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《锌铝水滑石的控制合成及吸附性能研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第6期能源化工Vol_35No.62014年12月EnergyChemicalIndustryDec.2014锌铝水滑石的控制合成及吸附性能研究徐焱,李张成,王百年,于斌,张霄翔(1.合肥工业大学制药工程系,安徽合肥230009;2.合肥工业大学化学工程学院,安徽合肥230009;3.中国石化扬子石油化工股份有限公司,江苏南京210048)摘要:采用简单的水热法和均匀共沉淀法合成了不同形貌的锌铝水滑石(ZnA1.LDHs),通过XRD、SEM、N:吸附等对合成的试样进行了表征;研究了甲基橙在ZnA1一LDHs上的吸附性能,考
2、察了酸碱度和温度等对其吸附性能的影响。结果表明:采用水热法,添加乙二醇可合成出海胆状ZnA1一LDHs,添加乙醇可合成出花状ZnA1一LDHs;采用均匀共沉淀法可合成出片状ZnA1一LDHs。其中海胆状ZnA1一LDHs的比表面积最高,达147.3m/g,对甲基橙具有优异的吸附性能。在25℃,初始pH=3的条件下,0.2g/L海胆状ZnA1一LDHs对100mg/L甲基橙的吸附容量和去除率分别达368mg/g和73.65%,其吸附动力学和吸附等温线分别符合准二级速率方程和Langmuir方程。关键词:锌铝水滑石比表面积吸附甲基橙中图
3、分类号:0614.31文献标识码:A文章编号: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
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