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1、南京林業(yè)大學(xué)碩士學(xué)位論文土壤中四環(huán)素與銅的吸附行為及其影響因素研究姓名:英德安申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):土壤學(xué)指導(dǎo)教師:陳金林20080601StudyofAdsorptionofTetracyclineandCopperinSoilsandImpactofFactorsonTheirAdsorptionABSTRACTTherehasbeenanincreaseconcentrationoftetracycline(TTC;H2L)an

2、dCuinsoilandtheyareposingmoreandmorecnVironmentalriskastheresultofdeVelopmentofagricultureandaccelerationofindustrializationandurbanizationOnthisbackground,adsorptionofTTCandCuinsoilsandsoilmineralsandimpactoffactorsonth

3、eiradsorptionwerestudiedbybatchexperimentsThemainresultsaresumm盯izedasfollowing:1)CuadsorptionintheRedsoil(RS),Wushansoil(WS)andkaoIiniteincreasedwiththeincreasingsolutionCuconcentrationAdsorptionquantityofCuintheWSwashi

4、gherthanthatintheRSTTCstronglyadsorbedintheRS,WS,attapulgiteandkaoliniteAdsorptionquantityofTTCintheRSwashigherthanthatintheWSandthesameasattapulgitera也erthanthatonthekaoliniteFreundlichequationsfittheadsorptionisothe咖so

5、fCu髓dTTCinthesoils蛐dmineralswell2)WhentheequilibriumsolutionpHwasbelow50,60and63fortheRS,WSandkaolinite,respectiVely,TTCenhancedCuadsorptionwhichcouldbeduetothestrongerafnnityofTTCCucomplex(CuH2Lz十a(chǎn)ndCuHL十)totheadsorptio

6、nsitesthanCu2itself’orduetomoreCuadsorbedviatheTTCbridgeWhilethesolutionpHwasaboVe70,74如d74fortheRS,WS,montmorilloniteandkaolinite,respectiVely,TTCsuppressedCuadsorption,whichisascribedthatCureactedwithdissolVedTTCtoform

7、nochargedcomplexes(CuL)thathadlowera艏nitytothenegatiVechargedsoilormineralssurfaceincomparisonwithCuzitself3)WhenthesolutionpHwasbelow47fortheRSand34fortheWS,CusuppressedtheadsorptionofTTCinthesoils,whichisascribedthatTT

8、Cexistsascationic,zwitterionicandpositiVechargedconlplexesofTTCandCuspeciesatlowpH,andCudecreasedtheadsorptionofTTCduetocompetitionf0rtheadsorptionsites;whilethesolutionpHwasaboVe47fortheRSand34fortheWS,theadsorptionquan

9、tityofTTCincreased,whichisascribedthatathighpH,thecomplexesofTTCandCuhaVefewernegatiVecharges,andhaVehigherafjfinitytothenegatiVechargedsoilsurfacesthanTTCitselfInaddition,theadsorptionofTTCcantakeplaceonthesiteswhereCuw

10、asadsorbed,andactasabridgebetweenso訂particlesandTTC4)TwentyhourwasenoughforadsorptionequilibriumofTTCintheRSandtheWSThepresenceofphosphateandsulphatedecreasedtheadsorptionofTTCinthesoilsbycompetitionoftheadsorptionsiteso

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