Photocatalytic decomposition of surfactants on nitrogen modified TiO2

The existence of pharmaceuticals in nature is a growing environmental problem, turning necessary the use of efficient treatments for the degradation of these substances, as the advanced oxidation processes (AOPs). In this work the AOPs UV/H2O2 and photo-Fenton were applied to degrade the pharmaceuticals lamivudine and zidovudine in an aqueous solution using a bench reactor, composed of three UV-C lamps. It was verified that the UV/H2O2 process presented a degradation of 97.33 ± 0.14% for lamivudine and 93.90 ± 0.33% for zidovudine, after 180 min of treatment and for an initial concentratin of each pharmaceutical of 5 mg.L-1 and [H2O2] of 600 mg.L-1. A methodology by artificial neural networks (ANNs) was used to model the photocatalytic process, with the MLP 7-23-2 ANN representing it well, and determining the relative importance (%) of each of the input variables for the pharmaceutical’s degradation process. Kinetic studies for the pharmaceutical degradation and the conversion of organic matter showed good adjustments to the pseudo first-order models with R2 raging from 0.9705 to 0.9980. Toxicity assays for the before treatment solution indicated that the seeds Lactuca sativa and Portulaca grandiflora showed growth inhibition whereas the post-treatment solution inhibited only the growth of Lactuca sativa.

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Micropollutants removal by full-scale UV-C/sulfate radical based Advanced Oxidation Processes

The Science of The Total Environment ◽

10.1016/j.scitotenv.2018.02.279 ◽

2018 ◽

Vol 630 ◽

pp. 1216-1225 ◽

Cited By ~ 26

Author(s):

J. Rodríguez-Chueca ◽

E. Laski ◽

C. García-Cañibano ◽

M.J. Martín de Vidales ◽

Á. Encinas ◽

...

Keyword(s):

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Full Scale ◽

Sulfate Radical ◽

Oxidation Processes ◽

Uv C

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Catalytic Advanced Oxidation Processes for Sulfamethoxazole Degradation

Applied Sciences ◽

10.3390/app9132652 ◽

2019 ◽

Vol 9 (13) ◽

pp. 2652 ◽

Cited By ~ 4

Author(s):

Jéssica Martini ◽

Carla A. Orge ◽

Joaquim L. Faria ◽

M. Fernando R. Pereira ◽

O. Salomé G. P. Soares

Keyword(s):

Carbon Nanotubes ◽

Titanium Dioxide ◽

Reaction Time ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Catalytic Ozonation ◽

Ion Concentrations ◽

Oxidation Processes ◽

Photocatalytic Ozonation ◽

Mineralization Degree

The degradation of sulfamethoxazole (SMX) by several advanced oxidation processes (AOPs) is carried out in the presence of different catalysts. The catalysts used consisted of carbon nanotubes (CNT), titanium dioxide (TiO2), a composite of carbon nanotubes and titanium dioxide (TiO2/CNT), and iron supported on carbon nanotubes (Fe/CNT). SMX removal was evaluated by catalytic ozonation, photocatalysis, catalytic oxidation with hydrogen peroxide, and combinations of these processes. The evolution of the SMX concentration during reaction time, the mineralization degree, the toxicity of the treated solution, and the formation of organic intermediates and ions were monitored. Ozonation catalyzed by Fe/CNT and CNT and photocatalytic ozonation in the presence of CNT presented the fastest degradation of SMX, whereas photocatalytic ozonation with CNT showed the best results in terms of organic matter removal (92% of total organic carbon (TOC) depletion). Total mineralization of the solution and almost complete reduction of toxicity was only achieved in the photocatalytic ozonation with H2O2 and Fe/CNT catalysts. The compound 3-amino-5-methylisoxazole was one of the first intermediates formed during SMX degradation. p-Benzoquinone was only formed in photocatalysis. Oxalic and oxamic acids were also detected and in most of the catalytic processes they appeared in small amounts. Ion concentrations increased with the reaction time.

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Intensification of UV-C tertiary treatment: Disinfection and removal of micropollutants by sulfate radical based Advanced Oxidation Processes

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2018.04.044 ◽

2019 ◽

Vol 372 ◽

pp. 94-102 ◽

Cited By ~ 33

Author(s):

J. Rodríguez-Chueca ◽

C. García-Cañibano ◽

R.-J. Lepistö ◽

Á. Encinas ◽

J. Pellinen ◽

...

Keyword(s):

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Sulfate Radical ◽

Tertiary Treatment ◽

Oxidation Processes ◽

Uv C

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Degradation of ethyl paraben in aqueous medium using advanced oxidation processes: Efficiency evaluation of UV-C supported oxidants

Journal of Cleaner Production ◽

10.1016/j.jclepro.2018.01.197 ◽

2018 ◽

Vol 180 ◽

pp. 505-513 ◽

Cited By ~ 34

Author(s):

Sarita Dhaka ◽

Rahul Kumar ◽

Sang-hun Lee ◽

Mayur B. Kurade ◽

Byong-Hun Jeon

Keyword(s):

Aqueous Medium ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Efficiency Evaluation ◽

Oxidation Processes ◽

Uv C

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Photoreactor Modeling: Applications to Advanced Oxidation Processes

