Photocatalytic degradation of methylene blue using TiO2 supported in ceramic material

The present work evaluates the use of ceramic material, produced with the aid of industrial waste through the Gel-Casting method, as a support for catalysts in the photocatalytic degradation of Methylene Blue. The analysis was carried out in a reactor containing UVC lamps through batch processing. The results show that the reaction of photocatalytic degradation of the dye presents pseudo-first order kinetics, with values of degradation between 60 and 70 %. The study evaluated the deactivation of the catalysts synthesized and supported in the ceramic material. In this case, it was observed that the larger the mass of deposited catalyst on the ceramic support, the longer the lifespan of the sample, since a larger mass takes longer to deactivate.

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Chemical effects induced by gas–liquid jet flow

Reaction Chemistry & Engineering ◽

10.1039/d1re00519g ◽

2022 ◽

Author(s):

Zhiliang Zhang ◽

Jiaqi Lu ◽

Bingqian Lv ◽

Wei Liu ◽

Shuyuan Shen ◽

...

Keyword(s):

Methylene Blue ◽

Jet Flow ◽

Reaction Process ◽

Liquid Jet ◽

First Order ◽

First Order Kinetics ◽

Chemical Effects ◽

Pseudo First Order

The gas-liquid jet flow was proved to be capable of inducing chemical consequences which can lead to the decomposition of methylene blue (MB). The reaction process follows a pseudo-first-order kinetics....

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Photocatalytic Degradation of Acrylic Acid, Acrolein and Hydroquinone Using TiO2 under Simulated Solar Irradiation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.781-784.2129 ◽

2013 ◽

Vol 781-784 ◽

pp. 2129-2132 ◽

Cited By ~ 2

Author(s):

Yan Wen Gong ◽

Xue Ni Cheng ◽

Hong Xun Zhang

Keyword(s):

Acrylic Acid ◽

Photocatalytic Degradation ◽

Nitrogen Doping ◽

Solar Irradiation ◽

First Order ◽

First Order Kinetics ◽

Pseudo First Order ◽

Simulated Solar Irradiation

Nitrogen doping TiO2was prepared and used to degrade acrolein wastewater under simulated solar irradiation acrylic acid. The results showed that the removal of acrolein, hydroquinone and acrylic acid were 0.73, 0.64, 0.26 after 4 hour degradation by TiO2/UV system. The degradation of acrolein, hydroquinone and acrylic acid using TiO2/UV system followed pseudo first-order kinetics. It results indicated that this proposed method can be useful for the pretreatment acrolein wastewater.

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Decolourization of Methylene Blue by Persulfate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.76 ◽

2013 ◽

Vol 634-638 ◽

pp. 76-80

Author(s):

Wei Hu ◽

Shen Xin Li ◽

Cheng Duan Wang

Keyword(s):

Methylene Blue ◽

Ionic Strength ◽

Uv Irradiation ◽

Reaction Temperature ◽

Uv Light ◽

Kinetics Model ◽

Dye Wastewater ◽

First Order ◽

First Order Kinetics ◽

Pseudo First Order

The decolourization of dye wastewater by persulfate was studied using methylene blue as a model dye wastewater. Effects of several parameters, such as dose of oxidant, ionic strength, pH, temperature and UV irradiation, were investigated in detail. The results showed that the decolourization reaction of methylene blue by persulfate could be fitted to a pseudo-first order kinetics model. In addition, when the oxidant amount used is 2 times of methylene blue, pH 3.43 and reaction temperature for 60°C, after uv light under the irradiation of 20 min, methylene blue decolorization rate can reach more than 98%. The results are useful for the treatment of dye wastewater.

