13 documents found, page 1 of 2
Optimizing microwave-assisted production of waste-based activated carbons for t...
Sousa, Érika; Rocha, Luciana; Jaria, Guilaine; Gil, Maria V.; Otero, Marta; Esteves, Valdemar; Calisto, VâniaThis work aimed at the microwave-assisted production of activated carbon (AC) from primary paper mill sludge (PS) for the adsorption of antibiotics from water. Production conditions, namely pyrolysis temperature, pyrolysis time and activating agent (KOH):PS ratio, were optimized as a function of product yield, specific surface area (SBET), total organic carbon (TOC) content and adsorptive removal percentage of ...
Effects of thiol functionalization of a waste-derived activated carbon on the a...
Jaria, Guilaine; Calisto, Vânia; Gil, Maria Victoria; Ferreira, Paula; Santos, Sérgio M.; Otero, Marta; Esteves, Valdemar I.An activated carbon was produced from paper mill sludge (AC-P) and functionalized with thiol groups (AC-MPTMS) for the adsorptive removal of the antibiotic sulfamethoxazole (SMX) from buffered solutions prepared in ultrapure water (pH 8) and real wastewater samples. The physicochemical properties of the two materials (AC-P and AC-MPTMS) showed differences, mainly in specific surface area (SBET), in the type of ...
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...
Core-shell molecularly imprinted polymers on magnetic yeast for the removal of ...
Liang Qiu; Jaria, Guilaine; Gil, María Victoria; Jundong Feng; Yaodong Dai; Esteves, Valdemar I.; Otero, Marta; Calisto, VâniaIn this work, magnetic yeast (MY) was produced through an in situ one-step method. Then, MY was used as the core and the antibiotic sulfamethoxazole (SMX) as the template to produce highly selective magnetic yeast-molecularly imprinted polymers (MY@MIPs). The physicochemical properties of MY@MIPs were assessed by Fourier-transform infrared spectroscopy (FT-IR), a vibrating sample magnetometer (VSM), X-ray diffr...
Fixed-bed performance of a waste-derived granular activated carbon for the remo...
Jaria, Guilaine; Calisto, Vânia; Silva, Carla Patrícia; Gil, María Victoria; Otero, Marta; Esteves, Valdemar I.This work aimed to assess the fixed-bed adsorptive performance of a primary paper mill sludge-based granular activated carbon (PSA-PA) for the removal of pharmaceuticals, namely carbamazepine (CBZ), sulfamethoxazole (SMX) and paroxetine (PAR), from water. The breakthrough curves corresponding to the adsorption of CBZ at different flow rates and in two different matrices (distilled and urban wastewater) were fir...
Obtaining granular activated carbon from paper mill sludge: a challenge for app...
Jaria, Guilaine; Calisto, Vânia; Silva, Carla Patrícia; Gil, María Victoria; Otero, Marta; Esteves, Valdemar I.In this work, a granular activated carbon (GAC) was produced using primary paper mill sludge (PS) as raw material and ammonium lignosulfonate (AL) as binder agent. PS is a residue from the pulp and paper industry and AL is a by-product of the cellulose pulp manufacture and the proposed production scheme contributes for their valorisation together with important savings in GAC precursors. The produced GAC (named...
Adsorption of pharmaceuticals from biologically treated municipal wastewater us...
Silva, Carla Patrícia; Jaria, Guilaine; Otero, Marta; Esteves, Valdemar I.; Calisto, VâniaA waste-based alternative activated carbon (AAC) was produced from paper mill sludge under optimized conditions. Aiming its application in tertiary wastewater treatment, AAC was used for the removal of carbamazepine, sulfamethoxazole, and paroxetine from biologically treated municipal wastewater. Kinetic and equilibrium adsorption experiments were run under batch operation conditions. For comparison purposes, t...
Effect of the surface functionalization of a waste-derived activated carbon on ...
Jaria, Guilaine; Lourenço, Mirtha A. O.; Silva, Carla Patrícia; Ferreira, Paula; Otero, Marta; Calisto, Vânia; Esteves, Valdemar I.The functionalization of a paper mill sludge-based activated carbon (AC) was addressed in this work for the first time. Four different procedures have been accomplished in order to introduce amine functional groups (AC-NH2 and AC-APTES), thiol functional groups (AC-MPTMS), and a covalent organic polymer (AC-COP) onto the AC surface. The materials were characterized showing that the functionalization was succeed...
Production of highly efficient activated carbons from industrial wastes for the...
Jaria, Guilaine; Silva, Carla Patrícia; Oliveira, João A. B. P.; Santos, Sérgio M.; Gil, María Victoria; Otero, Marta; Calisto, VâniaThe wide occurrence of pharmaceuticals in aquatic environments urges the development of cost-effective solutions for their removal from water. In a circular economy context, primary paper mill sludge (PS) was used to produce activated carbon (AC) aiming the adsorptive removal of these contaminants. The use of low-cost precursors for the preparation of ACs capable of competing with commercial ACs continues to be...
Waste-based alternative adsorbents for the remediation of pharmaceutical contam...
Silva, Carla Patrícia; Jaria, Guilaine; Otero, Marta; Esteves, Valdemar I; Calisto, VâniaWhen adsorption is considered for water treatment, commercial activated carbon is usually the chosen adsorbent for the removal of pollutants from the aqueous phase, particularly pharmaceuticals. In order to decrease costs and save natural resources, attempts have been made to use wastes as raw materials for the production of alternative carbon adsorbents. This approach intends to increase efficiency, cost-effec...