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1、萬(wàn)方數(shù)據(jù)第33卷第2期硅酸鹽通報(bào)v。1.33N。.2:::!壘!!』塞蘭』.旦墮曼些旦盟Q!!旦墨墾堅(jiān)!盟墾墨墾墾墾壁壘叢!墾量Q墾!!;!蘭!!墊型!翌:蘭Q!蘭硅藻土復(fù)合吸附劑對(duì)水中氨氮的吸附性能研究段寧1,張銀鳳1,明謙2(1.武漢科技大學(xué)資源與環(huán)境工程學(xué)院,武漢430081;2.咸寧市環(huán)境科學(xué)研究院,咸寧437100)摘要:以硅藻土為原料,通過(guò)引入鋼渣復(fù)合的方法制備硅藻土復(fù)合吸附劑,采用x射線衍射(XRD)、付立葉變換紅外光譜(FHR)、掃面電鏡(SEM)和能譜分析(EDS)對(duì)其表征,并且對(duì)氨氮吸附過(guò)程中的動(dòng)力學(xué)性能和熱力學(xué)性能進(jìn)
2、行了研究。研究結(jié)果顯示,硅藻土復(fù)合吸附劑中可能有新的晶相和新的基團(tuán)生成;硅藻土和鋼渣中的金屬物質(zhì)相互作用形成了無(wú)機(jī)硅酸鹽聚合物,硅藻土復(fù)合吸附劑中鈣、鎂、鋁、鐵等金屬元素的含量有所增加。準(zhǔn)二級(jí)動(dòng)力學(xué)模型更適合描述氨氮在硅藻土復(fù)合吸附劑上吸附行為。硅藻土復(fù)合吸附劑吸附氨氮的熱力學(xué)參數(shù)(AG。、△伊和AS。)表明,硅藻土復(fù)合吸附劑對(duì)氨氮的吸附是自發(fā)進(jìn)行的,而且是一個(gè)吸熱過(guò)程,其表觀活化能E。接近40kJ/mol,說(shuō)明物理吸附與化學(xué)吸附同時(shí)存在于該吸附過(guò)程中,且以物理吸附為主。關(guān)鍵詞:硅藻土;復(fù)合吸附劑;氨氮;動(dòng)力學(xué);熱力學(xué)中圖分類(lèi)號(hào):X703
3、文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1001.1625(2014)02-0308-07PreparationofDiatomite-basedAbsorbentandItsAdsorptiveAbilityforAmmoniaNitrogenfromAqueousSolutionDUANNin91,ZHANGYin-fen91,MINGQian2(1.CollegeofNaturalResourceandEnvironmentEngineering,WuhanUniversityofScienceandTechnology,Wuhan430081,C
4、hina;2.XianningAcademyofEnvironmentalSciences,Xianning437100,China)Abstract:Inthepaper,thecompositeabsorbentwaspreparedbyusingdiatomiteandsteelslagasrawmaterials.Theabsorptionability,phasecomposition,microstnlctureandelementalanalysisofthiscompositewerecharacterizedbyFTIR
5、,XRD,SEMandEDS.Thekineticsandthermodynamicsofammonianitrogenadsorptionwereinvestigated.Theresultsshowedthatbycombiningwithsteelslag,somenewcrystallinephasesandbondsmightemergeinthecompositeabsorbent.Themetalliccontentsinsteelslaginteractedwithdiatomite,ledtotheformationof
6、inorganicpolymerizedsiliconcomplexandtheincreaseoftheelementcontentofcalcium,magnesium,aluminumandferruminthecompositeabsorbent.Evaluationoftheexperimentaldataintermsofadsorptionkineticsrevealedthattheadsorptionwasfollowedmoreaccuratelybythepseudo-second-orderkineticmodel
7、.Thecalculatedthermodynamicparameters(AG。,AH。andAS。)showedthattheadsorptionwasspontaneousandendothermic.Moreover,theapparentactivationenergywascloseto40kJ/mol,indicatingthattherewerephysicaladsorptionandchemicaladsorptionduringtheadsorptionprocess,andthephysisorptiontookt
8、hedominantrole.Keywords:diatomite;compositeabsorbent;ammonianitrogen;kinetics;thermodynamics1引言隨