scholarly journals FOTOCATÁLISE HETEROGÊNEA APLICADA NO TRATAMENTO DO CORANTE RODAMINA B – USO DE CATALISADOR DE TIO2 SOB RADIAÇÃO UV

e-xacta ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 11
Author(s):  
Jorge David Alguiar Bellido ◽  
Maysa Martins Almeida ◽  
Anna Luisa Silva Cotta ◽  
Júlia Paula Oliveira Júlio ◽  
Carlos Alberto Santos Vaz
Keyword(s):  
Textile Industry ◽  
Chemical Nature ◽  
Glass Plate ◽  
Sample Solution ◽  
Complex Composition ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Absorbance Measurement ◽  
Rhodamine B Dye ◽  
Uv Lamps

Resumo: Os efluentes dos processos de tingimento na indústria têxtil apresentam uma complexa composição, incluindo principalmente corantes de diferente natureza química, portanto o tratamento destes tem como finalidades necessárias a remoção da cor e a degradação dos compostos orgânicos presentes. Dessa forma, este projeto teve por objetivo apresentar uma alternativa frente ao descarte de efluentes têxteis, usando como modelo o corante rodamina B, um corante resistente à fotodegradação natural. O projeto consistiu na construção de um reator fotocatalítico usando uma placa de vidro jateada e impregnada com catalisador de TiO2. Essa placa foi fixada com inclinação estabelecida. Além disso, foram utilizadas duas lâmpadas germicidas de radiação UV e potência de 15 W. Foram analisados a influência da concentração inicial, tempo de residência no reator e pH da solução para remoção de cor do corante. A descoloração da solução foi acompanhada pela medida da absorbância das amostras coletadas durante o ensaio. A eficiência do reator foi avaliada em relação à descoloração da solução. Os melhores resultados foram obtidos para uma solução de 7,80 mg L-1 a pH 5.0 foi tratada por 430 min alcançando um 97,84% de descoloração. AbstractThe effluents from the dyeing processes in the textile industry have a complex composition, including mainly dyes of different chemical nature, so the treatment of these has the necessary purposes of removing the color and the degradation of the organic compounds present. In this way, this project aimed to present an alternative to the disposal of textile effluents, using as a model the rhodamine B dye, a dye resistant to natural photodegradation. The project consisted in the construction of a photocatalytic reactor using a blasted glass plate and impregnated with TiO2 catalyst, It was fixed in a pre-established inclination, besides that, two germicide UV lamps at 15 W were employed. The influence of the initial concentration, residence time in the reactor and pH of the solution for color removal of the dye were analyzed. Solution discoloration was followed by absorbance measurement of the sample solution collected along the assay. The reactor efficiency was evaluated in relation to the discoloration of the sample solution. Best results were achieved when a solution of 7.80 mg L-1 at pH 5.0 was treated for 430 min reaching 97.84% of discoloration.

scholarly journals Removal of aqueous organic pollutant by photo-Fenton process using low-cost Fe3O4/zeolite A

2021 ◽  
Vol 947 (1) ◽  
pp. 012013
Author(s):  
Ho Gia Quynh ◽  
Nguyen Anh Kiet ◽  
Huynh Van Thanh ◽  
Ta Man Tue ◽  
Nguyen Thi Truc Phuong ◽  
...  
Keyword(s):  
Textile Industry ◽  
Fenton Reaction ◽  
Low Cost ◽  
Organic Pollutant ◽  
Impregnation Method ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
Initial Concentration ◽  
The Stability ◽  
Uv Lamps

Abstract Degradation of methylene blue (MB) in textile water treatment was investigated by using the photo - Fenton method (mixture of Fe2+ and H2O2 with the UV irradiation) in the presence of nano-sized and low-cost catalyst Fe3O4/Zeolite A. This catalyst was synthesized by impregnation method; furthermore, its photo – catalytic performances and durability in heterogeneous Fenton system were evaluated. Both the structure and the physical chemistry properties of the photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM). The study investigated the influences of different parameters of the MB decolorization efficiency such as initial concentration of peroxide attending the Fenton reaction, amounts of catalyst, pH of the dye solution and comparison of utilization of H2O2 in two cases with and without UV lamps. Under the optimum conditions which is the initial concentration of MB is 50 ppm and pH of dye solution is 3, high efficiencies of degradation were achieved – performance of 92.49%. These results suggest that the low-cost nanostructure catalyst Fe3O4/Zeolite A may be the considerable option because of the durability and the stability in the photo – Fenton reaction for organic wastewater treatment in textile industry.

