Insight in to the degradation of bisphenol A by doped ZnO@ZnHCF nanocubes: High photocatalytic performance

Rani, Manviri; Shanker, Uma

doi:10.1016/j.jcis.2018.06.070

Cited by 56 publications

(13 citation statements)

References 77 publications

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“…Furthermore, the unavailability of catalyst surfaces for the generation of hydroxyl radicals may reduce photocatalytic activity 29 . Escalating the initial concentration decreases the path length of the photon that falls on the surface of the photo‐active catalyst (the Beer–Lambert law) and reduces the excitation of electrons from the valence band to the conduction band 28 . The overdose of pollutants may affect the e − /h + pair formation capability of nanocatalyst or prevent the penetration of the irradiation (visible light) and may accumulate on the catalyst 55 .…”

Section: Resultsmentioning

confidence: 99%

“…One of the most useful nanoparticles is chromium oxide (Cr 2 O 3 ), which has a large band gap and distinctive magnetic, electrical, catalytic, and optical properties 32 . Because they require a UV exposure source for excitation, these nanoparticles are less useful as solar‐powered materials 28 . Additionally, their effectiveness is decreased by charge carrier entrapment, rapid charge carrier recombination, and a small surface area that is accessible.…”

Section: Introductionmentioning

confidence: 99%

“…32 Because they require a UV exposure source for excitation, these nanoparticles are less useful as solar-powered materials. 28 Additionally, their effectiveness is decreased by charge carrier entrapment, rapid charge carrier recombination, and a small surface area that is accessible. These nanomaterials' bandgap alteration, surface flaws, light absorption, and high recombination efficiency of photogenerated e À /h + and visible light operated material may be overcome by modifying/doping them with polymer, enzyme, and another metal oxide.…”

mentioning

confidence: 99%

“…[23][24][25] Therefore, the nanomaterialsmediated advanced oxidation process is one of the promising and cost-effective option with improved photocatalytic efficiency. [25][26][27][28][29] Earlier various metal oxides (TiO 2 , ZnO, Cr 2 O 3 , and Bi 2 O 3 ) have been synthesized and commercially used for waste water treatment due to their unique physicochemical properties. 28,30,31 One of the most useful nanoparticles is chromium oxide (Cr 2 O 3 ), which has a large band gap and distinctive magnetic, electrical, catalytic, and optical properties.…”

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Efficient photocatalytic degradation of emerging pollutants by green synthesized Prussian blue analogue nanocomposite

Yadav

Rani

Shanker

2022

Env Prog and Sustain Energy

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Worldwide consumption, toxicity, and bioaccumulation of paracetamol (PCM) and atenolol (ATL) has drawn attention of researchers over last decades. A small portion of these drugs is absorbed by human body and rest of them is excreted through urine and feces to the environment (water bodies and soil) which might result in negative impacts. Nanocomposite of chromium oxide coupled with zinc hexacyanocobaltates (Cr 2 O 3 @ZnHCC) was synthesized by a green-method using Sapindus mukorossi seed-extract for the removal of targeted drugs. Microscopic and spectroscopic analysis of Cr 2 O 3 @ZnHCC showed uniformly incorporated prisms into cubic structure having ~75 nm particle size. Well-characterized Cr 2 O 3 @ZnHCC and individuals (Cr 2 O 3 & ZnHCC) were utilized for the degradation of PCM and ATL under direct sunlight and dark conditions. Highest degradation of targeted drugs (91%-94%) resulted at 20 mg L À1 concentration of pollutant, 25 mg of catalyst dose, and pH ~7 under daylight exposure (5 h). First-order kinetics followed with a high adsorption capacity, X m (13.4-14.5 mg g À1 ) value was obtained to confirm the strong binding with the pollutants. Moreover, Cr 2 O 3 @ZnHCC substantially suppressed the half-life of targeted drugs (PCM: 0.6 h; ATL: 2.9 h) and converted them into safer-small metabolites as confirmed by liquid chromatography-mass-spectrometry analysis, and the reduction of carbon content was confirmed by total organic carbon analysis. The charge separation mechanism was assisted by UV reflectance and photoluminescence data. The synthesized green-nano photocatalyst displayed high reproducibility (up to 10th cycle), sensitivity, and stability during the degradation process which makes this a suitable candidate for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient photocatalytic degradation of emerging pollutants by green synthesized Prussian blue analogue nanocomposite

Yadav

Rani

Shanker

2022

Env Prog and Sustain Energy

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“…75,85 Esse grupo também aplicou esse hexacianoferrato na fotocatálise de corantes, como o Negro de Eriocromo T e o Verde Malaquita, com degradação de 76 e 94% dos compostos, respectivamente. 85 O trabalho de Rani e colaboradores aplicou um nanocompósito ZnO/HCFZn de área superficial 113,91 m 2 g -1 na degradação de bisfenol, com o material fotodegradando 97% do composto sob radiação solar 133. De acordo com trabalhos relatados na literatura, nota-se que a síntese de nanocompósitos envolvendo o hexacianoferrato de zinco e nanoestruturas de carbono como grafeno e nanotubos é pouco explorada,[134][135][136] sendo que desses três trabalhos dois envolvem a aplicação como dispositivos para armazenamento de energia e um é relacionado a capacidade de adsorção de íons césio por parte do nanocompósito.…”

