摘要
采用动态吸附法研究霍林河向海湿地表层沉积物在融冻条件下对重金属元素的吸附行为,并探讨了pH值、温度、吸附剂浓度等因素对吸附的影响,绘制了重金属Cu、Zn、Mn、Pb4种元素在融冻条件下的吸附等温线。结果表明,pH值、温度、吸附剂浓度是影响吸附的主要因素,吸附量与吸附剂浓度呈线性关系。在融冻条件下,随着pH值的升高,Cu、Zn的吸附量在pH=6～8之间发生突跃,而Pb则在pH>9时呈现下降趋势。实验范围的温度变化对吸附量的影响不大。4种重金属元素的吸附都符合Langmuir和Freundlich等温方程。
The adsorption properties of heavy metals on sediments in Xianghai wetlands were studied through dynamic simulation technique under freezed- thawed. The influence of pH, temperature and the concentration of adsorbent as well as the adsorption isotherms of Cu, Zn, Mn, Pb were determined and evaluated. It was shown that pH value and the concentration of adsorbent were the main effect factors on the adsorption and the correlation between the adsorption percentage and the concentration of adsorbents was significant. However, the adsorption percentages of Cu and Zn had a sudden change at pH=6～ 8 with the pH increased under freezed- thawed. But the adsorption percentage of Pb was decreased when the pH value was over 9. The adsorption percentage increased with the concentration of adsorbent increased. The adsorption of these heavy metals on the sediments exhibited Langmuir and Freundlich adsorption equations.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2003年第3期325-328,共4页
Journal of Agro-Environment Science
基金
中国科学院创新工程项目(KZCX3-SW-332)
