双阳离子有机膨润土吸附水中有机物的特征及机理研究

The characteristics and mechanismsfor dual cation organobentonitesto sorb organic compoundsfrom water

研究了双阳离子有机膨润土吸附水中对硝基苯酚、苯酚、苯胺的特征及机理．结果表明，双阳离子有机膨润土对水中有机物的等温吸附曲线符合Ｌａｎｇｍｕｉｒ 和Ｆｒｅｕｎｄｌｉｃｈ 吸附等温式，是分配作用（ｐａｒｔｉｔｉｏｎ） 和表面吸附（ａｄｓｏｒｐｔｉｏｎ） 共同作用的结果．首次定量描述了分配作用和表面吸附在双阳离子有机膨润土吸附有机物中的相对贡献率；它们均为浓度的函数，在低浓度时，双阳离子有机膨润土对有机物的吸附作用以表面吸附为主；在高浓度时。

Aseriesofdual cationorganobentonitesaresynthesizedbyreplacingthe metalionsin bentonite with both long chain alkyl or aryl quaternary ammonium cations,such as dodecyltrimethylam monium ( DTMA), tetradecyltrimethylammonium ( TPA), cetyltrimethylam monium ( CTMA), octade cyltrimethylammonium (OTMA),andshort chain alkylorarylquaternaryam monium cations,such aste tramethylammonium (TMA) .Theoptimalconditionsandthe propertiesfor dual cation organobentonites to sorb p nitrophenol,phenoland anilinefrom waterareinvestigated.The mechanismsand characteristics oftheinteractionsbetween organicpollutantsand theorganic phaseofthe bentonitein watersystem are also discussed.The interlayer spacings,organic carbon contents and sorption properties of dual cation organobentonitesare related to the ratio oflong to short chain quaternary ammonium cations,and the length ofalkyl chain oflargequaternaryammonium cationsexchanging on bentonite.Thesorption ofor ganic compoundsto dual cation organobentonitesis also related to the properties oforganic compounds. Sorptionisothermsofp nitrophenol,phenolandanilinearetypically nonlinear,andtheisothermsfitclosely to Freundlich or Langmuirequation.Both adsorption and partition occurtothe sorption of organic com poundsto dual cation organobentonites.Theseparatecontributionsofadsorptionand partitiontothetotal sorption oforganiccompoundstodual cationorganobentonitesareanalyzed mathematically;therelativeef fectisafunction oftheequilibrium concentration oftheorganiccompounds.