Polyethylenimine facilitated ethyl cellulose for hexavalent chromium removal with a wide pH range

Bin Qiu, Jiang Guo, Xi Zhang, Dezhi Sun, Hongbo Gu, Qiang Wang, Huanwen Wang, Xuefeng Wang, Xin Zhang, Brandon L. Weeks, Zhanhu Guo, Suying Wei

Research output: Contribution to journalArticle

107 Scopus citations

Abstract

Ethyl cellulose (EC) composites modified with 20.0 wt % polyethylenimine (PEI) (PEI/ECs) demonstrated effective hexavalent chromium, [Cr(VI)], removal from solutions with a wide pH range. For example, 4.0 mg/L Cr(VI) solution with a pH below 3.0 was completely purified by 3.0 g/L PEI/ECs within 5 min, much faster than the as-received EC (2 h) and activated carbon (several hours). These PEI/ECs adsorbents has overcome the low pH limitation of Cr(VI) removal; for example, 4.0 mg/L Cr(VI) solution with a pH of 11.0 was completely purified within 15 min. These adsorbents followed chemical adsorption as revealed from the pseudo-second-order kinetic study. These PEI/ECs following the isotherm Langmuir model have a maximum adsorption capacity of 36.8 mg/g, much higher than pure EC (12 mg/g), tetrabutylammonium-modified celluloses (16.67 mg/g), and magnetic carbon (16 mg/g). The reduction of Cr(VI) to Cr(III) by the oxidation of amine groups and hydroxyl groups of PEI/ECs was verified as the main mechanism for the Cr(VI) removal. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)19816-19824
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number22
DOIs
StatePublished - Nov 26 2014

Keywords

  • Adsorption
  • Cr(VI) removal
  • Ethyl cellulose (EC)
  • Kinetics
  • Polyethylenimine (PEI)
  • Redox reaction

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    Qiu, B., Guo, J., Zhang, X., Sun, D., Gu, H., Wang, Q., Wang, H., Wang, X., Zhang, X., Weeks, B. L., Guo, Z., & Wei, S. (2014). Polyethylenimine facilitated ethyl cellulose for hexavalent chromium removal with a wide pH range. ACS Applied Materials and Interfaces, 6(22), 19816-19824. https://doi.org/10.1021/am505170j