scholarly journals Degradation of Remazol Brilliant Blue Using Plasma Electrolysis Method with NaCl and Fe2+ Ion Addition

2018 ◽  
Vol 67 ◽  
pp. 01012 ◽  
Author(s):  
Nelson Saksono ◽  
Dwiputra Muhammad Zairin ◽  
Fikri Averous
Keyword(s):  
Hydroxyl Radicals ◽  
Textile Industry ◽  
Degradation Process ◽  
Air Injection ◽  
Ion Concentration ◽  
Brilliant Blue ◽  
Initial Concentration ◽  
Plasma Electrolysis ◽  
Good Potential ◽  
Electrolysis Method

Remazol Brilliant Blue is a dye waste mostly generated by the textile industry and can be very dangerous to the environment. Plasma electrolysis is a method that can produce hydroxyl radicals in large quantities in order to degrade the dye compounds. This study aims to test the ability of plasma electrolysis method to degrade Remazol Brilliant Blue wastewater using NaCl as electrolyte, with the addition of Fe2+ ion and air injection. Before the degradation process was carried out, permanganometric test was performed to see the production of hydroxyl radicals with the variations of electrolyte concentration and voltage. The degradation process were investigated more specifically by looking at the effect of Fe2+ ion concentration and the initial concentration of Remazol Brilliant Blue. Remazol Brilliant Blue degradation reached 98.5% in 30 minutes where the initial concentration of Remazol Brilliant Blue is 100 ppm, voltage of 750 V, NaCl concentration 0.03 M,with the addition of 40 ppm Fe2+ ion and air injection. The results show that plasma electrolysis with NaCl as electrolyte using air injection has a good potential in degrading dye wastewater in the environment.

scholarly journals Influence of Operating Parameters on Photocatalytic Oxidation of 2,4-Dichlorofenol in Aqueous Solution by TiO2/Stainless Steel Photocatalytic Membrane

2021 ◽  
Vol 11 (24) ◽  
pp. 11664
Author(s):  
Liliana Bobirică ◽  
Constantin Bobirică ◽  
Giovanina Iuliana Lupu ◽  
Cristina Orbeci
Keyword(s):  
Stainless Steel ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Organic Substrate ◽  
Molar Ratio ◽  
Operating Parameters ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Working Solution

The influence of some operating parameters of an UV photocatalytic reactor with TiO2/stainless steel photocatalytic membrane on the photocatalytic oxidation of 2,4-dichlorophenol from aqueous solutions was studied in this paper. It was shown that the pH of the working solution substantially influences the photocatalytic degradation of the organic substrate, with the degradation efficiency increasing with decreasing the pH of the working solution by a maximum corresponding to pH 3. The rate constant of the photocatalytic oxidation process is about twice as high at pH 3 comparative with pH 7 for the same initial concentration of the organic substrate. The molar ratio of hydrogen peroxide/organic substrate also influences the photocatalytic oxidation process of the organic substrate. The results obtained in this paper highlight the fact that a stoichiometric molar ratio is favorable for the photocatalytic degradation of 2,4-dichlorophenol. It has also been shown that the initial concentration of the organic substrate influences the rate of photocatalytic degradation. It appears that the rate of photocatalytic degradation decreases with the increasing of initial concentration of 2,4-dichlorophenol.

scholarly journals Treatment of Landfill Leachates with Combined Acidification/Coagulation and The Fe0/H2O2 Process

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 194 ◽  
Author(s):  
Jan Bogacki ◽  
Piotr Marcinowski ◽  
Balkess El-Khozondar
Keyword(s):  
Statistical Analysis ◽  
Processing Time ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Environmental Concerns ◽  
Landfill Leachates ◽  
Complex Composition ◽  
Combined Process ◽  
Initial Concentration ◽  
Toc Removal

