One step synthesis of vertically grown Mn-doped ZnO nanorods for photocatalytic application

Raskar, N. D.; Dake, D. V.; Mane, V. A.; Σταθάτος, Ηλίας; Deshpande, Uday; Dole, B. N.

doi:10.1007/s10854-019-01433-7

Cited by 40 publications

(23 citation statements)

References 51 publications

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“…9a, b. It is noted that the photodegradation of methylene blue follows pseudo-first-order kinetics, which is given below [12], (6) log…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…Therefore 4% Mn-doped ZnO sample is a promising candidature for photocatalytic degradation under visible light irradiation and functions effectively ( Table 2). Fluorescence spectroscopy and BET surface defect study results were supplied in ESI [12,[44][45][46].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…To improve the photocatalytic activity of ZnO in visible radiation, it is necessary to either reduce its band gap or introduce intermediate donor levels with the doping of transition metals. In our preceding publication, we have reported work on nanorods [12] but in the present work, we have prepared nanoflowers because they are highly reactive than nanorods due to their high surface area actively participated in photocatalytic reaction. The doping of transition metals namely Mn, Ni, Ag, Cu, Co, La, Ce, Au, etc.…”

Section: Introductionmentioning

confidence: 99%

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Development of oxygen vacancies and surface defects in Mn-doped ZnO nanoflowers for enhancing visible light photocatalytic activity

et al. 2020

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Pure and Mn-doped ZnO nanoflowers were successfully synthesized by the hydrothermal technique. Doping of Mn into ZnO lattice exhibits formation of oxygen vacancies and surface modifications into ZnO lattice was investigated by XPS spectra and AFM analysis. During the photocatalytic performance, vacancies create the trap centers for photogenerated electrons hence the electron-hole recombination is effectively inhibited. These formed oxygen vacancies along with enhanced surface area are due to Mn doping, resulted in effective photodegradation of methylene blue solution under solar light irradiation. The degradation efficiency for methylene blue dye exceeds 82% after 120 min under solar light irradiation, also the catalytic performance of Mn-doped ZnO nanoflowers retains even after 4 cycles.

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“…9a, b. It is noted that the photodegradation of methylene blue follows pseudo-first-order kinetics, which is given below [12], (6) log…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Section: Photocatalytic Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of oxygen vacancies and surface defects in Mn-doped ZnO nanoflowers for enhancing visible light photocatalytic activity

et al. 2020

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“…Also, these materials are dispersible in solvents allowing their easy processing and they can provide surface functionality adapted to the desired applications. Several studies have been focused on photocatalytic activity for the degradation and removal of different pollutants using distinct semiconductor materials likeTiO2 (Hashimoto et al 2005), ZnO (Raskar et al 2019),ZnS (Raskar et al 2019),CdS (Zhao et al 2007), SnO2 (Cheng et al 2018) and GO-based composites (Han et al 2018).CdSe is a ntype semiconductor with a band gap in the visible range (1.65-1.8 eV) (Lo et al 2004;Kotkata et al 2009)and it has received numerous applications in labeling (Wang et al 2011), sensors (Huang et al 2008), optometric devices (Jung et al 2008),solar cells (Yang et al 2011;Im et al 2010) and photocatalysis (Lo et al 2004).Although it has been widely used for biological applications, its immobilization on a solid support for photocatalytic applications has not been explored extensively.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and photocatalytic degradation of an industrial azo dye using colloidal semiconductor nanocrystals

