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1、第30卷第12期环境科学Vol.30,No.122009年12月Dec.,2009ENVIRONMENTALSCIENCE负载型纳米铁吸附剂去除饮用水中As()的研究1,21*1,21,21,2朱慧杰,贾永锋,姚淑华,吴星,王淑莹(1中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳110016;2中国科学院研究生院,北京100049)摘要:以活性炭为载体制备了一种负载型纳米铁吸附剂.纳米铁在活性炭孔内为针状,其直径为30~500nm,长度为1000~3000nm,载入量
2、[m(Fe)m(炭)]为821mgg.用15gL该吸附剂对pH65、(252)!、2mgL的As()进行吸附其去除率为995%,在平衡浓度10mgL时,该吸附剂对As()的吸附容量为154mgg;吸附速度较快,12h可达914%,72h达到吸附平3-2-衡.吸附过程可由孔内扩散模型较好地说明.除PO4、SiO4外其它常见阴阳离子均对As()的去除影响不大.吸附剂可以用01molLNaOH溶液再生,再生效率较高.实验室初步实验数据表明,该吸附剂对饮用水砷去除具有较好
3、的应用前景.关键词:负载型纳米铁;As();吸附;饮用水中图分类号:X52文献标识码:A文章编号:02503301(2009)12356206RemovalofArsenatefromDrinkingWaterbyActivatedCarbonSupportedNanoZeroValentIron1,211,21,21,2ZHUHuijie,JIAYongfeng,YAOShuhua,WUXing,WANGShuying(1KeyLaboratoryofTerrestrial
4、EcologicalProcess,InstituteofAppliedEcology,ChineseAcademyofSciences,Shenyang110016,China;2GraduateUniversityofChineseAcademyofSciences,Beijing100049,China)Abstract:Anewadsorbent,activatedcarbonimpregnatedwithnanozerovalentironwasprepared,whichsizeof
5、theneedleshapedironparticlesintheporesofcarbonwas(30500)nm∃(10003000)nmandapproximately82%ofironwasloadedontoit.Thearsenateremovalpercentagewas995%by15gLNZVIACinthe2mgLarsenicsolutionatpH65and(252)!.Theadsorptioncapacitywasabout154mggwheneq
6、uilibriumconcentrationwas10mgL.KineticsrevealedthatuptakeofarsenateionbyNZVIACwas914%inthefirst12handequilibriumtimewasabout72h.Theintraparticlediffusionmodelwasappliedtostudythemechanicsofarsenateintheactivatedcarbon.Thepresenceofphosphateandsilic
7、atecouldsignificantlydecreasearsenateremovalwhiletheeffectsoftheotheranionsandcationsonthearsenicremovalwereneglectable.NZVIACcanbeeffectivelyregeneratedwhenelutionisdonewith01molLNaOHsolution.OurresultssuggestthatNZVIACisasuitablecandidatefordrink
8、ingwatertreatmentduetoitshighreactivity.Keywords:supportednanozerovalentirononactivatedcarbon(NZVIAC);As();adsorption;drinkingwater砷是高毒元素,是水体中优先控制的污染物之气作保护.将活性炭和FeSO4%7H2O溶于少量水中,[1]一.世界卫生组织(WHO)已将饮用水中砷的允许氮气保护下浸泡一定时间后,再加入乙醇和水,并加量下调为
