Research on the adsorption capability of iron-carbon co-precipitant for cadmium in water

doi:10.11894/1005-829x.2018.38(3).025

Abstract

Abstract: Under laboratory conditions,ferrihydrite has been prepared,and humic acid-ferrihydrite co-precipitants prepared by adding humic acid in the synthetic process. Using the humic acid-ferrihydrite co-precipitants as adsorbing materials,the adsorption and desorption characteristics of the co-precipitants for Cd(Ⅱ) in water has been researched. The results show that under the best conditions,the maximum removing rate of Cd(Ⅱ) by the co-precipitants can reach 99.76%. The adsorption for Cd(Ⅱ) is relatively firm,and the adsorbed heavy metals are hard to be desorbed. The adsorption and desorption rules of co-precipitants for Cd(Ⅱ) in water can be described by Langmuir isotherm adsorption model,while the adsorption process complies with Lagergren second order kinetics equation.

Key words: ferrihydrite, humic acid, isothermal adsorption

摘要： 在实验室条件下制备水铁矿，并在合成过程中加入腐殖酸制得水铁矿-腐殖酸共沉物。以水铁矿-腐殖酸共沉物为吸附材料，研究其对水中镉的吸附-解吸特征。结果表明，最佳条件下，水铁矿-腐殖酸共沉物对镉的去除率最高可达99.76%；其对镉的吸附较为牢固，吸附后的重金属不易解吸；镉在水铁矿-腐殖酸共沉物上的吸附-解吸规律可用Langmuir等温吸附模型描述，吸附过程符合Lagergren二级动力学方程。

关键词: 水铁矿, 腐殖酸, 等温吸附

CLC Number:

X703.5

Guan Yuli, Zhao Zhuanjun, Zhao Lifang, Zhang Zhaohu, Ben Hexin. Research on the adsorption capability of iron-carbon co-precipitant for cadmium in water[J]. INDUSTRIAL WATER TREATMENT, 2018, 38(3): 25-29.

管宇立, 赵转军, 赵立芳, 张兆虎, 贲贺新. 碳铁共沉物对水中镉的吸附性能[J]. 工业水处理, 2018, 38(3): 25-29.

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URL: https://www.iwt.cn/EN/10.11894/1005-829x.2018.38(3).025

https://www.iwt.cn/EN/Y2018/V38/I3/25

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