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1、第35卷第6期能源化工Vol_35No.62014年12月EnergyChemicalIndustryDec.2014鋅鋁水滑石的控制合成及吸附性能研究徐焱,李張成,王百年,于斌,張霄翔(1.合肥工業(yè)大學制藥工程系,安徽合肥230009;2.合肥工業(yè)大學化學工程學院,安徽合肥230009;3.中國石化揚子石油化工股份有限公司,江蘇南京210048)摘要:采用簡單的水熱法和均勻共沉淀法合成了不同形貌的鋅鋁水滑石(ZnA1.LDHs),通過XRD、SEM、N:吸附等對合成的試樣進行了表征;研究了甲基橙在ZnA1一LDHs上的吸附性能,考
2、察了酸堿度和溫度等對其吸附性能的影響。結(jié)果表明:采用水熱法,添加乙二醇可合成出海膽狀ZnA1一LDHs,添加乙醇可合成出花狀ZnA1一LDHs;采用均勻共沉淀法可合成出片狀ZnA1一LDHs。其中海膽狀ZnA1一LDHs的比表面積最高,達147.3m/g,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/L海膽狀ZnA1一LDHs對100mg/L甲基橙的吸附容量和去除率分別達368mg/g和73.65%,其吸附動力學和吸附等溫線分別符合準二級速率方程和Langmuir方程。關鍵詞:鋅鋁水滑石比表面積吸附甲基橙中圖
3、分類號:0614.31文獻標識碼:A文章編號:1006—7906(2014)06—0064—06ControlledsynthesisofZn-AIlayereddoublehydroxidesandstudyontheiradsorptioncapabilityXUYah,LIZhangCheng,WANGBaiNian,YUBin,ZHANGXiaoXiang(1.DepartmentofPharmaceuticalEngineering,HefeiUniversityofTechnology,Hefei230009,China
4、;2.SchoolofChemicalEngineering,HefeiUniversityofTechnology,Hefei230009,China;3.SINOPECYangziPetrochemicalCo.,Ltd.,Naijing210048,China)Abstract:Zn—A1layereddoublehydroxides(ZnA1一LDHs)aresynthesizedbyhydrothermalandhomogeneousCO—precipitationmethods,respectively.Theas·pr
5、eparedsamplesarecharacterizedbyX—raydiffraction(XRD),scanningelectronmicroscopy(SEM)andN2adsorption,respectively.Adsorptionpropertiesofmethylorange(MO)onZnA1一LDHsarestudiedtoinvestigatetheinfluencesofinitialsolutionpHandtemperature.Itisfoundthattheurchin—likeandflower—
6、likeZnA1一LDHscanbesynthesizedbyhydrothermalmethodwhenaddingglycolandethanol,respectively.ZnA1-LDHsnanosheetscanbesuccessfullypreparedbyhomogeneousCO—precipi—tationmethodusingureaasprecipitatingagent.Thespecificsurfaceareaofsampleurchin—likeZnA1-LDHsreachesupto147.3m。/g
7、.whichshowsexcellentadsorptionperformanceforMO.TheresultsofadsorptionexperimentsindicatethatthemaximumcapacityofMOatequilibrium(q)andpercentageofadsorptionwithafixedadsorbentdoseof0.2g/Lare368mg/gand73.65%,whenconcentra—tionofmethylorange,temperatureandpHare100mg/L,25a
8、nd3,respectively.Theadsorptionkineticandtheadsorptioniso—thermofMOontheurchin—likeZnA1一LDHscanbedescribedbytheLangmui