| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 515.69 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Chemical wastewater treatments are dependent on the addition of auxiliary oxidants, which may include
molecular oxygen, ozone, and hydrogen peroxide, working on their own, or activated by means of a
specialized catalyst or photocatalyst. Chemical treatments are by nature definitive processes, since they can
lead to complete mineralization of the existing pollutants. However, this is seldom the case, when looking for
a rational solution from the socio-economical point of view. In the case of industrial effluents, special
treatments are often required, even when only a partial oxidative degradation is targeted, due to the complex
nature of the pollutants (e.g. dyes, pharmaceuticals, oils, organics, inorganics and bio-compounds).
Some compounds, like nitrophenols, are particularly refractory to aerobic biodegradation and in addition to
that toxic, requiring strong oxidative solutions. Typical solutions are the thermal processes at elevated
temperatures and pressures, or using metal supported catalysts. Alternatively, it is possible to use
heterogeneous photocatalysis based on the efficient production of hydroxyl radicals. Somewhere between
these two limits lies the catalytic wet peroxide oxidation (CWPO), an advanced oxidation process (AOP)
involving the use of hydrogen peroxide (H2O2) as oxidation source and a suitable catalyst (typically iron
based catalysts). The main role of the catalyst is to promote H2O2 decomposition through the formation of
hydroxyl radicals (HO●) with high oxidizing potential, effective in the destruction of a huge range of
pollutants [1,2]. This type of technology is especially attractive due to the use of mild conditions, simple
equipment and the environmental safe oxidant H2O2.
Description
Keywords
Citation
Faria, Joaquim L.,; Ribeiro Rui S.; Silva Adrián M.T.; Silva C.G., Figueiredo José L.; Gomes Helder (2013). Carbon nanotubes as base materials for water treatment processes, In CESEP’ 13 - 5th International Conference on Carbon for Energy Storage/Conversion and Environment Protection. Mülheim a.d. Ruhr, Alemanha.