Ultrasound assisted synthesis of nano-rod embedded petal designed α-Bi2O3-ZnO nanoparticles and their ultra-responsive visible light induced photocatalytic properties

Thejaswini, T.V.L.; Prabhakaran, D.; Mohan, Akhila Maheswari

doi:10.1016/j.jphotochem.2016.12.001

Cited by 31 publications

(6 citation statements)

References 43 publications

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“…The structure peak with regard to (012) faster than the other peaks (020), ( 022), ( 102), ( 131) indicate a relatively preferred structural orientation along (012). The usual method that calculates the magnitude of the preferred orientation factor 'f' for a given plane relative to other planes in material was employed here [8][9][10]. According to this process the preferred orientation factor f (012) for the Zn doped Bi 2 O 3 thin films has been calculated by the fraction of (012) plane intensity over the sum of intensities of all peaks surrounded, for the given measuring 2θ range (20°-80°).…”

Section: Structural Characterizationmentioning

confidence: 99%

Structural and optical properties of Zn doped Bi2O3 thin films prepared by chemical route with effect of bath temperatures

Samidurai¹,

Karunanithi²,

Prabahar³

et al. 2022

JOBM

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The present work attempts to synthesize Zn doped Bismuth Oxide thin films deposited effectively on to micro glass substrates at different bath temperatures by Chemical Bath Route. The films were characterized by XRD, SEM, EDAX and optical analysis. XRD analysis reveals that all the films belong to monoclinic in polycrystalline structure with preferred orientation along (012). The optical energy gap values of Zn doped Bi2O3 thin films were in the range 2.21- 2.81 eV which depend on deposition temperatures. Zn - Bi2O3 thin films can be used in photo voltaic cells, gas sensors, optical coatings, flat-panel displays, micro electronics, light emitting diodes, batteries, super capacitors and fuel cell industries.

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Section: Structural Characterizationmentioning

confidence: 99%

Structural and optical properties of Zn doped Bi2O3 thin films prepared by chemical route with effect of bath temperatures

Samidurai¹,

Karunanithi²,

Prabahar³

et al. 2022

JOBM

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“…Furthermore, ( • OH) radicals are generated by the attack of trapped electrons on ( • HO2) radicals, which results in the effective photocatalytic degradation of MG via Equations ( 10)- (15). It may be inferred that, during the mineralization process of MG, the attack of ( • OH) or (h vb + ) results in the ring opening of the MG, resulting in aliphatic compounds that are further converted into CO2, H2O, and other inorganic compounds [57].…”

Section: Effect Of Scavengers and Mechanism Of Sonophotocatalysismentioning

confidence: 99%

“…The electrons present on the surface of the catalyst inhibit the molecular oxygen and, therefore, generation of the first superoxide radical anion ( 10)- (15). It may be inferred that, during the mineralization process of MG, the attack of ( • OH) or h + vb results in the ring opening of the MG, resulting in aliphatic compounds that are further converted into CO 2 , H 2 O, and other inorganic compounds [57].…”

Section: Mineralization Of Mgmentioning

confidence: 99%

Sonophotocatalytic Degradation of Malachite Green by Nanocrystalline Chitosan-Ascorbic Acid@NiFe2O4 Spinel Ferrite