Mohamed

Ouni

Bouzid

et al. 2022

Preprint

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In this study, mercaptosuccinic acid capped CdSe nanocrystals was successfully synthesized by in-situ medium colloid and used as photocatalyst for the effective photodegradation of methylene blue from aqueous solution under visible light and sunlight irradiations. The particle size and the crystal structure of these nanocrystals were analyzed by different analytical techniques. Dye adsorption prior to photocatalysis using these nanomaterials was studied via the experimental quantification of kinetics and isotherms. These experimental data were modeled including the application of statistical physics theory to analyze the corresponding adsorption mechanism. A maximum adsorption capacity of 27.1 mg/g (80% of dye removal) was observed in 10 min using an initial concentration of 30 mg/L. Statistical physics calculations indicated that the adsorption energy was lower than 40 kJ/mol. It was also established that the dye adsorption was associated to the electrostatic interactions and hydrogen bonding. Overall, the dye removal was a spontaneous, feasible and exothermic process. Adsorption properties of CdSe-MSA nanocrystals improved the dye photodegradation efficiency under visible light thus achieving up to 80% degradation in 60 min. The synergic effect of adsorption and photocatalytic degradation performance was mainly due to the surface area, small size (3.7 nm) and structural defects (selenium vacancies Se, interstitial of cadmium ICd) of nanocrystals, which enhanced the response of these nanomaterials inside the visible range for the photocatalytic activity. In summary, these nanocrystals are promising materials to be used in wastewater treatment under sunlight for the removal of organic compounds like dyes.

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“…Several studies have been focused on photocatalytic activity for the degradation and removal of different pollutants using distinct semiconductor materials likeTiO2 (Hashimoto et al 2005) , ZnO (Raskar et al 2019) ,ZnS (Raskar et al 2019) ,CdS (Zhao et al 2007) , SnO2 (Cheng et al 2018) and GO-based composites (Han et al 2018).CdSe is a n-type semiconductor with a band gap in the visible range (1.65-1.8 eV) (Lo et al 2004;Kotkata et al 2009)and it has received numerous applications in labeling (Wang et al 2011) , sensors (Huang et al 2008), optometricdevices (Jung et al 2008) ,solarcells (Yang et al 2011;Im et al 2010) and photocatalysis (Lo et al 2004).Although it has been widely used for biological applications, its immobilization on a solid support for photocatalytic applications has not been explored extensively.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Photocatalytic Degradation of an Industrial Azo Dye Using Colloidal Semiconductor Nanocrystals

Mohamed

Ouni

Bouzid

et al. 2021

Preprint

View full text Add to dashboard Cite

In this study, mercaptosuccinic acid capped CdSe nanocrystals was successfully synthesized by in-situ medium colloid and used as photocatalyst for the effective photodegradation of methylene blue from aqueous solution under visible light and sunlight irradiations.The particle size and the crystal structure of these nanocrystals were analyzed by different analytical techniques. Dye adsorption prior to photocatalysis using these nanomaterials was studied via the experimental quantification of kinetics and isotherms. These experimental data were modeled including the application of statistical physics theory to analyze the corresponding adsorption mechanism. A maximum adsorption capacity of 27.1 mg/g (80% dye removal) was observed in 10 min using an initial concentration of 30 mg/L. Statistical physics calculations indicated that the adsorption energy was lower than 40 kJ/mol. Itwas also established that the dye adsorption was associated to the electrostatic interactions and hydrogen bonding. Overall, the dye removal was a spontaneous, feasible process and exothermic. Adsorption properties of CdSe-MSA nanocrystals improved the dye photodegradation efficiency under visible light thus achieving up to 80% degradation in 60 min. The synergic effect of adsorption and photocatalytic degradation performance was mainly due to the surface area, small size (3.7 nm) and structural defects (selenium vacancies Se, interstitial of cadmium ICd), which enhanced the response of these nanomaterials inside the visible range for the photocatalytic activity. In summary, these nanocrystals are promising materials to be used in wastewater treatment under sun light for the removal of organic compounds like dyes.

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One step synthesis of vertically grown Mn-doped ZnO nanorods for photocatalytic application

Cited by 40 publications

References 51 publications

Development of oxygen vacancies and surface defects in Mn-doped ZnO nanoflowers for enhancing visible light photocatalytic activity

Development of oxygen vacancies and surface defects in Mn-doped ZnO nanoflowers for enhancing visible light photocatalytic activity

Adsorption and photocatalytic degradation of an industrial azo dye using colloidal semiconductor nanocrystals

Adsorption and Photocatalytic Degradation of an Industrial Azo Dye Using Colloidal Semiconductor Nanocrystals

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