75 documents found, page 1 of 8
Salinity-dependent impacts on the effects of antiepileptic and antihistaminic d...
Almeida, Ângela; Calisto, Vânia; Esteves, Valdemar I.; Schneider, Rudolf J.; Soares, Amadeu M. V. M.; Freitas, RosaIn coastal systems, pollutants as pharmaceutical drugs exert changes from the molecular to the organism level in marine bivalves. Besides pollutants, coastal systems are prone to changes in environmental parameters, as the alteration of salinity values because of Climate Change. Together, these stressors (pharmaceutical drugs and salinity changes) can exert different threats than each stressor acting individual...
Solidified floating organic drop microextraction (SFODME) for the simultaneous ...
Silva, Lanna K.; Rangel, José H. G.; Brito, Natilene M.; Sousa, Eliane R.; Sousa, Érika M. L.; Lima, Diana L. D.; Esteves, Valdemar I.In this work, a liquid-liquid microextraction methodology using solidified floating organic drop (SFODME) was combined with liquid chromatography and UV/Vis detection to determine non-steroidal anti-inflammatory drugs (NSAIDs) naproxen (NPX), diclofenac (DCF), and mefenamic acid (MFN) in tap water, surface water, and seawater samples. Parameters that can influence the efficiency of the process were evaluated, s...
Impact of UASB reactors operation mode on the removal of estrone and 17α-ethiny...
Louros, Vitória L.; Lima, Diana L. D.; Leitão, Jorge H.; Esteves, Valdemar I.; Nadais, Helena G. A.This work aims to compare the performance of the continuous operation (CO) and intermittent operation (IO) of upflow anaerobic sludge blanket (UASB) reactors for the removal of estrone (E1) and 17α-ethinylestradiol (EE2) from wastewaters. Results suggest that the IO contribute to the improvement of the overall removal of estrogens (above 95% for E1 and EE2) when compared to CO (49% for E1 and 39% for EE2). For ...
Producing magnetic nanocomposites from paper sludge for the adsorptive removal ...
Rocha, Luciana S.; Sousa, Érika M. L.; Gil, María V.; Oliveira, João A. B. P.; Otero, Marta; Esteves, Valdemar I.; Calisto, VâniaIn view of a simple after-use separation, the potentiality of producing magnetic activated carbon (MAC) by intercalation of ferromagnetic metal oxide nanoparticles in the framework of a powder activated carbon (PAC) produced from primary paper sludge was explored in this work. The synthesis conditions to produce cost effective and efficient MACs for the adsorptive removal of pharmaceuticals (amoxicillin, carbam...
Biochar-TiO2 magnetic nanocomposites for photocatalytic solar-driven removal of...
Silva, Carla Patrícia; Pereira, Diogo; Calisto, Vânia; Martins, Manuel A.; Otero, Marta; Esteves, Valdemar I.; Lima, Diana L. D.Contamination of surrounding waters with antibiotics by aquaculture effluents can be problematic due to the possible increase of bacterial resistance, making it crucial the efficient treatment of those effluents before their release into the environment. In this work, the application of waste-based magnetic biochar/titanium dioxide (BC/TiO2) composite materials on the photodegradation of two antibiotics widely ...
Sustainable and recoverable waste-based magnetic nanocomposites used for the re...
Rocha, Luciana S.; Sousa, Érika M.L.; Pereira, Diogo; Gil, María V.; Otero-Irurueta, Gonzalo; Hortigüela Gallo, María J.; Otero, MartaThis work aimed at producing easily recoverable magnetic iron-oxide functionalized activated carbons (AC) through environmentally and energetically sustainable methods, evaluating their efficacy towards the removal of the pharmaceuticals diclofenac (DCF) and venlafaxine (VEN) from different aqueous matrices (ultrapure water and wastewater treatment plant effluents). Two AC were prepared by chemical activation o...
Can ocean warming alter sub-lethal effects of antiepileptic and antihistaminic ...
Almeida, Ângela; Calisto, Vânia; Esteves, Valdemar I.; Schneider, Rudolf J.; Figueira, Etelvina; Soares, Amadeu M. V. M.; Freitas, RosaThe negative effects induced in marine organisms by Climate Change related abiotic factors consequences, namely ocean warming, are well-known. However, few works studied the combined impacts of ocean warming and contaminants, as pharmaceutical drugs. Carbamazepine (CBZ) and cetirizine (CTZ) occur in the marine environment, showing negative effects in marine organisms. This study aimed to evaluate the impacts of...
Recent advances on the development and application of magnetic activated carbon...
Rocha, Luciana S.; Pereira, Diogo; Sousa, Érika; Otero, Marta; Esteves, Valdemar I.; Calisto, VâniaThe adsorption of pharmaceutical substances using carbonaceous materials, such as activated carbon (AC), biochar (BC) and hydrochar (HC), has received substantial attention by researchers working on water treatment, due to the simplicity, low-cost and high performance of this process. In order to widen the potentiality of these carbonaceous materials and to overcome some of their limitations, particularly the i...
Monitoring pharmaceuticals in the aquatic environment using enzyme-linked immun...
Jaria, Guilaine; Calisto, Vânia; Otero, Marta; Esteves, Valdemar I.The presence of pharmaceuticals, which are considered as contaminants of emerging concern, in natural waters is currently recognized as a widespread problem. Monitoring these contaminants in the environment has been an important field of research since their presence can affect the ecosystems even at very low levels. Several analytical techniques have been developed to detect and quantify trace concentrations o...
Photodegradation of sulfadiazine in different aquatic environments: evaluation ...
Louros, Vitória Loureiro dos; Silva, Carla Patrícia; Nadais, Helena; Otero, Marta; Esteves, Valdemar I.; Lima, Diana L. D.The presence of antibiotics, such as sulfadiazine (SDZ), in the aquatic environment contributes to the generation of antimicrobial resistance, which is a matter of great concern. Photolysis is known to be a major degradation pathway for SDZ in surface waters. Therefore, influencing factors affecting SDZ photodegradation in different aquatic environments were here eval...