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时间:2020-03-26
《CMPO和TBP在离子液体中选择性萃取水溶液中铀酰离子的研究.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、物理化学学~E(WuliHuaxueXuebao)32ActaP.一Chim.Sin.2015,(Supp1.),32-38Mav[Article]doi:10.3866/PKU.WHXB2014Ac10www.whxb.pku.edu.caCMPO和TBP在离子液体中选择性萃取水溶液中铀酰离子的研究孙涛祥沈兴海陈庆德(北京大学化学与分子工程学院,放射化学与辐射化学重点学科实验室,北京分子科学国家实验室,北京100871)摘要:研究了以辛基(苯基).N,N--异丁基胺甲酰基甲基氧化膦(CMPO)~I]磷酸三丁i
2、~(TBP)在离子液体(ILs)中选择性萃取水溶液中的铀酰离子(UO;).离子液体为1.烷基.3.甲基咪唑双三氟甲基磺酰亚胺盐(CmimNTf2,n=2,4,6,8).水相硝酸浓度以及离子液体的取代基链长对UO;的分配比和萃取选择性均有影响.与TBP相比,CMPO在离子液体中对UO;具有更高的萃取分配比和更好的萃取选择性.对模拟废液(SLW)萃取发现,Zr',ReO;和Cs是主要的竞争离子.ReOi和Cs可被离子液体本身萃取,而Z则是被CMPO和TBP萃取而不被离子液体本身萃取.本研究工作表明,CMPO—ILs
3、体系在铀酰离子的选择性萃取分离中具有一定的应用前景.关键词:离子液体:萃取:分离:选择性:铀酰离子中图分类号:0645InvestigationofSelectiveExtractionofUO;fromAqueousSolutionbyCMPOandTBPinIonicLiquidsSUNTao-XiangSHENXing—HaiCHENQing—De(BeijingNationalLaboratoryfo,MolecularSciences,Radiochem~tryandRadiationChemistr
4、yKeyLaboratoryofFundamentalScience,CollegeofChemistryandMolecularEngineering,PekingUniversity,Beijing100871,PR.China)Abstract:TheselectiveextractionofUO;fromaqueoussolutioninthepresenceofothermetaIionsbyoctylphenyl-N,N-diisobutyIcarbamoylmethylphosphineoxide
5、(CMPO)andtri-n—butylphosphate(TBP)inionicliquids(ILs),namely1-alkyl-3一methylimidazoliumbis(trifluoromethylsulfony1)imides(CmimNTf2,n=2,4,6,8),werestudied.TheinfluencesofthenitricacidconcentrationandtheILalkyIchainlengthonthedistributionratioandselectivitywer
6、eexamined.ComparedwithTBPinC4mimNTf2,CMPOintheILsgavehigherdistributionratiosandbetterselectivities.Zr',ReO,andCswerethemaincompetingionsIntheseparationofUO;fromsimulatedliquidwaste(SLM)bytheCmimNTf2systems.ReOiandCswereextractedbythelLsthemselves.Zr4wasextr
7、actedbvCMPOorTBPintheILsbutnotbythelLsthemselves.ThisworkgivesfurtherInformationontheuseoflLs.andprovidesabasisformatchingextractantswithILsintheprocessingofspentnuclearfue1.KeyWords:Ionicliquid;Extraction;Separation;Selectivity;UO;1lntroductionvaporpressure
8、,solvatingproperties,andthermalstability.一Es—Roomtemperatureionicliquids(ILs)havebeenconsideredaspecially,theyhavebeenconsideredasnextgenerationdiluentsasalternativesolventsforsynthetic,catalyti
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