环境化学
孙晓慧,卢瑛莹,沈学优.复合污染中Triton X-100在膨润土/水界面上的吸附行为[J].环境科学学报,2007,27(4):648-654
复合污染中Triton X-100在膨润土/水界面上的吸附行为
- Sorption behavior of Triton X-100 on the interfaceof water and bentonitein combined pollution
- 基金项目：国家自然科学基金(No.20477036,50378081);浙江省科技计划项目(No.2005F13013)
- 作者
- 单位
- 孙晓慧
- 1. 浙江大学环境科学系, 杭州310028; 2. 浙江省环境监测中心, 杭州310012
- 卢瑛莹
- 浙江省环境保护科学设计研究院, 杭州310007
- 沈学优
- 浙江大学环境科学系, 杭州310028
- 摘要：研究了水溶液中膨润土对非离子表面活性剂TritonX-100(X-100)的吸附,重点探讨了阳离子表面活性剂CPC、阴离子表面活性剂SDBS、中性无机盐NaCl及温度对膨润土吸附TX-100的影响.结果表明,Na基膨润土吸附TX-100的效果好于Ca基膨润土;低浓度CPC对膨润土吸附TX-100具有增强作用,当CPC初始浓度大于10000mg·L-1(平衡浓度Ce约为1CMC)时具有抑制作用,当CPC浓度低于3000mg·L-1(Ce约为0.03CMC)时,TX-100吸附量与CPC浓度成线性正相关.SDBS能显著降低膨润土对TX-100的吸附,原因是溶液中SDBS与TX-100混合胶束的形成能阻止TX-100与膨润土硅氧表面间的氢键作用及在其表面形成胶束.NaCl的存在可以大大提高膨润土对TX-100的吸附,去除率由56%提高到99%以上.膨润土对TX-100的吸附随温度升高吸附量增大,其吸附热为12.68kJ·mol-1,标准自由能的减小和熵值的增大是TX-100在膨润土上吸附的推动力.实验结果对用膨润土处理含表面活性剂废水具有一定的理论价值.
- Abstract：Sorption of an nonionic surfactant (Triton X-100, TX-100) on bentonite from water and the effects of ancationic surfactant (Cetyl Pyridinium Chloride, CPC), an anionic surfactant (Sodium Dodecylbenzene Sulfonate, SDBS), sodium chloride (NaCl) and temperatures on TX-100 sorption were investigated. TX-100 sorption on Na-bentonite is greater than on Ca-bentonite, which will be enhanced by CPCwith low concentrations (Ce<0.03CMC) but reduced by CPC with high concentrations (Ce>1CMC) and SDBS. Mixed micelle formation of TX-100 and other surfactants in water could be used to explain the observed TX-100 sorption in the presence of CPCand SDBS. TX-100 sorption will also be enhanced by NaCl enormously, showing the removal rates increase from 56% to 99% when the added NaCl dose is higher than 1.7mol·L-1.The sorption amounts of TX-100 on bentonite were increased with temperatures.The parameter of thermodynamics, ΔH=12.68kJ·mol-1,suggests that the driving force of sorption is the decreasing ΔG0 and the increasing ΔS0.The experimental results provide theoretical values for bentonite application in treatment of wastewater containing surfactants.
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