钢渣吸附去除水中亚甲基蓝

通过静态批式实验研究钢渣对亚甲基蓝吸附行为的影响.结果表明:亚甲基蓝去除率随钢渣投加量的增加而增大，随初始浓度的升高而降低，而单位钢渣质量下亚甲基蓝的吸附量呈相反趋势.溶液初始pH值为4时最有利于钢渣吸附亚甲基蓝.钢渣吸附亚甲基蓝符合Lagergren准一级动力学方程，平衡吸附量随亚甲基蓝初始质量浓度的增加而增大，随钢渣投加量增加而减小.结合Freundlich等温吸附方程发现，钢渣对亚甲基蓝的吸附是以离子交换作用为主的优惠型吸附.亚甲基蓝阳离子在静电力作用下吸附在钢渣表面，并与CaO等反应形成聚合物，增强吸附效能.

Removing Methylene Blue from Water by Steel Slag Adsorption

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.