Abstract
Arsanilic acid (ASA), an organic-arsenic veterinary drug used widely, has greatly attracted attention due to its potential threats. We report the nanocomposites of the α-Fe2O3 nanoparticles growth on reduced graphene oxide (rGO) by a one-pot method. The α-Fe2O3 nanoparticles are densely covered on the surface of rGO according to the observations of transmission and scanning electron microscope. The adsorptive capacity (357.4±11.2 mg g−1) of the Fe2O3@rGO nanocomposites for ASA, which was more than the sum of adsorptive capacities of the pure α-Fe2O3 nanoparticles and rGO, revealed a remarkable enhancement due to the synergetic effect of multiple interactions and the good dispersion of α-Fe2O3 nanoparticles with more active binding sites in the Fe2O3@rGO nanocomposites. The adsorption equilibrium of ASA onto the Fe2O3@rGO nanocomposites was achieved for 60 min, and the adsorption of ASA was dependent of pH and temperature, and independent of the concentration of humic acid ranging from 0 to 20 mg L−1. After five cycles of adsorption-desorption, the adsorptive amounts of ASA by the regenerative sorbent still retained 85% of adsorptive amount by the fresh sorbents. The adsorption process of ASA can be described by the Langmuir and the pseudo-second-order equations and is exothermic and spontaneous according to thermodynamic analysis.
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Financial support of this work was provided by the Science and technology development fund of Shenyang Medical College (20191026) and by scientific research foundation of education department of Liaoning province (LN201902).
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Sui, LL., Peng, LN. & Xu, HB. Nanocomposites of Fe2O3@rGO for adsorptive removal of arsanilic acid from aqueous solution. Korean J. Chem. Eng. 38, 498–504 (2021). https://doi.org/10.1007/s11814-020-0722-z
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DOI: https://doi.org/10.1007/s11814-020-0722-z