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CNTs coated charcoal as a hybrid composite material: Adsorption of fluoxetine probed by zebrafish embryos and its potential for environmental remediation.

Sousa-Moura, Diego, Matsubara, Elaine Yoshiko, Machado Ferraz, Irvin Bryan, Oliveira, Rhaul de, Szlachetka, ĺsis Oliveira, William da Silva, Sebastião, Camargo, Níchollas Serafim, Rosolen, José Maurício, Grisolia, Cesar Koppe, Oliveira da Rocha, Marcia Cristina
Chemosphere 2019 v.230 pp. 369-376
Danio rerio, activated carbon, adsorption, behavior change, biosensors, carbon nanotubes, charcoal, culture media, death, embryo (animal), hydrophilicity, lethal concentration 50, nanocomposites, remediation, risk, sublethal effects, toxic substances, wastewater, water pollution, water treatment
Although traditional water treatment systems can remove various substances from wastewater, these conventional systems fail to remove many chemical molecules that pose potential ecological and health risks. Carbon nanotubes (CNTs) appear attractive to adsorption of many substances, but CNTs adsorbed with toxic substances becomes a nanocomposite still more toxic. Here, we employ zebrafish embryos as biosensor to examine how a hybrid micro/nanostructured carbonaceous material (HMNC) derived from a combination of activated carbon (AC) with hydrophilic carbon nanotubes (CNTs) can remediate wastewater contaminated with the pharmaceutical fluoxetine hydrochloride (FLX). AC and HMNC are practically non-toxic to zebrafish embryos (LC50 > 1000 mg.L−1). HMNC addition to culture medium containing FLX significantly reduces sublethal effects and lethality. Interaction between FLX and HMNC involves chemical adsorption such that embryo co-exposure to HMNC adsorbed with FLX in the range of concentrations evaluated herein does not elicit any behavioral changes in zebrafish.