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It is well-known that direct discharges of dye-contaminated wastewaters generated from various industries (i.e., textile, cosmetics and food industries,…) cause severe effects on both aquatic environment and human health. Decontamination of dye-containing wastewaters using nanomaterials-based adsorbents such as carbon nanotubes is regarded as an interesting field of investigation to control these types of pollutants. In this context, a newly prepared ferrocene-modified carbon nanotubes (amFc-MWCNTs) was applied as an adsorbent for the removal of rhodamine B (RhB) dye from aqueous solutions. The structural properties of the hybrid adsorbent were fully characterized using Raman, XPS, EDX, SEM and TEM microscopy. Adsorption isotherms and kinetics of RhB were investigated and multiple models (i.e. Langmuir, Freundlich, Hill,…) were used to fit experimental data. It was found that > 98% of RhB with initial concentration of 10 mg L −1 can be captured within 2 h when using 0.4 g L −1 of amFc-MWCNTs. The adsorption behavior of this nanomaterial fitted well with the Hill isotherm and the pseudo-second-order kinetic model. Moreover, the intra-particle diffusion was identified as the rate-limiting step of the adsorption process. After washing with acetone, regenerated amFc-MWCNTs adsorbent showed good recovery, indicating its reusability and its potential in practical applications.

A novel ferrocene-functionalized reduced graphene oxide (rGO)-based electrode is proposed. It was fabricated by the drop casting of ferrocene-functionalized graphene onto polyester substrate as the working electrode integrated within screen-printed reference and counter electrodes. The ferrocene-functionalized rGO has been fully characterized using FTIR, XPS, contact angle measurements, SEM and TEM microscopy, and cyclic voltammetry. The XPS and EDX analysis showed the presence of Fe element related to the introduced ferrocene groups, which is confirmed by a clear CV signal at ca. 0.25 V vs. Ag/AgCl (0.1 KCl). Mediated redox catalysis of H2O2 and bio-functionalization with glucose oxidase for glucose detection were achieved by the bioelectrode providing a proof for potential biosensing applications.

A melanin-like nanoparticle modified screen-printed electrode for enzyme-less detection of ascorbic acid.

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