Effect of operational parameters on the photocatalytic degradation of Methylene blue dye solution using manganese doped ZnO nanoparticles

Chanu, L. Anju; Singh, Wazir; Singh, K. B.; Devi, K. Nomita

doi:10.1016/j.rinp.2018.12.089

Cited by 194 publications

(27 citation statements)

References 48 publications

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“…The presence of these two regions can be interpreted if we consider that the MB photocatalytic discoloration involves the steps described below [66,67]: The mechanism can be explained based on the peculiarity of our photocatalytic measurements. Generally, the investigation regarding the degradation of a dye in the presence of a photocatalyst in powder form is performed in an aqueous solution.…”

Section: Resultsmentioning

confidence: 98%

“…Further, the photocatalytic activity of the pristine ZnO and ZnO-CdS composite powders was evaluated, the measurements being made on MB under UV illumination. Although, the discoloration rate was usually determined by a pseudo-first order linear regression corresponding to a simple first-order reaction model [66,67], the experimental curves shown in Figure 6 reveal two linear regions; the reaction rate constant values for each of them are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

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Cytotoxicity, Antioxidant, Antibacterial, and Photocatalytic Activities of ZnO–CdS Powders

et al. 2020

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In this work, ZnO–CdS composite powders synthesized by a simple chemical precipitation method were thoroughly characterized. The morphological, structural, compositional, photocatalytical, and biological properties of the prepared composites were investigated in comparison with those of the pristine components and correlated with the CdS concentration. ZnO–CdS composites contain flower-like structures, their size being tuned by the CdS amount added during the chemical synthesis. The photocatalytic activity of the composites was analyzed under UV irradiation using powders impregnated with methylene blue; the tests confirming that the presence of CdS along the ZnO in composites can improve the dye discoloration. The biological properties such as antioxidant capacity, antibacterial activity, and cytotoxicity of the ZnO, CdS, and ZnO–CdS composites were evaluated. Thus, the obtained composites presented medium antioxidant effect, biocidal activity against Escherichia coli, and no toxicity (at concentrations less than 0.05 mg/mL for composites with a low CdS amount) for human fibroblast cells. Based on these results, such composites can be used as photocatalytic and/or biocidal additives for photoactive coatings, paints, or epoxy floors, which in their turn can provide a cleaner and healthier environment.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Cytotoxicity, Antioxidant, Antibacterial, and Photocatalytic Activities of ZnO–CdS Powders

et al. 2020

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“…The fastest photodegradation was obtained in the case of Sample S2. The presence of the three linear regions in Figure 7a can be explained if we consider that the RhB photocatalytic degradation was made in three steps according to the following stages shown in Scheme 1 [33,34]: The reaction rate constant values for each sample (k 1 , k 2 , and k 3 ) and the corresponding linear regression coefficients (R 2 1 , R 2 2 , and R 2 3 ) are presented in Table 2. From Table 2, it can be observed that the rate constants increased with SWNT concentration up to the k value of 0.0055 min −1 in the case of 2.5 wt.% SWNTs, which was due to a higher loading of carbon nanotubes onto the TiO 2 :N nanoparticle surface.…”

Section: The Dependence Of the Rhb Photodegradation On Cnt Concentrations In Tio2:n/swnt Samplesmentioning

confidence: 99%

Section: The Dependence Of the Rhb Photodegradation On Cnt Concentrations In Tio2:n/swnt Samplesmentioning

confidence: 99%

Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites

et al. 2021

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In this work, new results concerning the potential of mixtures based on nitrogen doped titanium dioxide (TiO2:N) and carbon nanotubes (CNTs) as possible catalyst candidates for the rhodamine B (RhB) UV photodegradation are reported. The RhB photodegradation was evaluated by UV–VIS absorption spectroscopy using samples of TiO2:N and CNTs of the type of single-walled carbon nanotubes (SWNTs), double-wall carbon nanotubes (DWNTs), multi-wall carbon nanotubes (MWNTs), and single-walled carbon nanotubes functionalized with carboxyl groups (SWNT-COOH) having various concentrations of CNTs. The best photocatalytic performance was obtained for sample containing TiO2:N and 2.5 wt.% SWNTs-COOH, when approx. 85% of dye removal was achieved after 300 min. of UV irradiation. The reaction kinetics of RhB aqueous solutions containing TiO2:N/CNT mixtures followed a complex first-order kinetic model. The TiO2:N/CNTs catalyst induced higher photodegradation efficiency of RhB than TiO2:N due to the presence of CNTs, which act as adsorbent and dispersing agent and capture the photogenerated electrons of TiO2:N hindering the electron–hole recombination.

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“…A comparison of the degradation efficiencies of the as-synthesized ZnO nanostructures with similar materials reported in the literature is shown in Table S5 . 70 − 74 Although the rates are better in the literature reports, the present work shows a simple route to get variation in the dimensionality and solubility of the as-synthesized nanostructures using water-soluble 1D CPs, which is exceptional. We have also shown a correlation between the surface area of three different nanostructures and the degradation rates through this systematic study.…”

Section: Resultsmentioning

confidence: 76%

Precursor- and Time-Dependent Morphological Evolution of ZnO Nanostructures for Comparative Photocatalytic Activity and Adsorption Dynamics with Methylene Blue Dye

Thakur

Mandal

2020

ACS Omega

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Diverse ZnO nanostructures were successfully fabricated at 700 °C by direct annealing of 1D Zn(II) coordination polymer precursors, namely, [Zn 2 (bpma) 2 (adc) 2 ] n , [Zn 2 (bpea) 2 (adc) 2 ] n , and {[Zn 2 (bpta) 2 (adc) 2 ]·2H 2 O} n . The effect of sacrificial ligands present in the precursors as well as a variation in the retention time (6–24 h) during their synthesis resulted in 0D nanospheres, 1D microrods, and 3D polyhedra (with a diamond-like structure) of ZnO. The as-synthesized ZnO nanostructures were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, diffuse reflectance spectroscopy, and Raman spectroscopy. The hexagonal crystal structure was confirmed for all the ZnO samples. A lattice spacing of 0.22 nm has been observed for nanospheres, whereas a lattice spacing of 0.26 nm has been observed for the polyhedra. Their Raman spectra confirm the wurtzite phase of ZnO. UV–vis spectra of ZnO nanostructures exhibit broad peaks in the range of 350–370 nm, and the band gap energies are found to be in the range of 3.02–3.20 eV. Based on the photoluminescence spectra photocatalytic activities of the as-synthesized ZnO nanostructures calcined for 12 h were tested with methylene blue (MB) as a contaminant in an aqueous solution. These results demonstrate that the photocatalytic efficiency of polyhedra is higher than those of nanospheres and microrods. The adsorption kinetics of MB dye by these nanostructures were studied by three different kinetic models—Elovich’s, intraparticle, and pseudo-second-order. The maximum rate of adsorption was observed with the intraparticle diffusion model.

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Effect of operational parameters on the photocatalytic degradation of Methylene blue dye solution using manganese doped ZnO nanoparticles

Cited by 194 publications

References 48 publications

Cytotoxicity, Antioxidant, Antibacterial, and Photocatalytic Activities of ZnO–CdS Powders

Cytotoxicity, Antioxidant, Antibacterial, and Photocatalytic Activities of ZnO–CdS Powders

Rhodamine B Photodegradation in Aqueous Solutions Containing Nitrogen Doped TiO2 and Carbon Nanotubes Composites

Precursor- and Time-Dependent Morphological Evolution of ZnO Nanostructures for Comparative Photocatalytic Activity and Adsorption Dynamics with Methylene Blue Dye

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