One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe0/H2O2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe0/H2O2 process with 8000/9200 mg/L Fe0/H2O2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe0/H2O2 process after coagulation at pH 6.0 for optimal Fe0/H2O2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe0/H2O2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe0/H2O2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.

scholarly journals UV/Tio2 photocatalytic reactor for real textile wastewaters treatment

2014 ◽  
Vol 70 (10) ◽  
pp. 1670-1676 ◽  
Author(s):  
Maurício da Motta ◽  
Raquel Pereira ◽  
M. Madalena Alves ◽  
Luciana Pereira
Keyword(s):  
Uv Light ◽  
Oxygen Demand ◽  
Biodegradable Materials ◽  
Textile Dye ◽  
Complex Composition ◽  
Photocatalytic Reactor ◽  
Wastewaters Treatment ◽  
Efficient Alternative ◽  
Cellulosic Fabric ◽  
Textile Wastewaters

Textile dye wastewaters are characterized by strong colour, salts and other additives, high pH, temperature, chemical oxygen demand (COD) and biodegradable materials. Being aesthetically and environmentally unacceptable, these wastewaters need to be treated before their discharge. Anaerobic bioprocesses have been proposed as being environmentally friendly and relatively cheap; however, when applied to real effluent with a complex composition, they can fail. In this study, a photoreactor combining UV light and TiO2, immobilized in cellulosic fabric, was applied for the treatment of two industrial textile wastewaters. High colour and COD removal, and detoxification, were achieved for both wastewaters, at controlled pH of 5.5. Effluents showed very poor biodegradability due to their complex composition; thus, the proposed process is an efficient alternative.

scholarly journals Optimization of Nano- Photocatalytic Reactor for Organophosphorus Degradation

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Ilin Sadeghi ◽  
Pooya Arbab ◽  
Mahdi Fathizadeh ◽  
Hoseen Fakhraee ◽  
Mahdi Amrollahi
Keyword(s):  
Reaction Rate ◽  
Ph Value ◽  
Lag Time ◽  
Complete Oxidation ◽  
Triethyl Phosphate ◽  
Kinetic Reaction ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Kinetic Order ◽  
Complete Degradation

The photocatalytic decontamination of triethyl phosphate (TEP) is studied by the UV/nano-TiO2process. The nano-TiO2concentration and pH value for the complete oxidation of TEP were investigated in different concentrations of TEP. The kinetic reaction was calculated for TEP as a function of initial concentration of TEP. Results of adsorptions showed that TEP was adsorbed better in alkalinity pH, and the natural pH had the highest reaction rate for complete degradation. Also, the zero-kinetic order with the lag time as a function of initial concentration of TEP and TiO2was suggested for oxidation of TEP. The optimized concentration of nano-TiO2was 400 mg/lit which had the best conversion and the lowest lag time in the reaction.

Photodegradation of Methylene Green in the Presence of Polypropylene Microfiber Material

2018 ◽  
Vol 781 ◽  
pp. 200-205
Author(s):  
Angelina Petrova ◽  
Olga Tchaikovskaja ◽  
Inna Plotnikova
Keyword(s):  
Uv Radiation ◽  
Uv Irradiation ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Photochemical Processes ◽  
Methylene Green ◽  
Photochemical Properties ◽  
The Relationship ◽  
Oxidizer Concentration

Degradation of toxicants in photocatalytic reactor is studied. To an array of data on the photochemical properties of Methylene Green (MG) when exposed to UV radiation in photoreactors was obtained. Based on the analysis of the results obtained, conclusions can be drawn about the relationship between the structure of pollutants, their initial concentration, oxidizer concentration, etc., with the efficiency of utilization, and schemes for photochemical processes was constructed. The role of polypropylene microfiber materials (PMM) in the degradation of MG under UV irradiation was studied.

