摘要
研究了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)对重油在海洋沉积物上吸附的影响。结果表明,在CTAB初始质量浓度为0～20mg/L时,海洋沉积物对重油的吸附动力学过程符合伪二级吸附动力学方程,伪二级吸附速率常数随CTAB初始浓度增加、温度的升高而增大;吸附等温线符合Freundlich方程。随着CTAB初始浓度和盐度的增加、温度的降低,重油在海洋沉积物上的吸附量增大。标准吸附焓变(ΔH0)、标准吉布斯自由能变(ΔG0)、标准吸附熵变(ΔS0)的计算结果表明,重油在海洋沉积物上的吸附为物理吸附,是一个自发、放热、熵减小的过程。
Batch tests of heavy oil adsorption on marine sediment were conducted to determine the effect of cationic surfactants cetyltrimethylammonium bromide （CTAB） on adsorption capacity. The results showed that the pseudo-second-order model fitted the dynamic adsorption data better than pseudo-first-order model. The adsorption rate constant increased with increasing initial CTAB concentration and temperatures. The effects of initial CTAB con- centration, salinity and temperature on adsorption isotherms were investigated, it was found that the experiment data could be well described by Freundlich equation, and the higher initial CTAB concentration, salinity and lower temperature could result in a higher adsorption capacity. The sorption capacity was favorably influenced by increasing initial CTAB concentration, salinity and decreasing temperature. The thermodynamic parameters such as standard enthalpy change （△H°）, standard gibbs free energy change （△G°）, and standard entropy change （△S°） were also determined, which indicated that the sorption was a physical process and was spontaneous and exothermic with a decrease randomness.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第8期14-19,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.40876037)
