Effect of acidic conditions on decomposition of methylene blue in aqueous solution by air microbubbles

Minamoto, Chihiro; Fujiwara, Nonoka; Shigekawa, Yutaka; Tada, Kaori; Yano, Jun; Yokoyama, Takashi; Minamoto, Yoshikazu; Nakayama, Susumu

doi:10.1016/j.chemosphere.2020.128141

Cited by 35 publications

(23 citation statements)

References 23 publications

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“…The current research has shown this is not an important mechanism under normal operational conditions for ozone treatment (pH 6-8). Some researchers have reported spontaneous •OH generation from collapsing microbubbles but only under specific, strongly acidic conditions for which the mechanism is not fully understood [28,16,13,21]. However, these researchers did not observe • OH generation at slightly acidic, neutral or alkaline pH.…”

Section: Resultsmentioning

confidence: 98%

Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

John

Carra

Jefferson

et al. 2022

Chemical Engineering Journal

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Section: Resultsmentioning

confidence: 98%

Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

John

Carra

Jefferson

et al. 2022

Chemical Engineering Journal

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“…It has several uses, such as staining cells or bacteria for microscopic observation, as an antiseptic and disinfectant, and is also used as a reagent for chemical analysis [ 48 , 49 , 50 , 51 ]. It also has redox indicator properties, since it is blue in an oxidizing environment and loses its color in a reducing environment [ 52 ]. This dye can cause eye burns as well as respiratory problems when inhaled, while when ingested through the mouth it causes burning, nausea, vomiting, deep sweating, mental confusion, and methemoglobinemia [ 53 ].…”

Section: Dyes In Industrial Wastewatermentioning

confidence: 99%

Removal of Dyes by Polymer-Enhanced Ultrafiltration: An Overview

et al. 2021

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The current problem of contamination caused by colored industrial effluents has led to the development of different techniques to remove these species from water. One of them, polymer-enhanced ultrafiltration (PEUF), has been systematically studied in this mini review, in which research works from 1971 to date were found and analyzed. Dye retention rates of up to 99% were obtained in several cases. In addition, a brief discussion of different parameters, such as pH, interfering salts, type of polymer, dye concentration, and membrane type, and their influence in dye removal is presented. It was concluded from the above that these factors can be adapted depending on the pollutant to be remediated, in order to optimize the process. Finally, theoretical approaches have been used to understand the intermolecular interactions, and development of the studied technique. In this revision, it is possible to observe that molecular docking, molecular dynamics simulations, density functional theory calculations, and hybrid neural-genetic algorithms based on an evolutionary approach are the most usual approximations used for this purpose. Herein, there is a detailed discussion about what was carried out in order to contribute to the research development of this important science field.

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“…Joni et al [17] also reported that the application of MiBs in an aquaculture system increased the DO from 4.5 mg L −1 to 7.9 mg L −1 . In addition to their use in aquaculture facilities, MiBs have been used to improve the water quality of wastewater contaminated with various hazardous materials, such as azo dye [18], methylene blue [19], phenol [6,20], palm oil [8], diesel oil [21], trichloroethylene [22], surfactants [3], pesticides [23], and pathogenic bacteria [24]. MiBs have also been used to remove microalgal cells [25] and planktonic crustaceans [26].…”

Section: Introductionmentioning

confidence: 99%

Effective Purification of Eutrophic Wastewater from the Beverage Industry by Microbubbles

Fukami

Oogi

Motomura

et al. 2021

Water

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Beverage industries often discharge large amounts of organic matter with their wastewater. Purification of the effluent is their obligation, but it is nontrivial. Among wastewater components, removal of dissolved organic matter often requires much effort. Therefore, a special effective technique must be considered. Microbubbles (1–100 μm) have several special properties of relevance to wastewater treatment. In this study, the effectiveness of microbubbles for treating and purifying beverage wastewater was evaluated. Orange juice, lactic acid drink, and milk were used as model substrates of dissolved organic matter, and degradation experiments were carried out. Rates of air supply by microbubbles were 0.05% (air/wastewater) min−1. Results indicated that the total organic carbon (TOC) in an experimental vessel containing milk (high nitrogen content) decreased by 93.1% from 11.0 to 0.76 g during a 10-day incubation. The TOC of lactic acid drink (least nitrogen content) decreased by 66.3%, from 15.6 to 5.26 g, and the TOC of orange juice (medium nitrogen content) decreased by 82.7%, from 14.8 to 2.55 g. Large amounts of particulate organic matter floated on the water surface in the milk with microbubbles and were removed easily, while almost no floating materials were observed in the orange juice and lactic acid drink. In contrast, in the macrobubble treatment (diameter 0.1 to 2 mm), only 37.0% of TOC in the milk was removed. Whereas the macrobubble treatments were anaerobic throughout the incubations, the microbubble treatments returned to aerobic conditions quickly, and brought 10 times greater bacterial abundances (>108 cells mL−1). These results suggest that microbubbles are much superior to macrobubbles in supplying oxygen and accelerating the growth of aerobic bacteria, and that wastewater containing more nitrogenous compounds was purified more effectively than that with less nitrogen by microbial degradation and floating separation.

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Effect of acidic conditions on decomposition of methylene blue in aqueous solution by air microbubbles

Cited by 35 publications

References 23 publications

Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

Removal of Dyes by Polymer-Enhanced Ultrafiltration: An Overview

Effective Purification of Eutrophic Wastewater from the Beverage Industry by Microbubbles

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