Advanced Oxidative Processes
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. Nanoestruturas em fotocatálise: uma revisão sobre estratégias de síntese de fotocatalisadores em escala nanométrica
Advanced oxidative processes (AOPs) are based on chemical processes that can generate free radicals, such as hydroxyl radicals (.OH) which are strong, non-selective oxidant species that react with the vast majority of organic compounds. Nanostructured semiconductors, especially titanium dioxide (TiO2) in the anatase phase, are well-established photocatalysts
Química Nova. Publicado em: 2009
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14. Estudo da remoÃÃo e degradaÃÃo dos corantes Remazol Black B e Remazol Red RB 133%, e do fÃrmaco Ganciclovir, com aplicaÃÃo de Processos Oxidativos AvanÃados
The contamination of rivers, seas, lakes and oceans is one of the major problems of modern society, caused in large part by industrial activities. Textile processing, particularly generate great amounts of effluent characterized by a high organic load, strong color and toxic chemical compounds, which, depending on the dye, can also contain mutagenic, carcino
Publicado em: 2009
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15. Remoção de desreguladores endócrinos por fotocatálise heterogênea e ozonização / Removal of endocrine disrupting compounds by photocatalysis and ozonation
Desreguladores endócrinos são compostos que podem alterar o sistema endócrino dos indivíduos, bem como sua fertilidade e por em risco a saúde dos mesmos. Muitas questões relacionadas a esses compostos ainda não foram elucidadas, apesar de serem muito estudados recentemente. Diversas pesquisas têm sido feitas investigando-se o emprego de processos oxi
Publicado em: 2009
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16. RemoÃÃo do corante remazol amarelo ouro RNL 150% por fotocatÃlise homogÃnea
A indÃstria tÃxtil tem utilizado corantes que ao entrarem no meio aquÃtico comprometem a estÃtica das Ãguas e impedem a fotossÃntese, comprometendo os processos hidroquÃmicos. No contexto do tratamento dos efluentes indÃstriais, destacam-se os Processos Oxidativos AvanÃados (POAs) que apresentam alta eficiÃncia na degradaÃÃo de inÃmeros composto
Publicado em: 2009
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17. Estudo da degradação de corante têxtil em matrizes aquosas por meio dos processos oxidativos avançados O3-H2O2/UV e foto-Fenton. / Study on the degradation of a textile dye in aqueous matrices by the oxidative processes O3-H2O2/UV and photo-Fenton.
The textile industry generates large volumes of wastewater with high organic load, strong coloration and toxicity. In this work, the treatment of an aqueous solution containing the dye Solophenyl Yellow Arle 154% was studied by the O3-H2O2/UV and photo-Fenton processes, in order to evaluate the responses color removal after 5 minutes; color removal after 60
Publicado em: 2009
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18. APLICAÇÃO DE PROCESSOS OXIDATIVOS AVANÇADOS HOMOGÊNEOS E HETEROGÊNEOS NA DEGRADAÇÃO DE EFLUENTES DE CURTUME
This study investigated the application of advanced oxidative processes for the homogeneous and heterogeneous degradation of a tanning effluent. The catalytic activity of a solid oxide containing manganese was evaluated in the heterogeneous systems. The experiments were performed in a photocatalytic batch reactor in laboratory scale. The solid used was the c
Publicado em: 2008
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19. Evaluation of oxidative processes for the environmentally apropriate treatment of cutting fluids / Avaliação de processos oxidativos para o tratamento ambientalmente adequado de fluidos de corte
Durante o processo metalúrgico de usinagem de uma peça ocorre a geração de calor proveniente do atrito ferramenta/peça e cavaco/ferramenta. Para que ocorra uma menor geração de calor possibilitando o manuseio, bem como a minimização na deformação da peça, utilizam-se fluidos, que são soluções lubrificantes à base de óleos, água ou polímero
Publicado em: 2008
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20. Degradação fotoquímica de efluentes industriais contendo polipropileno e isoniazida
One of the main impacts to the environment is the water pollution, where the industrial sector is one of the main sources of this problem. In order to search for a solution, the industrial sector is looking forward to new technologies to treat its wastewaters with the goal to reuse the water in the own process. In this mode, the treatment presents a reductio
Publicado em: 2008
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21. Fotodegradação de polímeros solúveis em água e moléculas modelo via processos oxidativos avançados / Photodegradation of water soluble polymers and model molecules via advanced oxidative processes
The aim of this work was to investigate polymer photodegradation mechanisms and stabilizing agents. The course of photooxidative degradation of some water soluble polymers (poly(vinylpyrrolidone), PVP; poly(acrylamide), PAM and poly(ethylene glycol), PEG) in the presence of hydrogen peroxide, Fenton reagent and iron salt has been investigated. PVP showed the
Publicado em: 2008
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22. Advanced oxidative process for treating the effluents from the bleached kraft cellulose industry / Processos oxidativos avançados para tratamento de efluentes de indústria de celulose kraft branqueada
In this work, the processes photo-Fenton, H2O2/UV, TiO2/UV and H2O2/TiO2/UV were compared and optimized in order to obtain organic matter removals from the effluents of the bleached kraft cellulose industry. Those processes were applied before and after the biological treatment of the effluents. Initially, the best pH conditions for application of the proces
Publicado em: 2007
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23. Photochemical degradation study of aqueous solutions of polyrthyleneglicol, polyacrylamide and polyvinylpyrrolidone. / Estudo da degradação fotoquímica de soluções aquosas de polietilenoglicol, poliacrilamida e polivinilpirrolidona.
The aim of this work is to apply advanced oxidative processes to study the degradation of industrial wastewater containing water-soluble polymers. Kinetic constants of reactions involved in the oxidation processes were calculated by molecular modeling. In the experimental part the degradation of polyvinylpirrolidone (PVP), polyacrylamide (PAM) and polyethyle
Publicado em: 2007
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24. Modification and immobilization of TiO2 aiming the degradation of organic pollutant compounds by heterogeneous photocatalysis process / Modificação e imobilização de TiO2 visando a degradação de compostos orgânicos poluentes via o processo de fotocatálise heterogênea
The main goal of this work was to find alternatives capable to promote an improvement in terms of applicability of the heterogeneous photocatalysis process, in order to make it feasible in large scale. The use of the photocatalyst TiO2 immobilized and also modificated with adsorbent materials was evaluated. The heterogeneous photocatalysis process, either us
Publicado em: 2007