Ultrasoundâinduced facile synthesis of spinel CoFe2O4âPAC magnetic nanocatalyst for remediation of hypersaline petrochemical wastewater: Degradation mechanism, biodegradability enhancement and phytotoxicity mitigation.
Environ Res
; 254: 118676, 2024 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-38763285
ABSTRACT
In this study, magnetic CoFe2O4-PAC nanocatalysts were synthesized through facile hydrothermal and coâprecipitation approaches with ultrasonic irradiation, which were used for the treatment of hypersaline petrochemical wastewater (HPCW). When an ultrasoundâinduced synthesis process (US@CoFe2O4âPAC) was used, a more efficient and stable magnetic spinel CoFe2O4âPAC nanocatalyst was developed. The application of this nanocatalyst as a PMS activator, not only caused eradication of 90.4% of chemical oxygen demand (COD) of a HPCW after 90 min reaction time under the optimum conditions (pH 5-6, catalyst dose 1.0 g/L and 1.0 mM PMS), but also led to marginal leaching of iron (314 µg/L) and cobalt (95 µg/L) from the nanocatalyst. Recycling experiments over five consecutive runs showed a negligible decrease (7.2%) in COD removal efficiency which proved the stability and reusability of magnetic US@CoFe2O4-PAC. Two main mechanisms of adsorption and catalytic oxidation processes (homogeneous and heterogeneous PMS) are involved simultaneously in the PMS/US@CoFe2O4-PAC system, which are responsible for the destruction of refractory contaminants of HPCW through the generation of SO4â¢â and OH⢠radicals. COD of HPCW was mainly removed through SO4â¢- radical attack (73.6%) and the biodegradability of HPCW was enhanced dramatically after 90 min reaction time. The germination index (GI) of raw HPCW was increased 17.1 ± 4.2% and 24.3 ± 8.8% after 15 and 90 min reaction time, respectively, even PMS/US@CoFe2O4-PAC system showed less impact on phytotoxicity mitigation. Hence, it can be recommended to dilute the effluent before using for irrigational purpose. The findings of this study present practical significance of spinel US@CoFe2O4-PAC, which is an environmentâfriendly catalyst, easy to handle and can sustain longâterm operation for the treatment of recalcitrant hypersaline wastewater and the other potential practical applications.
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Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
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Compostos Férricos
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Cobalto
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Águas Residuárias
Idioma:
En
Revista:
Environ Res
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Irã