Ricardo Correia

• MSc
• Universidade NOVA de Lisboa

Waste-grade cork samples of Quercus cerris were subjected to maceration extraction using 7 different solvents, including pure water (I), pure acetone (II), 75% aqueous ethanol (III), 75% aqueous methanol (IV), 75% aqueous acetone (V), 50% aqueous acetone (VI), and 25% aqueous acetone (VII). The extract yields, extract compositions, as well as antio...

Pine nut shells are waste lignocellulosic residues from the production of edible pine nut kernels that are generally only used for energy production by combustion. Lignocellulosic feedstocks, such as pine nut shells, may be valorized namely by their integration into biorefinery schemes. This article set out to analyze the chemical composition, morp...

The purpose of this work was to evaluate the recovery of bioactive extracts from Acacia dealbata leaves and twigs and to characterize their chemical composition and functional properties. Fresh and air-dried samples were extracted by maceration at room temperature and by hot extraction at 60 °C using aqueous solutions of acetone, ethanol, and metha...

In recent decades, interest in the eco-efficiency of building materials has led to numerous research projects focused on the replacement of raw materials with mineral and biomass wastes, and on the production of mortars with low-energy-consuming binders, such as gypsum. In this context, five different fractions (bark, wood, branchlets, leaves, and...

Co-torrefaction of microalgae and lignocellulosic biomass was evaluated as a method to process microalgae sludge produced from various effluents and to obtain biochars with suitable properties for energy or material valorization. The influence of four independent variables on biochar yield and properties was evaluated by a set of experiments define...

Acacia spp. are widespread all over the Portuguese territory, representing a threat to local biodiversity and to the productivity of the forest sector. The measures adopted in some countries for their eradication or to control their propagation are expensive, have been considered unfeasible from practical and economical perspectives, and have gener...

Pine wood transformation generates large amounts of pine wastes that are currently underexploited, however, their high content in polyphenols makes them attractive raw materials for biorefinery applications. In this work, the extraction of different phenolic compounds from pine bark was investigated varying the solvent, extraction temperature and t...

The impact of torrefaction and low-temperature carbonization on the properties of biomass wastes from Arundo donax L. and Phoenix canariensis was studied. Thermal treatments were performed at temperatures from 200 °C to 350 °C during 15 to 90 min and temperature was the parameter that more influenced mass and energy yields as well as biochar compos...

Present work aims to study the adsorption characteristics of biochars obtained from the gasification of different biomass wastes (acacia, olive bagasse and a mixture of several lignocellulosic materials), using a cationic dye model (Methylene Blue - MB) and an anionic one (Methyl Orange - MO). Results indicated that the biochar of acacia achieved i...

Present work aims to study the adsorption characteristics of biochars obtained from the gasification of different biomass wastes (acacia, olive bagasse and a mixture of several lignocellulosic materials), using a cationic dye model (Methylene Blue - MB) and an anionic one (Methyl Orange - MO). Results indicated that the biochar of acacia achieved i...

Herbaceous plant Arundo donax L. and the palm Phoenix canariensis, two abundant species in the municipality of Almada, were subjected to torrefaction at 200 ºC for 60 min and then tested as adsorbents for methylene blue (MB) dye. Our results shows that the pseudo-second order kinetics model is the most suitable to describe the data obtained, indica...

A utilização sustentável de biomassa para produção de bioenergia apela de forma crescente à utilização de resíduos de biomassa, em detrimento da utilização de biomassa dedicada, que compete com outras utilizações da terra. No entanto os resíduos de biomassa apresentam frequentemente baixa densidade aparente, elevado teor de humidade ou de cinzas e...