Carbon Nanotubes Hybrid Hydrogels for Environmental Remediation: Evaluation of Adsorption Efficiency under Electric Field期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Carbon Nanotubes Hybrid Hydrogels for Environmental Remediation: Evaluation of Adsorption Efficiency under Electric Field

Authors:	Giuseppe Cirillo Manuela Curcio Lorenzo Francesco Madeo Francesca Iemma Giovanni De Filpo Silke Hampel Fiore Pasquale Nicoletta

Affiliation:	1.Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende, Italy; (M.C.); (F.I.); (F.P.N.);2.Leibniz Institute of Solid State and Material Research Dresden, 01069 Dresden, Germany; (L.F.M.); (S.H.);3.Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, Italy;

Abstract:	The performance of Carbon Nanotubes hybrid hydrogels for environmental remediation was investigated using Methylene Blue (MB), Rhodamine B (RD), and Bengal Rose (BR) as model contaminating dyes. An acrylate hydrogel network with incorporated CNT was synthesized by photo-polymerization without any preliminary derivatization of CNT surface. Thermodynamics, isothermal and kinetic studies showed favorable sorption processes with the application of an external 12 V electric field found to be able to influence the amount of adsorbed dyes: stronger interactions with cationic MB molecules ( $q_{e x p}$ and $q_{e x p}^{12}$ of 19.72 and 33.45 mg g⁻¹, respectively) and reduced affinity for anionic RD ( $q_{e x p}$ and $q_{e x p}^{12}$ of 28.93 and 13.06 mg g⁻¹, respectively) and neutral BR ( $q_{e x p}$ and $q_{e x p}^{12}$ of 36.75 and 15.85 mg g⁻¹, respectively) molecules were recorded. The influence of pH variation on dyes adsorption was finally highlighted by reusability studies, with the negligible variation of adsorption capacity after five repeated sorption cycles claiming for the suitability of the proposed systems as effective sorbent for wastewater treatment.

Keywords:	wastewater treatment hybrid hydrogel carbon nanotubes isothermal studies kinetic studies

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