2种改性生物炭对水体硝态氮的吸附特性张文

2018343253－259JournalofEcologyandＲuralEnvironment2017－04－06YKJ201624201611276044X①[e-mail]10．11934/j．issn．1673－4831．2018．03．009．2J．2018343253－259．ZHANGWenLXin-tianHANＲuietal．EffectsofTwoKindsofModifiedBiocharAdsorbingNitrate-NinWaterJ．JournalofEcologyandＲuralEnvi-ronment2018343253－259．2①2111672TyphaangustifoliaPhragmitescommunisFeCl3。2IＲ、SEM2、、、pH2。2。FeCl3XP－FeFeCl3LW－Feqm15.5510.63mg·g－1。pHXP－FeLW－Fe。XP－FeLW－Fe。X524A1673－4831201803－0253－07EffectsofTwoKindsofModifiedBiocharAdsorbingNitrate-NinWater．ZHANGWenLXin-tianHANＲuiHUZhi-xinSchoolofEnvironmentalEngineeringNanjingInstituteofTechnologyNanjing211167ChinaAbstractTwokindsofFeCl3modifiedbiocharpreparedseparatelyoutofTyphaangustifoliaandPhragmitescommunistwoaquaticplantswereusedasadsorbentandpotassiumnitratesolutionwasasadsorbateinthisstudytosimulateremovalofnitrate-Nbybiocharandfurthertoanalyzeadsorptionkineticsandadsorptionisothermcharacteristicsofthetwomodi-fiedbiocharsandtheiroriginalsandexploreeffectsofbiocharapplicationrateadsorptiondurationandinitialconcentra-tionandpHoftheadsorbateonnitrate-NadsorptionbythetwobiocharswiththeaidofinfraredspectroscopyIＲscan-ningelectronmicroscopySEMandelementalassay．Ｒesultsshowedthatnitrate-Nadsorptionofthetwomodifiedbio-charsfittedthepseudo-secondaryadsorptionkinetics．ThemaximumadsorptioncapacityqmoftheFeCl3modifiedTyphaangustifoliabiocharXP-FeandFeCl3modifiedPhragmitescommunisbiocharLW-Fewas15.55and10.63mg·g－1respectively．ＲeducedpHoftheadsorbatefacilitatednitrate-NadsorptionbyXP-FeandLW-Fe．XP-FewashigherthanLW-Feinnitrate-Nadsorptioncapacity．Keywordsaquaticplantbiocharnitrate-Nmodificationadsorptioncharacteristics。、、、1－2。＜700℃、、、3。4。4－6。46HClTyphaangustifoliaPhragmitescommunis。。。·254·342、2、。11.1、、。TU－1901－、XMT－8000、SHZ－82、Tenson27、SEM－S4800、VarioMicroELEMENTAＲ。1.2TyphaangustifoliaPhragmitescommunis22016104～5。54500℃1h1mol·L－1HCl1h80℃0.15mm。1mol·L－1FeCl31hpH80℃。FeCl3XP、XP－FeFeCl3LW、LW－Fe。1.3Tenson27250～4000cm－16cm－1。SEM－S480015kV。VarioMicroC、H、N、SO。WW=m2/m1×100%。11W%m1gm2g。1.41.4.1100mL20mg·L－1KNO3250mL0.1g25℃、150r·min－12h0.45μm25mL4。1.4.2pH100mL20mg·L－1KNO3250mL0.05、0.10、0.15、0.20、0.30、0.40、0.50、0.60gFeCl3。250mL0.1g20mg·L－1KNO3100mL1mol·L－1NaOHHClpH1、3、5、7、9、1125℃、150r·min－12h4。1.4.3250mL0.1g100mL20mg·L－1KNO325℃、150r·min－110、30、40、60、120、240、600min0.45μm7。1.4.4250mL0.1g5、10、20、30、40、50、60mg·L－1KNO3100mL25℃、150r·min－12h7。22.1XP、XP－Fe、LWLW－Fe699.16、1111.34、1398.71、1457.12、1698.44、2341.91、2360.66、3133.77、3446.46cm－11。