Photocatalytic degradation of explosives contaminated water

2002 ◽  
Vol 46 (11-12) ◽  
pp. 139-145 ◽  
Author(s):  
S.-J. Lee ◽  
H.-S. Son ◽  
H.-K. Lee ◽  
K.-D. Zoh
Keyword(s):  
Photocatalytic Degradation ◽  
Total Nitrogen ◽  
Contaminated Water ◽  
Ammonium Ions ◽  
Nitrate Ion ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Initial Ph ◽  
Alkaline Conditions ◽  
The Impact

This study was undertaken to examine the degradation of TNT, RDX and HMX in a circular photocatalytic reactor with TiO2 as a photocatalyst. We examined the impact of parameters such as the initial concentration, initial pH of solution on rates of photocatalized transformation, and the mineralization. The results showed that photocatalysis is an effective process for the degradation of TNT, RDX and HMX. They could be completely degraded in 150 min with 1.0 g/L TiO2 at pH 7. An increase in the photocatalytic degradation of HMX was noticed with decreasing initial HMX. The rates of RDX and HMX degradation were greater in neutral pH than in acidic and alkaline conditions. In case of TNT degradation, the rate of degradation was the fastest at pH 11. Approximately 82% TOC decrease in the TNT degradation was achieved after 150 min, whereas TOC decrease in RDX and HMX was 24% and 59%, respectively. Nitrate, nitrite, and ammonium ions were detected as the nitrogen byproducts from the photocatalysis, and more than 50% of the total nitrogen was recovered as nitrate ion in every explosives.

scholarly journals Design and Operation of a Photocataytic Reactor: A Study of Dye (Methylene Blue) Removal Process

2014 ◽  
Vol 28 (1) ◽  
pp. 41-44
Author(s):  
MA Islam ◽  
M Rakib Uddin ◽  
MSA Amin ◽  
MI Haque ◽  
MSR Molla
Keyword(s):  
Methylene Blue ◽  
Chemical Engineering ◽  
Feed Solution ◽  
Continuous Reactor ◽  
Catalyst Loading ◽  
Pseudo First Order Reaction ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
First Order ◽  
First Results

The degradation of Methylene Blue (MB) in aqueous solution has been investigated in a photocatalytic reactor under UV radiation and in presence of zinc oxide (ZnO). The photodegradation kinetics follows pseudo-first order reaction. The effect of process parameters such as catalyst loading and initial concentration of MB on the degradation is investigated. The results show that the degradation rate is affected insignificantly by the increases in the catalyst dosage. Batch test, however, shows that with an increase in the initial concentration the apparent rate constant gradually decreases. The first results with a continuous reactor with a diluted feed solution show inspiring dye removal. DOI: http://dx.doi.org/10.3329/jce.v28i1.18110 Journal of Chemical Engineering, Vol. 28, No. 1, December 2013: 41-44

UV Radiation Distribution in A Flat-Plate Photocatalytic Reactor with Suspended Particles of Titanium Dioxide. Mathematical Model and Experimental Verification

1998 ◽  
Vol 3 (3) ◽  
Author(s):  
Rodolfo J. Brandi ◽  
Orlando M. Alfano ◽  
Alberto E. Cassano
Keyword(s):  
Mathematical Model ◽  
Flat Plate ◽  
Coming Out ◽  
Radiation Flux ◽  
Radiation Energy ◽  
Photocatalytic Reactor ◽  
Radiation Fluxes ◽  
Radiation Distribution ◽  
Parabolic Reflectors ◽  
Uv Lamps

AbstractA two-dimensional - two-directional mathematical model of the radiation field inside a flat-plate, photocatalytic reactor has been developed. The slurry-type reactor is irradiated by two tubular UV lamps with the aid of two parabolic reflectors. Resorting to information about the reactor dimensions, the lamp and reflector characteristics, and the catalyst optical properties and concentration, the solution of the mathematical model provides a detailed description of the rate of absorbed radiation energy at each point inside the reactor. The radiation distribution inside the reactor was verified by computing the radiation flux coming out of the reactor at the opposite face of the radiation entrance. These radiation fluxes were compared with experimental measurements made with a UV radiometer and good agreement was obtained; the maximum observed error was 12%. When the catalyst concentration was increased, a significant decrease of the radiation flux leaving the reactor was also observed.

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