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Elimination of surfactants and small dyes from water with silica-supported dendritic amphiphiles

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Abstract

Silica-supported branched polyethylenimine (Sil@PEI) is a conventional adsorbent and shows a limited affinity to anionic surfactants and small dyes (K = 106–107 L/mol). If the PEI is alkylated with cetyl groups (C16), the K of the resulting adsorbents (Sil@PEI@C16-x, where x is the fraction of PEI units being alkylated) is significantly improved. Optimization shows that Sil@PEI@C16-0.15 can best reduce aqueous surfactants to a residue around 10−10 mol/L; while Sil@PEI@C16-0.6 can reduce even small aqueous dyes to a residue below 10−10 mol/L, nearly 105-fold lower than that by Sil@PEI. The adsorbents are well recyclable. It is believed that in the case of dyes, the dense cetyl shell can isolate the PEI from the bulky water and thus suppress the competitive binding by water; while in the case of surfactants, the semiclosed cetyl shell can simultaneously meet electrostatic complement and hydrophobic complement to the surfactants.

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Authors and Affiliations

  1. Institute of Functional Polymers, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China

    Feng Chen, De-cheng Wan  (万德成), Ming Jin & Hong-ting Pu

  2. Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, Shanghai, 201804, China

    De-cheng Wan  (万德成) & Hong-ting Pu

Authors
  1. Feng Chen
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  2. De-cheng Wan  (万德成)
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  3. Ming Jin
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  4. Hong-ting Pu
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Corresponding author

Correspondence to De-cheng Wan  (万德成).

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Chen, F., Wan, Dc., Jin, M. et al. Elimination of surfactants and small dyes from water with silica-supported dendritic amphiphiles. Chin J Polym Sci 34, 59–68 (2016). https://doi.org/10.1007/s10118-016-1728-1

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  • DOI: https://doi.org/10.1007/s10118-016-1728-1

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