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

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Abstract

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.

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse; School of the Environment, Nanjing University, Nanjing, 210023, China

    Guangze Nie, Jing Wang, Bingcai Pan & Lu Lv

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  1. Guangze Nie
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  2. Jing Wang
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  3. Bingcai Pan
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  4. Lu Lv
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Correspondence to Bingcai Pan.

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Nie, G., Wang, J., Pan, B. et al. Surface chemistry of polymer-supported nano-hydrated ferric oxide for arsenic removal: effect of host pore structure. Sci. China Chem. 58, 722–730 (2015). https://doi.org/10.1007/s11426-014-5285-6

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  • DOI: https://doi.org/10.1007/s11426-014-5285-6

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