| Abstrakt: |
Reactive Black 5 (RB5) is an anionic dye with an azo group and poses a severe hazard to aquatic life and the safety of the water environment. In this work, sugarcane bagasse magnetic graphene oxide (SCBMGO) nanocatalyst was prepared through a sol–gel method and used to remove RB5 through the photocatalytic process under visible-light (LED) radiation. The influences of different environmental parameters on the photocatalytic removal performance were studied. Reaction mechanism for RB5 removal was investigated with the effect of radical scavengers and analysis of intermediates. Recyclability of the SCBMGO, RB5 removal from drinking water, and toxicity was evaluated in the photocatalytic process. The maximum efficiencies were obtained as 99.99% after 120 min at pH 2, 10 mg L−1 RB5, and 0.4 g L−1 SCBMGO. With increasing all variables except the dosage of the SCBMGO, the removal efficiency of RB5 decreased. The EEO value for the LED/SCBMGO (7.5 kWh m−3) process, as an indicator of the effectiveness of the used process, demonstrated extended productiveness and dwindled electrical power fed of the used system. The total operating costs were $15 per kg of dye removal in 1 m3 of wastewater. Comparative experiments have shown that the SCBMGO/LED has the highest efficiency. SCBMGO displayed outstanding stability for 600 min. Since the scavenging action and the generation of reactive species with low oxidation potential, the presence of chloride, sulfate, nitrate, and nitrite in the drinking water slowed the removal rate of RB5. The toxicity test was performed by culturing Daphnia Magna under optimal conditions. [ABSTRACT FROM AUTHOR] |
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