针铁矿及蒙脱石对菲吸附解吸行为及热力学探究

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1、针铁矿及蒙脱石对菲吸附解吸行为及热力学探究收稿日期：20110408基金项目：国家自然科学基金项目(41072034,40773080)；广东省自然科学基金项目(10151063101000028)作者简介：刘晓华(1987),女，广东丰顺人，理学硕士研究生，从事环境生态矿物学研究，Email：lxheba@126.com。文章编号：16726561(2012)01004007针铁矿和蒙脱石对菲的吸附解吸行为与热力学研究刘晓华，吴宏海，管玉峰，曾丽璇，邓达义，何广平(华南师范大学化学与环境学院，广东广州510006)摘

2、要：采用批量振荡吸附平衡法设计针铁矿和蒙脱石对菲的吸附解吸试验，对比研究了针铁矿和蒙脱石对菲的吸附解吸行为，并考察了不同K+浓度的溶液对蒙脱石吸附菲的影响，比较分析了线性吸附模型和Freundlich吸附模型描述矿物吸附等温线的准确性，并从吸附热力学角度探讨了矿物的吸附机理。结果表明：针铁矿和蒙脱石对菲的吸附解吸均表现出明显的非线性和解吸滞后现象；相对于线性吸附模型来说，针铁矿和蒙脱石对菲的吸附解吸更符合Freundlich吸附模型；与蒙脱石相比，针铁矿对菲的吸附更为显著，且具有更好的稳定性；溶液中软阳离子K+的存在使

3、蒙脱石对菲的吸附能力得到显著提高；菲在蒙脱石和针铁矿上的吸附过程是一个自发放热，同时伴随着爛值减小的过程；随着温度的升高，蒙脱石和针铁矿对菲的吸附能力均减弱。关键词：热力学；吸附；解吸；等温线；针铁矿；蒙脱石；菲；多环芳炷中图分类号：P579文献标志码：AStudyonthebehaviorsandthermodynamicsofsorptionanddesorptionofgoethiteandturfacetophenanthreneLIUXiaohua,WUHonghai,GUANYufeng,ZENGLixua

4、n,DENGDayi,HEGuangping(SchoolofChemistryandEnvironment,SouthChinaNormalUniversity,Guangzhou510006,Guangdong,China)Abstract：Thebatchvibratedadsorptionbalaneemethodwasusedtodesigntheexperimentwhichincludedthesorptionanddesorptionofgoethiteandturfacetophenanthrene.

5、Thebehaviorsofsorptionanddesorptionwerestudied；theinfluencesofsorptionofturfacetophenanthrenewerediscussedwhentheconcentrationsofK+weredifferentinsolution；thesorptionisothermsofmineralscalculatedbylinearsorptionmodelandFreundlichsorptionmodelwerecompared；thesorp

6、tionmechanismofmineralswerediscussedbasedonsorptionthermodynamics・Theresultsshowedthatthesorptionanddesorptionofgoethiteandturfacewerenonlinearandhysteretic；comparedwithlinearsorptionmodel,thesorptionanddesorptionofgoethiteandturfaceweremoreinaccordwithFreundlic

7、hsorptionmodel；thesorptionofgoethitewasstrongerandmoresteadythanthatofturface；thesoftcationK+significantlyimprovedthesorptionofturface；thesorptionprocessesofsorptionofturfacetophenanthrenewerespontaneousexothermic,accompaniedwiththeprocessofentropydecrease；theso

8、rptionabilityofgoethiteandturfacetophenanthrenewasweakenwiththetemperatureincreased.Keywords：thermodynamics；sorption；desorption；isotherm；goethite；turface；phenanthrene