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ID:52388960
大小:2.20 MB
页数:9页
时间:2020-03-27
《聚乙烯亚胺改性氧化石墨对水中Cr(Ⅵ)的吸附.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31卷第6期无机化学学报V01.31No.62015年6月CHINESEJ0URNALOFINORGANICCHEMISTRY1185.1193聚乙烯亚胺改性氧化石墨对水中Cr的吸附王家宏,1尹小龙1吉艳芬2f-陕西科技大学资源与环境学院。西安710021)(污染控制与资源化研究国家重点实验室,南京大学环境学院,南京210093)摘要:通过对石墨氧化、酯化,将聚乙烯亚胺耦合接枝到氧化石墨表面,制备聚乙烯亚胺改性氧化石~(PEI—GO)。通过肌R、XRD、TEM、RS和XPS等对合成材料进行表征,并研究了其对水中的C删吸附和脱附性能。表征结果表明,聚乙烯亚胺成功嫁接到氧化石墨上.
2、其氨基含量为4.36mmo卜g-i。PEI—GO对水中C删具有很好的吸附性能,吸附等温线符合Freundlich方程,吸附动力学可用拟二级动力学方程来描述。PEI—GO对水中cdv0的吸附随pH的升高而降低。阴离子的存在降低吸附剂对c删的吸附.不同阴离子的影响大小顺序为PO>S0N0>Cl一。XPS结果表明,PEI.GO对CrcvD的去除是吸附一化学还原耦合作用的结果经4次脱附再生循环.PEI.GO对Cr(VI)仍具有较高吸附量,表明该吸附剂再生性好,可循环使用。关键词:聚乙烯亚胺;改性氧化石墨;六价铬;吸附;脱附中图分类号:O614.611文献标识码:A文章编号:1001-48
3、61(2015)06—1185—09DoI:10.11862/CJIC.2015.160Cr(V0AdsorptiononPolyethyleneimineModifiedGraphiteOxideWANGJia-HongYINXiao—LongJIYan—FenfCollegeofResourceandEnvironment,ShannxiUniversityofScience&Technology,XiOdZ710021,China)~StateKeyLaboratoryofPollutionControlandResourceReuse,andSchooloftheEnvi
4、ronment,NanjingUniversity,Nanjing210093,China)Abstract:Polyethyleneiminemodifiedgraphiteoxide(PEI—GO)werepreparedbygraftingpolyethyleneiminefPEI1onthesurfaceofgraphiteafteroxidationandesterification.ThestructureandsurfacepropertiesofsynthesizedcompositeswerecharacterizedbyFourier—transformedi
5、nfraredspectroscopy(FTIR),X—raydiffraction(XRD),transmissionelectronmicroscope(TEM),Rramanspectroscopy(RS)andX-rayphotoelectronspectroscopyfXPS1analvsis,anditsadsorptionanddesorptioncapabilityforaqueousCr佃wasalsoconducted.Characterizationresuhsindicatedthatpolvethvleneiminehasbeensuccessfully
6、graftedonthesurfaceofgraphiteoxide.andthecontentoftheaminogroupsofPEI—GOis4.36mmol·g~.PEI—GOexhibitshighadsorptioncapacityforaqueousC.AdsorptionisothermofC删ontoPEI—GOcouldbedescribedbetterbyFreundlichmode1thanLangmuirmode1.Thepseudo.second.orderkineticsfollowedtheadsorptiondataverywel1.Adsorp
7、tionamountofCr(\7DontoPEI—GOdecreasedwithincreasingpH.ThepresenceofanionsinsolutionresultedinthesuppressedCadsorption,andtheeffectofdifferentanionswasintheorderofpo3一>so?一>NO3一>C1一.XPSanalysisindicatesthatadsorptioncoupledchemicalreductionmec
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