Remoção de nitratos em água utilizando diferentes materiais e processos
The need to preserve the environment has led to the search for new materials for efficient disposal of chemical compounds that alter the stability of our natural resources. Among these resources, stands in first place the water, as a precious commodity and scarce, leading to the proper use and re...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19890 |
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| Resumo: | The need to preserve the environment has led to the search for new materials for
efficient disposal of chemical compounds that alter the stability of our natural resources.
Among these resources, stands in first place the water, as a precious commodity and
scarce, leading to the proper use and reuse. As a result, the World Health Organization
has established maximum permissible values in drinking water, such as: 50 mg/L, 0, 1
mg/L and 0, 5 mg/L to at-3, at-2, NH 4, respectively. For these reasons, assesses the
implementation of new materials and water treatment processes aiming at the removal
of these compounds, such as alumina, in the form of powder or as a support for a
catalytic system using inorganic membranes capable of supporting more severe
conditions of temperature and pressure by opening new possibilities for applications of
membrane reactors; and also for electrochemical treatments with doped diamond bobo
electrodes (BDD) as anode and copper as cathode. For such purpose, was conducted the
study of adsorption of nitrate in different times to assess the time required to achieve
equilibrium by employing three commercial alumina called: acidic, basic and neutral
alumina, with subsequent treatment only in the acidic alumina impregnating metals (PdCu/Al2O3)
for the catalytic reaction. The materials were previously characterized by
XRD, SEM techniques and ABET. Aluminas presented a considerable adsortive
capacity of nitrate in the first thirty minutes, equivalent to 50% of removal reaching
equilibrium in that time. After treatment, using alumina as catalyst for the reaction in
batch reactor (Pd-Cu/Al2O3), the results were more favourable, totalling 64% reduction
of ion NO3-at the end of three hours. On the other hand, the results for the catalytic
reaction using the catalytic support Pd-Cu/TiO2 in membrane reactor proved to be low.
-if, in this way, improve the conditions of catalytic system to optimize the process.
Already, for the electrochemical tests using DDB1 electrodes as anode, and Cu, as
cathode, there was a fairly significant nitrate reduction, approximately 80% of ion
removal during three hours and cost viable applications. |
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