9 research outputs found
Use of dirty plastic waste as precursors for activated carbon production – a contribution to the circular economy
The production of activated carbons (ACs) from dirty plastic wastes derived from the mechanical/biological treatment of urban solid wastes, disposable plastics and plastics used in agriculture is reported. The use of these precursors is innovative and contributes to the circular economy by the valorization of dirty plastics that are usually disposed in landfills. ACs were produced by physical activation, with air or CO2, and chemical activation, with KOH or K2CO3. ACs presented a BET (N2) area and pore volume up to 723 m2/g and 0.32 cm3/g. Selected samples were tested for the 2,4-dichlorophenoxyacetic acid (MCPA) and 4-chloro-2-methyl-phenoxyacetic acid (2,4-D) removal from the liquid phase. PB-K2CO3-1:1–700 presented an apparent maximum adsorption capacity of 245 and 289 mg g−1 for MCPA and 2,4-D, respectively.Fundo Ambiental Portuguê
Influence of surface ionization on the adsorption of aqueous mercury chlorocomplexes by activated carbons
Scanning electron microscopy of activated carbons prepared from commercial acrylic textile fibres
Dealing with plastic waste from agriculture activity
The increase in agricultural production and food quality has forced the growing useof plastics in various activities. The plastic wastes are partially recycled in or outside Portugal;nevertheless, the contaminated wastes are sent to landfill. It is crucial to consider new models fortheir valorization at a regional level and from a circular economy perspective. In the scope of the
Placarv
õ
es project, a study was elaborated, which included the types and quantities of plastics used
in the irrigation area of the Alqueva Dam, in southern Portugal. The crops that use the most plastic
are intensive olive groves, almonds, and table grapes, which represent more than 91% of total plastic
waste. The production of activated carbons (ACs) is a solution to avoid plastics landfill. ACs wereproduced from plastic used on food packaging (PB-Samples) and sheeting film (PS-Samples) byactivation with K
2
CO
3
. ACs presented well-developed textural properties (PB-K
2
CO
3
-1:1–700 andPS-K
2
CO
3
-1:1–700 exhibited a volume of 0.32 and 0.25 cm
3
g
−
1
and an apparent surface area of
723 and 623 m
2
g
−
1
, respectively). Both ACs performed very well concerning four pesticide removals
from the liquid phase. This solution is very promising, such these ACs could be applied in effluent treatments on a large scale
Influence of surface ionization on the adsorption of aqueous zinc species by activated carbons
PEEK: An excellent precursor for activated carbon production for high temperature application
AIQ2011: E se de repente Évora lhe oferecer Química?
O Ano de 2011 foi proclamado pelas Nações Unidas como Ano Internacional da Química. Tendo como mote "Química – A Nossa vida, O Nosso futuro" pretende celebrar as conquistas no mundo da Química e as suas contribuições para o bem-estar da Humanidade. Os principais objectivos do AIQ 2011 visam estimular o reconhecimento público da Química como ciência fundamental para a satisfação das necessidades da sociedade moderna, o interesse da Química na população jovem e, ainda, gerar entusiasmo para um futuro cada vez mais criativo da Química. Adicionalmente o ano de 2011 coincide com o 100º aniversário da atribuição do Prémio Nobel da Química à Madame Marie Curie o que constitui uma excelente oportunidade para a promoção e celebração dos contributos da mulher para a Ciência.
O Centro de Química de Évora (CQE) e o Departamento de Química da Escola de Ciências e Tecnologia da Universidade de Évora (DQUI), conscientes do seu papel fulcral na área da Química, fazem seus os objectivos do AIQ2011 e, para tal, dão, não só, continuidade a um conjunto de actividades que têm vindo a desenvolver desde o seu inicio e que pretendem levar a Química a Todos, mas também promovem uma série de novos eventos comemorativos do AIQ