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Functional rGO aerogel as a potential adsorbent for removing hazardous hexavalent chromium: adsorption performance and mechanism

  • Jingda Chen
  • Qianwei Liang
  • Sittipranee Ploychompoo
  • Hanjin LuoEmail author
Research Article
  • 29 Downloads

Abstract

A novel functional rGO aerogel was synthesized by a facile hydrothermal method. In this process, graphene oxide (GO) was used as the precursor and oxidant to synthesize the aerogels. Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and pyrrole monomer (reducing agent) were selected to use as hole scavenger and nitrogen sources. The obtained EDTA-2Na/polypyrrole (Ppy)/rGO aerogel (EPGA) has a high adsorption capacity for Cr(VI) anions, and the maximum adsorption capacity reached 361 mg/g at 298 K at pH of 2. In addition, EPGA exhibited a good ability to selectively remove Cr(VI) anions under the effect of coexisting ions (Cl, NO3, SO42−, PO43−, Ni+, Cu2+, Zn2+, and Cd2+) and good regeneration ability. The kinetics process and adsorption isotherm can be fitted well with the pseudo-second-order kinetic model and Freundlich isotherm model, respectively. The removal mechanism involved electrostatic interaction, reduction, ion exchange, and chelation process. This work provides a simple and environmentally friendly synthetic route for EPGA, which will be a potential candidate for efficient removal Cr(VI) anions from industrial wastewater.

Keywords

Aerogel Cr(VI) Adsorption Reduction 

Notes

Funding information

This study is financially supported by the Social Development Fund of Guangdong Province (No. 2017A020216018) and Guangzhou Science and Technology Project (No. 201904010319).

Supplementary material

11356_2019_7365_MOESM1_ESM.docx (10.9 mb)
ESM 1 (DOCX 11190 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  • Jingda Chen
    • 1
    • 2
  • Qianwei Liang
    • 1
    • 2
  • Sittipranee Ploychompoo
    • 1
    • 2
  • Hanjin Luo
    • 1
    • 2
    • 3
    Email author
  1. 1.School of Environment and EnergySouth China University of TechnologyGuangzhouPeople’s Republic of China
  2. 2.The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of EducationGuangzhouPeople’s Republic of China
  3. 3.Guangdong Engineering and Technology Research Center for Environmental NanomaterialsGuangzhouPeople’s Republic of China

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