摘要
水土体系下,应用批实验法研究了Triton X-100在天然黄土上的吸附行为与平衡时间、Triton X-100浓度、溶液离子强度和pH值的关系.结果表明,Triton X-100在黄土中的吸附平衡时间约为30 min,其吸附动力学符合一级动力学模型,相应拟合参数Qe、k1、r2分别为3.041 mg·g-1、0.102 min-1、0.993 4.吸附等温线明显为非线性,在利用的4种等温吸附模型中,Sips模型对实验数据提供了最佳的拟合,其拟合参数Qmax和r2分别为3.202 mg·g-1和0.998 7.溶液离子强度和pH值对Triton X-100在黄土上的吸附有显著的影响,其吸附量随NaCl浓度的增加而明显增加,随pH增加而降低.
Batch experiments involving soil-aqueous systems were conducted to determine sorption of Triton X-100 onto natural loess as a function of equilibrium time, Triton X-100 concentration, ionic strength, and pH value. The results showed that the equilibration time for sorption of Triton X-100 onto loess was about 30 min. The sorption kinetics of Triton X-100 fitted well to the pseudo-first-order kinetic model and the corresponding parameters Qo, k1, and r2 were 3. 041 mg·g-1, 0. 102 min-l, and 0. 993 4, respectively. Sorption isotherm was found to be distinctly nonlinear. The Sips model provided the best fitting to the experimental data among the four isothermal models tested. Qma~ and r2 of Sips model were 3. 202 mg. g 1 and 0. 998 7, respectively. It was found that the ionic strength and the pH of the solution had a significant influence on the sorption of Triton X-100 onto loess. The amount of Triton X-100 sorbed onto the loess increased significantly with increasing concentration of NaC1. Sorption of Triton X-100 onto loess was influenced greatly by pH, the amount of Triton X-100 sorbed decreased as the pH increased.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第3期1114-1119,共6页
Environmental Science
基金
国家自然科学基金项目(41261077)
甘肃省自然科学基金项目(1010RJZA068
1010RJZA070)
兰州交通大学科技支撑基金项目(ZC2012002)