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Photocatalytic Degradation of Erythrosin-B using Cadmium Cobaltite for Water Reuse: Efficiency and Degradation Pathway

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22713 ◽

2020 ◽

Vol 32 (9) ◽

pp. 2143-2148

Author(s):

JAYANTI SAMOTA ◽

SURAJ SHARMA ◽

SHIPRA BHARDWAJ ◽

KUMUD INTODIA

Keyword(s):

Photocatalytic Degradation ◽

Water Reuse ◽

Reaction Rate ◽

Degradation Pathway ◽

Photochemical Degradation ◽

Erythrosin B ◽

First Order ◽

First Order Kinetics ◽

Pseudo First Order ◽

The Impact

In present work, a photocatalytic degradation of Erythrosin-B has been studied using cadmium cobaltite. The impact of different parameters such as pH, amount of cadmium cobaltite, concentration of Erythrosin-B and light intensity have been observed on the reaction rate. Radical quenching experiments revealed that hydroxyl radicals are primarily responsible for the degradation of Erythrosin-B. The progress of reaction monitored spectrophotometrically and it followed pseudo first-order kinetics. An experimental mechanism is proposed for the photochemical degradation of Erythrosin-B.

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Facile Synthesis of Flower-Like TiO2-Based Composite for Adsorption–Photocatalytic Degradation of High-Chroma Methylene Blue

Catalysts ◽

10.3390/catal11040515 ◽

2021 ◽

Vol 11 (4) ◽

pp. 515

Author(s):

Mengqi Tian ◽

Jingjing Wang ◽

Runjun Sun ◽

Mu Yao ◽

Lianbi Li

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Photoluminescence Intensity ◽

Facile Synthesis ◽

First Order ◽

Degradation Data ◽

First Order Kinetics ◽

Hydrochloric Acid Treatment ◽

Pseudo Second Order ◽

Facile Fabrication

A flower-like TiO2-based composite (denoted as Zn-Ti-6) was prepared using a flower-like zinc oxide template for adsorption–photocatalytic degradation of high-chroma methylene blue. The reaction took place in an alkaline environment following hydrochloric acid treatment to remove the template and form TiO2-based composite. Sodium hydroxide played both roles of morphology-directing agent and reactive etchant. The possible mechanism for the formation of flower-like Zn-Ti-6 was proposed. The adsorption and photocatalytic degradation behavior of Zn-Ti-6 on methylene blue (MB) removal was also investigated. The results revealed that Zn-Ti-6 showed better adsorption and photocatalytic degradation performance than TiO2 nanoparticles owing to its much larger specific surface area, more abundant hydroxyls, and lower photoluminescence intensity. The adsorption and photocatalytic degradation data of Zn-Ti-6 were well fitted to the pseudo-second-order and pseudo-first-order kinetics models, respectively. The excellent adsorption performance of Zn-Ti-6 is largely beneficial to the subsequent photocatalytic degradation performance for high-chroma wastewater treatment. Overall, this study contributes a facile fabrication strategy for flower-like TiO2-based composite to achieve the adsorption–photocatalytic degradation of high-chroma wastewater.

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Rapid photocatalytic degradation of methylene blue, tartrazine and brilliant green dyes by high-flux UV irradiation photolysis reactor

Bulgarian Chemical Communications ◽

10.34049/bcc.51.3.4683 ◽

2019 ◽

Vol 51 (3) ◽

pp. 337-341

Author(s):

R. Rehman ◽

W. Uz-Zaman ◽

A. Abbas ◽

L. Mitu

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Brilliant Green ◽

Dye Degradation ◽

High Flux ◽

Optimal Result ◽

First Order ◽

First Order Kinetics ◽

Degradation Of Dyes ◽

Uv Visible

The aim of this work was to investigate the removal of dyes from wastewater by photocatalytic degradation using a modified assembly of photolysis reactor. It was more efficient and dye degradation occurred very fast. UV/Visible spectrophotometry was used to monitor the reaction. The degradation of dyes with different catalysts was compared and found to follow first-order kinetics. The optimal result for Methylene Blue was t(1/2)=4 min, k = 0.4471 min-1, R2 = 0.9650, for Tartrazine - t(1/2) = 1.2 min, k = 0.9723 min-1, R2 = 0.9980 and for Brilliant Green - t(1/2) = 0.8 min, k = 0.9716 min-1, R2 = 0.9938. So, it can be efficiently employed on a larger scale. Keywords: Methylene Blue, Tartrazine, Brilliant Green, Photolysis, Degradation.

