Reduction of Methylene Blue by Using Direct Continuous Ozone

doi:10.7176/jees/10-4-07

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…The MB concentration before and after was measured by UV-Vis Double Beam PC Scanning Auto Cell (UVD-3200, Labomed Inc, United States). The MB calibration curve was constructed from 01; 0.2; 0.5; 1; 2; 5 mg/l at λ = 665 nm [12]. The standard curve equation has the form:…”

Section: Analytical Methods and Calculationmentioning

confidence: 99%

“…Ozone was soaked in 50 mL of 0.2M KI solution for 2 minutes, ozone reacted and reduced the concentration of KI in solution. The output liquid was adjusted to pH from 1-2 with H2SO4 and titrated the excess KI with 0,4 M Na2S2O3 solution until the solution turns from yellow to colorless [12,13]. The mechanism of the titration was described as follows:…”

Section: Analytical Methods and Calculationmentioning

confidence: 99%

“…When increasing the rotational speed from 600 to 1200 rpm, the increasing rate of decolorization efficiency slowed down and almost remained steady, ranging from 98.0 to 99.5%. pH is one of the crucial factors that regulates the quality of the water because pH can determine the rate of reaction of substances in water [12], but at this time, the changing pH less important role due to the presence of a large amount of hydroxyl radicals, which makes the decolorization efficiency faster and stronger.…”

Section: Influence Of Initial Solution Phmentioning

confidence: 99%

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Removal of Methylene Blue Intensified Ozonation Using a High-Performance Rotating Reactor

2023

JST: ETSD

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The advanced oxidation processes (AOPs) were commonly used in textile dyeing wastewater treatment due to its ability to rapidly degrade dyed compounds. However, its disadvantage is the limited dispersion of ozone in wastewater. To minimize the disadvantage, it is necessary to improve the gas-liquid phase contact to maximize the dispersion of ozone in the wastewater body. Therefore, this study investigated the methylene blue (MB) treatment efficiency in textile dyeing wastewater by performing the ozonation process using a high-performance rotating reactor (HP2R) and compared it with the conventional system. The effect of basic operation parameters such as initial pH, initial methylene blue concentration (Co), rotational speed (ω), and the liquid flow rate (QL) on the decolorization efficiency (η) was evaluated. The results showed that the η of the ozonation using the HP2R reached 98% (pH 8) after only 5 minutes, which was 1.8 times higher than that (54%) of conventional ozonation at the identical period. The decolorization efficiency increased with increasing rotational speed (from 82.0 to 92.5% as ω increased from 30 to 1200 rpm), decreasing liquid flow rate (from 98.0 to 74.9% as QL increased from 0.1 to 0.4 l/min) and decreasing initial concentration of MB (from 98.0 to 88.5% as Co increased from 50 to 200 mg/l). These results show that the combined ozonation in the high-gravity technology can be widely applied to various dyeing wastewater treatment processes in general.

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Section: Analytical Methods and Calculationmentioning

confidence: 99%

Section: Analytical Methods and Calculationmentioning

confidence: 99%

Section: Influence Of Initial Solution Phmentioning

confidence: 99%

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Removal of Methylene Blue Intensified Ozonation Using a High-Performance Rotating Reactor

2023

JST: ETSD

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Review on Methylene Blue: Its Properties, Uses, Toxicity and Photodegradation

Khan

Saeed

Zekker

et al. 2022

Water

629

254

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The unavailability of clean drinking water is one of the significant health issues in modern times. Industrial dyes are one of the dominant chemicals that make water unfit for drinking. Among these dyes, methylene blue (MB) is toxic, carcinogenic, and non-biodegradable and can cause a severe threat to human health and environmental safety. It is usually released in natural water sources, which becomes a health threat to human beings and living organisms. Hence, there is a need to develop an environmentally friendly, efficient technology for removing MB from wastewater. Photodegradation is an advanced oxidation process widely used for MB removal. It has the advantages of complete mineralization of dye into simple and nontoxic species with the potential to decrease the processing cost. This review provides a tutorial basis for the readers working in the dye degradation research area. We not only covered the basic principles of the process but also provided a wide range of previously published work on advanced photocatalytic systems (single-component and multi-component photocatalysts). Our study has focused on critical parameters that can affect the photodegradation rate of MB, such as photocatalyst type and loading, irradiation reaction time, pH of reaction media, initial concentration of dye, radical scavengers and oxidising agents. The photodegradation mechanism, reaction pathways, intermediate products, and final products of MB are also summarized. An overview of the future perspectives to utilize MB at an industrial scale is also provided. This paper identifies strategies for the development of effective MB photodegradation systems.

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Reduction of Methylene Blue by Using Direct Continuous Ozone

Cited by 2 publications

References 7 publications

Removal of Methylene Blue Intensified Ozonation Using a High-Performance Rotating Reactor

Removal of Methylene Blue Intensified Ozonation Using a High-Performance Rotating Reactor

Review on Methylene Blue: Its Properties, Uses, Toxicity and Photodegradation

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