Visible Light Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes with CuWO4-GO Nano Composite

Medidi, Sunitha; Markapurapu, Sowmyasree; Kotupalli, Mastan Rao; Chinnam, R.K.; Susarla, Venkata Mahalakshmi; Gandham, Hima Bindu; Sanasi, Paul Douglas

doi:10.4236/mrc.2018.72002

Cited by 20 publications

(10 citation statements)

References 27 publications

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“…Crude experimental positioning with brief characterization was enlisted and scientifically supported − in Table . FTIR spectra have been proven to contribute less toward the whole discussion, so their literature-based interpretation − and commentary were moved to Supporting Information p S11 with Table S4.…”

Section: Resultsmentioning

confidence: 99%

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

et al. 2022

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This comprehensive work showcases two novel, rock-salt-type minerals in the form of amphoteric cerium–tungstate double perovskite and ilmenite powders created via a high-temperature solid-state reaction in inert gases. The presented studies have fundamental meaning and will mainly focus on a detailed synthesis description of undoped structures, researching their possible polymorphism in various conditions and hinting at some nontrivial physicochemical properties like charge transfer for upcoming optical studies after eventual doping with selectively chosen rare-earth ions. The formerly mentioned, targeted A 2 BB′X 6 group of compounds contains mainly divalent alkali cations in the form of XII A = Ba 2+ , Ca 2+ sharing, here, oxygen-arranged clusters ( II X = O 2– ) with purposely selected central ions from f-block VI B = Ce 4/3+ and d-block VI B′ = W 4/5/6+ since together they often possess some exotic properties that could be tuned and implemented into futuristic equipment like sensors or energy converters. Techniques like powder XRD, XPS, XAS, EPR, Raman, and FTIR spectroscopies alongside DSC and TG were involved with an intent to thoroughly describe any possible changes within these materials. Mainly, to have a full prospect of any desirable or undesirable phenomena before diving into more complicated subjects like: energy or charge transfer in low temperatures; to reveal whether or not the huge angular tilting generates large enough dislocations within the material’s unit cell to change its initial properties; or if temperature and pressure stimuli are responsible for any phase transitions and eventual, irreversible decomposition.

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Section: Resultsmentioning

confidence: 99%

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

et al. 2022

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“…During light irradiation, 2 mL of the solution was taken out at a fixed interval for UV–Vis spectroscopy. The absorbance peaks for MNZ (318 nm), TC (357 nm) and MG (618 nm) were measured using UV–visible spectroscopy, and a decrease in intensity with irradiation time was measured (Huang et al 2013 ; Medidi et al 2018 ; Saghi and Mahanpoor 2017 ). The photocatalytic degradation efficiency ( η ) was calculated using %, where, C 0 and C represent degradation of pollutant before and after irradiation at time t , respectively.…”

Section: Resultsmentioning

confidence: 99%

MoSe2-modified ZIF-8 novel nanocomposite for photocatalytic remediation of textile dye and antibiotic-contaminated wastewater

Mittal¹,

Ivaturi

Khanuja³

2022

Environ Sci Pollut Res

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COVID-19-led antibiotic waste generated from hospitals and health centres may cause serious health issues and significantly impact the environment. In the coming decades, antibiotic resistance will be one of the most significant threats to global human health. Photocatalytic water remediation is an effective and promising environmental solution that can be utilized to address this issue, to convert antibiotic waste into non-toxic products by utilizing renewable and abundant solar energy. In the present study, a novel nanocomposite of zeolitic imidazolate frameworks (ZIF-8) and molybdenum diselenide (MoSe 2 ) was efficiently synthesized by the solvothermal method for the complete degradation of the antibiotics and textile waste from water. The morphology, crystallinity and band gap of the samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and UV–visible spectroscopy. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) provide the binding information of the sample. The photocatalytic activity was tested for degradation of the antibiotics (tetracycline hydrochloride (TC) and metronidazole (MNZ)) used in COVID-19 treatment and textile dye (malachite green). Time-resolved photoluminescence spectroscopy confirmed the enhanced charge separation in the MoSe 2 @ZIF-8 nanocomposite with an average lifetime of 4.72 ns as compared to pristine samples. The nanocomposite showed ~ 100% removal efficiency with rate constants of 63 × 10 −3 , 49 × 10 −3 and 42 × 10 −3 min −1 for TC, MNZ and malachite green, respectively. The photocatalytic degradation of TC was carried out under different pH conditions (4, 7 and 9), and the degradation mechanism was explained on the basis of zeta potential measurements and active species trapping experiment. The by-products of the photocatalytic treatment of TC antibiotics were tested using liquid chromatography-mass spectroscopy (LC–MS), and they were found to be non-toxic for aquatic and human life. The regeneration property of the nanocomposite was confirmed by FESEM with regeneration efficiency of 88.7% in the 4th cycle. Thus, MoSe 2 @ZIF-8-based photocatalysts have potential application in water remediation, especially in making the antibiotic waste less toxic.

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“…A amostra de NiO, entretanto, tende à diminuição de Eg com o aumento da temperatura do tratamento térmico [2,[13][14][15][16]. Isto pode decorrer da aproximação das partículas de NiO que possuem um raio atômico inferior e que, com o fenômeno de coalescência, cria uma rede com maior disposição de elétrons livres.…”

Section: Caracterização Das Amostras De Zno's Nio's E Nio-zno'sunclassified

Síntese de NiO-ZnO por método da combustão em etapa única para fotodegradação do corante verde malaquita

Valadares¹,

Sales²

2022

Cerâm. ind.

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Ensaios de NiO-ZnO's tratados termicamente foram obtidos em etapa única pelo método da combustão e tiveram suas capacidades fotocatalíticas analisadas. Técnicas de DRX, MEV, EDS, DRS foram empregadas para caracterizar o material fotocatalítico investigado. Análises de DRX apontaram a presença de duas fases com contribuições de NiO e ZnO. Micrografias obtidas de MEV comprovaram a presença dos semicondutores após processo de síntese. EDS apontou grande presença de O nas NiO-ZnO, confirmando a formação de óxidos pela síntese de nitratos. DRS apontou para diminuição do 'bandgap' das NiO-ZnO's. O ensaio de fotodegradação do corante verde malaquita (VM) com adição das NiO-ZnO's tratadas termicamente a 400, 600, 800 e 1000 °C e fotólise sem adição catalítica foram de 51,53, 54,8, 53,68 e 27%, respectivamente. As NiO-ZnO's oriundas da combustão de nitratos apresentaram capacidade fotocatalítica e desempenho semelhantes.

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Visible Light Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes with CuWO4-GO Nano Composite

Cited by 20 publications

References 27 publications

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

MoSe2-modified ZIF-8 novel nanocomposite for photocatalytic remediation of textile dye and antibiotic-contaminated wastewater

Síntese de NiO-ZnO por método da combustão em etapa única para fotodegradação do corante verde malaquita

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Visible Light Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes with CuWO4-GO Nano Composite

Cited by 20 publications

References 27 publications

Synthesis Attempt and Structural Studies of Novel A2CeWO6 Double Perovskites (A2+ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A2CeWO6 Double Perovskites (A2+ = Ba, Ca) in and outside of Ambient Conditions

MoSe2-modified ZIF-8 novel nanocomposite for photocatalytic remediation of textile dye and antibiotic-contaminated wastewater

Síntese de NiO-ZnO por método da combustão em etapa única para fotodegradação do corante verde malaquita

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Product

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Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions