Efficient photocatalytic degradation of ciprofloxacin and bisphenol A under visible light using Gd2WO6 loaded ZnO/bentonite nanocomposite

Selvakumar, Karuppaiah; Raja, A.; Arunpandian, M.; Stalindurai, Kesavan; Rajasekaran, P.; Sami, Ponnusamy; Nagarajan, E.R.; Swaminathan, Madhavan

doi:10.1016/j.apsusc.2019.03.178

Cited by 122 publications

(27 citation statements)

References 54 publications

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“…193 ng/L BPA was detected in the surface water and 39 ng/L in the subsurface and bottom waters (Rachna et al, 2019 ). The release of BPA into the environment poses a threat to human health even at low exposure levels (Selvakumar et al, 2019 ). As is well-known, BPA is stable in an aqueous solution and is refractory to degradation because it consists of two benzene rings in a symmetrical structure.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Porous ZnO Nanoparticles Efficient for Photocatalytic Degradation of Biomass-Derived Bisphenol A Under Simulated Sunlight Irradiation

Wang

Kang

Yang

et al. 2021

Front. Bioeng. Biotechnol.

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Bisphenol A (BPA) produced from biomass is a typical endocrine disrupting compound that is carcinogenic and genotoxic and can be accumulated in water due to its extensive use and difficult degradation. In this study, the porous ZnO photocatalyst with core-shell structure and large surface area was successfully developed for the efficient photocatalytic degradation of BPA. The various effects of calcination temperatures, BPA concentrations, ZnO dosages, pH and inorganic ions on the degradation performance were systemically studied. The results showed that 99% degradation of BPA was achieved in 1 h using the porous ZnO calcined at 550°C under the conditions of 30 mg/L BPA, 1 g/L ZnO, and pH of 6.5. Besides, the inhibition effects of anions for the photocatalytic removal of BPA decreased in the order of H2PO4- > HCO3- > SO42- > Cl−, while the cations K+, Ca2+, and Na+ had little effect on the photocatalytic degradation of BPA. The results of scavenging experiments showed that h+, ·O2-, and e− played the key role in the photocatalytic degradation process. Finally, the main pathways of BPA degradation were proposed based on ten intermediates found in the degradation process. This work may provide a good guideline to degrade various endocrine disrupting compounds in wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Porous ZnO Nanoparticles Efficient for Photocatalytic Degradation of Biomass-Derived Bisphenol A Under Simulated Sunlight Irradiation

Wang

Kang

Yang

et al. 2021

Front. Bioeng. Biotechnol.

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“…ZnO has a broader energy gap (3.2 eV) compared to TiO 2 , which directly contributes to lower photocatalytic activity (Nagao et al 2016). The modification of the structure of ZnO nanoparticles (ZnO NPs) with the addition of metal and metal oxide nanoparticles affects the distance between the conduction band and the valance band, which may improve the photocatalytic properties of the material (Karuppaiah et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The replacement of Zn 2+ with Zr 4+ disturbs the charge balance. The disturbed charge balance contributes to the adsorption of more hydroxide ions at the catalyst surface, which additionally blocks the recombination of electron-hole pairs (Karuppaiah et al 2019). Aghabeygi and Khademi-Shamami (2018) investigated ZnO/ZrO 2 nanocomposites prepared with ultrasonic irradiation.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic properties of zirconium oxide–zinc oxide nanoparticles synthesised using microwave irradiation

2019

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ZrO 2-ZnO nanoparticles with different mass concentrations of ZrO 2 (1%, 5%, 10%, 20%) were prepared using a two-stage precipitation method with microwave irradiation. The ZrO 2-ZnO with 10% of ZrO 2 had the highest photocatalytic activity. The obtained material was characterised using XRD, which confirmed a high crystal structure in the synthesised material, and transmission electron microscopy (TEM) analysis, which depicted that micro and nano needle-shaped particles had been obtained and that irregularly shaped nanoparticles were present on the surface of those particles. TEM-EDX analysis confirmed the presence of both ZnO and ZrO 2 in the product. FT-IR analyses showed that the positions of peaks related to Zn-O and Zr-O absorption bands did not change in ZrO 2-ZnO NPs. The initial concentration of Methylene Blue (MB), the pH of the solution, and the mass of the photocatalyst were investigated to determine the photocatalytic efficiency of the material and the degree of removal of the MB. The highest efficiency (97%) was obtained in the following conditions: 30 mg/ dm 3 of the MB solution, pH 9 and 70 mg ZrO 2-ZnO after 30 min of reaction time under UV irradiation.

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“…Photodegradation of BPA increases up to 40 mg of Ho 2 O 3 -ED-HPV and decreased thereafter. Therefore, increase in catalyst amount increases photodegradation efficiency due to increase in the reactive sites of catalyst [28]. At higher amount of catalyst, activity decreases as the surface area decreases due to aggregation.…”

Section: Effect Of Different Dosage Catalystmentioning

confidence: 99%

Photocatalytic efficiency of Ho2O3-ED-HPV in Bisphenol-A Removal

2019

IJITEE

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Efficient photocatalytic degradation of ciprofloxacin and bisphenol A under visible light using Gd2WO6 loaded ZnO/bentonite nanocomposite

Cited by 122 publications

References 54 publications

Facile Synthesis of Porous ZnO Nanoparticles Efficient for Photocatalytic Degradation of Biomass-Derived Bisphenol A Under Simulated Sunlight Irradiation

Facile Synthesis of Porous ZnO Nanoparticles Efficient for Photocatalytic Degradation of Biomass-Derived Bisphenol A Under Simulated Sunlight Irradiation

Photocatalytic properties of zirconium oxide–zinc oxide nanoparticles synthesised using microwave irradiation

Photocatalytic efficiency of Ho2O3-ED-HPV in Bisphenol-A Removal

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