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首页> 外文期刊>Separation and Purification Technology >Removal-concentration of pollutant metal-ions by water-soluble polymers in conjunction with double emulsion systems: A new hybrid method of membrane-based separation
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Removal-concentration of pollutant metal-ions by water-soluble polymers in conjunction with double emulsion systems: A new hybrid method of membrane-based separation

机译：水溶性聚合物与双乳液系统结合去除污染物中的金属离子：基于膜的分离的新混合方法

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摘要

The effect of reverse emulsion globules stabilized by non-ionic surfactants on metal-ion retention properties of poly(acrylic acid) was studied by continuous enrichment of external aqueous phase in a dead-end filtration system. Double emulsion systems were made by two-steps method confining an acid solution at pH 1.0 in the inside of reverse emulsion. Continuous phase of second dispersion stage was a poly(acrylic acid) solution at pH 6.0. By application of pressure, a divalent metal-ion stream, Cu~(2+) and Cd~(2+) at pH 6.0 was continuously added from a reservoir. Results indicate that it is possible to increase the maximum retention capacity of retention system above maximum retention capacity of poly(acrylic acid). The increase in the metal-ion retention can be explained via the macromolecular transport of metal-ions through oil phase of double emulsion. In general, a sequence given by linking of metal-ions by the polymer, adsorption of polymer on liquid-liquid interface, transporting of metal-ion and functional group regeneration is suggested and associated to the increases of overall system retention. Combination of water-soluble polymer and double emulsion systems appears as a novel alternative to remove and concentrate pollutant metal-ions in aqueous solution.
机译：通过在死端过滤系统中连续富集外部水相，研究了非离子表面活性剂稳定的反向乳液小球对聚丙烯酸的金属离子保留性能的影响。通过两步法制得双乳液体系，将酸性溶液限制在反相乳液内部的pH值为1.0的溶液中。第二分散阶段的连续相是pH 6.0的聚（丙烯酸）溶液。通过施加压力，从储器中连续添加二价金属离子流，pH 6.0的Cu〜（2+）和Cd〜（2+）。结果表明，可以将保留系统的最大保留容量提高到聚丙烯酸最大保留容量以上。金属离子保留的增加可以通过金属离子通过双乳液的油相的大分子传输来解释。通常，提出了通过聚合物连接金属离子，聚合物在液-液界面上的吸附，金属离子的运输和官能团再生所给出的顺序，并与整个系统保留的增加有关。水溶性聚合物和双重乳液体系的结合作为去除和浓缩水溶液中污染物金属离子的一种新的替代方法出现。

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