Photocatalytic Degradation of Dyes: An Overview

Viswanathan, B.

doi:10.2174/2211544707666171219161846

Cited by 135 publications

(57 citation statements)

References 86 publications

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“…By perceiving these gures, it may be alleged that increasing the concentration of MgO from 1 to 5% visibly promotes the degradation e ciency. This observation has invariably been recorded in literature as the rate growths with catalyst loading but till de nite time above which, the rate of dye degradation slightly decreases with time; as there can be a saturation point beyond which, the solid amount (of dye) could not have a direct correlation to the degradation magnitude (Viswanathan 2018).…”

Section: Ftir Analysissupporting

confidence: 55%

“…These results may be rationalized in terms of adsorption. As the rate of the dye decomposition rests on both the adsorption equilibrium that occurs on the surface and the adsorbed concentration; the solid weight possibly point to the saturation limit of dye adsorption and perhaps restricts the amount of the dye solution that can be engaged with degradation (Viswanathan 2018). Although adsorption is a mandatory for photocatalysis and more adsorption would result in more photocatalysis, the penetration of light, through higher concentration of dye solution, suffers considered di culties (Raliya et al 2017).…”

Section: Ftir Analysismentioning

confidence: 99%

“…Consequently, dye removal has occupied a noticeable position in both research and industry (Viswanathan 2018). The most plentiful compounds (60-70%) in textile wastes are azo dyes (Lellis et al 2019).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Elfadl

El-Sherif

Deghiedy

2021

Preprint

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Practically, 12% of used dyes are excluded as waste in the mobile aqueous environment. Methyl orange (MO), an industrial azo dye, is known to be carcinogenic. Accordingly, this work was engaged to fabrication of a high-efficiency visible light photocatalysts based on Ag-Alginate/Chitosan-coated MgO nanocomposite beads. MgO and Ag were prepared via precipitation and γ-radiation reduction technique as a green physical one, respectively. The degradation mechanisms depended on catalytic reduction by means of sodium borohydride/Ag and photo oxidative degradation. XRD proved the periclase crystalline form of MgO of size 20 nm and the formation of face centered cubic silver crystals of size 15 nm. The degradation yield varied directly with time, MgO and dye concentration until certain limit. Five and twenty minutes were enough to get clear solution of MO (30 and 15 ppm, respectively) while 60 min was required to achieve the same target for 60 ppm MO solution. The catalysts showed high efficiency for MO of high concentration. The incorporation of Ag into catalytic beads could support both mechanisms as it could elevate the degradation efficiency up to 50% and save the time to a great extent. Thus, this carrier fruitfully converted wastewater into an effluent that can be repaid to the water cycle with minimal strike on the ecosystem.

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Section: Ftir Analysissupporting

confidence: 55%

Section: Ftir Analysismentioning

confidence: 99%

See 1 more Smart Citation

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Elfadl

El-Sherif

Deghiedy

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The color waste causes pollution that is toxic to the environment. The waste containing dyes usually consist of non-biodegradable organic compounds that can cause pollution in the environment, especially in the aquatic environment, so that the dye must be oxidized into simpler molecules (Viswanathan, 2018).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of ZnO-Zeolite Nanocomposite for Photocatalytic Degradation by Ultraviolet Light

Gayatri¹,

Agustina²,

Moeksin³

et al. 2021

J. Ecol. Eng.

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The increasing growth of the textile industry does not only provide benefits in the economic sector but also has the potential to damage the environment, because it generates the dye wastewater which is hard to eliminate. Procion red is one of the synthetic textile dyes that is toxic to the aquatic environment and it needs to be processed properly. The photocatalytic method of processing dye wastewater is the most effective, because it can remove the harmful pollutants in the dye wastewater. This study aimed to prepare and characterize the ZnO-Zeolite nanocomposites for photocatalytic applications tested with a 50 mg/L procion red dye sample. The nanocomposites consisted of the ZnO semiconductors and synthetic zeolite adsorbents prepared by using the sol-gel method. The dye degradation test was carried out under the irradiation conditions with ultraviolet (UV) lamp. Apart from the ZnO-Zeolite nanocomposite, testing was also carried out with the synthetic zeolite and ZnO. The results of SEM-EDX and XRD characterization proved that the nanocomposite forming components were ZnO and zeolite and could be seen from the resulting peaks. BET showed that the surface area value of the ZnO-Zeolite nanocomposite increased to 95.98 m 2 /g, the pore size of the ZnO-Zeolite nanocomposite was 4.42 nm, and the total pore volume was 0.08 cm³/g. The obtained average crystalline size of ZnO-Zeolite nanocomposite was 32.87 nm. The percentage of dye degradation using the ZnO-Zeolite nanocomposite for 120 minutes has reached 90.42%.

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“… 4 , 5 An ideal technique to efficiently remove organic dyes from waste water seems to be through a photocatalytic process, which has been eagerly pursued by scientists for decades. 6 In the last years, notable progress has been made in increasing the efficiency of the photocatalysts, but still a number of issues need to be improved such as more profound use of visible solar light, charge carrier recombination, stability of the photocatalysts, and better control of the product selectivity. The most commonly used photocatalysts for dye degradation are inorganic semiconductor nanostructures, that is, titanium dioxide, 7 − 9 zinc oxide, 10 or copper(II) oxide.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide Functionalized with Cationic Porphyrins as Materials for the Photodegradation of Rhodamine B

et al. 2020

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Two noncovalent nanohybrids between cationic porphyrin (free-base TMPyP and zinc(II) ZnTMPyP) bearing cationic ( N -methylpyridyl) groups and graphene oxide (GO) were constructed with the aim of generating a photocatalyst active for rhodamine B (RhB) degradation. The obtained materials were thoroughly characterized by steady-state and time-resolved absorption and emission methods, which indicated that metalation of the porphyrin with Zn(II) increases the affinity of the porphyrin toward the GO surface. Photocurrent experiment together with femtosecond transient absorption spectroscopy clearly showed the existence of electron transfer from the photoexcited porphyrin to GO. Both hybrid materials demonstrated higher photocatalytic activity toward RhB degradation as compared to GO; however, ZnTMPyP–GO exhibited more efficient performance (19% of RhB decomposition after 2 h of irradiation). Our data indicate that the presence of Zn(II) in the core of the porphyrin can promote charge separation in the ZnTMPyP–GO composites. The higher degradation rate seen with ZnTMPyP–GO as compared to the TMPyP–GO assemblies highlights the beneficial role of Zn(II)-metalation of the porphyrin ring.

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Photocatalytic Degradation of Dyes: An Overview

Cited by 135 publications

References 86 publications

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Preparation and Characterization of ZnO-Zeolite Nanocomposite for Photocatalytic Degradation by Ultraviolet Light

Graphene Oxide Functionalized with Cationic Porphyrins as Materials for the Photodegradation of Rhodamine B

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