Loading...
4 results
Search Results
Now showing 1 - 4 of 4
- Activated Carbon Produced from Tanning Industry Residues Used to Remove Carbamazepine from WastewaterPublication . Marques, David; Freitas, Maria Madalena; Silva, P. C.According to UNESCO, emerging pollutants are posing a threat to ecosystems and human health. These compounds can be either synthetic or natural chemicals or microorganisms, that are not usually regulated, and can be found in hospital wastewater, even after conventional treatment processes. Carbamazepine is a mood stabilizing drug and an anticonvulsant. Due to its persistence, carbamazepine is one of the most frequently detected pharmaceuticals in wastewater. Though there are many methods to remove such pollutants, adsorption is one of the most effective treatments. To remove carbamazepine from solution, an activated carbon prepared from leather residues and a commercial activated carbon were used as adsorbents. The adsorption tests show that the leather residue derived activated carbons have higher specific surface area (>1500 m’/g) and higher adsorption capacity (q > 300 mgcnz/g) for carbamazepine when compared to commercial activated carbon (992 m’/g and q < 180 mgcaz/g, respectively).
- Preparation of activated and N-doped carbons derived from pineconesPublication . Farias, A.; Monteiro, A.; Freitas, M.M.; Silva, P.C.(Introduction) The increasing impact of environmental issues has driven the development of increasingly cleaner and renewable processes and products. Biomassderived carbons have gained significant attention due to their high specific surface areas, hierarchical porous structures, cost-effectiveness and widespread availability [1]. Given the growing interest in these materials, the substitution of carbon atoms with heteroatoms (N, B, P and S) within the carbonaceous structure emerges as a mechanism to enhance the material's acid-base character. It can also alter the electronic structure of carbon, potentially increasing its electrical conductivity, chemical stability, and electron-donation properties [2]. This study aims to develop carbon materials from pinecones with high surface area, doped with nitrogen.
- Ciprofloxacin and carbamazepine adsorption on activated carbons produced from leather residuesPublication . Marques, David; Mota, Salomé; Freitas, Maria Madalena; Silva, Paula CristinaCiprofloxacin and carbamazepine adsorption was studied using an activated carbon produced from leather residues (wet white shavings) and a commercially available activated carbon (Norit ROW 0.8) and the effect of pH level was studied. The activated carbon produced from wet white shavings showed better results due to its higher specific surface area, confirming that leather residues are a viable precursor for the preparation of activated carbons for the adsorption of these chemicals. The effect of pH on the AC adsorption capacity was not significant in the case of carbamazepine, however lower pH led to higher adsorption capacities for ciprofloxacin.
- Preparação de materiais de carbono de elevada área superficial contendo azotoPublication . Monteiro, A.S.; Freitas, M.M.; Silva, P.C.(Introdução) O carvão ativado é um material adsorvente aplicado em áreas como o tratamento de efluentes líquidos e gasosos, a purificação e separação de misturas gasosas ou em catálise. A dopagem de carvão ativado com azoto, criando na superfície grupos funcionais azotados, permite a sua utilização em novas áreas emergentes como o armazenamento de eletricidade ou a captura de dióxido de carbono. Assim, o desenvolvimento de métodos de produção de materiais de carbono de elevada área superficial contendo azoto a partir de resíduos é uma área de grande interesse.