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首页> 外文期刊>International Journal of Electrochemical Science >Effect of ionic strength on phosphorus removal with modified sediments in lake: kinetics and equilibrium studies
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Effect of ionic strength on phosphorus removal with modified sediments in lake: kinetics and equilibrium studies

机译：离子强度对湖泊中改性沉积物除磷的影响：动力学和平衡研究

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Phosphorus concentration in lakes is difficult to lower without adding extra materials, and modifiedlake sediments have the greatest environment-friendly potential for phosphorus removal. In this study,sediment samples were collected from the outlet of Yangtze River (the world third longest river) inthe Eastern part of Dongting Lake (OS) and the river estuary into Dongting Lake (ES) andsubsequently modified with iron. Phosphorus-removal efficiency in different ionic strengths of thesediment samples were evaluated, and phosphorus sorption kinetics and isotherms were analyzed usingpseudo-first- or pseudo-second-order models and Langmuir or Freundlich models, respectively.Results indicated that the modified sediment samples (MOS and MES) had higher removal efficiency(74.9%9.2% for MOS and 58.9%8.9% for MES) for phosphorus than the raw sediment samples(26.0%4.3% for OS and 13.9%0.1% for ES) in different ionic strengths. The pseudo-second-order2 model (R >0.95) better described the sorption kinetics than the pseudo-first-order one, and the sorptioncapacities of the sediment samples were highly influenced by ionic strength, with low ionic strengthbeing favorable for phosphorus uptake. Modified Langmuir models well-described phosphorus2sorption (R = 0.9049.9996). MOS and MES had higher maximum phosphorus uptake amounts-1 (3.350 and 1.569 mg g , respectively) than the other modified phosphorus sorption materials and maythus be potential sorbents for the purification of wastewater containing phosphate.
机译：湖泊中的磷浓度很难在不添加额外物质的情况下降低，改性湖底沉积物具有最大的环保潜力。本研究是从洞庭湖（OS）东部的长江（世界第三长河）的出水口和进入洞庭湖（ES）的河口收集沉积物样品，然后用铁进行改性。评价了这些沉积物样品在不同离子强度下的除磷效率，并分别使用伪一级或伪二级模型和Langmuir或Freundlich模型对磷的吸附动力学和等温线进行了分析。结果表明，改性沉积物样品（MOS）在不同的离子强度下，比原始沉积物样品（OS的26.0％4.3％和ES的13.9％0.1％）对磷的去除效率更高（MOS的74.9％9.2％和MES的58.9％8.9％）。拟二级模型（R> 0.95）比拟一级模型更好地描述了吸附动力学，沉积物样品的吸附能力受离子强度的强烈影响，低离子强度有利于磷的吸收。修改后的Langmuir模型可以很好地描述吸附的磷（R = 0.9049.9996）。 MOS和MES具有最高的最大磷吸收量-1（分别为3.350和1.569 mg g），高于其他改性的磷吸收材料，并且可能是用于净化含磷酸盐废水的潜在吸收剂。

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