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首页> 外文期刊>Journal of Polymers and the Environment >Removal of Lead from Aqueous Solutions by Polyethylene Waste/Nano-manganese Dioxide Composite
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Removal of Lead from Aqueous Solutions by Polyethylene Waste/Nano-manganese Dioxide Composite

机译：聚乙烯废料/纳米二氧化锰复合材料从水溶液中去除铅

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摘要

An adsorbent composite based on waste polyethylene and manganese dioxide was synthesized, characterized and its capacity to remove Pb2+ from solutions was investigated. Chemical activation of PE bags was achieved by the reaction with potassium permanganate. This was to increase their susceptibility toward photo-degradation and thermal degradation by the introduction of functional groups, such as hydroxyl and carboxyl groups, as evident from the new IR bands appeared at 3400, 1710, and 1630 cm(-1). Further, the composite was fabricated by thermal or chemical dissociation of potassium permanganate, and its structure was confirmed by FTIR, XRD and SEM. Nano-structure manganese dioxide in the amorphous phase was identified. The adsorption results confirmed that the prepared adsorbent can effectively remove Pb2+ ions from aqueous solutions, with a maximum adsorption capacity of 50.5 mg g(-1). Both intra-particle diffusion and film diffusion contribute to the rate-determining step in the adsorption process. The composite can be regenerated using HCl solution (0.5 mol L-1) with Pb2+ recovery percentage reached 95 %. After serving as a promising absorbent for Pb2+, manganese oxide can be removed by hydrolysis with acid (6.0 M HCl) and the polymer with enhanced susceptibility toward degradation can be disposed off.
机译：合成了一种基于废聚乙烯和二氧化锰的吸附剂复合材料，对其进行了表征，并研究了其从溶液中去除Pb2 +的能力。 PE袋的化学活化是通过与高锰酸钾反应实现的。这是通过引入官能团（例如羟基和羧基）来增加其对光降解和热降解的敏感性，从3400、1710和1630 cm（-1）处出现的新IR波段可以明显看出。此外，通过高锰酸钾的热解或化学解离制备复合材料，并通过FTIR，XRD和SEM确认其结构。鉴定出无定形相中的纳米结构二氧化锰。吸附结果证实，所制备的吸附剂可以有效去除水溶液中的Pb2 +离子，最大吸附量为50.5 mg g（-1）。颗粒内扩散和膜扩散都有助于吸附过程中的速率确定步骤。可以使用HCl溶液（0.5 mol L-1）再生复合物，Pb2 +的回收率达到95％。用作有希望的Pb2 +吸收剂后，可以通过用酸（6.0 M HCl）水解除去氧化锰，并可以除去对降解敏感性较高的聚合物。

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