scholarly journals EFICIENCIA SOLAR DE UN NUEVO FOTO-CATALIZADOR TiO2 DEPOSITADO SOBRE UN PAPEL FOTO-INERTE PARA LA DEGRADACIÓN TOTAL DE VARIOS PLAGUICIDAS Y COLORANTES

2017 ◽  
Vol 20 (2) ◽  
pp. 5
Author(s):  
Thu Hoai Bui ◽  
Maithaa Karkmaz ◽  
Eric Puzenat ◽  
Chantal Guillard ◽  
Jean-Marie Herrmann
Keyword(s):  
Congo Red ◽  
Organic Pollutant ◽  
Indigo Carmine ◽  
Falling Film ◽  
Solar Exposure ◽  
Palabras Clave ◽  
Indigo Carmin ◽  
Titania Photocatalyst ◽  
Good Exposure ◽  
Good Oxygenation

ABSTRACTA specially designed titania photocatalyst was prepared by coating Ahlstrom non-woven paper, used as a flexible photocatalytic support, with Millennium PC500 anatase. At the same time, a new solar photoreactor (STEP) was designed based on the multi-step cascade falling-film principle to ensure good exposure to sunlight and good oxygenation of the effluent to be treated. Several types of reactants were treated: 4-chlorophenol as a model organic pollutant; formetanate, a widely used pesticide in horticulture; a mixture of pesticides used in vineyards; and Indigo Carmine and Congo Red, which are complex multifunctional dye molecules. Each reaction was performed simultaneously in a solar CPC slurry photoreactor and in the STEP photoreactor under identical solar exposure to better evaluate and validate the results obtained. The STEP solar reactor was found to be as efficient as the CPC one for 4-chlorophenol and formetanate total degradation. Keywords.-Pesticide, Degradation, Photocatalyst. RESUMENUn diseño especial de un fotocalizador de TiO2 fue depositado sobre un papel foto inerte. Al mismo tiempo un nuevo fotoreactor solar (STEP) fue diseñado en base a una cascada multipaso, generando buenos resultados a la exposición de la luz solar con buena oxigenación del efluente que se trato. Se utilizaron como reactivos a tratar: 4- clorofenol como un contaminante orgánico, formetano ampliamente usado como pesticida en horticultura, y una mezcla de pesticidas usadas en viñedos; así mismo el índigo carmín y congo red como complejos multifuncional de colorantes. Cada reacción fue realizada en un reactor STEP con agitación y exposición solar CPC simultáneamente para tener una mejor evaluación de los resultados obtenidos. El reactor solar STEP fue muy eficiente como el CPC, para el 4-clorofenol y formetano se obtuvo una degradación total. Palabras clave.- Plaguicidas, Degradación, Fotocatalizador.

scholarly journals MWCNTs/Ag-ZnO nanocomposite for efficient photocatalytic degradation of congo red

2020 ◽  
Vol 34 (1) ◽  
pp. 55-66
Author(s):  
Amogne W. Yibeltal ◽  
Belete B. Beyene ◽  
Shimelis Admassie ◽  
Abi M. Taddesse
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Rate Constant ◽  
Congo Red ◽  
Organic Pollutant ◽  
Order Rate Constant ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Role Of Light

Three nanomaterials namely, zinc oxide (ZC), silver-doped zinc oxide (AZ) and multi-walled carbon nanotubes coupled with silver doped zinc oxide nanocomposite (MWAZ) were synthesized, characterized and employed for photo degradation of an organic pollutant, congo red (CR). The photocatalytic activity study showed efficient degradation of CR upon irradiation with UV and visible light in the order of MWAZ > AZ > ZC > Commercial ZnO (ZCO). Percentage photodegradation of 99% and a pseudo 1st order rate constant of 2.3 x 10-2 min-1 were achieved by MWAZ as a catalyst under visible light irradiation, implying photo- sensitizing ability of MWCNTs and the capability of MWCNTs to hinder recombination of photogenerated holes and electrons. The control experiment in the dark condition gave only 7.9% of degradation efficiency and 5.56 x 10-4 min-1 rate constant, implying the significant role of light source for catalytic degradation of CR.   Bull. Chem. Soc. Ethiop. 2020, 34(1), 55-66. DOI: https://dx.doi.org/10.4314/bcse.v34i1.5

