Enhanced photodegradation of methylene blue with alkaline and transition‐metal ferrite nanophotocatalysts under direct sun light irradiation

Ali, Nauman; Zada, Amir; Zahid, Muhammad; Ismail, Ahmed E.; Rafiq, M.; Riaz, Aaisha Riaz Aaisha; Khan, Adnan

doi:10.1002/jccs.201800213

Cited by 96 publications

(20 citation statements)

References 45 publications

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“…An overall decrease in percent degradation was observed as the pH was raised to 10. This may be attributed to the positively charged surface of the TMS at lower pH 4 as reported earlier . A positively charged surface gives rise to a strong electrostatic attraction between the positively charged TMS surface and the ARS molecule leading to maximum photo‐degradation of ARS.…”

Section: Resultssupporting

confidence: 55%

“…This may be attributed to the positively charged surface of the TMS at lower pH 4 as reported earlier. [59] A positively charged surface gives rise to a strong electrostatic attraction between the positively charged TMS surface and the ARS molecule leading to maximum photo-degradation of ARS. The surface of TMS is positively charged at a lower pH range and negatively charged at a high pH range.…”

Section: Effect Of Phmentioning

confidence: 99%

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Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

Ali

Ahmad

Khan

et al. 2020

Chemistry An Asian Journal

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Water pollution is one of the major global challenges today. Water bodies are contaminated by the heavy release of waste effluents of textile industries, which includes intensively colored dye pollutants. Herein, a ternary nanocomposite of bismuth copper selenide with small particle size and ternary metal selenide (TMS)‐chitosan microspheres (TMS‐CM) of the spherical porous surface were successfully synthesized. SEM, XRD, EDX, FTIR, and UV/Vis spectrophotometry analysis revealed the structural and morphological characteristics of the newly synthesized nanocomposites. SEM imaging showed the average diameter of TMS nanoparticle to be 33 nm. The crystal size was calculated as 6.33 nm and crystalline structure as orthorhombic using XRD findings. EDX confirmed the presence of Bi, Cu, and Se in the ternary nanocomposite. The bandgap of 1.8 eV was calculated from Tauc's plot for the TMS nanocomposite. SEM confirmed the successful synthesis of spherical TMS‐CM microspheres of porous surface morphology with an average size of 885.6 μm. The presence of chitosan microspheres in the synthesis of TMS nanocomposite was identified by FTIR spectral analysis. Furthermore, highly efficient photocatalytic degradation (up to 95.4%) of ARS was achieved within 180 min at pH 4.0 using 0.5 g of TMS‐CM in sunlight. The first‐order kinetic model fitted well to the photocatalytic decontamination of ARS using TMS‐CM with a rate constant of 6.1x10−2 min−1. The TMS‐CM gave attractive results and high efficiency in photocatalytic degradation of ARS dye after reusing and regeneration of up to seven successive cycles. The newly synthesized nanophotocatalyst could be efficiently used for the decontamination of dye polluted water from textile industries.

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Section: Resultssupporting

confidence: 55%

Section: Effect Of Phmentioning

confidence: 99%

Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

Ali

Ahmad

Khan

et al. 2020

Chemistry An Asian Journal

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“…Thus, we can say that * OH radical played a major role in the photocatalytic degradation of Allura Red AC comparative to the other active species. [134,135] In addition to this, position of the conduction band potential (E CB ) and the valence band potential (E VB ) were calculated using the equations (3,4) E VB ¼ XÀ E e þ 0:5 ðE g Þ…”

Section: In-situ Radical Capture Experimentsmentioning

confidence: 99%

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Pratibha

Rajput

2020

ChemistrySelect

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An autocombustion technique was adopted to synthesize the Perovskite structured Lanthanum iron oxide nanoparticles (LaFeO3, abbreviated as LFO NPs). This technique offered lots of benefits such as short reaction time along with quick heating rate. LFO NPs were fabricated at different calcination temperatures (300‐800 °C) through the aid of sucrose as chelating agent. The prepared LFO NPs were well characterized by various techniques like X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), Vibrating sample magnetometer (VSM), Ultraviolet‐Visible spectroscopy (UV‐Vis), Brunauer–Emmett–Teller (BET), X‐ray Photo‐Electron Spectroscopy (XPS) and Transmission electron microscopy (TEM) which affirmed that highly crystalline LFO NPs were obtained at 700 °C. Subsequently, the catalytic activity of the LFO NPs was surveyed for three independent approaches: (i) for the synthesis of functionalized piperidines through activation of carbonyl groups in the reacting partners (ii) for the sunlight‐assisted mineralization of health hazardous food colorant, Allura Red AC (iii) for the hydrogenation of nitro aromatic compounds (NACs) using NaBH4 (sodium borohydride) as source of hydrogen in aqueous medium at room temperature.

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“…Since lower is the intensity of PL peak, lower is the charge recombination, we can conclude that loading of Au nanoparticles improves charge separation and 2AuZnO sample imparts the highest activity due to improved charge separation as compared to other samples. [ 46,47 ]…”

Section: Resultsmentioning

confidence: 99%

Visible light‐excited surface plasmon resonance charge transfer significantly improves the photocatalytic activities of ZnO semiconductor for pollutants degradation

Yasmeen

Zada

Ali

et al. 2020

J Chinese Chemical Soc

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To effectively address environmental pollution, we synthesized Au-loaded ZnO nanocomposites and applied for the photocatalytic degradation of 2-chlorophenol (2-CP) under visible light irradiation. The as-prepared nanophotocatalysts delivered much improved photocatalytic degradation activities as compared to the bare ZnO nanoparticles and 32% of the pollutant was degraded with 2AuZnO in 1 hr. These improved photoactivities are attributed to the extended visible light absorption due to the surface plasmon resonance property of the loaded Au nanoparticles. Moreover, Au nanoparticles played important role in charge separation by inducting excited electrons to the conduction band of ZnO photocatalyst and surface catalysis as confirmed from photoluminescence spectra and amount of the generated hydroxyl radicals. The trapping experiments confirmed that positive holes were the major degrading species during the photocatalytic degradation of 2-CP. This work provides a feasible way to improve the photocatalysis by introducing a proper amount of noble metals over the surface of semiconductor photocatalysts.

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Enhanced photodegradation of methylene blue with alkaline and transition‐metal ferrite nanophotocatalysts under direct sun light irradiation

Cited by 96 publications

References 45 publications

Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Visible light‐excited surface plasmon resonance charge transfer significantly improves the photocatalytic activities of ZnO semiconductor for pollutants degradation

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