Removing Methylene Blue from Water by Steel Slag Adsorption

被引：3
作者：
Hu E.-Z. [1 ]
Li Q.-Y. [1 ]
Gao H. [1 ]
Wang N.-N. [1 ]
机构：
[1] School of Metallurgy, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2018年 / 39卷 / 04期
关键词：
Adsorption; Adsorption isotherm; Kinetics; Methylene blue; Steel-slag;
D O I：
10.12068/j.issn.1005-3026.2018.04.013
中图分类号：
学科分类号：
摘要：
The effect of steel slag on adsorption behavior of methylene blue was studied using static batch experiments. The experimental results showed that the removal rate of methylene blue increases with the increase of the steel-slag dosage and decreases with the initial concentration of methylene blue. However, the removal efficiency, (i.e. the adsorbance per unit quality of the adsorbent) denotes an opposite tendency. When the initial pH value of the solution is 4, the adsorption of methylene blue onto steel slag is the best. The adsorption kinetics of methylene blue by steel slag obeys the Lagergren first-order equation. The equilibrated adsorption capacity increases with the increase of the initial concentration of methylene blue, while decreases with the increase of the steel-slag dosage. Analyzed by the Freundlich isotherm model, it indicates that the adsorption of methylene blue by steel slag is a favorable and spontaneous adsorption, which is mainly deduced by ion exchange in the outer surface of steel slag. The cations of methylene blue adsorb on the negative-charged spots on the steel-slag surface, meanwhile the adsorption can also be enhanced by the polymer formed by the methylene blue reacted with CaO. © 2018, Editorial Department of Journal of Northeastern University. All right reserved.
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页码：516 / 521
页数：5
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