Cr doped ZnO nanoparticles as photocatalyst for the degradation of methylene blue dye

Mathai, Jincy; Anjana, M.P.; Aleena, P.A.; Thomas, Susmi Anna; Jose, Ayona K.; Kunjumon, Jibi; Nair, Sutheertha S.; Isaac, R. S. Rimal; Sajan, D.

doi:10.1016/j.jics.2023.101067

Cited by 12 publications

(2 citation statements)

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“…The inclusion of chromium ions with the ZnO creates additional impurity levels or point defects in the ZnO lattice and thereby improves its physicochemical properties [4]. The inclusion of chromium with the ZnO augments the optoelectronic, optoelectrical, photocatalytic, magnetic, and antimicrobial properties of ZnO nanostructures [1,[5][6][7][8]. Liu et al manufactured chromium-doped ZnO nanoparticles via the sol-gel process and reported that the room-temperature ferromagnetic property of such nanoparticles results from the exchange interactions among the O 2p and Cr 3d spin moments [9].…”

Section: Introductionmentioning

confidence: 99%

“…To date, several strategies, such as sol-gel [14], hydrothermal [8], solvothermal [15], co-precipitation [16], microwave combustion [17], auto-combustion [18], thermal decomposition [19], and green [20] have been employed to synthesize Cr-doped ZnO nanoparticles. Among these strategies, the coprecipitation approach has many advantages, such as easy reproducibility, high yield, low cost, easy control of particle size, and no necessity for organic solvents.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Rizwana Begum,

Anitha,

Thirumurugan

et al. 2024

J. Phys.: Condens. Matter

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This study explores the influence of chromium content and temperature on the magnetic characteristics of ZnO synthesized via the cost-effective coprecipitation approach. The host ZnO structure is not significantly changed by chromium doping, even at 5 wt.% of chromium concentration, according to x-ray diffraction studies. The Zn–O characteristic stretching vibration band at 480 cm−1 and the other functional group attached to the Cr-doped ZnO nanoparticles are confirmed by Fourier-transform infrared (FTIR) spectroscopy studies. Diffuse reflectance spectroscopy analysis shows the interaction between chromium ions and ZnO causes bandgap narrowing, and the observed optical bandgap values fall as chromium content increases in the host ZnO matrix. Point defects such as zinc interstitial, zinc vacancy, and oxygen vacancy that exist in the Cr-doped ZnO nanoparticles are inveterate through photoluminescence spectroscopy. Vibrating sample magnetometry investigations reveal weak ferromagnetic behavior at low applied fields and diamagnetic signatures dominating at high applied fields in the Cr-doped ZnO nanoparticles at 300 K. The magnetic characteristics are also tunable in terms of temperatures, which opens new avenues for fabricating dilute magnetic semiconductors with various applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Rizwana Begum,

Anitha,

Thirumurugan

et al. 2024

J. Phys.: Condens. Matter

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Multilayer adsorption of reactive orange 16 dye onto Fe₂O₃/ZnO hybrid nanoadsorbent: mechanistic insights from kinetics, isotherms and dynamic light scattering studies

Hussain,

Asif,

Shafaat

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDFe2O3/ZnO hybrid nanoadsorbent was synthesized by the coprecipitation method and characterized. The hydrodynamic size and stability of the nanoadsorbent were investigated in batch adsorption of toxic Reactive orange (RO)16 dye at increasing concentrations. The mechanism of monolayer and multilayer dye adsorption was elucidated for the first time together through dynamic light scattering (DLS), isotherm, kinetic and thermodynamic studies. A tomato seed germination assay was performed to confirm the material and treated water toxicity.RESULTSThe ferromagnetic nanoadsorbent exhibited 85% RO16 dye removal. Nonlinear fitting of isotherm and kinetic models suggest the chemisorption (monolayer) and physisorption (multilayer) of dye over the heterogeneous surface of the nanoadsorbent, respectively, at lower and higher concentration of dye. In line with these mechanistic insights, DLS studies demonstrate that monolayer adsorption increased hydrodynamic size up to 100 mg L−1 by face‐off binding of dye molecules, whereas multilayer adsorption was in the 100–500 mg L−1 concentration range; besides increase in adsorption capacity, did not magnify hydrodynamic size owing to face‐on binding with multiple dye molecule stacking. Zeta potential data confirmed greater stability of the nanoadsorbent at solution pH with large hydrodynamic size. Thermodynamic studies suggested that endothermic and spontaneous adsorption process primarily controlled physical adsorption at higher dye concentrations. A toxicity assay proved that the nanoadsorbent and treated water are environmentally safe.CONCLUSIONDLS, isotherm and kinetic studies elucidated the complex adsorption mechanism over a heterogenous surface of a hybrid nanoadsorbent. It was found that monolayer chemisorptive face‐off binding of RO16 molecules increased hydrodynamic size whereas multilayer physisorptive face‐on binding did not affect hydrodynamic size; rather, it remained stable with increasing RO16 concentration. © 2024 Society of Chemical Industry (SCI).

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A novel green synthesis of CuFe2O4 Nanoparticles from Cissus rotundifolia for photocatalytic and antimicrobial activity evaluation

Jabeen,

Siddiqui,

Sharma

et al. 2024

Journal of Alloys and Compounds

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Cr doped ZnO nanoparticles as photocatalyst for the degradation of methylene blue dye

Cited by 12 publications

References 43 publications

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Multilayer adsorption of reactive orange 16 dye onto Fe₂O₃/ZnO hybrid nanoadsorbent: mechanistic insights from kinetics, isotherms and dynamic light scattering studies

A novel green synthesis of CuFe2O4 Nanoparticles from Cissus rotundifolia for photocatalytic and antimicrobial activity evaluation

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Cr doped ZnO nanoparticles as photocatalyst for the degradation of methylene blue dye

Cited by 12 publications

References 43 publications

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Insights into the compositional and temperature-mediated magnetic characteristics of chromium-doped ZnO nanoparticles

Multilayer adsorption of reactive orange 16 dye onto Fe2O3/ZnO hybrid nanoadsorbent: mechanistic insights from kinetics, isotherms and dynamic light scattering studies

A novel green synthesis of CuFe2O4 Nanoparticles from Cissus rotundifolia for photocatalytic and antimicrobial activity evaluation

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Multilayer adsorption of reactive orange 16 dye onto Fe₂O₃/ZnO hybrid nanoadsorbent: mechanistic insights from kinetics, isotherms and dynamic light scattering studies