Photocatalytic degradation of diclofenac using TiO2-CdS heterojunction catalysts under visible light irradiation

Elangovan, M.; Bharathaiyengar, Saidutta Malur; PonnanEttiyappan, JagadeeshBabu

doi:10.1007/s11356-020-11538-w

Cited by 39 publications

(13 citation statements)

References 76 publications

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“…Higher concentrations of • OH radicals present in the photocatalytic reactors result in faster DIC degradation as they are the main pathway of oxidizing/degrading organic pollutants. Our findings are in agreement with Elangovan et al [34] who studied effect of different scavengers (potassium iodide (KI), methanol and sodium azide (NaN 3 )), and concluded that photocatalytic efficiency was significantly reduced with the addition of 0.01 M KI or 10% methanol (scavengers for both h + and • OH radicals) to 100 mL of DIC solution (C 0 = 20 mg/L), indicating that hydroxyl radicals are the primary active species in photocatalytic degradation of DIC. Furthermore, we could speculate that under the experimental conditions, the surface of the TiO 2 nanotubes (TNT) is positively charged which allows one of the oxygen atoms of the carbonyl group of DIC to chemisorb on the TNT surface.…”

Section: Photocataltic Activitysupporting

confidence: 94%

“…They showed the molecularly imprinted TiO 2 had larger adsorption capacity, better selectivity and higher photodegradation performance for diclofenac than non-imprinted TiO 2 . Elangovan et al [34] prepared TiO 2 -CdS heterojunction photocatalysts using hydrothermal synthesis and showed complete photodegradation of DIC within 4 h of irradiation. Mugunthan et al [35] synthesized TiO 2 -SnO 2 mixed-oxide catalysts and showed effective complete mineralization of DIC with a maximum TOC removal of 90% achieved under ultraviolet irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

et al. 2021

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A novel low-cost synthesis of barium-modified TiO2 nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH)2 spin coated on top of TNT. Three different concentrations of Ba(OH)2 were used (12.5 mM, 25 mM and 50 mM). The crystalline structure, morphology and presence of Ba were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Ba-modified TiO2 nanotubes (BTNT) were tested for photocatalytic degradation of diclofenac under UV/Vis radiation and it was proven that all of the Ba-modified samples showed an increase in photocatalytic activity with respect to the unmodified TNTs. The most efficient photocatalyst was the sample prepared with 25 mM Ba(OH)2 which showed 90% diclofenac degradation after 60 min. This result was in agreement with cyclic voltammetry measurements that showed the largest increase in photo-oxidation current densities for the same sample due to the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation.

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Section: Photocataltic Activitysupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

et al. 2021

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“…In comparison with bare TNTA, the light absorbance edge of TNTA-CdS-1, TNTA-CdS-2, and TNTA-CdS-3 photocatalyst were significantly red-shifted to the visible region (Figure 3). This is possibly due to the decorating of CdS on TNTA, which has been reported to improve the visible light capability of TNTA-CdS (Elangovan et al, 2021;Li et al, 2015). By extrapolating the Tauc plot of the transformation of Kubelka-Munk [F(R).hv] 1/2 vs energy (hv) in the linear section and intersecting on the x-axis, the bandgap of photocatalyst can be evaluated (Elangovan et al, 2021), with F(R) according to equation 1.…”

Section: Semiconductor Analysismentioning

confidence: 99%

“…Nowadays, titanium dioxide (TiO2) was the most common and promising photocatalyst used in hydrogen production (Slamet et al, 2017;Zhao et al, 2016), waste minimalization (Elangovan et al, 2021;Sharotri et al, 2016), dye-sensitized solar cells (Zhao et al, 2016). It is commonly used as a semiconductor due to the compound's stability, pollutant-free nature, availability in nature, inexpensiveness, and resistance to corrosion (Acar et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…CdS modified with TiO2 nanoparticle or TiO2 nanotube arrays (TNTA) as a semiconductor has shown remarkable performances in the field of photocatalytic performance. For instance, several studies using TiO2/TNTA-CdS for H2 production (Junn Ng et al, 2020;Wang et al, 2014;Zhao et al, 2016;Zhu et al, 2015), methane production (Park et al, 2016), and for degrading dye and diclofenac pollutants (Elangovan et al, 2021;Li et al, 2015). This photocatalyst was selected to minimize the recombination and enhance the activating response to visible light.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Hydrogen Generation using CdS-modified TiO2 Nanotube Arrays in 2,4,6-Trichlorophenol as a Hole Scavenger

Ratnawati

Slamet

Toya

et al. 2022

Int. J. Renew. Energy Dev.

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Nowadays, the lack of renewable energy such as hydrogen, and other environmental issues are problems that must be resolved. 2,4,6-Trichlorophenol (2,4,6-TCP) is classified as a recalcitrant pollutant due to its carcinogenic properties, high toxicity, and dangers to the environment therefore it needs to be eliminated. Hydrogen production using organic pollutant (2,4,6-TCP solution) as a hole scavenger on CdS-TiO2 nanotube arrays photocatalyst (TNTA-CdS) has been investigated at various CdS loading on TNTA and the initial concentration of 2,4,6-TCP. The TNTA sample was prepared by anodization and followed by an electrodeposition method to decorate CdS on TNTA. The H2 which was generated by reduction H+ and the 2,4,6-TCP removal was performed simultaneously by photocatalysis with TNTA-CdS as photocatalyst. The mole ratio of CdCl2:CH3CSNH2 as precursors of CdS deposited on TNTA (CdS loading) were 0.1:0.06, 0.2:0.12, and 0.4:0.24 and the initial concentration of 2,4,6-TCP were 10, 20 and 40 ppm. Meanwhile, the photocatalytic performance of the variations in CdS loading on TNTA and initial concentration of 2,4,6-TCP toward hydrogen generation was investigated in a photoreactor for 240 minutes under visible light irradiation with a mercury lamp as a photon source. The CdS decorating on TNTA was confirmed by SEM, EDX, and X-ray diffraction (XRD) characterization. According to the UV-Vis and XRD analysis, the TNTA-CdS samples have bandgap energies in the range of 2.71 - 2.89 eV and comprise a 100% anatase phase. Based on the photocatalysis results, the optimum composition of CdS loading is 0.2:0.16 (TNTA-CdS-2) which produced the highest total hydrogen (2.155 mmol/g) compared to the other compositions and produced 1.5 times higher compared to TNTA at 40 ppm of 2,4,6-TCP.

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Pharmaceutically Active Compounds’ (PhACs) Threat: An Environmental Prospective

Ravi

Golder

2023

Sustainable Environment

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Photocatalytic degradation of diclofenac using TiO2-CdS heterojunction catalysts under visible light irradiation

Cited by 39 publications

References 76 publications

Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

Enhancing Hydrogen Generation using CdS-modified TiO2 Nanotube Arrays in 2,4,6-Trichlorophenol as a Hole Scavenger

Pharmaceutically Active Compounds’ (PhACs) Threat: An Environmental Prospective

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