19 documents found, page 1 of 2
Tailored cellulose-based flocculants for microplastics removal: mechanistic ins...
Magalhães, Solange; Norgren, Magnus; Alves, Luís; Medronho, Bruno; Rasteiro, Maria da GraçaThis study explores the performance of novel cellulose-derived sustainable flocculants in the flocculation of different model microplastics (MPs), including polyethylene (PE), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). The influence of key parameters, such as pH, flocculant structure and concentration was evaluated by Laser Diffraction Spectroscopy (LDS) and optical microscopy to access thei...
Effect of chitosan properties and dissolution state on solution rheology and fi...
Araújo, Francisca; Magalhães, Solange; Medronho, Bruno; Eivazi, Alireza; Dahlström, Christina; Norgren, Magnus; Alves, LuísChitosan films with potential application in triboelectric nanogenerators (TENGs) represent a promising approach to replace non-biobased materials in these innovative devices. In the present work, chitosan with varying molecular weights (MW) and degrees of deacetylation was dissolved in aqueous acetic acid (AA) at different acid concentrations. It was observed that the MW had a greater influence on the viscosit...
Innovative approaches to mitigating microplastic pollution in effluents and soils
Magalhães, Solange; Alves, Luís; Medronho, Bruno; Svanedal, Ida; Norgren, Magnus; Rasteiro, Maria GraçaMicroplastic pollution represents a significant environmental challenge, as microplastics accumulate in effluents and soils, causing serious risks to ecosystems and human health. Efficient removal of these contaminants is essential to mitigate their potential adverse effects. This review summarizes and critically analyses current methods for the removal of microplastics from effluents and soils, focusing on the...
Stacking self-gluing cellulose II films: a facile strategy for the formation of...
Dahlström, Christina; Duan, Ran; Eivazi, Alireza; Magalhães, Solange; Alves, Luís; Engholm, Magnus; Svanedal, Ida; Håkan Edlund; Medronho, BrunoCellulose laminates represent a remarkable convergence of natural materials and modern engineering, offering a wide range of versatile applications in sustainable packaging, construction, and advanced materials. In this study, novel all-cellulose laminates are developed using an environmentally friendly approach, where freshly regenerated cellulose II films are stacked without the need for solvents (for impregn...
Insights on microplastic contamination from municipal and textile industry effl...
Magalhães, Solange; Paciência, Daniel; Rodrigues, João M. M.; Lindman, Björn; Alves, Luís; Medronho, Bruno; Rasteiro, Maria da GraçaThe rampant use of plastics, with the potential to degrade into insidious microplastics (MPs), poses a significant threat by contaminating aquatic environments. In the present study, we delved into the analysis of effluents from textile industries, a recognized major source of MPs contamination. Data were further discussed and compared with a municipal wastewater treatment plant (WWTP) effluent. All effluent sa...
Lignin-furanic rigid foams: Enhanced methylene blue removal capacity, recyclabi...
Duarte, Hugo; Brás, João; Saoudi Hassani, El Mokhtar; Aliaño González, María José; Magalhães, Solange; Alves, Luís; Valente, Artur J. M.Worldwide, populations face issues related to water and energy consumption. Water scarcity has intensified globally, particularly in arid and semiarid regions. Projections indicate that by 2030, global water demand will rise by 50%, leading to critical shortages, further intensified by the impacts of climate change. Moreover, wastewater treatment needs further development, given the presence of persistent organ...
Enhancing cellulose and lignin fractionation from acacia wood: optimized parame...
Magalhães, Solange; Aliaño González, María José; Rodrigues, Mariana; Fernandes, Catarina; Mendes, Cátia V. T.; Carvalho, Maria Graça V. S.; Alves, LuísCellulose and lignin, sourced from biomass, hold potential for innovative bioprocesses and biomaterials. However, traditional fractionation and purification methods often rely on harmful chemicals and high temperatures, making these processes both hazardous and costly. This study introduces a sustainable approach for fractionating acacia wood, focusing on both cellulose and lignin extraction using a deep eutect...
Anionic bio-flocculants from sugarcane for purification of sucrose: An applicat...
Leão, Sofia; Magalhães, Solange; Alves, Luís; Gamelas, José A. F.; Lima, Claudio; Stein, Bruno; Rasteiro, Maria da GraçaIn sugar production, polyacrylamide-based anionic flocculants are added for juice treatment, the main objective being to remove impurities that affect the quality of the sugar. However, if they remain in the final product, those polymers can present carcinogenic and neurotoxic actions besides contaminating the soils where the waste is discharged. To overcome this problem, the present study proposes, for the fir...
Eco-friendly Methods for Extraction and Modification of Cellulose: An Overview
Magalhães, Solange; Fernandes, Catarina; Pedrosa, Jorge F. S.; Alves, Luís; Medronho, Bruno; Ferreira, Paulo J.; Rasteiro, Maria da GraçaCellulose is the most abundant renewable polymer on Earth and can be obtained from several different sources, such as trees, grass, or biomass residues. However, one of the issues is that not all the fractionation processes are eco-friendly and are essentially based on cooking the lignocellulose feedstock in a harsh chemical mixture, such as NaOH + Na2S, and water, to break loose fibers. In the last few years, ...
Eco-friendly methods for extraction and modification of cellulose: an overview
Magalhães, Solange; Fernandes, Catarina; Pedrosa, Jorge F. S.; Alves, Luís; Medronho, Bruno; Ferreira, Paulo J. T.; Rasteiro, Maria da GraçaCellulose is the most abundant renewable polymer on Earth and can be obtained from several different sources, such as trees, grass, or biomass residues. However, one of the issues is that not all the fractionation processes are eco-friendly and are essentially based on cooking the lignocellulose feedstock in a harsh chemical mixture, such as NaOH + Na<sub>2</sub>S, and water, to break loose fibers. In the last ...