改性土壤的制备及其对Hg2+的吸附性能研究
Preparation of Modified Soil and Study on Its Adsorption Properties for Hg2+
王露 1邵延海 2张龚丹3
作者信息
- 1. 昆明理工大学 国土资源工程学院 云南 650093;黄冈市固体废物污染防治中心 湖北 438000
- 2. 昆明理工大学 国土资源工程学院 云南 650093
- 3. 黄冈生态环境监测中心 湖北 438000
- 折叠
摘要
为了经济高效地脱除废水中的重金属汞离子,制备改性土壤作为Hg2+的优良吸附剂.利用 5 种酸性活化剂对土壤进行改性,发现用体积分数为 0.3%的HNO3 洗涤后改性土壤对Hg2+的吸附性能较好.Freundlich方程很好地描述了改性土壤对Hg2+的吸附等温线,改性土壤在进行Hg2+吸附时,最佳pH值为 9.在动力学分析中发现,伪二阶动力学方程更加符合改性土壤对Hg2+的吸附过程.对改性土壤进行脱附再生实验后发现,HCl和乙醇分段式的脱附方式吸附效率最高,达到62.79%.
Abstract
To cost-effectively remove heavy metal mercury ions from wastewater,modified soil was prepared as an excellent adsorbent for Hg2+.Five acidic activators were used to modify the soil,and it was found that the modified soil after washing with 0.3%HNO3 exhibited superior adsorption performance for Hg2+.The Freundlich equation accurately described the adsorption isotherm of the modified soil for Hg2+.The optimal pH for the adsorption of Hg2+by the modified soil was 9.In kinetic analysis,it was discovered that the pseudo-second-order kinetic equation more closely fit the adsorption process of the modified soil for Hg2+.After conducting desorption regeneration experiments on the modified soil,it was dis-covered that the segmented desorption method using HCl and ethanol achieved the highest adsorption efficiency of 62.79%.
关键词
改性土壤/静态吸附/重金属/吸附动力学Key words
modified soil/static adsorption/heavy metals/adsorption kinetics引用本文复制引用
出版年
2025
NETL
NSTL
万方数据