摘要
采用静态吸附法研究了新疆某石化企业污水库周边土壤对重金属钴的吸附特征,考察了溶液p H值、钴离子平衡质量浓度、背景电解质浓度、吸附时间和环境温度等因素对钴吸附量的影响,并对吸附机理进行了初步探讨。结果表明：溶液p H值为1~4时,改变p H值对土壤吸附钴的影响显著;吸附时间在3 h左右时钴吸附量趋于稳定;随溶液背景电解质浓度增大,土壤对钴的吸附量呈现先急剧后缓慢的下降趋势;土壤对钴的吸附量随温度升高而增加。拟合结果表明,Langmuir和Freundlich模型能较好地描述土壤对钴吸附的热力学过程;在3 h内,土壤对钴吸附的动力学过程可以用一级反应动力学方程表示。方差分析结果表明,对土壤吸附钴量有显著性影响的因素有溶液p H值、钴离子平衡浓度、吸附时间和温度等。
The paper is inclined to introduce our on-spot investigation and analysis results of the adsorption features of heavy metal cobalt by the soil which is around a Xinjiang Wujiaqu sewage depository or a pool by means of a static adsorption method. What we were inclined to investigate and find is the effects of the adsorption conditions such as p H value,initial concentration of cobalt ions,ionic strength,adsorption time,as well as the temperatures on the adsorption features of cobalt and the adsorption mechanism concerned. The results of our investigation and analysis show that the adsorption capacity of the soil under study to the cobalt turns out to be quite high. What is more,the p H value of the heavy metal liquid has a significant effect on the soil＇s adsorption for cobalt. More exactly speaking,the higher the p H value,the greater the adsorptive capacity the soil may have to the cobalt in case. When the adsorption time reaches about 3 hours,the adsorption capacity of the tested soil to the cobalt tends to get stable and then there has not been any obvious change with the prolonging of the time. On the other hand,the adsorption capacity of the tested soil to the cobalt in case tends to decrease slowly after a sharp decline with the increase of the ionic strength of the solution. As for the effect of the temperature on the adsorption strength,the investigation and analysis results reveal that,the higher the temperature rises,the stronger the adsorption capacity the soil tends to have. On the other hand,the experimental data of the linear fit shows that Langmuir model and Freundlich model can be used here to describe the thermodynamic process of cobalt sorption properly. Within the 3 hours of kinetic adsorption,the dynamic process of the adsorption of the cobalt by the soil can better be descried by means of the first-order kinetic equation.We have also found that when the SPSS statistics software was used for the experimental data analysis,the obtained data tend to show that the p H value,the initial concentr
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第3期256-260,共5页
Journal of Safety and Environment
基金
新疆大学2012年校院联合资助项目(XY110110)
关键词
环境工程学
污水库
土壤
钴
吸附
方差分析
environmental engineering
sewage reservoir
soils
cobalt
adsorption
analysis of variance
