110 documents found, page 1 of 11
Study of biodiesel production from waste cooking oil by ethyl transesterificati...
Camilo, Gabriel L.; Queiroz, Ana; Ribeiro, António E.; Gomes, Maria Carolina Sérgi; Brito, PauloThe world production of biodiesel in 2020 reached approximately 46 million tons, with 10% of the total amount representing biodiesel from waste cooking oils (WCO) [1]. The cost of conventional biodiesel production is higher than of diesel from petroleum, since it is carried out mainly from high quality virgin oils. It is estimated that 70 to 80% of the total cost of biodiesel production is associated with the c...
Study of biodiesel production from waste cooking oil by ethyl transesterificati...
Camilo, Gabriel L.; Gomes, Maria Carolina Sérgi; Queiroz, Ana; Ribeiro, António E.; Brito, PauloBiodiesel production from waste cooking oil (WCO) has become an economic opportunity and an environmental strategy to help address the global challenges of renewable energy production. Considering classical industrial processes for biodiesel production, adsorption and ion exchange technologies are the most commonly used alternatives for crude biodiesel purification. These methods, also known as dry cleaning met...
Biodiesel production from residual cooking oils and its purification through ad...
Garção, Maria Isabella Lima; Queiroz, Ana; Brito, Paulo; Ribeiro, António E.; Gomes, Maria Carolina SérgiBiodiesel is a renewable fuel that can be produced from waste cooking oil mainly through transesterification. However, from its production results a contaminant called glycerol, which must be removed. Wet washing is the most common method for biodiesel purification, but it has several drawbacks, including high costs and the generation of large amounts of aqueous effluent. This study proposes using activated car...
Purification of biodiesel using a natural based adsorbent in a packed-bed column
Smolich, Camilla G.; Guimarães, Miriam D.; Fabian, João Vitor; Gomes, Maria Carolina Sérgi; Queiroz, Ana; Ribeiro, António E.; Brito, PauloIn Europe, the Renewable Energy Directiva stimulates the development of renewable energy sources to reduce greenhouse gas emissions by at least 55% by the year 2030 and to become aclimate-neutral continent by 2050 [1]. Biodiesel presents advantages over diesel fuel in terms of sulfur content, biodegradability, flash point, no aromatic content, higher cetane number and miscibility in petroleum diesel in any rati...
Biodiesel production from waste cooking oils catalysed by ionic liquid [BMIM][H...
Almeida, Fretson Micaela; Queiroz, Ana; Ribeiro, António E.; Brito, PauloThe environmental and energy problems related to the burning of fuels from fossil resources, i.e. nonrenewable fuels such as oil, natural gas or coal, leading to an increased concern about global warming, have directed the scientific community to seek sustainable and renewable energy alternatives. In this context, biofuels have emerged as a promising way to replace non-renewable fuels, including biodiesel [1]. ...
Valorisation of waste cooking oils through conversion processes to biodiesel ca...
Monteiro, Fábio; Queiroz, Ana; Ribeiro, António E.; Brito, PauloTo date, fossil fuels prevail as the primary source of energy, with a high consumption in transport and industries, making them a major problem for our planet, given its weak environmental sustainability due to its high greenhouse gas emissions to the atmosphere and the limited reserves [1]. In this context, biodiesel emerges as a biofuel, biodegradable, environmentally sustainable and less toxic when compared ...
Evaluation of activated carbon obtained from olive stones for the removal of se...
Belgacem, Mohamed Ben; Ribeiro, António E.; Queiroz, Ana; Brito, PauloThe presence of pharmaceutical drugs, their metabolites and degradation products in the environment requires significant research and monitoring studies to assess the potential risks to human health and to the ecosystem. Due to the extremely low concentrations of these chemicals in the environment in the removal processes must be optimized in order to make them easier, quicker, less expensive, and more environm...
Biomass-based materials for estrogens adsorption from water: production methods...
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. Activ...
Removal of estrogens from water using activated carbon obtained from olive stones
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
Biomass-based residues valorization for the removal of sertraline from waters b...
Ribeiro, António E.; Belgacem, Mohamed Ben; Queiroz, Ana; Brito, PauloPharmaceutical drug reach the environment through several anthropogenic sources being scattered and accumulated