resumo
Porous carbon materials derived from biopolymers are attractive sorbents for the removal of emerging pollutants from water, due to their high specific surface area, high porosity, tunable surface chemistry, and reasonable cost. However, carrageenan biopolymers were scarcely investigated as a carbon source to prepare porous carbon materials. Herein, hydrochars (HCs) and porous activated carbons (ACs) derived from natural occurring polysaccharides with variable sulfate content (kappa-, iota- and lambda-carrageenan) were prepared and investigated in the uptake of ciprofloxacin, which is an antibiotic detected in water sources and that poses serious hazards to public health. The materials were prepared using hydrothermal carbonization and subsequent chemical activation with KOH to increase the available surface area. The activated carbons were markedly microporous, presenting high specific surface area, up to 2800 m(2)/g. Activated carbons derived from kappa- and lambda-carrageenan showed high adsorption capacity (422 and 459 mg/g, respectively) for ciprofloxacin and fast adsorption kinetics, reaching the sorption equilibrium in approximately 5 min. These features place the ACs investigated here among the best systems reported in the literature for the removal of ciprofloxacin from water.
palavras-chave
HOSPITAL WASTE-WATER; ACTIVATED CARBON; FLUOROQUINOLONE ANTIBIOTICS; HYDROTHERMAL SYNTHESIS; EMERGING POLLUTANTS; ADSORPTION REMOVAL; AQUEOUS-SOLUTION; PHARMACEUTICALS; SORPTION; OPTIMIZATION
categoria
Science & Technology - Other Topics; Materials Science
autores
Nogueira, J; Antonio, M; Mikhalev, SM; Fateixa, S; Trindade, T; Daniel-da-Silva, AL
nossos autores
Ana Luísa Daniel da Silva
Investigador Principal
João Nogueira
Bolseiro de investigação
Maria de Almeida Vasconcelos António
Estudante de doutoramento
Sara Fateixa
Investigador Júnior
Sergey Mikhalev
Bolseiro de pós-Doutoramento
Tito Trindade
Professor Catedráticoagradecimentos
This research was funded by Portuguese Foundation for Science and Technology-FCT (FCT Ref. UID/CTM/50011/2013) and the IF-2014 FCT investigator Programme.