Accelerated Cr (VI) removal by a three-dimensional electro-Fenton system using green iron nanoparticles.

Autor: López-Campos B; Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala, Guatemala City, Guatemala., Paniagua SA; Laboratorio Nacional de Nanotecnología (LANOTEC CeNAT), Centro Nacional de Alta Tecnología, Consejo Nacional de Rectores, San José, Costa Rica., Vega-Baudrit JR; Laboratorio Nacional de Nanotecnología (LANOTEC CeNAT), Centro Nacional de Alta Tecnología, Consejo Nacional de Rectores, San José, Costa Rica.; Laboratorio de Polímeros POLIUNA, Escuela de Química, Universidad Nacional, Heredia, Costa Rica., Muñoz-Arrieta R; Centro Nacional de Innovaciones Biotecnológicas (CENIBiot), Centro Nacional de Alta Tecnología, Consejo Nacional de Rectores (CeNAT-CONARE), San José, Costa Rica., Guerrero-Gutiérrez EMA; Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala, Guatemala City, Guatemala.
Jazyk: angličtina
Zdroj: Water environment research : a research publication of the Water Environment Federation [Water Environ Res] 2024 Jan; Vol. 96 (1), pp. e10981.
DOI: 10.1002/wer.10981
Abstrakt: Green-synthesized iron nanoparticles (GAP-FeNP) were used as particle electrodes in a three-dimensional electro-Fenton (3DEF) process to accelerate the removal of hexavalent chromium [Cr (VI)]. Removal was evaluated by varying the pH (3.0, 6.0, and 9.0) and initial Cr (VI) concentrations (10, 30, and 50 mg/L) at 5 and 25 min. These results demonstrated that GAP-FeNP/3DEF treatment achieved more than 94% Cr (VI) removal under all tested conditions. Furthermore, it was observed that Cr (VI) removal exceeded 98% under pH 9.0 in all experimental parameters tested. The results of the response surface methodology (RSM) determined two optimal conditions: the first, characterized by a pH of 3.0, Cr (VI) concentration at 50 mg/L, and 25 min, yielded a Cr (VI) removal of 99.7%. The second optimal condition emerged at pH 9.0, with Cr (VI) concentrations of 10 mg/L and 5 min, achieving a Cr (VI) removal of 99.5%. This study highlights the potential of the GAP-FeNP to synergistically accelerate Cr (VI) removal by the 3DEF process, allowing faster elimination and expansion of the alkaline (pH 9.0) applicability. PRACTITIONER POINTS: The required time for >99% of Cr (VI) removal by the GAP-FeNP/3DEF process was shortened from 25 to 5 min. EF process with GAP-FeNP reduces the time necessary for Cr (VI) removal, which is 67% faster than conventional methods. EF process using GAP-FeNP removed >94% of Cr (VI) after 25 min for all initial Cr (VI) concentrations and pH treatments. Cr (VI) removal by the GAP-FeNP/3DEF process was >98% at a pH of 9.0, widening the solution pH applicability.
(© 2024 Water Environment Federation.)
Databáze: MEDLINE
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