Biosorption of Congo red and Indigo carmine by nonviable biomass of a newDietziastrain isolated from the effluent of a textile industry

2013 ◽  
Vol 51 (28-30) ◽  
pp. 5840-5847 ◽  
Author(s):  
Papita Das Saha ◽  
Puspita Bhattacharya ◽  
Keka Sinha ◽  
Shamik Chowdhury
Keyword(s):  
Congo Red ◽  
Textile Industry ◽  
Indigo Carmine

Competitive adsorption removal of indigo carmine and Congo red dyes from residual effluents by Zn2Al-LDH prepared by co-precipitation

2020 ◽  
Vol 201 ◽  
pp. 404-419
Author(s):  
Ali Bouteiba ◽  
Naceur Benhadria ◽  
Abdelkader Elaziouti ◽  
Karima Ezziane ◽  
Nourredine Bettahar
Keyword(s):  
Congo Red ◽  
Competitive Adsorption ◽  
Indigo Carmine ◽  
Adsorption Removal ◽  
Co Precipitation

Montmorillonite Incorporated in Cr Doped ZnO Nanoparticles for Degradation of Organic Dyes in Water under UV Light Irradiation

2015 ◽  
Vol 1123 ◽  
pp. 316-321 ◽  
Author(s):  
Vici Tritella Carmida ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Zno Nanoparticles ◽  
Congo Red ◽  
Organic Dyes ◽  
Uv Light ◽  
Organic Pollutant ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Uv Light Irradiation ◽  
Doped Zno

In this study, the photocatalytic degradation of methylene blue and congo red has been investigated using montmorillonite modified Cr-doped ZnO nanoparticles. Chromium doped zinc oxide nanoparticles were synthesized by co-precipitation method and were characterized using X-ray diffraction, Fourier-transform infrared absorption and UV-visible spectrophotometer. Furthermore these nanoparticles were explored to degradation of methylene blue and congo red in aqueous solution as model of organic pollutant under UV light irradiation. Comparison of degradation efficiency demonstrated that Cr-doped ZnO nanoparticles modified montmorillonite exhibited higher activity than pure Cr-doped ZnO.

Comparative Study on Photocatalytic Performance of (La,Fe) and (Ce,Fe)-Codoped ZnO Nanoparticles

2015 ◽  
Vol 827 ◽  
pp. 31-36 ◽  
Author(s):  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Congo Red ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ammonium Oxalate ◽  
Butyl Alcohol ◽  
Precipitation Method ◽  
X Ray

The present study evaluates the photocatalytic degradation of congo red as a model of organic pollutant over LaFe- and CeFe-codoped ZnO nanoparticles under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, diffuse reflectance spectroscopy. The photodegradation efficiency of congo red using two 20W UV lamp was higher for LaFe-codoped ZnO nanoparticles compared with CeFe-codoped ZnO nanoparticles. Photocatalytic mechanism was investigated by measuring the photocatalytic degradation rate in the presence of ammonium oxalate, natrium sulfate, tert-butyl alcohol as photogenerated holes, photogenerated electrons and hydroxyl radical species scavenger. The results revealed that electrons are the main species in the photocatalytic process.

scholarly journals Surface basicity mediated rapid and selective adsorptive removal of Congo red over nanocrystalline mesoporous CeO2

2021 ◽  
Author(s):  
Deepak Joshy ◽  
Seena Chacko ◽  
Yahya Ahmed Ismail ◽  
Pradeepan Periyat
Keyword(s):  
Congo Red ◽  
Organic Pollutant ◽  
Ceo2 Nanoparticles ◽  
First Report ◽  
Adsorptive Removal ◽  
Surface Basicity ◽  
Mesoporous Ceo2

