Percorrer por autor "Milani, Eduardo C."
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- Biomass-based materials for estrogens adsorption from water: production methods and their characterizationPublication . Milani, Eduardo C.; Menezes, Maraísa L.; Díaz de Tuesta, Jose Luis; Ribeiro, António E.; Brito, Paulo; Queiroz, AnaActivated carbons (ACs) are low-cost carbonaceous materials with a high surface area ranging from 500 to 3000 m2/g. ACs are produced by pyrolysis that consists of the combustion of organic matter above 500 °C in the absence of oxygen, to have the breaking of carbonic bonds and formation of porosity in the material. ACs are also undergo an activation process in order to increase its adsorption performance. Activation can be performed only by physical treatment, in which the organic material is thermal treated with an atmosphere of air, CO2, and water vapor, or also by applying some chemical treatments using generally, strong acids, chloride salts or strong bases [1, 2]. As carbon source for ACs preparation, many precursors have been tested, mainly biomass wastes (olive stones, rice husk, coconut shell, among others) [2]. According to the Instituto Nacional de Estatística (INE), in 2021 Portugal produced more than 1.3 million tons of olives and it is estimated that more than 500,000 tons of residues were generated per year [3]. This work aims to investigate different production methods of ACs from olive stones change and their effects on the characteristics of the resultant adsorbents
- Cork waste-based adsorbents for glycerol removal from biodiesel: a sustainable alternative to wet washingPublication . Garção, Maria Isabella Lima; Milani, Eduardo C.; Camilo, Gabriel L.; Diaz De Tuesta, Jose Luis; Gomes, Maria Carolina Sérgi; Ribeiro, António E.; Queiroz, Ana; Brito, PauloThis work aims to use activated carbon from industrial cork waste as a novel method for glycerol removal from crude biodiesel produced using waste cooking oil, combining two residues to obtain both high-quality biodiesel and highly adsorbent activated carbon. The study first optimizes the biodiesel production conditions, achieving the highest ester yield at 30 degrees C, with a 1:9 oil-to-ethanol molar ratio, 1 wt.% NaOH catalyst, and a reaction time of 1 h. Additionally, activated carbons were prepared and characterized from cork waste, showing significantly higher BET surface areas than the raw material. The most promising cork-based materials were then applied to optimize glycerol removal from crude biodiesel through adsorption. A preliminary study identified milled raw cork and its KOH-activated carbon (SBET = 2057 m2/g) as the most effective. Kinetic and equilibrium studies demonstrated that optimal glycerol removal was achieved after 6 h at 25 degrees C using 2 wt.% of KOH-activated cork-based adsorbent, resulting in 88% glycerol removal and a final glycerol content of 0.017 wt.%. These findings demonstrate that cork waste-derived activated carbon is highly effective for biodiesel purification, successfully meeting the quality specifications required by European Standard EN 14214:2012+A2:2019 and offering an innovative solution for waste valorization and sustainable fuel production.
- Preparação e caracterização de adsorventes obtidos de caroço de azeitona para remoção de estrogêniosPublication . Milani, Eduardo C.; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo; Menezes, Maraísa Lopes de
- Removal of estrogens from water using activated carbon from olive stonePublication . Milani, Eduardo C.; Menezes, Maraísa L.; Díaz de Tuesta, Jose Luis; Ribeiro, António E.; Brito, Paulo; Queiroz, AnaMicropollutants are substances that are continuously released to environments and can present adverse effects to the environment, even when present at very low concentrations (trace levels). Among these compounds are the estrogens pharmaceutical drugs, since traditional sewage and drinking water treatment plants are not able to remove or degrade them1,2. Thus, new and more efficient treatments are required, such advanced oxidation processes or adsorption. Activated carbons (ACs) are known as low-cost carbonaceous materials used for removal of pollutants using adsorption processes3,4. This work aims to produce ACs from olive stone and to evaluate the simultaneous removal of four different estrogens by adsorption with the produced materials. From the olive stone by product generated in the olive oil extraction, five different materials were produced, namely (i) powdered olive stone, (ii) physical activated at 800°C (iii) carbonized at 500°C, (iv) chemical activated using phosphoric acid and (v) chemical activated with sodium hydroxide. The carbonization yield was calculated and the pH at point of zero charge (pHPZC) of the carbonaceous materials determined. The simultaneous quantification of estriol, estrone, 17 -estradiol and 17 - ethinylestradiol in aqueous solution was performed by high performance liquid chromatography with diode array detector (HPLC-DAD). The highest carbonization yield (57.5%) was observed using acid activation. The adsorbents production method also influences the pHPZC of the adsorbents, being more expressive by the acid activation with the lowest pHPZC (3.84). The olive stone raw-material shows an important potential to be used on the production of activated carbons with high carbonization yields