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1617 ◽

2008 ◽

Vol 6 (1) ◽

Cited By ~ 1

Author(s):

Orlando M Alfano ◽

Alberto E. Cassano

Keyword(s):

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Photocatalytic Decomposition ◽

Participating Media ◽

Photocatalytic Reactor ◽

Analysis And Design ◽

Oxidation Processes ◽

Rigorous Approach ◽

Solar Reactor ◽

First Case

A general methodology for photoreactor analysis and design based on the fundamentals of chemical reaction engineering and radiative transfer in participating media is presented. Three applications in the field of advanced oxidation processes are considered to illustrate the proposed approach: (i) a photocatalytic reactor for air purification, (ii) a homogeneous photo-Fenton solar reactor, and (iii) a heterogeneous photocatalytic slurry reactor. In the first case, the procedure is exemplified with the modeling of a multiannular photocatalytic reactor for perchloroethylene removal from contaminated air streams. A rigorous physical and mathematical model of the multiannular concentric photoreactor was developed and experimentally verified. The second approach is illustrated with the degradation of a model pollutant by the Fenton and photo-Fenton reactions in a nonconcentrating, flat-plate solar reactor. Formic acid was chosen as the model substrate. The effect of the reaction temperature on the pollutant degradation rate is analyzed. In the case of the slurry photoreactor, the intrinsic kinetics of the photocatalytic decomposition of a toxic organic compound in aqueous solution, using suspended titanium dioxide catalytic particles and ultraviolet polychromatic radiation, is studied. The kinetic parameters are evaluated for different catalyst loadings, irradiation levels and pollutant initial concentrations. By means of these illustrative examples, the need of a systematic and rigorous approach to the analysis and design of photoreactors is emphasized.

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Degradation of the pharmaceuticals lamivudine and zidovudine using advanced oxidation processes

Ciência e Natura ◽

10.5902/2179460x40968 ◽

2020 ◽

Vol 42 ◽

pp. e30

Author(s):

Alex Leandro Andrade de Lucena ◽

Daniella Carla Napoleão ◽

Hélder Vinícius Carneiro da Silva ◽

Rayany Magali Da Rocha Santana ◽

Beatriz Galdino Ribeiro ◽

...

Keyword(s):

Lactuca Sativa ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Kinetic Studies ◽

Degradation Process ◽

Oxidation Processes ◽

First Order ◽

Input Variables ◽

Pharmaceutical Degradation ◽

Uv C

The existence of pharmaceuticals in nature is a growing environmental problem, turning necessary the use of efficient treatments for the degradation of these substances, as the advanced oxidation processes (AOPs). In this work the AOPs UV/H2O2 and photo-Fenton were applied to degrade the pharmaceuticals lamivudine and zidovudine in an aqueous solution using a bench reactor, composed of three UV-C lamps. It was verified that the UV/H2O2 process presented a degradation of 97.33 ± 0.14% for lamivudine and 93.90 ± 0.33% for zidovudine, after 180 min of treatment and for an initial concentratin of each pharmaceutical of 5 mg.L-1 and [H2O2] of 600 mg.L-1. A methodology by artificial neural networks (ANNs) was used to model the photocatalytic process, with the MLP 7-23-2 ANN representing it well, and determining the relative importance (%) of each of the input variables for the pharmaceutical’s degradation process. Kinetic studies for the pharmaceutical degradation and the conversion of organic matter showed good adjustments to the pseudo first-order models with R2 raging from 0.9705 to 0.9980. Toxicity assays for the before treatment solution indicated that the seeds Lactuca sativa and Portulaca grandiflora showed growth inhibition whereas the post-treatment solution inhibited only the growth of Lactuca sativa.

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Degradation of anatoxin-a by UV-C LED and UV-C LED/H2O2 advanced oxidation processes

Chemical Engineering Journal ◽

10.1016/j.cej.2015.03.128 ◽

2015 ◽

Vol 274 ◽

pp. 274-281 ◽

Cited By ~ 34

Author(s):

Shilpi Verma ◽

Mika Sillanpää

Keyword(s):

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Oxidation Processes ◽

Uv C

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An Introduction to Advanced Oxidation Processes (AOP) for Destruction of Organics in Wastewater

Water Quality Research Journal ◽

10.2166/wqrj.1992.001 ◽

1992 ◽

Vol 27 (1) ◽

pp. 1-22 ◽

Cited By ~ 66

Author(s):

J. H. Carey

Keyword(s):

Hydrogen Peroxide ◽

Titanium Dioxide ◽

Wastewater Treatment ◽

Organic Compounds ◽

Hydroxyl Radicals ◽

Advanced Oxidation Processes ◽

Advanced Oxidation ◽

Oxidation Processes ◽

Oxidation Of Organic Compounds ◽

Organic Wastewater

Abstract Various processes that have been suggested for the oxidation of organic compounds in wastewater are summarized. The most widely applicable are based on generation of hydroxyl radicals via the photolysis of hydrogen peroxide, ozone and titanium dioxide. Other methods of generating hydroxyl radicals and other oxidants, as well as other methods of oxidation that have been suggested for organic wastewater treatment are also discussed.

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