Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Rodríguez-Chueca, Jorge; Alonso, Enrique; Singh, Devendrá

doi:10.3390/ijerph16020198

Cited by 16 publications

(4 citation statements)

References 41 publications

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“…Chemical and biological processes have been increasingly applied in two major fields: (i) the treatment of wastes and wastewaters pollution, and (ii) the pretreatment of lignocellulosic biomass for further bioconversion [ 42 ]. Among chemical processes, the so-called advanced oxidation process [ 43 , 44 ] has been used to eliminate recalcitrant organic contaminants, while dilute acid hydrolysis has been applied as a pretreatment of lignocellulosic materials [ 14 ]. Among biological processes, WRF incubations under submerged fermentation or SSF and enzymatic processes have gained increased attention both in the field of bioremediation and pollution abatement [ 22 ], as well as for biomass delignification [ 12 , 17 , 18 ].…”

Section: Resultsmentioning

confidence: 99%

Pretreatment of Grape Stalks by Fungi: Effect on Bioactive Compounds, Fiber Composition, Saccharification Kinetics and Monosaccharides Ratio

Fernandes

Fraga

Sousa

et al. 2020

IJERPH

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Grape stalks, an inedible lignocellulosic residue from winemaking and agro-industrial grape juice production, can be valorized as a source of bioactive compounds and as feedstock for the saccharification and bioconversion of soluble sugars. Solid-state fermentation (SSF) by six white-rot fungi was applied as pretreatment. Fiber composition, free radical scavenging activity, four ligninolytic, and three hydrolytic enzyme activities were determined. Saccharification kinetics, yield, and productivity were evaluated and complemented with scanning electron microscopy (SEM), high performance liquid chromatography (HPLC) quantification of monosaccharides, and principal component analysis (PCA). After SSF, the biomass exhibited a drastic free radical scavenging activity decrease and the main enzymes produced were manganese-dependent peroxidase and xylanase. Scanning electron microscopy revealed the erosion of cell walls, and PCA exhibited a negative correlation between saccharification, and neutral detergent fiber and acid detergent lignin. Phlebia rufa pretreated biomass gave the highest sugars yield and productivity, representing a nearly three-fold increase compared to untreated samples. Also, monosaccharides quantification revealed that the 1:1 ratio of glucose to the sum of xylose plus galactose changes to the value of 2:1 after pretreatment. In this work, and for the first time, P. rufa proved to be an effective pretreatment of grape stalks for the saccharification and further bioconversion into value-added chemicals. In addition, lignocellulolytic enzymes were also produced through SSF.

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Section: Resultsmentioning

confidence: 99%

Pretreatment of Grape Stalks by Fungi: Effect on Bioactive Compounds, Fiber Composition, Saccharification Kinetics and Monosaccharides Ratio

Fernandes

Fraga

Sousa

et al. 2020

IJERPH

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“…This fact can be clearly observed in Figure 1A, where the discoloration yields of MB combined with 500 mg/L of PMS were 59% and 100% after 60 min of exposure to UV-A and UV-C radiation, respectively. Although PMS requires prior activation to generate free radicals, its remarkable oxidation potential allows, even in the absence of radiation, the MB to be slightly reduced, namely by 6.5% in 120 min [30]. The removal performance caused by the activation of the PMS is higher under both UV spectra regarding the treatments that did not contain the reagent.…”

Section: Resultsmentioning

confidence: 99%

“…Although PMS activation by Fe 2+ has been widely reported, as well as other iron species and even other types of transition metals [1,[25][26][27][28][29], the generation of sulfate radicals by PMS activation with photocatalysts such as TiO 2 is still poorly explored [30][31][32][33][34]. It seems that a synergistic effect occurs when PMS and TiO 2 are coupled, and the most feasible mechanism is the decomposition of PMS by TiO 2 , while photolysis of PMS can enhance the reactivity of TiO 2 and inhibit the recombination of the electron-hole pair by trapping photoinduced electrons [35,36].…”

