22 documents found, page 1 of 3
Fluoxetine and Nutrients Removal from Aqueous Solutions by Phycoremediation
Silva, Andreia; Fernandes, Diana F.; Figueiredo, Sónia; Freitas, Olga; Delerue-Matos, CristinaThe tertiary treatment using microalgae offers an attractive alternative to the removal of low but relevant concentrations of pharmaceuticals from domestic wastewaters. The removal of fluoxetine from aqueous solutions by living and non-living (lyophilized) Chlorella vulgaris was assessed. The determination of the pH at the point of zero charge, Fourier transmittance infrared analysis, and scanning electron micr...
Removal of diclofenac and sulfamethoxazole from aqueous solutions and wastewate...
Soares, Cristina; Correia-Sá, Luísa; Paíga, Paula; Barbosa, Carlos; Remor, Paula Verônica; Freitas, Olga; Moreira, Manuela M.; Nouws, HenriThe three-dimensional (3D) electrochemical treatment process was studied for the removal of two pharmaceuticals, diclofenac (anti-inflammatory) and sulfamethoxazole (antibiotic), in mono and bi-component systems. Adsorption and conventional two-dimensional electrochemical processes were initially studied and then combined to develop the 3D process. The influence of different operating parameters on the removal ...
Fluoxetine Removal from Aqueous Solutions Using a Lignocellulosic Substrate Col...
Silva, Andreia; Sousa, Juliana; Hultberg, Malin; Figueiredo, Sónia; Freitas, Olga; Delerue-Matos, CristinaOne of the main challenges in both the design of new wastewater treatment plants and the expansion and improvement of existing ones is the removal of emerging pollutants. Therefore, the search for economic and sustainable treatments is needed to enhance the removal of pharmaceuticals. The potential of a lignocellulosic substrate colonized by Pleurotus ostreatus, a waste from mushroom production, to remove fluox...
Vermiculite as a potential functional additive for water treatment bioreactors ...
Węgrzyn, Agnieszka; Tsurtsumia, Avtandil; Witkowski, Stefan; Freitas, Olga; Figueiredo, Sónia; Cybińska, Joanna; Stawiński, WojciechA new adsorbent that combines mineral vermiculite with the yeast Saccharomyces cerevisiae, was used for Cd2+ removal. The influence of vermiculite presence on the toxic effects of Cd2+ to Saccharomyces cerevisiae yeast was evaluated as a function of the microorganisms' respiratory activity (CO2 production). The Cd2+ toxicity increased with prolonged exposure time reaching the LC50 value of 857 and 489 mg L−1 af...
Green Microalgae Scenedesmus Obliquus Utilization for the Adsorptive Removal of...
Silva, Andreia; Coimbra, Ricardo N.; Escapa, Carla; Figueiredo, Sónia; Freitas, Olga; Otero, MartaIn view of the valorisation of the green microalga Scenedesmus obliquus biomass, it was used for the biosorption of two nonsteroidal anti-inflammatory drugs, namely salicylic acid and ibuprofen, from water. Microalgae biomass was characterized, namely by the determination of the point of zero charge (pHPZC), by Fourier transform infrared (FT-IR) analysis, simultaneous thermal analysis (STA) and scanning electro...
Adsorption of Fluoxetine and Venlafaxine onto the Marine Seaweed Bifurcaria bif...
Silva, Andreia; Stawiński, Wojciech; Romacho, Juan; Santos, Lúcia H.M.L.M.; Figueiredo, Sónia; Freitas, Olga; Delerue-Matos, CristinaMarine macroalga Bifurcaria bifurcata was investigated as sorbent for two environmental emerging pollutants, the pharmaceuticals venlafaxine (VLF) and fluoxetine (FLX), from aqueous solutions, both in mono and bicomponent batch systems. The alga was characterized by means of IR spectroscopy, allowing to identify the most important groups for biosorption, carboxylic, sulfonic and hidroxile. The point of zero cha...
The Use of Algae and Fungi for Removal of Pharmaceuticals by Bioremediation and...
Silva, Andreia; Delerue-Matos, Cristina; Figueiredo, Sónia; Freitas, OlgaThe occurrence and fate of pharmaceuticals in the aquatic environment is recognized as one of the emerging issues in environmental chemistry. Conventional wastewater treatment plants (WWTPs) are not designed to remove pharmaceuticals (and their metabolites) from domestic wastewaters. The treatability of pharmaceutical compounds in WWTPs varies considerably depending on the type of compound since their biodegrad...
Study of adsorptive materials obtained by wet fine milling and acid activation ...
Węgrzyn, Agnieszka; Stawiński, Wojciech; Freitas, Olga; Komędera, Kamila; Błachowski, Artur; Jęczmionek, Łukasz; Dańko, Tomasz; Mordarski, GrzegorzWet fine milling, as a pretreatment step to acid activation of vermiculite, was applied in order to decrease the environmental impact of the procedure commonly used to increase the mineral's adsorption capacity. Milling caused fragmentation of the material and several changes in its structure: edges of the flocks became frayed, the surface cracked, cation exchange capacity (CEC) increased, and most of the iron ...
Sustainable adsorbents formed from by-product of acid activation of vermiculite...
Stawiński, Wojciech; Węgrzyn, Agnieszka; Mordarski, Grzegorz; Skiba, Michał; Freitas, Olga; Figueiredo, SóniaHydrotalcite-like layered double hydroxide (LDH) materials were synthesized from liquid waste by-product produced during acid activation of vermiculite (raw (W) and expanded (Ve)), and by combining the waste with the activated mineral, novel hybrid vermiculite-hydrotalcite-like materials were obtained in one-pot synthesis. Batch system adsorption experiments were performed on fresh and calcined (at 450 °C) mate...
Application of vermiculite-derived sustainable adsorbents for removal of venlaf...
Silva, Andreia; Martinho, Sílvia; Stawiński, Wojciech; Węgrzyn, Agnieszka; Figueiredo, Sónia; Santos, Lúcia H. M. L. M.; Freitas, OlgaRemoval of emerging pollutants, such as pharmaceuticals, from wastewater is a challenge. Adsorption is a simple and efficient process that can be applied. Clays, which are natural and low-cost materials, have been investigated as adsorbent. In this work, raw vermiculite and its three modified forms (expanded, base, and acid/base treated) were tested for removal of a widely used antidepressant, venlafaxine. Adso...