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以钠基膨润土为原料,采用十六烷基三甲基溴化铵(CTMAB)、十二烷基硫酸钠(SDS)、聚合羟基铁离子作为插层改性剂,制备出多种有机、无机、复合插层改性膨润土。运用X射线荧光光谱、扫描电镜、X射线衍射及红外光谱分析等手段研究了各插层改性膨润土的微结构变化及对苯酚和4-氯苯酚的吸附行为。结果表明:不同改性剂的插层改性效果不同,CTMAB效果最好;2种复合插层改性膨润土的层间结构有着明显的差异,CTMAB-Fe复合插层土中聚合羟基铁离子分布于有机相之外,SDS-Fe复合插层土中聚合羟基铁离子镶嵌于SDS单分子层中;各插层改性土之间吸附量的大小关系与层间距的大小关系基本一致;CTMAB插层改性膨润土对苯酚和4-氯苯酚的吸附均符合Langmuir等温方程,吸附过程均为优惠吸附。
Using sodium bentonite as raw material, cetyltrimethylammonium bromide (CTMAB), sodium dodecyl sulfate (SDS) and polymeric hydroxyiron ion as intercalation modifiers, a series of organic and inorganic , Composite intercalation modified bentonite. The microstructure changes of bentonite and the adsorption behavior of phenol and 4-chlorophenol were studied by X-ray fluorescence spectroscopy, scanning electron microscopy, X-ray diffraction and infrared spectroscopy. The results show that the effect of intercalation modification of different modifiers is different, and CTMAB is the best. The interlayer structure of two composite intercalated modified bentonites has obvious difference. The distribution of polymeric ferric hydroxides in CTMAB-Fe composite intercalated soil In addition to the organic phase, the polymerized hydroxy ferric ions in the SDS-Fe composite intercalated soil are embedded in the monolayer of SDS. The relationship between the adsorbed amount and the inter-layer spacing is basically the same in each intercalated layer. The CTMAB The modified bentonite for phenol and 4-chlorophenol adsorption are in line Langmuir isothermal equation, the adsorption process are preferential adsorption.