et al. 2020

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Statistics show that more than 700 thousand tons of dye are produced annually across the globe. Around 10–20% of this is used in industrial processes such as printing and dyeing, while about 50% of the dye produced is discharged into the environment without proper physicochemical treatment. Even trace amounts of dye in water can reduce oxygen solubility and have carcinogenic, mutagenic, and toxic effects on aquatic organisms. Therefore, before dye-containing wastewater is discharged into the environment, it must be properly treated. The present study investigates the green synthesis of nickel ferrite NiFe2O4 (NIFE) spinel magnetic nanoparticles (MNPs) via chemical coprecipitation of a solution of Ni2+/Fe3+ in the presence of a biopolymer blend of chitosan (CT) and ascorbic acid (AS). The magnetic nanomaterial was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy–energy dispersive X-ray analysis (SEM-EDX), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-Vis), differential scanning calorimetry (DSC), and vibrating-sample magnetometry (VSM). The material was further explored as a catalyst for the photocatalytic degradation of malachite green (MG) under visible light irradiation coupled with ultrasonic waves. The combination of 90 min of visible solar light irradiation with 6.35 W·mL−1 ultrasonic power at pH 8 resulted in 99% of the photocatalytic efficiency of chitosan-ascorbic acid@NIFE (CTAS@NIFE) catalyst for 70 mg·L−1 MG. The quenching of the photocatalytic efficiency from 98% to 64% in the presence of isopropyl alcohol (IPA) suggested the involvement of hydroxy (•OH) radicals in the mineralization process of MG. The high regression coefficients (R2) of 0.99 for 35, 55, and 70 mg·L−1 MG indicated the sonophotocatalysis of MG by CTAS@NIFE was best defined by a pseudo first-order kinetic model. The mechanism involves the adsorption of MG on the catalyst surface in the first step and thereby mineralization of the MG by the generated hydroxyl radicals (•OH) under the influence of visible radiation coupled with 6.34 W·mL−1 ultrasonic power. In the present study the application of photodegradation process with sonochemistry results in 99% of MG mineralization without effecting the material structure unlike happens in the case adsorption process. So, the secondary pollution (generally happens in case of adsorption) can be avoided by reusing the spent material for another application instead of disposing it. Thus, the ecofriendly synthesis protocol, ease in design of experimentation like use of solar irradiation instead of electric power lamps, reusability and high efficiency of the material suggested the study to be potentially economical for industrial development at pilot scale towards wastewater remediation.

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“…Such p-n junctions act to spatially separate the photogenerated holes and electrons, reducing their recombination rate. As the Bi concentration increases, more α-Bi 2 O 3 is formed and thus charge separation mechanism may dominate the PCA [51][52][53].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Improvement of Bi doping in ZnO nanocrystals by co-doping with Al: crystal geometry calculations and photocatalytic activity

et al. 2020

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In this work we demonstrate enhancement in visible-light photocatalytic activity (PCA) of ZnO nanoparticles (NPs) with minimal attenuation of visible light transmittance. This approach can benefit numerous optoelectronic and photocatalytic applications. ZnO NPs were p-n co-doped with Al and Bi to improve Bi doping into the ZnO crystal. Al- and/or Bi-doped ZnO was coprecipitated by ammonia from aqueous nitrate solutions of Zn2+, Al3+, and Bi3+, followed by microwave heating. Doping concentrations in Al- and Bi- doped ZnO (AZO and BZO) and Al/Bi co-doped ZnO (ABZO) were 1, 3, 5, and 7 mole %. The resulting NPs were characterized by XRD, TEM, EDS, BET, and UV-visible absorption. While EDS shows that almost all added Bi was incorporated into the ZnO, XRD analysis of BZO reveals formation of α-Bi2O3 as a secondary phase due to the poor Bi solubility in ZnO. Co-doping of Al with Bi suppressed α-Bi2O3 formation and increased Bi solubility in ZnO. XRD-based calculations of the lattice constants and deformation strain, stress, and energy all show insertion of Al and/or Bi into the crystal with different extents according to the dopants’ solubilities into ZnO. AZO and BZO NPs had E g lowered by 0.05–1.39 eV and 0.30–0.70 eV, respectively, relative to ZnO. On the other hand, ABZO had E g reductions of only 0.01–0.20 eV due to formation of acceptor-donor complex through co-doping. ABZO gave higher PCA enhancements with respect to E g reductions (Δk photo/–ΔE g) than either AZO and BZO, with values up to 370, 126, and 13 min–1 eV–1, respectively.

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Ultrasound assisted synthesis of nano-rod embedded petal designed α-Bi2O3-ZnO nanoparticles and their ultra-responsive visible light induced photocatalytic properties

Cited by 31 publications

References 43 publications

Structural and optical properties of Zn doped Bi2O3 thin films prepared by chemical route with effect of bath temperatures

Structural and optical properties of Zn doped Bi2O3 thin films prepared by chemical route with effect of bath temperatures

Sonophotocatalytic Degradation of Malachite Green by Nanocrystalline Chitosan-Ascorbic Acid@NiFe2O4 Spinel Ferrite

Improvement of Bi doping in ZnO nanocrystals by co-doping with Al: crystal geometry calculations and photocatalytic activity

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