A novel utilization of raw sepiolite: preparation of magnetic adsorbent directly based on sol–gel for adsorption of Pb(II)

Jiang, Xu; He, Jiping; Zhu, Lin; Guo, Shulian; Chen, Hao

doi:10.1007/s11356-022-21182-1

Cited by 6 publications

(1 citation statement)

References 46 publications

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“…has great advantages in stabilizing Pickering emulsion. As a typical clay material, sepiolite is negatively charged (because Si 4+ is replaced by other cations), which has a wide range of sources, high speci c surface area and good adsorption capacity, so it is widely used to remove Cr(VI) ions from wastewater(Chen et al, 2014a;Xie et al, 2021;Xu et al, 2022).…”

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Sorption enhancement of Cr(VI) from aqueous solution by polyaniline confined in three-dimensional network of composite porous hydrogel

Zhang

Zou

et al. 2023

Environ Sci Pollut Res

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Hexavalent chromium Cr(VI) is a typical harmful pollutant, which is carcinogenic or mutagenic to aquatic animals and humans. In this study, sepiolite/humic acid/polyvinyl alcohol@ polyaniline (SC/HA/PVA@PANI) composite porous hydrogel adsorbent was synthesized by Pickering emulsion template-in situ chemical oxidative polymerization for adsorption of Cr(VI) from aqueous solution. The insitu polymerization of aniline at the Pickering emulsion interface and the unique three-dimensional network structure of the hydrogel act as an effective "con nement" for the growth of the polymer. The porous structure of the material acts as a water channel, which effectively accelerates the binding of the adsorbate to the adsorption sites, and signi cantly improves the adsorption rate and adsorption capacity.The adsorption capacity of PANI for Cr(VI) con ned in three-dimensional network of composite porous SC/HA/PVA@PANI hydrogel reached 1180.97 mg/g-PANI, which increased about 27-fold compared the adsorption capacity of pure PANI (43.48 mg/g). It is shown that the experimental design effectively avoids the agglomeration of PANI and improves its potential adsorption performance. In addition, the analysis of FESEM-EDX, FT-IR and XPS spectra before and after adsorption con rmed that the main adsorption mechanisms of Cr(VI) on SC/HA/PVA@PANI included ion exchange, electrostatic attraction and redox reaction. In conclusion, SC/HA/PVA@PANI has good stability and excellent adsorption performance, which is a new type of Cr(VI) ion adsorbent with great potential. HighlightsA novel porous hydrogel adsorbent SC/HA/PVA@PANI was prepared for Cr(VI) removal.The in-situ polymerization of aniline on the Pickering emulsion interface and the "con nement" effect of the hydrogel's unique three-dimensional network structure on the polymer can effectively avoid the agglomeration of polyaniline and exert its potential adsorption e ciency.The porous structure of the material acts as a water channel, which effectively accelerates the combination of the adsorbate and adsorption site to improve the adsorption rate and capacity. The adsorption mechanism of Cr(VI) mainly includes electrostatic action, chemical reduction and ion exchange.

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confidence: 99%