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1、中国环境科学2011,31(7)：1186~1191ChinaEnvironmentalScience几种基质对水中磷的吸附特性1,2,31,21*朱文涛,司马小峰,方涛(1.中国科学院水生生物研究所,湖北武汉430072；2.中国科学院研究生院,北京100049；3.山西省生态环境研究中心,山西太原030002)摘要：选取钢渣、活性炭、天然沸石、粗砂4种基质,结合矿物成分分析研究其对磷的等温吸附特征和吸附动力学过程,并考察pH值对其吸附磷的影响.结果表明:活性炭、天然沸石、粗砂的等温吸附特征与Freundlich方程拟合较好(r>0.9);而钢渣更符合Langmuir方程.其吸附能
2、力大小为:钢渣>活性炭>沸石>粗砂.沸石、粗砂对磷酸盐的吸附以物理吸附为主,钢渣以化学吸附为主,而活性炭在前期以物理吸附为主,后期则以化学吸附为主.Elovich方程和双常数速率方程能较好的反映4种基质对磷的吸附动力学特征.pH值的变化对钢渣的吸附性影响不大,沸石在酸性及弱碱性条件下对磷的吸附性相当,活性炭在pH3~13吸附量维持在190mg/kg左右,粗砂在pH3时吸附量达最大,综合而言,在土地处理系统的实际应用中,选取钢渣可获取最佳的除磷效果.关键词：基质；磷；等温吸附；动力学；pH值中图分类号：X52文献标识码：A文章编号：1000-6923(2011)07-1186-061,
3、21,2Thecharacterofphosphorousadsorptioninwaterondifferentsubstrates.ZHUWen-tao,SIMAXiao-feng,1*FANGTao(1.InstituteofHydrobiology,ChineseAcademyofSciences,Wuhan430072,China；2.GraduateUniversityoftheChineseAcademyofSciences,Beijing100049,China；3.ResearchCenterforEco-EnvironmentalSciences,ShanxiPr
4、ovince,Taiyuan030002,China),ChinaEnvironmentalScience,2011,31(7)：1186~1191Abstract：Phosphorusadsorptionisothermsandadsorptionkineticsofsteelslag,activatedcarbon,naturalzeoliteandcoarsesandwerestudied,andtheeffectofpHvalueonphosphorusadsorptionwasevaluated.Theresultsshowedthat,theadsorptionisoth
5、ermsofactivatedcarbon,naturalzeoliteandsandqualifiedFreundlichequation(r>0.9),andsteelslagfittedLangmuirequation.Theadsorptivecapacitywasrangedassteelslag>activatedcarbon>zeolite>coarsesand.Theadsorptionmechanismsofzeoliteandcoarsesandwerephysicaladsorption,andthatofslagwaschemicaladsorption.Ph
6、osphorusadsorptionbyactivatedcarbonwasphysicaladsorptionfirstly,andthenchemicaladsorption.PhosphorusadsorptionkineticsofthefourkindsofsubstratescanbedescribedasElovichequationandtwo-constantrateequation.TheeffectofpHvalueonthesteelslagadsorptioncapacitywasindistinct.Theadsorbilityofzeoliteunder
7、theconditionofacidandalkalescencewerethesame.WhenpHvaluewas3to13,theadsorptioncapacityofactivatedcarbonremainedat190mg/kg.TheadsorptioncapacityofcoarsesandwasmaximumwhenpHwas3.Accordingtoourresearch,steelslagwastheoptimalsubstrate
