Issue 15, 2020

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Abstract

Polypyrrole-based (PPy) composite are promising candidates for the treatment of water pollution. Adsorption selectivity as well as a large adsorption capacity are two key factors for treating wastewater containing multiple ions. The structure and morphology of the prepared composites were characterized by the FT-IR, XRD and SEM examinations. The results indicate that the Fe3O4 and PPy nanosphere coats attapulgite (ATP) closely and evenly. Herein, a novel Fe3O4 and ATP doped three-dimensional network structure PPy/Fe3O4/ATP composite was demonstrated as an excellent adsorbent to effectively remove Cr(VI). The as-synthesized PPy/Fe3O4/ATP composite is suitable for Cr(VI) adsorption in a wide pH range (pH 2–6). Up to a 96.44% removal rate was found with 400 mg L−1 Cr(VI) aqueous solution in 30 min for 0.2 g PPy/Fe3O4/ATP adsorbent. Adsorption results showed that Cr(VI) removal efficiency by PPy/Fe3O4/ATP decreased with an increase in pH. The removal rate of Cr(VI) had already reached 93.63% in 15 min contact time. Co-existing ions studies exhibit inorganic oxyacid anion and transition metal cation showed negative effects on Cr(VI) removal rate. A chemical rather than a physical adsorption occurred for these adsorbents as revealed by a pseudo-second-order kinetic study. The results of the adsorption isotherms showed that the adsorption process was similar to the Langmuir isotherm adsorption. Furthermore, the PPy/Fe3O4/ATP composite exhibited a high stability for Cr(VI) adsorption during recycling tests process. This work may provide some useful guidelines for designing adsorbents with selectivity toward specific heavy metal ions.

Graphical abstract: Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Article information

Article type
Paper
Submitted
25 okt 2019
Accepted
10 feb 2020
First published
28 feb 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 8790-8799

Insight into the synergistic effect on adsorption for Cr(VI) by a polypyrrole-based composite

W. Sun, W. Zhang, H. Li, Q. Su, P. Zhang and L. Chen, RSC Adv., 2020, 10, 8790 DOI: 10.1039/C9RA08756G

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