UV–LED driven photodegradation of organic dye and antibiotic using strontium titanate nanostructures

Thinley, Tenzin; Yashas, Shivamurthy Ravindra; Anilkumar, Kotermane Mallikarjunappa; Shivaraju, Harikaranahalli Puttaiah

doi:10.1007/s10854-021-06609-8

Cited by 16 publications

(5 citation statements)

References 47 publications

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“…This observation is well supported for the reason that when the catalyst load is high, the amount of photon absorbing on the catalyst surface increases, thus increasing the photocatalytic activity (Zhang et al 2020). But, increasing the dosage of the catalyst beyond the optimum range can result in restriction of incident light due to high turbidity eventually reducing the photocatalytic activity (Yashas et al 2021;Tenzin et al 2021). The kinetic study revealed the reactions follow the pseudo-first-order kinetics with the highest rate reaction constant of 0.088 min -1 for 40 mg catalytic dosage (R 2 = 0.971).…”

Section: Effect Of Catalyst Dosagementioning

confidence: 78%

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Degradation of doxycycline antibiotics using lanthanum copper oxide microspheres under simulated sunlight

Prabagar

Yashas

Gurupadayya

et al. 2022

Environ Sci Pollut Res

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In this study, lanthanum copper oxide was synthesised under hydrothermal techniques and characterized for doxycycline degradation. The catalyst exhibited enhanced photocatalytic doxycycline degradation under visible light owing to its compatible bandgap energy (1.7 eV). The XRD data revealed high crystallinity of the material with no noticeable impurities. Three-dimensional microspheres of varying sizes (average diameter of 2.52μm) were observed from SEM. EDX confirms the successful synthesis of La2CuO4. The effect of DC concentration, catalyst dosage and initial pH on the degradation rate of DC was studied methodically. Interestingly, about 85% of doxycycline (10 mg/L) was degraded within 120 minutes of light emitting diode irradiation at pH 10. Oxygen vacancies and surface defects were determined through photoluminescence spectra. The recyclability experiments suggested that the catalyst is capable of degrading DC for three consecutive runs. Radical trapping trials suggested that holes (h + ), superoxide radicals ( • O2 -) and hydroxyl radicals ( • OH) are involved in the photodegradation of DC. Herein, the novel approach of La2CuO4 synthesis and the efficient visible-light harvesting capability of as-prepared catalyst reveals the potentiality for DC degradation thereby opening a new horizon of research employing La2CuO4 used for various environmental applications.

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Section: Effect Of Catalyst Dosagementioning

confidence: 78%

“…0.22 μm syringe filter with a 13 mm diameter was used to remove the catalyst from the aliquots. The absorbance spectra were recorded at 300-400 nm range and by using Eq (1) the degradation percentage of DC was determined (Tenzin et al 2021).…”

Section: Photocatalytic Degradation Of DCmentioning

confidence: 99%

Degradation of doxycycline antibiotics using lanthanum copper oxide microspheres under simulated sunlight

Prabagar

Yashas

Gurupadayya

et al. 2022

Environ Sci Pollut Res

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“…The XRD analysis also showed that NiO‐doped Co nanoparticles had smaller grain sizes than undoped NiO nanoparticles, with an average size of 26 nm. Adding cobalt ions resulted in broader Bragg's peak positions and increased peak intensity [35–40]. The formation of new peak positions such as (100), (232), and (103) indicated the presence of face‐centered cubic phases in the NiO‐doped Co nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO‐doped Co nanocomposites