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Síntese e aplicação de hexacianoferrato de zinco e seus nanocompósitos à base de nanoestruturas de carbono na degradação de contaminantes emergentes

Nossol¹

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This work involves the synthesis and characterization of zinc hexacyanoferrate (HCFZn) and their respective composites, zinc hexacyanoferrate/graphene oxide (HCFZn/OG) and zinc hexacyanoferrate/carbon natotubes (HCFZn/NTC) aiming the application of these materials as photocatalysts in the degradation of paracetamol and ranitidine. The results obtained by X-ray diffraction revealed that all samples have the same rhombohedral crystal structure indexed to the Zn II 3[Fe III (CN)6]2 formula. From the results obtained by IR spectroscopy, the characteristic bands of hexacyanoferrate can be observed in the regions of 2187/2101 cm-1 (νC≡N), 553 cm-1 , (δFe-CN) and 439 cm-1 (δFe-C). In addition, using Raman spectroscopy confirmed the presence of carbon materials, by observation of the characteristic D and G bands. In the images obtained by scanning electron microscopy (SEM) it was possible to observe HCFZn microparticles (~2.0 µm), which decrease in size in the presence of carbon nanomaterials. The degradation of the pollutants was monitored by high performance liquid chromatography, and the pH value and mass of the catalysts were evaluated using a triplicate central point factorial design 2 2 for each compound. The best degradation condition obtained for pure HCFZn led to a degradation of 78% of paracetamol and 66% of ranitidine, employing the mass of 5.0 mg and pH= 6.0. However, for HCFZn/OG and HCFZn/NTC nanocomposites results superior than 90% of degradation for both drugs were achieved under the same conditions, except for HCFZn/NTC in ranitidine degradation, where the lowest pH value (2.0) was the most appropriate condition. The excellent degradation results obtained may originate from the high surface area presented by HCFZn (896 m 2 g-1) and the respective HCFZn/OG (692 m 2 g-1) and HCFZn/NTC (473 m 2 g-1) nanocomposites. The better performance presented by nanocomposites may be due to the high adsorption capacity of the carbon materials and also to an increase of the electronic transfer rate, with consequent favoring of the redox process and higher efficiency in the electron/hole pair separation.

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Polyoxometalates/polymer composites for the photodegradation of bisphenol‐A

Brahmi

Benltifa

Ghali

et al. 2021

J of Applied Polymer Sci

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Nowadays water scarcity represents a threat for human and living beings. Therefore, to satisfy the demands of people for clean and safe water, new technologies for wastewater treatment have been developed. Thus, photocatalysis has emerged as a green chemical approach for such treatment. In this context, new polyoxometalate (POM)/polymer composites with relevant photocatalytic properties have been developed via an easy and cheap photopolymerization process upon mild visible light irradiation at 405 nm. This fruitful association between POM and polymer allowed the obtention of shaped materials facile to collect and reuse at the end of the photocatalytic treatment avoiding then the usual timeconsuming regeneration methods. The prepared photocomposites displayed excellent photocatalytic performance for the removal of bisphenol-A from water under different sources of irradiation. Hence, 100%, 88%, and 50% of this model compound were decomposed by the phosphomolybdic composite under just 90 min of UV lamp, solar and LED@375 nm irradiations, respectively. The effectiveness of these developed photocatalysts towards the degradation of other organic compounds, as well as the degradation mechanism based on the generation of highly reactive chemicals such as • OH radicals promoting the degradation were already reported. Bisphenol-A degradation pathway and the identification of the photoproducts were discussed using mass spectroscopy technique. Therefore, this paper highlighted the photocatalytic efficiency of the new manufactured materials for the photodegradation of the bisphenol-A, thus expanding their application fields, under different sources of irradiation and under pure solar irradiation which make their applications more interesting and less energy consuming.

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Insight in to the degradation of bisphenol A by doped ZnO@ZnHCF nanocubes: High photocatalytic performance

Cited by 56 publications

References 77 publications

Efficient photocatalytic degradation of emerging pollutants by green synthesized Prussian blue analogue nanocomposite

Efficient photocatalytic degradation of emerging pollutants by green synthesized Prussian blue analogue nanocomposite

Síntese e aplicação de hexacianoferrato de zinco e seus nanocompósitos à base de nanoestruturas de carbono na degradação de contaminantes emergentes

Polyoxometalates/polymer composites for the photodegradation of bisphenol‐A

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