Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127403
Keywords
Electro-Fenton; Microbubble; Rotating cathode; Tubular titanium cathode; Antibiotic wastewater treatment
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The microbubble-assisted rotary tubular titanium cathode (MRTTC) significantly enhanced H2O2 accumulation and Fe3+ reduction in the electro-Fenton (EF) process, leading to improved degradation of organic pollutants. The synergistic effect between the rotating and microbubble-assisted cathodes in MRTTC intensified H2O2 accumulation, while the newly formed O2-center dot provided an additional reduction pathway for Fe3+ reduction, contributing to the effectiveness of MRTTC in treating antibiotic wastewater.
To improve cathodic H2O2 accumulation and Fe3+ reduction synchronously in the electro-Fenton (EF) process, a microbubble-assisted rotary tubular titanium cathode (MRTTC) was designed for the first time. By utilizing this MRTTC, H2O2 accumulation improved by 4.05-fold, along with a 200% enhancement in iron reduction compared to the conventional EF process. This promotion is mainly attributed to a considerably higher oxygen mass transfer, which reduces the thickness of the adhered diffusion layer. The oxygen mass transfer coefficient (KLa) also improved from 0.0073 s-1 to 0.012 s-1 at a rotational speed of 300 rpm. In addition, the microbubbleassisted cathode further improved the KLa to 0.047 s-1. The synergistic effect between the rotating and microbubble-assisted cathodes further intensified H2O2 accumulation in MRTTC. Apart from H2O2 promotion, the iron reduction rate was elevated because the newly formed O2-center dot provided an additional reduction pathway for Fe3+ reduction in addition to the cathodic path. The effectiveness of MRTTC was confirmed by treating a benchmark organic pollutant, sulfamerazine (SMR), where approximately 100% SMR decay was obtained in 3 h. The results show that MRTTC is a novel and promising design in EF for antibiotic wastewater treatment.
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