Environmental remediation and synthesis of a new pigment by irradiation-induced adsorption of methylene blue onto undoped tetragonal zirconia

Neris, Alex de Meireles; Chantelle, Laís; Souza, João Jarllys Nóbrega de; Ferreira, J. M.; Fonseca, Maria G.; Santos, I. M. G.

doi:10.1016/j.matlet.2019.126588

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Furthermore, the behavior of the receptor density may be related to the composition of the cobalt oxide or another possible mechanism. This means that the presence of the NaOH (used for the pH change) can cause the substitution of the hydroxyl groups onto oxygen groups present in the material forming CoOH, which can lead to a change in the material and the surface charge [ 57 ]. Considering that receptors 1 and 2 can be associated with the quantity of each major group, in this case, the CoO and CoOH should be receptor sites 1 and 2, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

Dehbi,

Dehmani,

Franco

et al. 2024

Molecules

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The production of cobalt oxide nanoparticles and their use in the adsorption of methylene blue (MB) from solution is described in the paper. The X-ray diffraction patterns show that the synthesized cobalt oxide nanoparticles have a crystalline cubic structure. The study of the adsorption of methylene blue onto the cobalt oxide nanoparticles involved determining the contact time and initial concentration of the adsorption of MB on the adsorbent. The kinetics of adsorption were analyzed using two kinetic models (pseudo-first order and pseudo-second order), and the pseudo-second-order model was found to be the most appropriate for describing the behavior of the adsorption. This study indicates that the MLTS (monolayer with the same number of molecules per site) model is the most suitable model for describing methylene blue/cobalt oxide systems, and the parameter values help to further understand the adsorption process with the steric parameters. Indicating that methylene blue is horizontally adsorbed onto the surface of the cobalt oxide, which is bonded to two different receptor sites. Regarding the temperature effect, it was found that the adsorption capacity increased, with the experimental value ranging from 313.7 to 405.3 mg g−1, while the MLTS predicted 313.32 and 408.16 mg g−1. From the thermodynamic functions, high entropy was found around 280 mg L−1 concentration. For all concentrations and temperatures examined, the Gibbs free energy and enthalpy of adsorption were found to be negative and positive, respectively, suggesting that the system is spontaneous and endothermic. According to this study’s findings, methylene blue adsorption onto cobalt oxide nanoparticles happens via the creation of a monolayer, in which the same amount of molecules are adsorbed at two distinct locations. The findings shed light on the methylene blue adsorption process onto cobalt oxide nanoparticles, which have a variety of uses, including the remediation of wastewater.

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Section: Resultsmentioning

confidence: 99%

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

Dehbi,

Dehmani,

Franco

et al. 2024

Molecules

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Improved remediation of contaminated water using ZnO systems via chemical treatment: applications, implications and toxicological mitigation

Osajima¹,

Sá²,

Feitosa³

et al. 2023

Sustain. Water Resour. Manag.

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A comprehensive study on ZrO₂-ZnO nanocomposites synthesized by the plant-mediated green method

Barman

Sikdar²,

Das

2023

Phys. Scr.

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Zirconia – zinc oxide (ZrO2-ZnO) nanocomposites with three different amounts of zirconia (ZrO2) contents (5%, 10%, and 15%) were successfully synthesized using the leaf extract of Azadirachta indica (also known as Neem). The prepared nanocomposites were examined from microstructural and optical point of view. The existence of the mixed phase of hexagonal ZnO together with the tetragonal ZrO2 in each sample was confirmed by the X-ray diffraction data. Rietveld refinement was performed to determine the microstructural parameters. A significant morphological as well as microstructural change was also noticed from SEM and HRTEM images with the admixture of increasing quantities of zirconia. A characteristic metal oxide band within 1000 cm-1, was confirmed by the Fourier transform infrared spectroscopy. UV-Visible spectra confirm the decrease in optical band gap energy values from 3.30 eV to 3.15 eV for the ZnO phase and from 3.93 eV to 3.73 eV for tetragonal ZrO2 phase with the increasing amount of ZrO2 admixture into the ZnO host material. All of these findings would likely be useful not only in the manufacture of electronic and optical devices, but would also be useful for water purification through photocatalytic activities.

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Environmental remediation and synthesis of a new pigment by irradiation-induced adsorption of methylene blue onto undoped tetragonal zirconia

Cited by 3 publications

References 9 publications

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

Improved remediation of contaminated water using ZnO systems via chemical treatment: applications, implications and toxicological mitigation

A comprehensive study on ZrO₂-ZnO nanocomposites synthesized by the plant-mediated green method

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Environmental remediation and synthesis of a new pigment by irradiation-induced adsorption of methylene blue onto undoped tetragonal zirconia

Cited by 3 publications

References 9 publications

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

A Statistical Physics Approach to Understanding the Adsorption of Methylene Blue onto Cobalt Oxide Nanoparticles

Improved remediation of contaminated water using ZnO systems via chemical treatment: applications, implications and toxicological mitigation

A comprehensive study on ZrO2-ZnO nanocomposites synthesized by the plant-mediated green method

Contact Info

Product

Resources

About

A comprehensive study on ZrO₂-ZnO nanocomposites synthesized by the plant-mediated green method