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Preparation and characterization of a granular bentonite composite adsorbent and its application for Pb 2+ adsorption
Applied Clay Science ( IF 5.6 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.clay.2017.12.001
Wei Mo , Qiuzhi He , Xiujuan Su , Shaojian Ma , Jinpeng Feng , Zhenli He

Abstract Bentonite is an important clay for preparation of adsorbents for potential treatment of industrial effluents. However, due to its natural occurrence as fine particles and swelling after moisture absorption, bentonite is difficult to be separated from the liquid for regeneration purpose, which limits its application in effluent treatment. In this study, two different bentonite-polypropylene composites were synthesized, i.e., with and without pore-enlarging treatment. They both showed strong ability to resist hydraulic agitation damage with a small breakage rate in water. The obtained results from SEM and XRD characterization revealed that the compounding of bentonite with the polypropylene was a physical process, and the structural characteristics of bentonite particles were maintained in the new products. The granular composite adsorbents were effective in removing Pb2+ in aqueous solution. The suggested pore-enlarging treatment was verified as a successful operation to increase greatly the adsorption rate of contaminants on the granular bentonite composite.

中文翻译:

颗粒状膨润土复合吸附剂的制备、表征及其吸附Pb 2+ 的应用

摘要 膨润土是一种重要的粘土,可用于制备潜在处理工业废水的吸附剂。然而,膨润土由于天然存在的细小颗粒和吸湿后膨胀,很难从液体中分离出来进行再生,限制了其在污水处理中的应用。在这项研究中,合成了两种不同的膨润土-聚丙烯复合材料,即经过和不经过扩孔处理。均表现出较强的抗水力搅拌破坏能力,水中破损率小。SEM和XRD表征结果表明,膨润土与聚丙烯的复合是一个物理过程,新产品中保留了膨润土颗粒的结构特征。颗粒复合吸附剂可有效去除水溶液中的 Pb2+。所建议的孔隙扩大处理被证实是一种成功的操作,可以大大提高颗粒状膨润土复合材料上污染物的吸附率。
更新日期:2018-06-01
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