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首页> 外文期刊>RSC Advances >Removal of chromium(vi) from wastewater using weakly and strongly basic magnetic adsorbents: adsorption/desorption property and mechanism comparative studies
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Removal of chromium(vi) from wastewater using weakly and strongly basic magnetic adsorbents: adsorption/desorption property and mechanism comparative studies

机译：使用弱且强碱性磁性吸附剂从废水中除去铬（VI）：吸附/解吸性和机制比较研究

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摘要

Two novel strongly basic magnetic adsorbents, quaternary ammonium-modified polystyrene and chitosan magnetic microspheres (Pst–MIMCl and CTS–GTMAC), were prepared using the in situ coprecipitation and emulsion cross-linking methods under mild conditions, with features of strong magnetic responsiveness and high quaternary ammonium group contents. The Cr( VI ) adsorption/desorption properties and mechanisms of strongly and weakly basic magnetic adsorbents were compared through simulated wastewater. The strongly basic adsorbent exhibited low pH dependence, and the main adsorption mechanism was ion exchange. The weakly basic adsorbent exhibited high pH dependence, and the major adsorption mechanism was electrostatic attraction. Besides, the strongly basic adsorbent required higher desorption conditions than the weakly basic adsorbent owing to the difference of the desorption mechanisms. Furthermore, the removal selectivity of the strongly and weakly basic magnetic adsorbents was estimated by the chromium plating wastewater. The results demonstrated that the strongly basic magnetic adsorbents exhibited higher selectivity than the weakly basic magnetic adsorbents. In addition, the Pst–MIMCl was selected as the optimal magnetic adsorbent for Cr( VI ) recovery from wastewater, with the advantages of strongly magnetic responsiveness, wide pH applicable range, high removal efficiency, high adsorption selectivity and good reusability.
机译：使用在温和条件下的原位共沉淀和乳液交联方法制备两种新型碱性磁性吸附剂，季铵改性聚苯乙烯和壳聚糖磁性微球（PST-MIMCL和CTS-GTMAC），具有强烈的磁反应性的特征高季铵群内容物。通过模拟废水比较Cr（VI）吸附/解吸性和强烈碱性磁性吸附剂的机制。强碱性吸附剂表现出低pH依赖性，主要吸附机制是离子交换。弱碱性吸附剂表现出高pH依赖性，并且主要吸附机制是静电吸引力。此外，由于解吸机构的差异，强烈的吸附剂比弱碱性吸附剂所需更高的解吸条件。此外，铬镀废水估计了强烈且弱碱性磁性吸附剂的去除选择性。结果表明，强基本的磁性吸附剂表现出比弱碱性磁性吸附剂的选择性更高。此外，选择PST-MIMCL作为来自废水的Cr（VI）回收的最佳磁性吸附剂，具有强磁反应性，宽的pH适用范围，高去除效率，高吸附选择性以及良好的可重复使用性。

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