scholarly journals Application of Green Synthesized Metal Nanoparticles in the Photocatalytic Degradation of Dyes and Its Mathematical Modelling Using the Caputo–Fabrizio Fractional Derivative without the Singular Kernel

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
S. Dave ◽  
A. M. Khan ◽  
S. D. Purohit ◽  
D. L. Suthar
Keyword(s):  
Methyl Orange ◽  
Mathematical Modelling ◽  
Fractional Derivative ◽  
Photocatalytic Degradation ◽  
Ag Nanoparticles ◽  
Iron Nanoparticles ◽  
Experimental Results ◽  
Singular Kernel ◽  
Biological Synthesis ◽  
Degradation Of Dyes

Textile dyes are untreated discharge into the environment which results in a significant increase in water pollution levels worldwide. Due to the continuous addition of toxic organic dyes, a necessary strategic model is required for the complete degradation of dyes in textile effluent. This paper considers the possibility of biological synthesis of silver and iron nanoparticles and their use in photocatalytic degradation. The immediate change of silver nitrate solution occurring from colorless to brown is observed after the addition of the aqueous leaf extract, indicating the successive reduction of Ag+ ions to the Ag nanoparticles. These formed Ag nanoparticles were subjected to examine the photocatalytic activity under the solar radiation for the degradation of methyl orange. Green synthesized Ag nanoparticles were found to successfully degrade methyl orange up to 95% between 70 hours than the initial exposure time. The absorbance of methyl orange was measured at 465 nm. The present paper is focused on fractional mathematical modelling of dye degradation in textile effluents using the Caputo–Fabrizio fractional derivative without the singular kernel. The iterative Laplace transform method is employed to obtain an analytic solution for the absorption transport equation. The obtained experimental results showing significant removal of dyes from textile wastewater are compared using modelling results. The innovative approach is in outstanding agreement with the findings of the experiment. The mathematical modelling for the dye removal process helps to design suitable environmental management studies to reduce the adverse effect caused by toxic wastewater. Model validation has been shown by comparing analytical simulated solutions with experimental results for photocatalytic degradation using silver and iron nanoparticles as eco-friendly and low-cost agents.

scholarly journals Photocatalytic Degradation of Methyl Orange on Bi2O3 and Ag2O-Bi2O3 Nano Photocatalysts

2017 ◽  
Vol 12 (1) ◽  
pp. 96 ◽  
Author(s):  
Seyed Ali Hosseini ◽  
Ramin Saeedi
Keyword(s):  
Methyl Orange ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Average Crystallite Size ◽  
Chemical Precipitation ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Degradation Of Dyes ◽  
Initial Ph ◽  
Degradation Of Methyl Orange

<p>The photocatalytic activity of Bi<sub>2</sub>O<sub>3</sub> and Ag<sub>2</sub>O-Bi<sub>2</sub>O<sub>3</sub> was evaluated by degradation of aqueous methyl orange as a model dye effluent. Bi<sub>2</sub>O<sub>3</sub> was synthesized using chemical precipitation method. Structural analysis revealed that Bi<sub>2</sub>O<sub>3</sub> contain a unique well-crystallized phase and the average crystallite size of 22.4 nm. The SEM analysis showed that the size of Bi<sub>2</sub>O<sub>3</sub> particles was mainly in the range of 16-22 nm. The most important variables affecting the photocatalytic degradation of dyes, namely reaction time, initial pH and catalyst dosage were studied, and their optimal amounts were found at 60 min, 5.58 and 0.025 g, respectively. A good correlation was found between experimental and predicted responses, confirming the reliability of the model. Incorporation of Ag<sub>2</sub>O in the structure of composite caused decreasing band gap and its response to visible light. Because a high percentage of sunlight is visible light, hence Ag<sub>2</sub>O-Bi<sub>2</sub>O<sub>3</sub> nano-composite could be used as an efficient visible light driven photocatalyst for degradation of dye effluents by sunlight. Copyright © 2017 BCREC GROUP. All rights reserved</p><p><em>Received: 15<sup>th</sup> August 2016; Revised: 20<sup>th</sup> December 2016; Accepted: 21<sup>st</sup> December 2016</em></p><p><strong>How to Cite:</strong> Hosseini, S.A., Saeedi, R. (2017). Photocatalytic Degradation of Methyl Orange on Bi<sub>2</sub>O<sub>3</sub> and Ag<sub>2</sub>O-Bi<sub>2</sub>O<sub>3</sub> Nano Photocatalysts. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysi</em>s, 12 (1): 96-105 (doi:10.9767/bcrec.12.1.623.96-105)</p><p><strong>Permalink/DOI:</strong> http://dx.doi.org/10.9767/bcrec.12.1.623.96-105</p><p> </p>

scholarly journals Photocatalytic Degradation of Dyes by TiO2 Process in Batch Photoreactor

2020 ◽  
Vol 9 (4) ◽  
pp. 1502-1512
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Degradation Rate ◽  
Light Sources ◽  
Chemical Contamination ◽  
Degradation Of Dyes ◽  
Effective Option ◽  
Set Up

Chemical contamination in water caused by pollutants is becoming a severe environmental problem. The combination of photocatalysis and solar technologies are a valuable method for water pollution reduction caused by dyeing composites. Therefore, this study aims to determine the effects of operating parameters on the dyes photocatalytic degradation using titanium dioxide (TiO2)-based photocatalyst. Different types of dyes were used in this study, such as methylene blue, congo red, and methyl orange. The different weights of TiO2 were mixed respectively in 500 ml of 10 mg/L dye solutions, which was set up in the photoreactor priorly. Later, the sample extractions were carried and analyzed using a UV-Vis spectrophotometer. The dye removal efficiency was investigated by changing conditions (catalyst dosage, light sources, and aeration). The results showed methylene blue photocatalytic degradation was best with 0.0547 min-1 degradation rate at conditions of 3.0 g/L of TiO2, presence of UVC lamp, and aeration. Congo red photocatalytic degradation was best with 0.0254 min-1 degradation rate at conditions of 1.0 g/L of TiO2, presence of sunlight, and aeration. Methyl orange photocatalytic degradation was best with 0.0094 min-1 degradation rate using 1g/L of TiO2, presence of UVC lamp, and aeration. These findings can be used as an effective option in industrial wastewater treatment.

scholarly journals Efficient photocatalytic degradation of dyes using photo-deposited Ag nanoparticles on ZnO structures: simple morphological control of ZnO

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8709-8717
Author(s):  
Hyeonhan Lim ◽  
Mohammad Yusuf ◽  
Sehwan Song ◽  
Sungkyun Park ◽  
Kang Hyun Park
Keyword(s):  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Ag Nanoparticles ◽  
Morphology Control ◽  
Morphological Control ◽  
Degradation Of Dyes

Morphology control of ZnO structures were fabricated by hydrothermal method with simple adjustments of NaOH concentration and Ag–ZnO composite showed superior photoactivity and recyclability for the degradation of MO and RhB.

Photocatalytic degradation of methyl orange mediated by a silica coated nanomagnet porphyrin hybrid

2021 ◽  
Vol 938 ◽  
pp. 121751
Author(s):  
Kelly A.D.F. Castro ◽  
João M.M. Rodrigues ◽  
M. Amparo F. Faustino ◽  
João P.C. Tomé ◽  
José A.S. Cavaleiro ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Degradation Of Methyl Orange
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