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In-vitro Kinetic Hydrolysis Study of Metronidazole Derivatives with Carvacrol and Eugenol Using Validated RP-HPLC Method

Current Pharmaceutical Analysis ◽

10.2174/1573412916999200529123151 ◽

2020 ◽

Vol 16 ◽

Author(s):

M. Alarjah

Keyword(s):

Half Life ◽

Hplc Method ◽

Hydrolysis Rate ◽

First Order ◽

First Order Kinetics ◽

Rp Hplc ◽

Pharmacokinetic Properties ◽

Pseudo First Order ◽

Kinetic Hydrolysis

Background: Prodrugs principle is widely used to improve the pharmacological and pharmacokinetic properties of some active drugs. Much effort was made to develop metronidazole prodrugs to enhance antibacterial activity and or to improve pharmacokinetic properties of the molecule or to lower the adverse effects of metronidazole. Objective: In this work, the pharmacokinetic properties of some of monoterpenes and eugenol pro metronidazole molecules that were developed earlier were evaluated in-vitro. The kinetic hydrolysis rate constants and half-life time estimation of the new metronidazole derivatives were calculated using the validated RP-HPLC method. Method: Chromatographic analysis was done using Zorbbax Eclipse eXtra Dense Bonding (XDB)-C18 column of dimensions (250 mm, 4.6 mm, 5 μm), at ambient column temperature. The mobile phase was a mixture of sodium dihydrogen phosphate buffer of pH 4.5 and methanol in gradient elution, at 1ml/min flow rate. The method was fully validated according to the International Council for Harmonization (ICH) guidelines. The hydrolysis process carried out in an acidic buffer pH 1.2 and in an alkaline buffer pH 7.4 in a thermostatic bath at 37ºC. Results: The results followed pseudo-first-order kinetics. All metronidazole prodrugs were stable in the acidic pH, while they were hydrolysed in the alkaline buffer within a few hours (6-8 hr). The rate constant and half-life values were calculated, and their values were found to be 0.082- 0.117 hr-1 and 5.9- 8.5 hr., respectively. Conclusion: The developed method was accurate, sensitive, and selective for the prodrugs. For most of the prodrugs, the hydrolysis followed pseudo-first-order kinetics; the method might be utilised to conduct an in-vivo study for the metronidazole derivatives with monoterpenes and eugenol.

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New insights on the UV/TiO2 photocatalytic treatment of thiomersal and its 2-sulfobenzoic acid product

Journal of Photocatalysis ◽

10.2174/2665976x02666210629104521 ◽

2021 ◽

Vol 02 ◽

Author(s):

Emmanuel M. de la Fournière ◽

Jorge M. Meichtry ◽

Graciela S. Custo ◽

Eduardo A. Gautier ◽

Marta I. Litter

Keyword(s):

