Competitive removal of phenolic mixtures from aqueous solutions using a Polyaniline-Coated Maghemite-Graphene nanoplatelet composite

초록

Phenolic compounds are categorized as endocrine disruptors that interfere with hormonal systems and pollute water bodies, environmental contamination from these compounds especially those generated by the chemical industry poses a serious worldwide concern. Using a two-stage oxidation polymerization process, a new Fe3O4GnP-PANI magnetic composite was effectively created in this work for effective phenolic chemical adsorption. The charecterization techniques confirms the intraction of Fe3O4-GnP and coatingof polyaniline. In addition to facilitating magnetic separation, the addition of graphene nanoplatelets (GnP) and polyaniline (PANI) improved the material's specific surface area, functional group distribution, and aromatization with a maximum capacity of 132.3 mg g- 1 for phenolic mixtures at pH 7, the composite showed impressive adsorption capacities of 17.01 mg g- 1, 46.48 mg g- 1, and 73.84 mg g- 1 for bisphenol A (BPA), 1-naphthol, and 2-naphthol, respectively, under neutral pH. In accordance with the pseudo-first-order kinetic model and Langmuir isotherm, adsorption processes comprised electrostatic attraction, it-it interactions, and hydrogen bonding, suggesting spontaneous and endothermic adsorption. Excellent reusability, stability in removal efficiency, and a 97.8 % desorption ratio after ten cycles were all shown by the composite, which also demonstrated resistance to interference from ionic strength. These findings demonstrate that FeO4-GnP-PANI is a very efficient, long-lasting, and quick adsorbent for eliminating organic contaminants from water, providing a potential remedy for problems with environmental pollution.

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