Hydrothermally grown CdS nanoparticles for photodegradation of anionic azo dyes under UV-visible light irradiation

Senasu, Teeradech; Hemavibool, Khuanjit; Nanan, Suwat

doi:10.1039/c8ra02061b

Cited by 91 publications

(25 citation statements)

References 39 publications

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“…The characterization of this substance has been reported elsewhere [ 3 , 6 , 7 , 8 , 9 ]. The crystal structure of the sample was investigated using powder X-ray diffraction (XRD) and monochromatic Cu K α radiation.…”

Section: Methodsmentioning

confidence: 99%

“…The incomplete degradation of the pollutants together with the creation of secondary hazardous pollutants are the main drawbacks of this method [2]. Interestingly, photocatalytic Molecules 2021, 26, 5624 2 of 14 treatment is a clean and eco-friendly process for the degradation of pollutants [5][6][7][8][9]. It is generally known that commercially available TiO 2 is a UV-active photocatalyst (band gap of 3.2 eV).…”

Section: Introductionmentioning

confidence: 99%

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Sunlight-Active BiOI Photocatalyst as an Efficient Adsorbent for the Removal of Organic Dyes and Antibiotics from Aqueous Solutions

et al. 2021

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A bismuth oxyiodide (BiOI) photocatalyst with excellent sunlight-driven performance was synthesized by a solvothermal route without the addition of surfactants or capping agents. The prepared photocatalyst exhibited a tetragonal phase with an energy band gap of 2.15 eV. The efficiency of the photocatalyst was elucidated by monitoring the photodegradation of organic dyes and antibiotics. The BiOI photocatalyst provided a 95% removal of norfloxacin (NOR) antibiotics under visible light illumination. Interestingly, the complete removal of Rhodamine B (RhB) dye was achieved after 80 min of natural sunlight irradiation. The photodegradation reaction followed the first-order reaction. Both photo-generated holes and electrons play vital roles in the photodegradation of the pollutant. The BiOI photocatalyst remains stable and still shows a high efficiency even after the fifth run. This confirms the great cycling ability and high structural stability of the photocatalyst. The prepared BiOI catalyst, with a high surface area of 118 m2 g−1, can act as an excellent adsorbent as well. The synergistic effect based on both adsorption and photocatalysis is a key factor in achieving a very high removal efficiency. The photoactivity under sunlight is higher than that observed under visible light, supporting the practical use of the BiOI photocatalyst for the removal of organic pollutants in wastewater through the utilization of abundant solar energy.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sunlight-Active BiOI Photocatalyst as an Efficient Adsorbent for the Removal of Organic Dyes and Antibiotics from Aqueous Solutions

et al. 2021

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“…Many reports have focused on the use of ZnO as the photocatalyst, and some results have also shown a high photocatalytic degradation rate [38][39][40][41][42]. Iron oxide [43], cadmium sulphide [44], zinc sulphide [45], tungsten oxide [46], tin oxide [47], bismuth vanadate [48], and non-metallic carbon nitride [49,50] are also often employed as the photocatalysts for photodegradation too, as depicted in Figure 7b-d. Though the photocatalyst plays the vital role in [27]; reproduced from [27] with permission from the PCCP Owner Societies.…”

Section: Other Photocatalystsmentioning

confidence: 99%

Photocatalytic Degradation of Plastic Waste: A Mini Review

Lee

2021

Micromachines

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Plastic waste becomes an immediate threat to our society with ever-increasing negative impacts on our environment and health by entering our food chain. Sunlight is known to be the natural energy source that degrades plastic waste at a very slow rate. Mimicking the role of sunlight, the photocatalytic degradation process could significantly accelerate the degradation rate thanks to the photocatalyst that drastically facilitates the photochemical reactions involved in the degradation process. This mini review begins with an introduction to the chemical compositions of the common plastic waste. The mechanisms of photodegradation of polymers in general were then revisited. Afterwards, a few photocatalysts were introduced with an emphasis on titanium dioxide (TiO2), which is the most frequently used photocatalyst. The roles of TiO2 photocatalyst in the photodegradation process were then elaborated, followed by the recent advances of photocatalytic degradation of various plastic waste. Lastly, our perspectives on the future research directions of photocatalytic plastic degradation are present. Herein, the importance of catalytic photodegradation is emphasized to inspire research on developing new photocatalysts and new processes for decomposition of plastic waste, and then to increase its recycling rate particularly in the current pandemic with the ever-increasing generation of plastic waste.

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“…The recyclability of the 4% Y:SnO 2 photocatalyst was investigated to determine its stability and recyclability for potential application (Senasu et al 2018;Vignesh et al 2018). After photodegradation of MB dye for 180 min, the sample was strained and the 4% Y:SnO 2 PCs is washed by centrifuge with DI water and then dried in an oven for next recycle progression.…”

Section: Photocatalytic Performance and Carrier Concentrationmentioning

confidence: 99%

Photodegradation activity of yttrium-doped SnO2 nanoparticles against methylene blue dye and antibacterial effects

Baig¹,

Rathinam²,

Palaninathan³

2020

Appl Water Sci

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This review reports the effects of yttrium (Y) on the physicochemical characteristics of tin(II) dioxide (SnO 2) nanoparticles (NPs), which were efficiently synthesized via a simple hydrothermal chemical route with different doping concentrations (0, 2 and 4 at%) of Y. The structural, optical and photocatalytic properties of the as-prepared Y-doped SnO 2 (Y:SnO 2) NPs were investigated, and the results are described. X-ray diffraction (XRD) studies showed that the undoped and Y:SnO 2 NPs had a fine crystalline texture with a tetragonal structure and particle size range of 27-15 nm, although the size decreased with Y doping. High-resolution scanning electron microscopy (HRSEM) morphological analysis revealed spherical NPs forming agglomerates. Optical absorption was investigated by UV-visible diffuse reflectance spectroscopy, and showed a redshift in bandgap energy for Y 3+-doped SnO 2 NPs, and photoluminescence spectroscopy revealed the most intense emission peaks in the visible light region. Enhanced photocatalytic activity was observed for the doped samples, and the 4% Y:SnO 2 NPs exhibited excellent photodegradation of methylene blue aqueous (MB) dye in visible light, demonstrating 92.34% degradation in 180 min. The other photocatalysts also demonstrated greater than 85% photodegradation efficiency and high stability, with no significant reduction in activity observed after five cycles. The results indicate that the superoxide (• O 2 −) radical, a key reactive species, played a vital role in the degradation of aqueous MB dye. The probable photocatalytic mechanism of the Y:SnO 2 NPs was thoroughly investigated.

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Hydrothermally grown CdS nanoparticles for photodegradation of anionic azo dyes under UV-visible light irradiation

Abstract: A CdS photocatalyst was synthesized successfully at low temperature via a catalyst-free hydrothermal technique which is simple, green and also easily controlled.

Cited by 91 publications

References 39 publications

Sunlight-Active BiOI Photocatalyst as an Efficient Adsorbent for the Removal of Organic Dyes and Antibiotics from Aqueous Solutions

Sunlight-Active BiOI Photocatalyst as an Efficient Adsorbent for the Removal of Organic Dyes and Antibiotics from Aqueous Solutions

Photocatalytic Degradation of Plastic Waste: A Mini Review

Photodegradation activity of yttrium-doped SnO2 nanoparticles against methylene blue dye and antibacterial effects

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