Degradation Products ◽

Acidic Ph ◽

Cosmetic Products ◽

Acid Product ◽

First Order ◽

First Order Kinetics ◽

Photocatalytic Destruction ◽

Pseudo First Order ◽

Mineralization Degree ◽

Suitable Technique

Background: Thiomersal (TM), a complex between 2-mercaptobenzoic acid (2-MBA) and ethylmercury (C2H5Hg+), is an antimicrobial preservative used in immunological, ophthalmic, cosmetic products, and vaccines. Objective: TM has been treated by UV/TiO2 photocatalysis in the presence or absence of oxygen at acidic pH. C2H5Hg+, 2-MBA, and 2-sulfobenzoic acid (2-SBA) were found as products. A 2-SBA photocatalytic treatment was undertaken to study sulfur evolution. Methods: Photocatalytic runs were performed using a UVA lamp (λmax = 352 nm), open to the air or under N2. A suspension of the corresponding TM or 2-SBA salt and TiO2 was prepared, and pH was adjusted. Suspensions were stirred in the dark for 30 min and then irradiated. TM, 2-MBA, 2-SBA, and C2H5Hg+ were quantified by HPLC, sulfur by TXRF, and the deposits on the photocatalyst were analyzed by chemical reactions. The mineralization degree was followed by TOC. Sulfate was determined using BaCl2 at 580 nm. Results: Photocatalytic destruction of TM and total C2H5Hg+ was complete under N2 and air, but TM degradation was much faster in air. The evolution of TM and the products followed a pseudo-first-order kinetics. Conclusion: TiO2-photocatalytic degradation is a suitable technique for the treatment of TM and its degradation products. In contrast to other organomercurial compounds, TM degradation is faster in the presence of O2, indicating that the oxidative mechanism is the preferred pathway. A significant TM mineralization (> 60%, NPOC and total S) was obtained. TM was more easily degraded than 2-SBA. Sulfate was the final product.

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Photocatalytic degradation of indigo carmine by ZnO photocatalyst under visible light irradiation

Baghdad Science Journal ◽

10.21123/bsj.14.3.582-587 ◽

2017 ◽

Vol 14 (3) ◽

pp. 582-587

Author(s):

Baghdad Science Journal

Keyword(s):

Zinc Oxide ◽

Photocatalytic Degradation ◽

Indigo Carmine ◽

Catalyst Loading ◽

Order Kinetic ◽

Kinetic Reaction ◽

First Order ◽

Pseudo First Order ◽

The Relationship ◽

Influential Parameters

In this work, the photocatalytic degradation of indigo carmine (IC) using zinc oxide suspension was studied. The effect of influential parameters such as initial indigo carmine concentration and catalyst loading were studied with the effect of Vis irradiation in the presence of reused ZnO was also investigated. The increased in initial dye concentration decreased the photodegradation and the increased catalyst loading increased the degradation percentage and the reused-ZnO exhibits lower photocatalytic activity than the ZnO catalyst. It has been found that the photocatalytic degradation of indigo carmine obeyed the pseudo-first-order kinetic reaction in presence of zinc oxide. This was found from plotting the relationship between ln (C0/Ct) and irradiation the rate constant of the process.UV- spectrophotometer was used to study the indigo carmine photodegradation.

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Photocatalytic degradation of sulfamethazine in aqueous solution using ZnO with different morphologies

Royal Society Open Science ◽

10.1098/rsos.171457 ◽

2018 ◽

Vol 5 (4) ◽

pp. 171457 ◽

Cited By ~ 12

Author(s):

Zhigang Yi ◽

Juan Wang ◽

Tao Jiang ◽

Qiong Tang ◽

Ying Cheng

Keyword(s):

Aqueous Solution ◽

Photocatalytic Degradation ◽

Reaction System ◽

Degradation Pathway ◽

Order Reaction ◽

Pseudo First Order Reaction ◽

First Order ◽

Different Shapes ◽

Pseudo First Order ◽

Release Ratio

In this study, photocatalytic experiments of 20 mg l −1 sulfamethazine (SMN) in aqueous solution containing ZnO with different morphologies, tetra-needle-like ZnO (T-ZnO), flower-like ZnO (F-ZnO) and nanoparticles ZnO (P-ZnO), were performed. The results indicated that photocatalytic degradation of SMN was effective and followed the pseudo-first-order reaction, but the degree of SMN mineralization showed obvious differences using ZnO with different shapes. After 12 h irradiation, 86%, 71% and 50% of the initial total organic carbon was eliminated in SMN suspension containing T-ZnO, F-ZnO and P-ZnO, respectively. The release ratio of sulfur was close to 100% in the presence of T-ZnO, but reached to 86% and 67% in the presence of F-ZnO and P-ZnO, respectively. The release ratio of nitrogen was about 76%, 63% and 40% using T-ZnO, F-ZnO and P-ZnO as photocatalyst, respectively. The morphology of ZnO played an important role in determining its catalytic activity. Seven intermediates were observed and identified in the UV/T-ZnO reaction system by LC-MS/MS analysis, and a possible degradation pathway was proposed.

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