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ID:36719340
大小:2.56 MB
页数:6页
时间:2019-05-14
《镍改性MCM41介孔分子筛对水中甲基蓝的吸附》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34卷第12期环境科学学报Vol.34,No.122014年12月ActaScientiaeCircumstantiaeDec.,2014DOI:10.13671/j.hjkxxb.2014.0651邵一敏,孙强强,张秋云,等.2014.镍改性MCM⁃41介孔分子筛对水中甲基蓝的吸附[J].环境科学学报,34(12):3011⁃3016ShaoYM,SunQQ,ZhangQY,etal.2014.ApplicationofnickelmodifiedMCM⁃41asanadsorbenttoremovemethylbluef
2、romaqueoussolution[J].ActaScientiaeCircumstantiae,34(12):3011⁃3016镍改性MCM⁃41介孔分子筛对水中甲基蓝的吸附∗邵一敏,孙强强,张秋云,李来胜,刘佩红华南师范大学化学与环境学院,广州510006收稿日期:2014⁃01⁃16修回日期:2014⁃03⁃05录用日期:2014⁃03⁃08摘要:通过水热法合成介孔分子筛MCM⁃41,采用等体积浸渍法制备了Ni负载MCM⁃41分子筛吸附剂(Ni/MCM⁃41).小角X⁃射线粉末衍射(XRD)表征结果显示,Ni/MCM⁃
3、41保持了纯硅MCM⁃41有序的介孔结构,并研究了Ni/MCM⁃41对水中甲基蓝的吸附去除性能,考察了投加量、反应时间、pH值、温度对水中甲基蓝去除率的影响,并从吸附等温线探讨了吸附机理.在优化条件下(25℃,20mg投加量,6.32pH,-1-150mg·L甲基蓝),反应120min后,Ni/MCM⁃41对甲基蓝吸附量为36.85mg·g,是MCM⁃41的7.1倍.研究表明吸附等温线符合Freuulich和Dubinin⁃Radushkevich模型,最大吸附量随着温度的升高而升高,吸附为吸热过程.通过Zeta电位分析认为,
4、静电作用是甲基蓝吸附的主要机理.关键词:Ni/MCM⁃41;甲基蓝;吸附;等温线文章编号:0253⁃2468(2014)12⁃3011⁃06中图分类号:X703文献标识码:AApplicationofnickelmodifiedMCM⁃41asanadsorbenttoremovemethylbluefromaqueoussolution∗SHAOYimin,SUNQiangqiang,ZHANGQiuyun,LILaisheng,LIUPeihongSouthChinaNormalUniversity,Guangzhou51
5、0006Received16January2014;receivedinrevisedform5March2014;accepted8March2014Abstract:MesoporousMCM⁃41andNiloadedMCM⁃41(Ni/MCM⁃41),preparedbyhydrothermalanddippingmethodrespectively,wereemployedasnoveladsorbentsformethylblue(MB)inaqueoussolution.ThelowangleXRDpattern
6、sshowedthatitretainedthemesoporousstructureofMCM⁃41afterinvestigated.Impactofvariousparameters,includingadsorbentdosage,contacttime,pHandtemperature,onadsorptionofMBbyNi/MCM⁃41was-1investigated).Underthechosencondition(25℃,20mgadsorbentdosage,6.32pH,and50mg·LMB),ahi
7、ghMBadsorptioncapacity(36.85-1mg·g)wasachievedbyNi/MCM⁃41processat120min,7.1timeshigherthanMCM⁃41.AdsorptionofMBonNi/MCM⁃41isanendothermicprocess.TheexperimentaldatafittedwelltoFreundlichandDubinin⁃Radushkevichisotherms.Theelectrostaticinteractionwasconsideredtobeth
8、emainmechanismfortheMBadsorption.Keywords:Ni/MCM⁃41;methylblue;adsorption;isotherms然运行成本低,但不能使染料废水完全脱色,且对1引言(Introduction)微生物有毒副作用.而吸附法作为一
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