Effective photocatalytic degradation of Congo red dye using alginate/carboxymethyl cellulose/TiO2 nanocomposite hydrogel under direct sunlight irradiation

Thomas, Molly; Naikoo, Gowhar A.; Sheikh, Mehraj Ud Din; Bano, Mustri; Khan, Farid

doi:10.1016/j.jphotochem.2016.05.005

Cited by 223 publications

(54 citation statements)

References 60 publications

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“…By contrast, the removal ratio of dyes is very low at high pH levels. It is similar to the reports of Zhu et al, Thomas et al, and Paz Diego et al [1, 23, 24]. This phenomenon could be attributed to the properties of dyes and the surface-charge properties of photocatalysts which were related to zero charge.…”

Section: Resultssupporting

confidence: 91%

“…Therefore, the removal efficiency of dye could be enhanced by the lower initial concentration of the dye. This is parallel to the result in Thomas et al’s study [23]. This may be explained that more and more dye molecules were adsorbed on the surface of the photocatalyst, when initial concentration of the dye was increased.…”

Section: Resultssupporting

confidence: 87%

“…However, the sol–gel method exhibits wide application potential not only due to simple operation and mild conditions but also because of the narrow size distribution and excellent crystalline structure of particles synthesized by sol–gel [22]. In recent years, research on ZnO has paid more attention on emphasizing the degradation of a separate azo dye over ZnO [1, 23, 24]. However, the degradation of ZnO for azo dyes containing different azo bonds has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

et al. 2017

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Zinc oxide (ZnO) photocatalysts were synthesized by sol–gel method using zinc acetate as precursor for degradation of azo dyes under UV irradiation. The resultant samples were characterized by different techniques, such as XRD, SEM, and EDX. The influence of preparation conditions such as calcination temperature and composite ratio on the degradation of methyl orange (MO) was investigated. ZnO prepared with a composite ratio of 4:1 and calcination temperature of 400 °C exhibited 99.70% removal rate for MO. The effect of operation parameters on the degradation was also studied. Results showed that the removal rate of azo dyes increased with the increased dosage of catalyst and decreased initial concentration of azo dyes and the acidic condition is favorable for degradation. Furthermore, the kinetics and scavengers of the reactive species during the degradation were also investigated. It was found that the degradation of azo dyes fitted the first-order kinetics and superoxide ions were the main species. The proposed photocatalyst can efficiently and rapidly degrade azo dyes; thus, this economical and environment-friendly photocatalyst can be applied to the treatment of wastewater contaminated with synthetic dyes.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

et al. 2017

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“…Moreover, the results revealed that the modified paper still possessed significant photocatalytic activity after three consecutive cycles of UV illumination, as the degradation efficiency of the modified paper decreased slightly from 32 to 27%. One possible reason for the observed decrement is found in the negative effects of dye accumulation on the pores of paper, which could be responsible for the coverage of catalyst surface: the intensity of light reaching the surface of catalyst nanoparticles was reduced, thus lowering the number of the photogenerated hole−electron pairs [54]. On the other hand, the degradation of paper after its continuous immersion in water could not be ruled out, which could cause the loss of some TiO 2 nanoparticles, and therefore a slight decrease in the photocatalytic efficiency [40,48].…”

Section: Photocatalityc Properties Of Tio 2 -Modified Papermentioning

confidence: 99%

Study of the Effect of Titanium Dioxide Hydrosol on the Photocatalytic and Mechanical Properties of Paper Sheets

Toro

Diab

et al. 2020

Materials

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Different amounts of a stable aqueous TiO2 hydrosol were used to fabricate paper sheets having photocatalytic activity. The TiO2 hydrosol was prepared in aqueous medium using titanium butoxide as precursor and acetic acid as catalyst for the hydrolysis of titanium butoxide. An aging process at room temperature and atmospheric pressure was finally applied to obtain crystalline anatase TiO2 hydrosol. The effects of different TiO2 hydrosol loadings on the mechanical strength and barrier properties of modified paper sheets were investigated in detail. The photocatalytic behavior of TiO2-modified paper sheets was investigated as well using methylene blue (MB) as target pollutant.

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“…It is well known that the photocatalytic activity of nanocatalyst is related to the grain size, specific surface area, adsorption capacity of the sample, and number of surface hydroxyl groups [24][25][26]. By introducing surfactants into the solvothermal system, the photocatalytic activity of TiO 2 was improved in some extent.…”

Section: Characterization Of Photocatalyst the Sem Images Inmentioning

confidence: 99%

Influence of Surfactant on the Morphology and Photocatalytic Activity of Anatase TiO₂ by Solvothermal Synthesis

Wei

Wen

Zhu

2018

Journal of Nanomaterials

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Highly photocatalytically active anatase TiO 2 were synthesized by a solvothermal method using tetrabutyl titanate (TBT), citric acid, and ethanol as row material. The morphology and photocatalytic activity of titanium oxide have changed significantly with the presence of surfactants, such as cetyltrimethylammonium bromide (CTAB), sodium dodecylbenzenesulfonate (SDBS), and diethanolamine (DEA). Scanning electron microscope and X-ray powder diffraction results show that the synthesized products are anatase TiO 2 spherical particles with a micronanostructure. The crystal type of TiO 2 has no obvious change with the addition of different surfactants, but the morphology, size, and dispersion of the TiO 2 particles have changed to some extent. Among the three surfactants, CTAB is beneficial to reduce TiO 2 particle size and improve TiO 2 dispersion and agglomeration. DEA is favor to self-assembly the nanocrystals into spherical particles. Degradation of methyl orange photocatalyzed by TiO 2 prepared with CTAB as surfactant reaches 95.4% under ultraviolet light for 100 min. After five recycles, the catalyst did not exhibit significant loss of photocatalytic activity, confirming that the photocatalyst is essentially stable. This work indicates that the surfactant-assisted solvothermal method is an effective approach to improve the structure, morphology, and photocatalytic performance of TiO 2 . Moreover, the surfactants with various types can interact with the precursors of TiO 2 in different ways.

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Effective photocatalytic degradation of Congo red dye using alginate/carboxymethyl cellulose/TiO2 nanocomposite hydrogel under direct sunlight irradiation

Cited by 223 publications

References 60 publications

Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

Study of the Effect of Titanium Dioxide Hydrosol on the Photocatalytic and Mechanical Properties of Paper Sheets

Influence of Surfactant on the Morphology and Photocatalytic Activity of Anatase TiO₂ by Solvothermal Synthesis

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Effective photocatalytic degradation of Congo red dye using alginate/carboxymethyl cellulose/TiO2 nanocomposite hydrogel under direct sunlight irradiation

Cited by 223 publications

References 60 publications

Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

Preparation of ZnO Photocatalyst for the Efficient and Rapid Photocatalytic Degradation of Azo Dyes

Study of the Effect of Titanium Dioxide Hydrosol on the Photocatalytic and Mechanical Properties of Paper Sheets

Influence of Surfactant on the Morphology and Photocatalytic Activity of Anatase TiO2 by Solvothermal Synthesis

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Influence of Surfactant on the Morphology and Photocatalytic Activity of Anatase TiO₂ by Solvothermal Synthesis