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1、第34卷第12期環(huán)境科學(xué)學(xué)報(bào)Vol.34,No.122014年12月ActaScientiaeCircumstantiaeDec.,2014DOI:10.13671/j.hjkxxb.2014.0651邵一敏,孫強(qiáng)強(qiáng),張秋云,等.2014.鎳改性MCM?41介孔分子篩對(duì)水中甲基藍(lán)的吸附[J].環(huán)境科學(xué)學(xué)報(bào),34(12):3011?3016ShaoYM,SunQQ,ZhangQY,etal.2014.ApplicationofnickelmodifiedMCM?41asanadsorbenttoremovemethylbluef
2、romaqueoussolution[J].ActaScientiaeCircumstantiae,34(12):3011?3016鎳改性MCM?41介孔分子篩對(duì)水中甲基藍(lán)的吸附?邵一敏,孫強(qiáng)強(qiáng),張秋云,李來(lái)勝,劉佩紅華南師范大學(xué)化學(xué)與環(huán)境學(xué)院,廣州510006收稿日期:2014?01?16修回日期:2014?03?05錄用日期:2014?03?08摘要:通過(guò)水熱法合成介孔分子篩MCM?41,采用等體積浸漬法制備了Ni負(fù)載MCM?41分子篩吸附劑(Ni/MCM?41).小角X?射線粉末衍射(XRD)表征結(jié)果顯示,Ni/MCM?
3、41保持了純硅MCM?41有序的介孔結(jié)構(gòu),并研究了Ni/MCM?41對(duì)水中甲基藍(lán)的吸附去除性能,考察了投加量、反應(yīng)時(shí)間、pH值、溫度對(duì)水中甲基藍(lán)去除率的影響,并從吸附等溫線探討了吸附機(jī)理.在優(yōu)化條件下(25℃,20mg投加量,6.32pH,-1-150mg·L甲基藍(lán)),反應(yīng)120min后,Ni/MCM?41對(duì)甲基藍(lán)吸附量為36.85mg·g,是MCM?41的7.1倍.研究表明吸附等溫線符合Freuulich和Dubinin?Radushkevich模型,最大吸附量隨著溫度的升高而升高,吸附為吸熱過(guò)程.通過(guò)Zeta電位分析認(rèn)為,
4、靜電作用是甲基藍(lán)吸附的主要機(jī)理.關(guān)鍵詞:Ni/MCM?41;甲基藍(lán);吸附;等溫線文章編號(hào):0253?2468(2014)12?3011?06中圖分類(lèi)號(hào):X703文獻(xiàn)標(biāo)識(shí)碼: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然運(yùn)行成本低,但不能使染料廢水完全脫色,且對(duì)1引言(Introduction)微生物有毒副作用.而吸附法作為一