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《不同粒径铁铝泥对砷(Ⅲ)的吸附效果-论文.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、2第01334年卷7第月7期环境科学Vo1.34,No.7Ju1.,2013ENVIRONMENTALSCIENCE不同粒径铁铝泥对砷(Ⅲ)的吸附效果林璐,胥嘉瑞,吴昊,王昌辉,裴元生(北京师范大学环境学院水沙科学教育部重点实验室,北京100875)摘要:以给水处理厂废弃铁铝泥(ferricandalumwatertreatmentresiduals,FARs)为载体,考察了不同粒径FARs对砷(Ⅲ)的吸附效果.不同粒径FARs的有效铁铝含量、比表面积和孔体积分别为523.72~1861.72mmol-kg~、28.15~265.59m·g和0.03—0.09em·g~,总有机质、富里酸、胡
2、敏酸和胡敏素分别为46.97~91.58、0.02—32.27、22.27~34.09和1O.76~34.22mg·kg~.SEM和XRD检测表明,不同粒径FARs均以无定形结构存在.批量实验结果表明,准一级和准二级动力学方程均能较好地反映FARs吸附砷(Ⅲ)的动力学过程.不同粒径FARs对砷(Ⅲ)的吸附量随着浓度的增加而增高,用Langmuir等温线方程拟合获得理论饱和吸附量在6.72—21.79mg·g之间.pH值对FARs吸附砷(Ⅲ)的作用影响不大.砷(Ⅲ)吸附量大小与不同粒径FARs的理化性质的变化趋势基本一致,由相关性分析可得,有效铁铝含量和孔体积大小是影响FARs对砷(Ⅲ)吸附的
3、主要因素.关键词:粒径;理化性质;铁铝泥;砷(Ⅲ);吸附中图分类号:X703.1文献标识码:A文章编号:0250.3301(2013)07.2758—08EffectivenessofArseniteAdsorptionbyFerricandAlumWaterTreatmentResidualswithDiferentGrainSizesLINLu,XUJia—rui,WUHao,WANGChang-hui,PEIYuan.sheng(KeyLaboratoryofWaterandSedimentSciences,MinistryofEducation,SchoolofEnvironment
4、,BeijingNormalUniversity,Beijing100875,China)Abstract:Effeetivenessofarseniteadsorptionbyferricandalumwatertreatmentresiduals(FARs)withdifferentgrainsizeswasstudied.TheresultsindicatedthatthecontentofactiveFeandA1,thespecificsurfaceareaandporevolumeinFARswithdifferentgrainsizeswereintherangeof523.7
5、2-1861.72mmol·kg一,28.15—265.59m·g一and0.03—0.09cm·g一,respectively.Thecontentsoforganicmatter,fulvicacid,humicacidandhuminwereintherangeof46.97—91.58mg·kg一,0.02—32.27mg·kg一,22.27—34.09mg-kg一and10.76—34.22mg·kg一.respectively.ResultsofSEMandXRDanalysisfurtherdemonstratedthatFARswithdiferentgrainsizeswe
6、reamorphousness.Batchexperimentssuggestedthatboththepseudo-first—orderandpseudo—second—orderequationscouldwelldescribethekineticsadsorptionprocessesofarsenitebyFARs.Moreover,thecontentsofarseniteabsorbedbyFARsincreasedwiththeincreaseofarseniteconcentrations.Thetheoreticalsaturatedadsorptioncapaciti
7、escalculatedfromLangmuirisothermmodelwereintherangeof6.72—21.79mg·g~.Interestingly,pHshowedlittleeffectonthearseniteadsorptioncapabilityofFARs.ThecapabilityofFARshadacloserelationshipwiththeirphysic0chemica
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