Loading...
Publication
Oxidação catalítica com peróxido de hidrogénio (CWPO) de poluentes lipofílicos usando materiais preparados por ativação de composto derivado de resíduos sólidos urbanos
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 951.55 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Atualmente, os resíduos orgânicos urbanos são tipicamente tratados por digestão anaeróbia e compostagem
para produzir composto que é usado na agricultura como fertilizante. No entanto, a legislação europeia em
matéria de gestão de resíduos, e os desenvolvimentos esperados nas próximas diretivas sobre a aplicação dos critérios relativos ao fim do estatuto de resíduo, estão a limitar o uso de fertilizantes procedentes de resíduos.
O presente trabalho propõe uma estratégia para a valorização de composto, convertendo-o em materiais de
baixo custo capazes de serem utilizados em catalisadores. O composto utilizado neste trabalho foi fornecido
por uma empresa de gestão de resíduos, sendo de seguida sujeito a tratamentos térmicos e hidrotérmicos. O material de partida foi lavado para remover os sólidos suspensos, sendo depois calcinado a 400 e a 800 ºC.
Adicionalmente, foram produzidos outros materiais por tratamento com H2SO4 (18 M) antes e depois da
calcinação a 800 ºC. Todos os materiais preparados foram testados na decomposição catalítica de H2O2 e na remediação de águas contaminadas com três poluentes modelo de caráter lipofílico distinto (Sudão-IV,
4-nitrofenol e 2-nitrofenol), por oxidação catalítica com peróxido de hidrogénio (CWPO). Verificou-se que a
atividade catalítica das amostras era fortemente afetada pelo caráter lipofílico dos contaminantes.
The urban organic waste is typically treated by anaerobic digestion and composting, in order to produce compost that can be used in agriculture. However, the current waste management legislation in Europe and the expected developments on the coming directives regarding the application of the “end-of-waste” criteria, are leading to barriers on the use of fertilizers resulting from waste. The current work proposes an alternative strategy to the valorisation of compost through the production of low-cost materials to be used as catalysts. The compost was supplied by a waste management company, and then subjected to thermal and hydrothermal treatments. Compost was washed in order to remove the soluble compounds and suspended solids, then calcined at 400 and 800 ºC. Additionally, more materials were prepared by attack with H2SO4 (18 M) before and after the calcination at 800 ºC. All prepared materials were sieved and the samples obtained were tested in H2O2 decomposition and in the remediation of waters containing three model pollutants with different lipophilic character (Sudan-IV, 4-nitrophenol and 2-nitrophenol) by catalytic wet peroxide oxidation (CWPO). The catalytic activity of the samples was found to be strongly affected by the lipophilic character of the contaminants.
The urban organic waste is typically treated by anaerobic digestion and composting, in order to produce compost that can be used in agriculture. However, the current waste management legislation in Europe and the expected developments on the coming directives regarding the application of the “end-of-waste” criteria, are leading to barriers on the use of fertilizers resulting from waste. The current work proposes an alternative strategy to the valorisation of compost through the production of low-cost materials to be used as catalysts. The compost was supplied by a waste management company, and then subjected to thermal and hydrothermal treatments. Compost was washed in order to remove the soluble compounds and suspended solids, then calcined at 400 and 800 ºC. Additionally, more materials were prepared by attack with H2SO4 (18 M) before and after the calcination at 800 ºC. All prepared materials were sieved and the samples obtained were tested in H2O2 decomposition and in the remediation of waters containing three model pollutants with different lipophilic character (Sudan-IV, 4-nitrophenol and 2-nitrophenol) by catalytic wet peroxide oxidation (CWPO). The catalytic activity of the samples was found to be strongly affected by the lipophilic character of the contaminants.
Description
Keywords
Oxidação catalítica com peróxido de hidrogénio Ativação Composto Reciclagem
Citation
Díaz de Tuesta, Jose Luis ; Masso, Caroline; Praça, Paulo; Silva, Adrián; Faria, Joaquim; Gomes, Helder (2018). Oxidação catalítica com peróxido de hidrogénio (CWPO) de poluentes lipofílicos usando materiais preparados por ativação de composto derivado de resíduos sólidos urbanos. In XXVI Congresso Ibero-Americano de Catálise: livro de atas. Coimbra, p. 280-285. ISBN 978-989-8124-23-4