Section: Introductionmentioning

confidence: 99%

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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The increase in world population and human activities are leading to an increase in water stress in many regions of the planet, coupled with a decrease in the quality of water bodies. Advanced oxidation processes have demonstrated great potential for the reduction of almost any organic pollutant; however, it is necessary to intensify this type of treatment in order to reduce contact times and to reach a greater number of pollutants. The generation of sulfate radicals by activation of peroxymonosulfate (PMS) by divalent iron (Fe2+) and/or titanium dioxide (TiO2) were statistically studied to understand the role of these compounds as activators, using methylene blue as target pollutant because of its ease of handling and analysis. A factorial experimental design was used to study the influence of different variables (PMS, Fe2+, and TiO2) in the presence of UV-A or UV-C. There were relevant differences in the discoloration of methylene blue when analyzing the size of the effects and significance of the experiments, when UV-A or UV-C was used, being faster with UV-C. For instance, total discoloration of methylene blue was reached after 60 min with the system PMS/UV-C, while after 90 min only the 59% of methylene blue disappeared in presence of PMS/UV-A. Both Fe2+ and TiO2 in combination with PMS and UV increased the discoloration effect. So, in the presence of Fe2+, total discoloration of methylene blue was observed after 30 min in presence of UV-A, while this yield was reached in 7.5 min under UV-C. In the case of PMS/TiO2, it required 60 min under UV-A radiation to totally remove methylene blue, and around 15 min with UV-C. Statistically, the three variables were observed to have the main effect in combination with UV. Furthermore, the PMS/Fe2+ system has a significant interaction with UV-A and UV-C radiation, while the interaction of PMS/TiO2 was significant under UV-A, but with a negative effect under UV-C, or in other words the high elimination rates observed are achieved by the oxidation potential of UV-C, and the effect of PMS and TiO2 by itself.

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“…In the photo Fenton process, the ( ) is the photo active species which is responsible for photocatalytic degradation [6,7].…”

Section: Advanced Oxidation Processmentioning

confidence: 99%

Degradation of Congo Red Dye Using Homogeneous Photo Fenton Catalyst Coupled with Oxygen Kinetics and Statistical Analysis

Molla-Babaker

Idreesb

2020

AJACR

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Experimental design DoE (box behnken design BBD) and statistical analysis approaches were employed to determine the effect of Congo red dye (C.R) concentration, photo catalyst dose (Fe+2) and follow of oxygen gas as an oxidant on the degradation of C.R. The results show that the concentration oppositely affects the degradation yield whereas the remaining two factors show positive effect, throughout all experiments oxygen molecule shows crucial role in their positive effect with p-value about 0.01 which is very significant value. The accepted regression model was linear with significance p-value 0.032 that mean all factors show good agreement in linear relationship and the interactions was not important. Degradation kinetics was also applied to investigate the effect of increasing dye concentration on degradation rate constant with and without photo catalyst dose and oxidant (O2). It appears that the degradation of peak at 498nm is second order The result was in good agreement with that of statistical analysis that are 0.0435, 0.0545 and 5.4 M- min- with photo catalysis 12, 8 and 4 PPM dye, 4O2 mL/min,20PPM Fe+2 respectively, in case without photocatalyst the results were 0.0025 and 0.0207 M- min-with 12 and 4 PPM in turn.

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Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Cited by 16 publications

References 41 publications

Pretreatment of Grape Stalks by Fungi: Effect on Bioactive Compounds, Fiber Composition, Saccharification Kinetics and Monosaccharides Ratio

Pretreatment of Grape Stalks by Fungi: Effect on Bioactive Compounds, Fiber Composition, Saccharification Kinetics and Monosaccharides Ratio

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Degradation of Congo Red Dye Using Homogeneous Photo Fenton Catalyst Coupled with Oxygen Kinetics and Statistical Analysis

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