Effective removal of Cr(VI) from solution by three-dimensional polyaniline loaded composite porous hydrogel.

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
Read Online Read More Add to Saved list
  • Additional Information
    • Abstract:
      It is still challenging to avoid polyaniline agglomeration and fabricate polyaniline-based adsorbents with stable structure, excellent adsorption performance. Herein, we synthesized montmorillonite/humic acid/polyvinyl alcohol@polyaniline (MMT/HA/PVA@PANI) composite porous hydrogel adsorbent by Pickering emulsion template-in situ chemical oxidative polymerization, and the enhancement effect of this design idea on the adsorption performance of PANI was studied with heavy metal ion hexavalent chromium Cr(VI) as the target adsorbate. The in-situ polymerization of aniline at the Pickering emulsion interface and the unique three-dimensional network structure of the hydrogel act as an effective "confinement" for the growth of the polyaniline. The porous structure of hydrogel can be used as water channel, which can accelerate the combination of adsorbate and adsorption site, and significantly improve the adsorption capacity and adsorption rate. Compared with the pure PANI (43.48 mg g−1 PANI), MMT/HA/PVA@PANI (1753.60 mg g−1 PANI) obviously had significantly higher removal efficiency, which increased the removal efficiency of Cr(VI) by about 40 times. Adsorption experiments suggest that solution pH, adsorbent dosage, contact time and initial concentration all have certain effects on adsorption performance. According to the FESEM, EDX, FTIR and XPS analysis of the materials before and after adsorption, the removal of Cr(VI) is mainly enhanced by ion exchange, electrostatic attraction and chemical reduction. In conclusion, MMT/HA/PVA@PANI adsorbent has novel design, good adsorption performance and strong stability, and it has great development prospects in removing heavy metal ions from wastewater. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)