不同吸附材料对废水中Cd(Ⅱ)的吸附动力学及机理
Adsorption Kinetics and Mechanism of Different Adsorption Materials for Cd(Ⅱ)in Wastewater
双生晴1
作者信息
- 1. 中铝环保节能科技(湖南)有限公司,湖南 长沙 410019
- 折叠
摘要
选择稻壳生物炭、钠基膨润土和天然硅藻土3种常见吸附材料,进行了系列吸附试验,并采用扫描电镜(SEM)和傅里叶红外光谱(FTIR)分析对吸附材料进行了表征,研究3种吸附材料对污水中Cd(Ⅱ)的吸附动力学及吸附机理,结果表明:3种吸附材料对Cd(Ⅱ)的吸附都符合准二级动力学模型,对溶液中Cd(Ⅱ)的吸附均为物理-化学复合过程.生物炭对溶液中Cd(Ⅱ)的吸附机制主要是其孔道内的钙氧化物以及表面的含氧官能团,膨润土和硅藻土则主要依赖于比表面积、表面微孔和双键官能团作用.
Abstract
This paper selected the rice husk biochar,sodium bentonite and natural diatomite for adsorption materi-als,and conducted a series of adsorption experiments.SEM and FTIR analysis were used to characterize the ad-sorption materials,and the adsorption kinetics and mechanism of the three adsorption materials on Cd(Ⅱ)in wastewater were studied.The results showed that the adsorption of Cd(Ⅱ)on the three adsorbents is in accord-ance with the pseudo second order kinetic model,and it is a physical-chemical complex process.The adsorption mechanism of biochar for Cd(Ⅱ)in solution is mainly the calcium oxide in the pores and oxygen-containing functional groups on the surface,while bentonite and diatomite mainly depend on the specific surface area,surface micropore and double bond functional groups.
关键词
稻壳生物炭/钠基膨润土/天然硅藻土/含Cd(Ⅱ)废水/吸附效果Key words
rice husk biochar/sodium bentonite/natural diatomaceous/wastewater containing Cd(Ⅱ)/adsorption efficiency引用本文复制引用
出版年
2024
NETL
NSTL
万方数据