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时间:2020-03-26
《改型凹凸棒土对磷酸根吸附性能的研究.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、第22卷第8期化学研究与应用Vo1.22,No.82010年8月ChemicalResearchandApplicationAug.,2010文章编号:1004-1656(2010)08-1009-06改型凹凸棒土对磷酸根吸附性能的研究仇立干,王茂元(江苏省滩涂生物资源与环境保护重点建设实验室;盐城师范学院化学化工学院,江苏盐城224051)摘要:天然凹凸棒土(AT)经盐酸和热处理制得活化凹凸棒土(MAT),以壳聚糖改性MAT制得复合吸附剂(CMAT)。用扫描电镜(SEM)和红外光谱(IR)对AT、MAT和CMAT的结构进行了表征。考察了磷酸盐溶液初始浓度、pH、吸附时间以及吸附温度对CMA
2、T和MAT吸附磷酸根性能的影响,得出了适宜的吸附条件。用IR对适宜条件下吸附产物的结构进行了表征。结果表明,CMAT吸附磷酸根的适宜条件为:磷酸盐溶液初始浓度0.3106g·L一,pH4.70~6.72,吸附时问lh,吸附温度35cc,在该条件下最大吸附容量为90.6mg·g一;MAT吸附的适宜条件为:磷酸盐溶液初始浓度0.2101g·L~,pH3.61~5.8l,吸附时间lh,吸附温度35℃,在该条件下最大吸附容量为68.9mg·g。。。在相同实验条件下,CMAT对磷酸根的吸附性能高于MAT,且二者的吸附行为均符合Langmuir和Freundlich吸附等温式。IR分析表明,CMAT对磷
3、酸根的吸附包含化学吸附和物理吸附两个过程,而MAT主要是物理吸附。关键词:凹凸棒土;壳聚糖;改性;磷酸盐;吸附中图分类号:0613.6文献标识码:AStudyontheadsorptionofthemodifiedattapulgiteforphosphateQiuLi—gan,WangMao—yuan(JiangsuProvincialKeyLaboratoryofCoastalWetlandBioresourcesandEnvironmentalProtection,SchoolofChemistryandChemicalEngineering,YanchengTeachersUnive
4、rsity,Yancheng224051,China)Abstract:Themodifiedattapulgite(MAT)wasobtainedbynatureattapulgite(AT)andhydrochloricacid,theattapulgitecom-pound(CMAT)waspreparedwithMATandchitosan,andAT,MATandCMATwerecharacterizedbySEMandIR.Theefectsofinitialconcentrationofphosphate,absorptiontime,pHandabsorptiontemper
5、atureontheadsorptivecapacityofthetwoadsorbentsforphosphatewereinvestigated,respectively.Theoptimumconditionsofadsorptionwereobtained,andtheproductsobtainedundertheoDtimumconditionswerecharacterizedbyIR.TheresultsshowedthattheoptimumconditionsofadsorptionofCMATwere:ini—tialconcentrationofphosphate0.
6、3106g·L~.pH4.70~6.72,adsorptiontime1handadsorptiontemperature35℃.TheoptimumconditionsofadsorptionofMATwere:initialconcentrationofphosphate0.2101g·L。。,pH3.61—5.81,adsorptiontime1handadsorptiontemperature35oC.TheadsorptivecapacityofCMATforphosphateWashi【sherthanthatofMATunderthesanleeondi’tions.andbo
7、thofthemobeyedtheLangmuirandFreundliehequations.TheresultsofIRindicatedthatbothchemicalandphysicaladsorptionexistedintheadsorptionofCMATforphosphate,butphysicaladsorptionwasdominantintheadsorptionofMATforph
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