699.16cm－11111.34cm－1C—O—C8－91398.71cm－1—COOH10－1132·255·1698.44cm－1CO12－133133.773446.46cm－1C—H—OH2360.662341.91cm－1P—H14。FeCl3Fe3+—OH、—COOH、CO15。FeOH3FeCl3。2。。SEM。XPXP－FeFeCl3LWLW－FeFeCl3。1Fig.1Infraredspectraofthebiochars×200002SEMFig.2SEMimagesofmodifiedandunmodifiedTyphaangustifoliabiochars2.2、500℃1。、3·256·3416。2C、H、O、N、SC73.21%C56.60%2H1%N、S1%～7%5%～7%O19.03%30.24%。2O/C、H/CO+H/CLW＞XPO/C、H/CO+H/C17。12、Table1Yieldelementalcontentsandatomicratioofthetwokindsofbiochars/%wC/%wH/%wN/%wS/%wO/%O/CH/CO+H/C32.38±0.9373.210.021.516.2319.030.260.010.2626.69±1.2856.600.776.565.8330.240.530.140.552.32FeCl3FeCl323。NO3－18FeCl3Fe3+NO3－19。XPXP－FeFeCl3LWLW－FeFeCl3。P＜0.05。3Fig.3Nitrate-Nadsorptionsofmodifiedandnon-modifiedbiochars2.4XP－Fe、LW－Fe2XP－Fe4g·L－173%LW－Fe6g·L－143%LW－FeXP－Fe4。XP－FeLW－FeFeCl3。4Fig.4Effectofapplicationrateofmodifiedbiocharsonnitrate-Nremovalrate2.5LangergrenSvenska2。3。lgqe－qt=lgqe－k1t2.3032tqt=1qe2k2+tqe。32～3qtFeCl3tmg·g－1k1min－1k2g·mg－1·min－1qemg·g－1tmin。XP－Fe120minLW－Fe240minXP－FeLW－Fe5。232·257·2。XP－FeLW－FeFeCl3。5Fig.5Ｒelationshipbetweennitrate-Nadsorptionofthemodifiedbiocharsanddurationoftheadsorption2.6。25℃XP－FeLW－FeLangmuirFreundlich20。LangmuirFreundlich4～563。Langmuirceqe=ceqm+1Kqm4Freundlichlgqe=lgKF+1nlgce。54～5qemg·g－1cemg·L－1qmmg·g－1KLangmuirKFFreundlichn。XP－FeFreundlichＲ2Langmuir3XP－FeFreundlich。LW－FeLangmuir。2Table2Parametersofthekineticequationfornitrate-NadsorptionofmodifiedbiocharsＲ2qe/mg·g－1k1/min－1Ｒ2qe/mg·g－1k2/g·mg－1·min－10.37660.690.0020.99958.100.090.34410.540.0030.99916.440.10qek1k2。XP－FeLW－FeFeCl3。6LangmuirFreundlichFig.6LangmuirandFreundlichnitrate-Nadsorptionisothermsofthemodifiedbiochars325℃Table3Parametersofthenitrate-NisothermequationforthemodifiedbiocharsLangmuirFreundlichKqmＲ2KF1/nＲ20.0915.550.93983.930.280.94090.0610.630.94381.180.480.9389KLangmuirqmKFFreundlichn。·258·34XP－FeLW－Fe1/n0.2760、0.48460.1～0.5221。FreundlichXP－FeLW－Feqm15.5510.63mg·g－1。6HCl5.5614.67mg·g－1。42.671.29mg·g－1。2.7pHXP－Fe、LW－FepHpH911XP－FeLW－Fe86.43%67.51%7。XP－FeLW－FeFeCl3。7pHFig.7EffectofpHonadsorptionofnitrate-NbymodifiedbiocharsFeCl3FeCl322pHH+H+NO－3H+FeCl3。pH23。pHOH－NO3－。46。31FeCl32FeCl3。22。XP－FeFreundlichLW－FeLang-muir。3XP－FeLW－Fe15.5510.63mg·g－1。4pH2FeCl3FeCl3。5XP－FeLW－Fe。1JINGSＲLINYFLEEDYetal．NutrientＲemovalFromPollu-tedＲiverWaterbyUsingConstructedWetlandsJ．BioresourceTechnology2001762131－135．2VEＲHOEVENJTAＲHEIMEＲBYINCetal．ＲegionalandGlobalConcernsOverWetlandsandWaterQualityJ．TrendsinEcology＆Evolution200521296－103．3．J．201636103292－3296．WANGYue-yingLYi-zhong．EffectofAcidEluti