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Start date: 2020Subject: search.filters.subject.Degradation

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Now showing 1 - 3 of 3
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    PublicationOpen Access
    ZIF-8 confined carbon dots/bilirubin oxidase on microalgal cells to boost oxygen reduction reaction in photo-biocatalytic fuel cells for pollutants removal
    (Elsevier B.V., 2026-01) Qing, S; Lu, X; Jiang, Y; Thambiliyagodage, C; Song, B; Xia, A; Zhang, J.R; Zhu, W; Jiang, L.P; Wu, X
    Photocatalytic fuel cells provide promising opportunities for sustainable wastewater treatment and energy conversion. However, their applications are challenged by the sluggish oxygen reducton reaction (ORR) kinetics at cathodes owning to the low O2 solubility and diffusion rate. Herein, we proposed a photo-biocatalytic fuel cell (PBFC) with a novel hybrid biocathode based on artificially engineered algal cells coated by ZIF-8 confined carbon dots/bilirubin oxidase (ZIF-8/CDs/BOD@algae). Microalgae absorbed CO2 and provided O2 in situ for BOD catalysts. Due to effective absorption of O2 by imidazole and confinement of hydrophobic porous ZIF-8, oxygen diffusion has been accelerated in MOF/enzyme systems. Importantly, the introduction of CDs alleviated the poor conductivity of ZIF-8 and improved the electron transfer rate of BOD. Thus, the biocathode exhibited a high current density of 1767 μA/cm2, a 2.26-fold increase compared with that of CDs/BOD/algae biocathode. Also, it displayed enduring operational stability for up to 60 h since the firmly wrapped ZIF-8 shells could encapsulate proteins and protect algae from the external stimulation. When coupled with Mo:BiVO4 photoanodes, the PBFC exhibited a remarkable power output of 131.8 μW/cm2 using tetracycline hydrochloride (TCH) as a fuel and an increased degradation rate of TCH. Therefore, this work not only establishs an effective confinement strategy for enzyme to enrich oxygen, but also unveils new possibilities for modified microalgal cells aiding photoelectrocatalytic systems to recover energy from wastewater treatment.
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    PublicationOpen Access
    Methyl Orange Degradation by Green Synthesized Iron Oxide Nanoparticles by Syzygium aromaticum
    (Faculty of Humanities and Sciences, SLIIT, 2023-11-01) Gaminda, K.A.P; Abeysinghe, T; Jayasinghe, C; Senthilnithy, R
    Water contamination due to textile dyes is considered carcinogenic to the environment and living organisms. Many textile dyes resist degradation, and the degradation by-products of the textile dye cause severe effects on the ecosystems. Iron oxide nanoparticles were synthesized using Syzygium aromaticum extract to address this issue. Herein, the azo dye methyl orange (MO) degradation by the green synthesized iron oxide nanoparticles (GINPs) was investigated. The synthesized GINPs were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier-Transform Infrared (FT-IR) spectroscopy. The results showed a successful synthesis and fabrication of GINPs by the S. aromaticum extract with the size ranging from nano to micro-region. A 100 ppm of MO was degraded up to 43 ppm in the first 20 min and reached equilibrium at 120 min, and the dye was degraded up to 40 ppm by the GINPs. At the equilibrium stage, 50 % of MO was degraded with a dosage (~20 ± 1 mg) of the GINPs, indicating the capability of GINPs in MO degradation compared to chemically synthesized zero-valent iron nanoparticles (CINPs).
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    PublicationEmbargo
    Effect of Co-pollutants on the Photocatalytic Activity of Fe doped ZnO Nanoparticles on the Degradation of Methylene Blue
    (IEEE, 2022-07-18) Thambiliyagodage, C; Lokuge, N
    ZnO nanoparticles and Fe doped ZnO nanoparticles with varying Fe concentrations as 0.025, 0.05, 0.075, and 0.1% respective to Zn, was successfully synthesized by the sol-gel method. Synthesized nanoparticles were characterized by X-ray diffractometry (XRD) and Raman spectroscopy. As revealed by both studies Fe has successfully doped to ZnO without causing any lattice distortions. Synthesized catalysts were photocatalytically active in degrading methylene blue under sunlight. The effect of co-pollutants; Rhodamine B, Pb 2+ , PO43− and S2O32− on the rate of photodegradation was studied and it was found that Rhodamine B, Pb 2+ , and PO43− reduce the rate and S2O32− increases the rate of photodegradation.