Magnetic poly(aniline-co-5-sulfo-2-anisidine) as multifunctional adsorbent for highly effective co-removal of aqueous Cr(VI) and 2,4-Dichlophenol
- Publisher:
- ELSEVIER SCIENCE SA
- Publication Type:
- Journal Article
- Citation:
- Chemical Engineering Journal, 2020, 387
- Issue Date:
- 2020-05-01
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| 1-s2.0-S1385894720301431-main.pdf | Published version | 6.94 MB |
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© 2020 Elsevier B.V. The common coexistence of heavy metal ions (HMIs) and toxic organic matters (OMs) arouses public concerns for their combined toxicity and carcinogenicity. The magnetic poly[aniline(AN)-co-5-sulfo-2-anisidine(SA)] (AN-SA/Fe3O4) was synthesized by an oxidative copolymerization method for the highly-effectively simultaneous removal of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) from aqueous solution. The novel adsorbent exhibited ultra-strong adsorption capacities for sole Cr(VI) and sole 2,4-DCP. The mechanism studies revealed that Cr(VI) species (HCrO4− and Cr2O72− in solution pH as 5) were reduced to Cr(III) by the –NH–/–NH2 groups after attaching to the protonated binding sites of AN-SA/Fe3O4 through electrostatic attraction. By contrast, multiple reactions involving the n-π electron donor-acceptor (EDA) interaction, π-π stacking and hydrogen bond contributed to the elimination of 2,4-DCP. In binary system, the coexistent Cr(VI) and 2,4-DCP elevated mutual adsorption capacities by 88.1% and 102.1%, respectively. Specially, 2,4-DCP can form bridge interactions with both Cr(VI) and Cr(III) due to conjugate effect. This property enabled Cr(VI) to additionally link to the hydrophobic sites, except for the hydrophilic sites, via 2,4-DCP bridges. Moreover, the produced Cr(III) can forcefully captured 2,4-DCP with the electron-rich groups (i.e., [sbnd]NH[sbnd], [sbnd]N[dbnd], [sbnd]SO3H, [sbnd]OCH3) on AN-SA/Fe3O4 to form the multi-components complexes. The bridge interactions (i.e., n-π EDA interaction, complexation) created the newly available sites for Cr(VI) and 2,4-DCP, resulting in enlarged adsorbance and synchronous removal on AN-SA/Fe3O4 in coexisting system. In addition, the high proportion of [sbnd]N[dbnd] groups generated by Cr(VI) oxidation also devoted to the uptake enhancement due to its strong affinity for 2,4-DCP. Overall, the high-performance and synergistic removal qualified AN-SA/Fe3O4 as a multifunctional adsorbent for the integrated treatment of HIMs-OMs hybrid pollutants.
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