Herein we first report surface basicity mediated rapid and selective adsorptive removal of congored from mixture of organic pollutant over nanocrystalline mesoporous CeO2. The surface basicity of mesoporous CeO2 nanoparticles...

scholarly journals Development of Photocatalytic Coatings by Thermal Hydrolysis of TiCl4 on Ceramic Roofing Tiles Made from Ferroalumina and Evaluation of De-Pollution Properties

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 620
Author(s):  
Angeliki Christogerou ◽  
Dimitra Koumpouri ◽  
George N. Angelopoulos
Keyword(s):  
Environmental Sustainability ◽  
Building Materials ◽  
Organic Pollutant ◽  
Indigo Carmine ◽  
Bauxite Residue ◽  
Thermal Hydrolysis ◽  
Atmospheric Conditions ◽  
Lower Efficiency ◽  
Negative Effect ◽  
Hydrolysis Of

The development of new, environmental friendly building materials with photocatalytic properties remain still on the top of the investigations both for academy and industry. The main drive is the increasing air pollution and the greenhouse gas emissions that have negative effect on public health and buildings. Ceramic roofing tiles functionalized with TiO2 can contribute on tackling these severe environmental problems by improving their properties. In this study, heavy clay ceramics manufactured from clay-body mixture and a Bayer process bauxite residue (ferroalumina) are used as substrates for the deposition of TiO2 coatings in order to produce self-cleaning ceramic surfaces. The process is based on the thermal hydrolysis of TiCl4 which takes place in a CVD reactor under atmospheric conditions. All coated samples were annealed at 600 °C and characterized in means of XRD, SEM/EDS and degradation ability of an organic pollutant. The formation of titania mixed phases (rutile and perovskite) shows positive results regarding the photocatalytic activity of the samples. The ones containing ferroalumina decomposed 100% the indigo carmine solution after 4 h, in comparison with the reference one which presented lower efficiency. Finally, this paper addresses technical feasible solutions for the production of photocatalytic active ceramics within the concept of circular economy and environmental sustainability.

Adsorptive removal of congo red dye from aqueous solutions using Mo-doped CoFe2O4 magnetic nanoparticles

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ibrahim A. Amar ◽  
Jawaher O. Asser ◽  
Amina S. Mady ◽  
Mabroukah S. Abdulqadir ◽  
Fatima A. Altohami ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Aqueous Solutions ◽  
Congo Red ◽  
Organic Pollutant ◽  
Point Of Zero Charge ◽  
Solution Temperature ◽  
Anionic Dyes ◽  
Content Type ◽  
Kinetics And Isotherms ◽  
Nano Adsorbent

Purpose The main purpose of this paper is to investigate the adsorption properties of CoFe1.9Mo0.1O4 magnetic nanoparticles (CFMo MNPs) using, anionic dye “congo red (CR)” as a model of water pollutants. Design/methodology/approach The magnetic nano-adsorbent was synthesized via sol-gel process. Different techniques including; Fourier transform infrared spectroscopy, point of zero charge, scanning electron microscope and X-ray powder diffraction were used to characterize the prepared adsorbent. Adsorption experiments were conducted in batch mode under various conditions (contact time, shaking speed, initial dye concentration, initial solution pH, solution temperature and adsorbent amount) to investigate the adsorption capability of CFMo MNPs for CR. Findings The results showed that, CFMo MNPs could successfully remove more than 90% of CR dye within 20 min. Adsorption kinetics and isotherms were better described using pseudo-second-order (PSO) and Langmuir models, respectively. The maximum adsorbed amount (qmax) of CR dye was 135.14 mg/g. The adsorption process was found to be endothermic and spontaneous in nature as demonstrated by the thermodynamics ( ΔGo, ΔHoand ΔSo). Practical implications This study provided a good example of using an easily separated magnetic nano-adsorbent for fast removal of a very toxic organic pollutant, congo red, from the aquatic environment Originality/value The employment of Mo-doped cobalt ferrite for the first time for removing hazardous anionic dyes such as congo red from their aqueous solutions.

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