天然菱铁矿去除水中磷的性能研究
发布时间：2019-01-05 03:44
【摘要】：采用批次试验研究菱铁矿对水溶液中磷的吸附特性,考察了初始磷浓度、p H值、菱铁矿投加量、粒径、共存离子对吸附的影响,并探讨了吸附动力学和吸附热力学特征.结果表明,当磷溶液初始浓度为20 mg·L-1,初始p H为6.0时,菱铁矿对磷的吸附效果较好,吸附平衡时间为48h.菱铁矿投加量为0.5~10 g时,随着投加量的增加,菱铁矿对磷的吸附效能逐渐提高.相对于NO-3、Cl-而言,SO2-4、HCO-3对菱铁矿去除磷有微弱的抑制作用.动力学研究发现,菱铁矿对磷的吸附过程更符合准二级动力学模型,吸附平衡可由Freundlich等温线方程描述,饱和吸附量为83.5μg·g-1.最后分别计算了288、303和318 K下的吸附热力学参数,发现吉布斯自由能(ΔG)均为负,焓变(ΔH)及熵变(ΔS)为正,表明该吸附过程为自发的吸热反应.
[Abstract]:The adsorption characteristics of phosphorus in aqueous solution by siderite were studied by batch test. The effects of initial phosphorus concentration (, p H), siderite dosage, particle size and coexisting ions on the adsorption were investigated. The adsorption kinetics and thermodynamic characteristics were also discussed. The results show that when the initial concentration of phosphorus solution is 20 mg L ~ (-1) and initial pH is 6.0, the adsorption efficiency of siderite is better and the adsorption equilibrium time is 48 h. When the dosage of siderite is 0.5 ~ 10 g, the adsorption efficiency of siderite to phosphorus increases with the increase of the amount of siderite. Compared with NO-3,Cl-, SO2-4,HCO-3 has a weak inhibitory effect on phosphorus removal from siderite. The kinetic study shows that the adsorption process of phosphorus on siderite is more in accordance with the quasi-second-order kinetic model, the adsorption equilibrium can be described by Freundlich isotherm equation, and the saturated adsorption capacity is 83.5 渭 g g-1. Finally, the adsorption thermodynamic parameters at 288303 and 318K were calculated. It was found that the Gibbs free energy (螖 G) was negative, the enthalpy change (螖 H) and entropy change (螖 S) were positive, which indicated that the adsorption process was spontaneous endothermic reaction.
【作者单位】： 南京大学环境学院污染控制与资源化研究国家重点实验;
【基金】：江苏省科技厅政策引导类计划项目(No.BY2015060-05) 污染控制与资源化研究国家重点实验室开放基金~~
【分类号】：X703
本文编号：2401219
[Abstract]:The adsorption characteristics of phosphorus in aqueous solution by siderite were studied by batch test. The effects of initial phosphorus concentration (, p H), siderite dosage, particle size and coexisting ions on the adsorption were investigated. The adsorption kinetics and thermodynamic characteristics were also discussed. The results show that when the initial concentration of phosphorus solution is 20 mg L ~ (-1) and initial pH is 6.0, the adsorption efficiency of siderite is better and the adsorption equilibrium time is 48 h. When the dosage of siderite is 0.5 ~ 10 g, the adsorption efficiency of siderite to phosphorus increases with the increase of the amount of siderite. Compared with NO-3,Cl-, SO2-4,HCO-3 has a weak inhibitory effect on phosphorus removal from siderite. The kinetic study shows that the adsorption process of phosphorus on siderite is more in accordance with the quasi-second-order kinetic model, the adsorption equilibrium can be described by Freundlich isotherm equation, and the saturated adsorption capacity is 83.5 渭 g g-1. Finally, the adsorption thermodynamic parameters at 288303 and 318K were calculated. It was found that the Gibbs free energy (螖 G) was negative, the enthalpy change (螖 H) and entropy change (螖 S) were positive, which indicated that the adsorption process was spontaneous endothermic reaction.
【作者单位】： 南京大学环境学院污染控制与资源化研究国家重点实验;
【基金】：江苏省科技厅政策引导类计划项目(No.BY2015060-05) 污染控制与资源化研究国家重点实验室开放基金~~
【分类号】：X703
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