- Removal of estrogens from water using activated carbon obtained from olive stonesPublication . Ribeiro, António E.; Milani, Eduardo C.; Menezes, Maraísa L.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Queiroz, AnaMicropollutants are natural or synthetic substances that are continuously released to aquatic environments that, even present at very low concentartions, such as µg/L or ng/L, can present adverse effects to the environment
- Removal of estrogens from water using activated carbon obtained from olive stonesPublication . Ribeiro, António E.; Milani, Eduardo C.; Menezes, Maraísa L.; Díaz de Tuesta, Jose Luis; Brito, Paulo; Queiroz, AnaMicropollutants are natural or synthetic substances that are continuously released to aquatic environments that, even present at very low concentrations, such as μg/L or ng/L, can present adverse effects to the environment [1]. Micropollutants include a huge range of compounds such as pharmaceuticals, hormones, cosmetics, disinfectants, pesticides, among others [2]. Estrogens are hormones that can be found naturally in fish, reptiles, birds, and mammals. The main therapeutic molecules of estrogens are 17ꞵ-Estradiol, Estriol and synthetic 17α-Ethinylestradiol normally used as contraceptives [3]. When present in water bodies, they can represent an environmental and health problem since traditional sewage and drinking water treatment plants are not able to remove or degrade this pharmaceutical compounds. This work will present some experimental studies for the removal of estrogens by adsorption using biomass-based materials, namely different types of activated carbon, obtained using olive stones as carbon source
- Removal of naproxen from water using adsorbents obtained from low-cost materialsPublication . Milani, Eduardo C.; Reis, Vinícius de Assis; Brito, Paulo; Queiroz, Ana; Ribeiro, António E.The continuous growth of world population together with the strong urbanization has triggered an increasing demand for freshwater which has resulted in a serious deterioration of water bodies1. Water pollution with pharmaceutical drugs is becoming a relevant problem. The concentration of nonsteroidal anti-inflammatory drugs, estrogens, personal care products, among others, in waterways is reaching hazardous levels, posing a threat to the environment and human health. Moreover, conventional cleaning and degradation processes applied on wastewater treatment plants are inefficient to eliminate or remove these compounds. Adsorption is a treatment process considered as effective process used to remove micropollutants such as pharmaceutical drugs from wastewaters2,3. This work will present the main experimental results obtained for the removal of naproxen, a representative anti-inflammatory drug, from water by adsorption using activated carbon obtained from olive stone. From the raw material, four different types of activated carbon adsorbent were prepared and characterized. The equilibrium adsorption isotherms were measured using the batch method. The most significant adsorption parameters were optimized, such as the solution pH, mass of the adsorbent, contact time and temperature. The physicochemical characterization of the pyrolyzed material shows a considerable superficial area of 608 m2/g when compared with other natural biomass-based materials. The adsorbent with the better performance allowed, using a contact time of 24 hr and a solution pH of 4.5, a removal efficiency of 100%. The Langmuir model was used to better described the adsorption behavior with the highest maximum adsorption capacity value of 35.2 mg naproxen/g adsorbent. The kinetics of the adsorption is well described by a pseudo-second order model.
- Removal of naproxen from water using adsorbents obtained from low-cost materialsPublication . Milani, Eduardo C.; Reis, Vinícius de Assis; Brito, Paulo; Queiroz, Ana; Ribeiro, António E.The continuous growth of world population together with the strong urbanization has triggered an increasing demand for freshwater which has resulted in a serious deterioration of water bodies [1]. Water pollution with pharmaceutical drugs is becoming a relevant problem. The concentration of non-steroidal anti-inflammatory drugs, estrogens, personal care products, among others, in waterways is reaching hazardous levels, posing a threat to the environment and human health. Moreover, conventional cleaning and degradation processes applied on wastewater treatment plants are inefficient to eliminate or remove these compounds. Adsorption is a treatment process considered as effective process used to remove micropollutants such as pharmaceutical drugs from wastewaters [2, 3]. This work will present the main experimental results obtained for the removal of naproxen, a representative anti-inflammatory drug, from water by adsorption using activated carbon obtained from olive stone. From the raw material, four different types of activated carbon adsorbent were prepared and characterized. The equilibrium adsorption isotherms were measured using the batch method. The most significant adsorption parameters were optimized, such as the solution pH, mass of the adsorbent, contact time and temperature. Four types of activated carbon materials were prepared from olive stones, the olive pits were powdered to an average diameter of 0.25 mm (type 1), then chemically activated with a strong acid (type 2) and then carbonized at 500ᵒC (type 3) or pyrolyzed at 800ᵒC (type 4). The batch method was applied to experimentally measure the equilibrium adsorption isotherms. The most significant adsorption parameters were optimized, such as the solution pH, mass of the adsorbent used, adsorption contact time and adsorption temperature.