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1、第40卷第5期湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)Vol.40,No.52013年5月JournalofHunanUniversity(NaturalSciences)May.2013文章編號(hào):1674-2974(2013)05-0092-07*酸改性活性炭吸附甲苯的性能研究李立清,石瑞,顧慶偉,梁鑫,唐琳,李海龍,馬衛(wèi)武(中南大學(xué)能源科學(xué)與工程學(xué)院,湖南長(zhǎng)沙410083)摘要:商業(yè)活性炭分別經(jīng)過(guò)1mol/L的硝酸、鹽酸、硫酸處理.采用Boehm滴定、傅式轉(zhuǎn)換紅外光譜儀(FTIR)、比表面積分析儀對(duì)活性炭樣品的物化性質(zhì)進(jìn)行測(cè)試.以甲苯為吸附質(zhì),在283K下進(jìn)行了固定床吸附實(shí)驗(yàn).研
2、究討論了改性前后活性炭對(duì)甲苯的吸附量影響,計(jì)算了相應(yīng)的動(dòng)力學(xué)參數(shù)和吸附能.結(jié)果表明:酸改性可以增加活性炭表面酸性官能團(tuán)的總數(shù)量;改變孔徑分布.酸改性活性炭對(duì)甲苯的吸附量大小順序?yàn)椋海危粒?,S-AC,AC,Cl-AC.?zhǔn)二階動(dòng)力學(xué)方程比準(zhǔn)一階動(dòng)力學(xué)能更好地描述甲苯在改性活性炭上的吸附過(guò)程;酸改性增大了微孔占有率,提高了吸附速度;酸改性增大活性炭吸附有機(jī)氣體的吸附能,導(dǎo)致酸改性活性炭與甲苯結(jié)合度降低.關(guān)鍵詞:改性活性炭;表面基團(tuán);孔結(jié)構(gòu);吸附動(dòng)力學(xué);吸附能中圖分類(lèi)號(hào):O613.71文獻(xiàn)標(biāo)識(shí)碼:AAdsorptionofTolueneonActivatedCarbonswit
3、hAcidModified,SHIRui,GUQing-wei,LIANGXing,TANGLin,LIHai-long,MAWei-wuLILi-qing(SchoolofEnergyScienceandEngineering,CentralSouthUniv,Changsha,Hunan410083,China)Abstract:Commerciallyactivatedcarbonwastreatedwith1mol/Lnitricacid,1mol/Lsulfuricacidand1mol/Lhydrochloricacidrespectively.Thephy
4、sicochemicalpropertiesofthesemodifiedactivatedcarbonsweredescribedwithBoehmtitration,Fouriertransformedinfraredspectroscopy(FTIR)andBETsurfaceareameasurement.Fixed-bedadsorptionexperimentswereconductedunderthesameexperimentalconditionsat283K,wheretoluenewasactivatedasadsorbates.Adsorption
5、capacityonmodifiedactivatedcarbonswasconducted,combiningthecalculationofdynam-icsandadsorptionenergy.Theresultshaveshownthatthetotalamountofacidgroupsincreasedafteracidmodifica-tionandtheporesizedistributionisdifferentfromtheunmodifiedactivatedcarbon.Theadsorptioncapacityoftolueneonacidmo
6、difiedactivatedcarbonshowsthefollowingorder:N-AC,S-AC,AC,Cl-AC.Thepseudo-second-orderki-neticequationisbetterthanthepseudo-first-orderkineticequationtodescribetheadsorptionprocessoftolueneonthemodifiedactivatedcarbons.Acidmodificationcanincreasethepercentageofmicroporeandenhancetherateofa
7、dsorp-tion.Withtheincreaseofadsorptionenergy,itishardforthemodifiedactivatedcarbonstojointoluene.Keywords:modifiedactivatedcarbon;surfacefunctionalgroups;porestructure;adsorptionkinetics;adsorptionenergy*收稿日期:2012-05-16基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(20676154;20976200)作者簡(jiǎn)介:李立清(19