Statistical analysis of the photocatalytic activity of decorated multi-walled carbon nanotubes with ZnO nanoparticles

Roozban, Najmeh; Abbasi, Sedigheh; Ghazizadeh, Mahdieh

doi:10.1007/s10854-016-6280-9

Cited by 54 publications

(11 citation statements)

References 24 publications

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“…Advanced oxidation processing (AOP) which is based on multiply structures photocatalysts has been applied as an alternative method for treatment of contaminated water samples 11 . These approaches are based on platforms with lower cost, nontoxic features, facile operation, higher efficiency and nondestructive properties 13 . Most of the AOP strategies generate hydroxyl radicals that cause the oxidation process and following mineralize organic and inorganic contaminants in water 11 .…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

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Developing a cheap, stable and effective photocatalyst is necessary for remediation of persistent organic pollutants. To address this challenge, we proposed a unique interfacial engineering technique and proper bandgap matching strategy to synthesize MWCNTs/ZnO/Chitosan ternary nanocomposite for effective photocatalytic application. The features of the prepared samples were determined by FESEM, TEM, EDX, elemental mapping, AFM, FT-IR, XRD, UV–Vis spectroscopy and BET surface analysis. The obtained results showed successful fabrication of synthesized nanocomposites with enhanced surface area. Degradation effect of nanostructures on methylene blue (MB) and antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) pathogenic strains were investigated. The proposed photocatalytic mechanism illustrated the electron transfer facilitated by MWCNTs/ZnO/Chitosan structure which results in spatial separation of electron–hole pairs. Compared with ZnO and ZnO/Chitosan, the prepared MWCNTs/ZnO/Chitosan ternary nanocomposite showed high usage of UV illumination and superior separation of photogenerated electron–hole pairs. MWCNTs/ZnO/Chitosan illustrated 86.26% adsorption rate and outstanding increased photocatalytic activity on MB degradation efficiency of 98.76% after 20 min. Stability of photocatalyst reached from 98.76% initial decolorization to 85% at the fourth cycle. In addition, the ternary nanocomposite also exhibited remarkable bactericidal activity against gram-positive (S. aureus) and (B. subtilis) and gram-negative (E. coli) bacteria strains. Due to the obtained results, the prepared nanocomposite would be an efficient candidate photocatalyst with antibacterial properties.

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Section: Introductionmentioning

confidence: 99%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

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“…2. The main characteristic peaks of MWCNTs that is belonged to the (002) and (100) Bragg re ection planes of graphite can be detected at 26.31° and 42.76°, respectively [19,21]. Fig.…”

Section: Xrd Analysismentioning

confidence: 94%

Improvement of photocatalytic decomposition of methyl orange by modified MWCNTs, prediction of degradation rate using statistical models

Abbasi

2021

J Mater Sci: Mater Electron

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Multi-walled carbon nanotubes (MWCNTs) have been successfully modi ed with TiO2 nanoparticles via a two-step hydrolysis technique. Firstly, the pristine MWCNTs are functionalized in nitric acid (HNO3) to creation of oxygen containing groups. Secondly, TiO2 nanoparticles are synthesized on the surface of functionalized MWCNTs through hydrolysis method. The synthesized samples have been used as photocatalyst for decomposition of methyl orange (MO) as dye organic pollutant. The characterization of samples using x-ray diffraction pattern (XRD) con rm the presence of TiO2 nanoparticles with mixture of anatase and rutile phases. Regarding the photocatalytic performance of TiO2 nanoparticles and modi ed MWCNTs with TiO2 nanoparticles, it observed that the degradation rate of MO increases by increasing the irradiation time from 5 min to 35 min. The variation of degradation rate upon pH of suspension reveals that the maximum and minimum degradation rate are in acidic (pH=3) and neutral condition (pH=7). Meanwhile, the results show that the presence of MWCNTs leads to the enhancement of degradation rate. The analysis of variance (ANOVA) results con rm that both of main factors (irradiation time and pH) and their interaction have a signi cant in uence on the degradation rate of MO. However, the effect of irradiation time is more than that of pH and their interaction. The graphical methods verify the quality and adequacy of the statistical models for prediction of the degradation rate.

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“…Meanwhile, it is clear that the degradation rate of MO enhances by increasing the weight fraction of the synthesized MCT #1 and MCT #2. The active surface area of the prepared photocatalysts can be enhanced by increasing the weight fraction of them [8,15]. Therefore, more electrons can migrate from the valence band to the conduction band.…”

Section: The Statistical Analysis Based On Duncan's Multiple Range Testmentioning

confidence: 99%

“…The reported results show that the coupled systems containing applied support and semiconductor have higher photocatalytic performance rather than the semiconductor alone. It can be related to the positive in uence of support on the decrement on recombination rate [14,15]. Multi-walled carbon nanotubes (MWCNTs) are widely applied for preparation of nanocomposites, sensors and nanoelectronics [16,17].…”

Section: Introductionmentioning

confidence: 99%

The Dependence of Photocatalytic Activity on Tio2 to MWCNT Ratio in the Composite

Abbasi

2021

Preprint

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Here, we prepared two kinds of nanocomposites (MCT#1 and MCT#2) involving MWCNTs and TiO2 nanopaerticles. The characterization of the samples is carried out based on FTIR spectroscopy and TEM. The Ti-O groups that is attibuted to the TiO2 nanopaerticles can be confirmed according to the FTIR analysis. TEM images show that the average particle size of TiO2 nanopaerticles in prepare MCT#1 and MCT#2 is equal to 13 nm and 15 nm, respectively. The influence of nanocomposites weight fraction and illumination time are investigated on the decomposition rate of methyl orange (MO) as pollutant. The photocatalytic results exhibit that the decomposition rate of MO is increased with respect to the weight fraction and illumination time. Meanwhile, higher decomposition rate can be observed using MCT#2 compared to MCT#1. Statistical analysis of the results based on Duncan’s multiple range test at α = 0.05 reveals that all of the applied levels of the factors have a significant effect on the decomposition rate. The response surface results confirm that the effect of illumination time is high that that of weight fraction of MCT#1 and MCT#2.

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Statistical analysis of the photocatalytic activity of decorated multi-walled carbon nanotubes with ZnO nanoparticles

Cited by 54 publications

References 24 publications

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Improvement of photocatalytic decomposition of methyl orange by modified MWCNTs, prediction of degradation rate using statistical models

The Dependence of Photocatalytic Activity on Tio2 to MWCNT Ratio in the Composite

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