| 摘要: |
| 【目的】研究两性表面修饰剂和非离子表面修饰剂复配修饰塿土对重金属Cd2+的吸附动力学特征，为两性-非离子表面修饰剂复配修饰塿土对重金属Cd2+的吸附特征和机制的研究提供理论依据。【方法】以原土，即未修饰塿土(CK)为对照，以十二烷基二甲基甜菜碱(BS)作为两性表面修饰剂，辛烷基酚聚氧乙烯醚(OP)作为非离子表面修饰剂，采用批处理方法，研究20，40 ℃时，BS单一修饰和不同比例BS与OP复配修饰塿土对Cd2+的吸附动力学。【结果】在20和40 ℃，BS-OP复配修饰土娄土吸附Cd2+的快速吸附阶段平均速度（Vf）分别表现为100% BS>50% BS≈50% BS+50% OP>100% BS+100% OP≈100% BS+50% OP>CK>50% BS+100% OP；100% BS>100% BS+50% OP>100% BS+100% OP>50% BS>50% BS+50% OP≈50% BS+100% OP>CK。BS修饰比例相同时，修饰塿土的Vf总体上随着OP修饰比例增大而下降；OP修饰比例相同时，随着BS修饰比例的增加，修饰塿土的Vf均增大。【结论】在两性-非离子表面修饰剂复配修饰土娄土对Cd2+的吸附过程中，BS起促进作用，OP起抑制作用，描述修饰塿土吸附Cd2+的较佳模型是双常数动力学模型。 |
| 关键词: 塿土 Cd2+ 复配修饰 吸附 动力学 |
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| 基金项目:国家自然科学基金项目(40301021) |
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| Adsorption kinetics of Cd2+ on amphoteric nonionic surface active agent co-modified Lou soil |
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| Abstract: |
| 【Objective】 Investigation on the characteristic of adsorption kinetics of Cd2+ on amphoteric-nonionic surface active agent co-modified Lou soil could provide a theoretical foundation for the characteristic and mechanism of adsorption kinetics of Cd2+ on amphoteric-nonionic surface active agent co-modified Lou soil.【Method】 The original soil,unmodified soil (CK),was used as the control,Dodecane Betaine (BS) as amphoteric surface active agent and Octylphenol polyoxyethylene ether(OP) as nonionic surface active agent,to study the kinetics characteristics of Cd2+ adsorption by BS single modified and BS-OP co-modified Lou soil by the batch techniques at 20 and 40 ℃.【Result】 These outcomes indicated that,at 20 and 40 ℃,the fast adsorption velocity(Vf) order was 100% BS>50% BS≈50% BS+50% OP>100% BS+100% OP≈100% BS+50% OP>CK>50% BS+100% OP and 100% BS>100% BS+50% OP>100% BS+100% OP>50% BS>50% BS +50% OP≈50% BS+100% OP>CK respectively on all modified Lou soil in general.The Vf of Cd2+ on co-modified Lou soil with the same BS proportion modified decreased with the rise of OP modified ratio,meanwhile,the Vf of Cd2+ on co-modified Lou soil with the same OP proportion modified increased with the rise of OP modified ratio.【Conclusion】 BS modification can promote the adsorption velocity of Cd2+ on co-modified Lou soil,however,OP co-modification can inhibit the absorption of Cd2+ on BS modified soil.The double constant model is better than other models to describe the absorption kinetic curves of Cd2+ on modified soil. |
| Key words: Lou soil Cd2+ co-modification adsorption kinetics |
