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1、第35卷第5期化學工業(yè)與工程技術(shù)V01.35No.52014年l0月JournalofChemicalIndustry&Engineering0ct..2014鋅鋁水滑石微米球的合成及吸附性能研究楊???,李張成,薛兵,湯化偉,王百年(合肥工業(yè)大學化學工程學院,安徽合肥230009)摘要:采用多步法合成鋅鋁復(fù)合氧化物(LDO)與鋅鋁水滑石(LDHs),通過XRD、SEM、TEM、N吸附等對合成的試樣進行了表征;研究了甲基橙(MO)在LDO及LDHs上的吸附性能,考察了pH值和溫度對吸附性能的影響,并結(jié)合紅外光譜和XRD對吸附機理進行探討
2、。結(jié)果表明:所制備的LDO和LDHs呈空心球狀,直徑為3~5Ixm,分散性較好,LDO比表面積高達210.2m/g;LDO對甲基橙具有優(yōu)異的吸附性能,在25℃,初始pH=3的條件下,0.2g/LLDO對100mg/L甲基橙的吸附容量和去除率分別達497mg/g和99.4%,其吸附等溫線和吸附動力學分別符合Langmuir方程和準二級速率方程。關(guān)鍵詞:鋅鋁復(fù)合氧化物鋅鋁水滑石空心微米球吸附機理甲基橙中圖分類號:0614.31文獻標識碼:A文章編號:1006—7906(2014)05—0060—07Preparationofmicrosp
3、heresofZn-AIlayereddoublehydroxidesandstudyontheiradsorptioncapabilityYANGBaojun,LIZhangcheng,XUEBing,TANGHuawei,WANGBainian(SchoolofChemicalEngineering,HeiUniversityofTechnology,Hefei230009,China)Abstract:Zn—A1mixedoxide(LDO)andZn—A1layereddoublehydroxides(LDHs)aresynt
4、hesizedbymulti—stepmethod.Theas—preparedsamplesarecharacterizedbyX—raydiffraction(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmi—croscopy(TEM)andN2adsorption,respectively.Adsorptionpropertiesofmethylorange(MO)onLDOandLDHsarestudied.Theinfluencesofinitialsol
5、utionpHandtemperatureontheadsorptionofMOareinvestigated,andtheadsorptionmechanismisdiscussedincombinationwiththeresultsofIRandXRDexperiments.Itisfoundthattwosampleshaveahierarchicallyhollowsphere—likemor—phologywithadiameterof3-5txmandmonodisperse.Thespecificsurfacearea
6、sofsampleLDOreachesupto210.2m/g.TheresultsofadsorptionexperimentsindicatesthatthemaximumcapacityofMOatequilibrium(q)andpercentageofadsorptionwithafixedad—sorbentdoseof0.2g/Lsre497mg/gand99.4%,whenconcentrationofMO,temperatureandpHare100m#L,25℃and3,re—spectively.Theadsor
7、ptionisothermsandtheadsorptionkineticsofMOontheLDOcanbedescribedbytheLangmuirisothermandpseudo—secondorderkinetic,respectively.Keywords:Zn—AImixedoxide;Zn—A1layereddoublehydroxides;hollowmicrosphere;adsorption;mechanism;methylorange甲基橙是染料中含偶氮鍵、芳香環(huán)的復(fù)雜有機的吸附劑是實現(xiàn)染料廢水有效治理的關(guān)鍵
8、]。化合物,具有耐日曬、穩(wěn)定性強、抗氧化性好等特水滑石類插層材料是一種由帶正電荷的金屬氫點,在厭氧條件下甲基橙氮鏈會降解產(chǎn)生芳香胺類氧化物層板和帶負電荷的層間陰離子構(gòu)成的層狀雙化合物,這類物質(zhì)具有一定毒性和致癌性,極大地