversityofScienceandTechnology,Wuhan430081,China)Abstract:Diatomitewasusedasrawmaterialandpreparedintoadiatomite-basedcompositephosphorusremovalagentbycombiningitwithsomecombiningsteelslag.TheagentwascharacterizedwithFouriertransforminfr
5、aredspectroscopy(FTIR),X-raydiffraction(XRD)andscanningelectronmicrograph(SEM).Besides,effectsofdosageoftheagentused,durationoftheadsorption,pHvalueandtemperatureonperformanceoftheagentwereinvestigatedbybatchsorp-tionexperiments.Resultsshowthatcombinationw
6、ithsteelslaghasbroughtaboutsomechangesinsomeparssadsandincrystallinestructure,creatingnewcrystalphases.StaticP-removingexperimentsdemonstratethattheagentperformedthe-1bestwhentheagentwasappliedatarateof2g·L,intothewastewater,5inpHand25℃intemperature,for1hi
7、n-cubation.EvaluationoftheexperimentaldataintermsofadsorptionkineticsrevealsthatthePadsorptionkineticbehavioroftheagentwellfittedthepseudo-second-orderkineticmodel.Meanwhile,isothermalequations,suchasFreundlich,LangmuirandRedlich-Petersonisothermscanbeused
8、towelldescribetheadsorptionperformanceoftheagent.Thetheo--1reticalPsaturationadsorptioncapacityoftheagentis1428mg·kg,whichindicatesthatthediatomite-basedcompositephosphorusremovalagentcanbeusedasapotentiallye