Venkatachalapathy,

Sambathkumar,

Rajasaravanan

et al. 2024

Luminescence

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In this study, we synthesize nanostructured nickel oxide (NiO) and doped cobalt (Co) by combining nickel(II) chloride hexahydrate (NiCl2.6H2O) and sodium hydroxide (NaOH) as initial substances. We analyzed the characteristics of the product nanostructures, including their structure, optical properties, and magnetic properties, using various techniques such as x‐ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet absorption spectroscopy (UV–Vis), Fourier transform infrared (FTIR) spectroscopy, and vibrating sample magnetometers (VSM). The NiO nanoparticles doped with Co showed photocatalytic activity in degrading methylene blue (MB) dye in aqueous solutions. We calculated the degradation efficiencies by analyzing the UV–Vis absorption spectra at the dye's absorption wavelength of 664 nm. It was observed that the NiO‐doped Co nanoparticles facilitated enhanced recombination and migration of active elements, which led to more effective degradation of organic dyes during photocatalysis. We also assessed the electrochemical properties of the materials using cyclic voltammetry (CV) and impedance spectroscopy in a 1 mol% NaOH solution. The NiO‐modified electrode exhibited poor voltammogram performance due to insufficient contact between nanoparticles and the electrolyte solution. In contrast, the uncapped NiO's oxidation and reduction cyclic voltammograms displayed redox peaks at 0.36 and 0.30 V, respectively.

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“…pH is a crucial factor in photocatalytic degradation of various pollutants in waste water. Because it significantly affects interfacial processes, both anodic and cathodic, by altering the charge generated on the catalyst surface 88 , 89 . So, it is essential to examine the dye degradation performance across different pH values.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of SrTiO3 anchored rGO/g-C3N4 photocatalyst for the removal of mixed dye from wastewater: dual photocatalytic mechanism

Gopal,

Palanisamy,

Lee

et al. 2024

Sci Rep

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A metal-free combination of rGO/g-C3N4-coupled SrTiO3 (SRN) ternary nanocomposite prepared via a wet impregnation method for UV–Vis light photocatalytic applications. Various physicochemical properties of the samples were investigated by several spectroscopic techniques including X-ray diffraction (XRD), FT-IR, Raman, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy (FE-SEM-EDX), high-resolution transmission electron microscopy (HR-TEM), UV–Vis, photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analysis. The data suggest agglomerated SRT nanoparticles are dispersed and distributed throughout the surface of the rGO sheets and GCN nanostructures. The photocatalytic performance of the SRN towards combined mixed dye and its degradation activities were evaluated towards the most common industrial effluents, Rhodamine B (RhB) and Methylene blue (MB), under UV–Vis light illumination. The results revealed that the degradation efficiency of the SRN photocatalyst shows excellent performance compared with that of the binary composition and the pure SrTiO3 (SRT) sample. The reaction rate constant for RhB was estimated to be 0.0039 min−1 and for MB to be 0.0316 min−1, which are 3.26 (RhB) and 4.21 (MB) times faster than the pure SRT sample. The enhanced degradation efficiency was attained not only by interfacial formation but also by the speedy transportation of electrons across the heterojunction. After 5 runs of the photocatalytic recylic process, the SRN photocatalyst exhibited ultimate stability without structural changes, and no noticeable degradation was observed. The outcomes of the ternary SRN nanocomposite manifest a dual photocatalytic scheme, the photocatalytic enrichment could be caused by the Z-scheme charge transfer process between GCN, SRT, and rGO nanocomposite, which helps effectual charge separation and keeps a high redox potential. From the results, SRN sample provides insight into the integration of an effective and potential photocatalyst for wastewater treatment toward real-time environmental remediation applications.

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UV–LED driven photodegradation of organic dye and antibiotic using strontium titanate nanostructures

Cited by 16 publications

References 47 publications

Degradation of doxycycline antibiotics using lanthanum copper oxide microspheres under simulated sunlight

Degradation of doxycycline antibiotics using lanthanum copper oxide microspheres under simulated sunlight

Enhanced photocatalytic and electrochemical performance of hydrothermally prepared NiO‐doped Co nanocomposites

Fabrication of SrTiO3 anchored rGO/g-C3N4 photocatalyst for the removal of mixed dye from wastewater: dual photocatalytic mechanism

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