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首页> 外文期刊>International Journal of Environmental Chemistry >Removal of Heavy Metals from Their Solution Using Polystyrene Adsorbent (Foil Take-Away Disposable Plates)
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Removal of Heavy Metals from Their Solution Using Polystyrene Adsorbent (Foil Take-Away Disposable Plates)

机译：使用聚苯乙烯吸附剂（铝箔一次性板）从其溶液中去除重金属

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The presence of heavy metal ions, viz. Cr(vi), Mn(ii) and Cu(ii), in aquatic systems pose heavy risks to human health. Therefore, removal of such metal ions from water bodies may be considered an interesting and important research activity. This is a research work on the removal of heavy metals from their solution with the use of polystyrene. Polystyrene (Foil take-away disposable plates) was sourced locally. The Plates were ground to fine particles to increase the surface area for adsorption and then serial dilution was performed. The adsorption isotherm models used were Langmuir, Freundlich and Dubinin-Radushkevich (DR). The result from the models showed that Langmuir fits better for Cr(vi) and Cu(ii) while DR fits in better for Mn(ii). Results obtained showed that adsorption followed second order kinetics. Equilibrium was obtained at 30 minutes. Thermodynamic data for enthalpy (ΔH) for Cr, Cu, and Mn are 2036.986 J/mol, 24276.88 J/mol and 27469 J/mol respectively and showed that adsorption was found to be endothermic. Entropy results were -49.21888 J/K, -117.97566 J/K and 66.7828 J/K for Cr(vi), Cu(ii) and Mn(ii) respectively, showing a decrease in entropy. Free energy change showed that adsorption for Chromium and Manganese at temperatures 323, 343 and 363K were spontaneous, while Copper was non spontaneous. pH result showed maximum adsorption at pH of 6. This study showed that polystyrene fits better for the adsorption of Chromium and Copper ion in the Langmuir Isotherm model. While that of Manganese was described better by the Dubinin-Radushkevich Isotherm Model. It is hereby recommended that polystyrene wastes are good adsorbents for the removal of heavy metals from aqueous solutions. Therefore, should be employed for the removal of heavy metals in the environment, as it can be easily gotten even at a low cost.
机译：重金属离子的存在，即。水生系统中的Cr（vi），Mn（ii）和Cu（ii）对人类健康构成重大风险。因此，从水体中除去这种金属离子可能被认为是有趣而重要的研究活动。这是一项使用聚苯乙烯从溶液中去除重金属的研究工作。聚苯乙烯（铝箔外卖一次性盘子）本地采购。将板研磨成细颗粒以增加吸附的表面积，然后进行系列稀释。使用的吸附等温线模型是Langmuir，Freundlich和Dubinin-Radushkevich（DR）。模型的结果表明，Langmuir更适合Cr（vi）和Cu（ii），而DR更适合Mn（ii）。所得结果表明吸附遵循二级动力学。在30分钟时达到平衡。 Cr，Cu和Mn的焓热力学数据（ΔH）分别为2036.986 J / mol，24276.88 J / mol和27469 J / mol，表明吸附是吸热的。 Cr（vi），Cu（ii）和Mn（ii）的熵结果分别为-49.21888 J / K，-117.97566 J / K和66.7828 J / K，显示熵降低。自由能变化表明，在323、343和363K温度下铬和锰的吸附是自发的，而铜不是自发的。 pH结果显示在pH为6时最大吸附。这项研究表明，聚苯乙烯在Langmuir等温线模型中更适合铬和铜离子的吸附。 Dubinin-Radushkevich等温模型更好地描述了锰。因此，建议聚苯乙烯废料是从水溶液中去除重金属的良好吸附剂。因此，应该采用这种方法去除环境中的重金属，因为即使以低成本也很容易获得。

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