Nexus between polymer support and metal oxide nanoparticles in hybrid nanosorbent materials (HNMs) for sorption/desorption of target ligands

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• 作者：Ryan C. Smith ; Jinze Li ; Surapol Padungthon…
• 关键词：ion exchange ; sorption ; arsenic ; perchlorate ; fluoride
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：9
• 期：5
• 页码：929-938
• 全文大小：1,864 KB
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• 作者单位：Ryan C. Smith (1)
  Jinze Li (1)
  Surapol Padungthon (1)
  Arup K. Sengupta (1)
  
  1. Environmental Engineering Program, Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA, 18015, USA
  
• 刊物主题：Environment, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-221X

文摘

Metal oxide nanoparticles like hydrated ferric oxide (HFO) or hydrated zirconium oxide (HZrO) are excellent sorbents for environmentally significant ligands like phosphate, arsenic, or fluoride, present at trace concentrations. Since the sorption capacity is surface dependent for HFO and HZrO, nanoscale sizes offer significant enhancement in performance. However, due to their miniscule sizes, low attrition resistance, and poor durability they are unable to be used in typical plug-flow column setups. Meanwhile ion exchange resins, which have no specific affinity toward anionic ligands, are durable and chemically stable. By impregnating metal oxide nanoparticles inside a polymer support, with or without functional groups, a hybrid nanosorbent material (HNM) can be prepared. A HNM is durable, mechanically strong, and chemically stable. The functional groups of the polymeric support will affect the overall removal efficiency of the ligands exerted by the Donnan Membrane Effect. For example, the removal of arsenic by HFO or the removal of fluoride by HZrO is enhanced by using anion exchange resins. The HNM can be precisely tuned to remove one type of contaminant over another type. Also, the physical morphology of the support material, spherical bead versus ion exchange fiber, has a significant effect on kinetics of sorption and desorption. HNMs also possess dual sorption sites and are capable of removing multiple contaminants, namely, arsenate and perchlorate, concurrently. Keywords ion exchange sorption arsenic perchlorate fluoride