Surface chemistry of polymer-supported nano-hydrated ferric oxide for arsenic removal: effect of host pore structure

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• 作者：Guangze Nie (1)
  Jing Wang (1)
  Bingcai Pan (1)
  Lu Lv (1)
  
  1. State Key Laboratory of Pollution Control and Resource Reuse ; School of the Environment ; Nanjing University ; Nanjing ; 210023 ; China
  
• 关键词：hydrated ferric oxide ; arsenic adsorption ; nanocomposite ; surface chemistry
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：58
• 期：4
• 页码：722-730
• 全文大小：1,471 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Chemistry
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1870

文摘

Immobilization of hydrous ferric oxide (HFO) particles inside solid hosts of porous structure is an important approach to improve their applicability in advanced water treatment such as arsenic and heavy metal removal. Here, we fabricated three polystyrene (PS)-based nano-HFOs and explored the effect of host pore structure on the surface chemistry of the immobilized HFOs. Potentiometric titration of the hybrids and surface complexation modeling of their adsorption towards arsenite and arsenate were performed to evaluate the surface chemistry variation of the loaded HFOs. Polymer hosts of higher surface area and narrower pore size would result in smaller particle size of HFOs and lower the value of the point of zero charge. Also, the site density (normalized by Fe mass) and the deprotonation constants of the loaded HFOs increased with the decreasing host pore size. Arsenite adsorption did not change the surface charge of the loaded HFOs, whereas arsenate adsorption accompanied more of the negative surface charges. Adsorption affinity of both arsenic species with three HFO hybrids were compared in terms of the intrinsic surface complexation constants optimized based on the adsorption edges. HFO loaded in polystyrene host of smaller pore size exhibits stronger affinity with arsenic species.