50 documents found, page 1 of 5
Production of highly oxidized starch in a flow cell using a nickel anode
Muiuane, V. P.; Neves, Isabel C.; Bettencourt, Ana Paula; Parpot, PierThis study emphasizes the potential of using sustainable and low-cost methods to process biopolymers, contributing to eco-friendly biorefinery technologies. In this context, the transformation of potato starch, a readily available biopolymer, into carboxylic acid starch (CAS) with high yield using an electrochemical process was achieved. As a result of the green transformation, the potato starch was oxidized in...
Facile preparation of a Pt-ERGO composite modified screen-printed electrode for...
Bento, M. Fátima; Bettencourt, Ana Paula; Oliveira, Raquel; Lema, Luís; Amorim, IsildaThe mass production of screen-printed electrochemical devices with integrated electrodes has facilitated the widespread adoption of electroanalytical methods. The SPEs (screen-printed electrodes) overcome some obstacles associated with the use of conventional electrochemical cells, making them accessible to untrained operators. Despite their advantages, SPEs require activation/ modification of the working elect...
Evaluation of municipal waste compost in relation to the environmental retentio...
Bento, M. Fátima; Bettencourt, Ana Paula; Geraldo, Dulce; Ramísio, Paulo J.; Andrade, Otília Teresa Antunes RodriguesThis study investigates the performance of municipal compost as a heavy metals adsorbent 1 for environmental protection systems. The performed assays test the effects of pH (2-9) and contact time (5-250 minutes) on metal retention. To simulate leaching in natural systems, the soluble organic fraction was removed, leading to variations in the surface properties, including a 10% increase of cation exchange capaci...
Comparison of cadmium binding by humic and fulvic acids extracted from compost ...
Rocha, P.; Silva, Ana Catarina; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Fiol, S.; Geraldo, Dulce; López, R.; Macías, F.; Pinheiro, J. P.Compost is a bio-sustainable material produced by the controlled decomposition of the organic wastes. Composting can be employed for the urban organic waste treatment in alternative to incineration or landfill disposal [1]. The properties of compost are closely related to the presence of humic-like substances (HS). Both fulvic acids (FA) and humic acids (HA) contain a significant amount of carboxylic acids and ...
Comparison of cadmium binding by humic and fulvic acids extracted from two comp...
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Fiol, S.; Geraldo, Dulce; López, F.; Macías, F.; Pinheiro, J. P.Composting has been proven to be an environmentally friendly process for urban organic waste, that can represent an opportunity for new uses under the circular economy framework. The binding of cadmium to fulvic-like and humic-like acids extracted from compost of algae and urban residues were evaluated, and the results show significant differences. The fulvic and humic acids from algae compost bind cadmium more...
Avaliação da capacidade de composto produzido industrialmente para remoção de p...
Andrade, O. T.; Bettencourt, Ana Paula; Ramísio, Paulo J.; Bento, M. Fátima; Geraldo, Dulce; Proença, M. Fernanda R. P.O composto é um material produzido pela decomposição de matéria orgânica através de um processo denominado de compostagem. Neste processo ocorre uma estabilização da matéria orgânica, com formação de moléculas ricas em estruturas aromáticas contendo grupos hidroxilo e carbonilo [1]. Estas estruturas químicas, usualmente classificadas de substâncias húmicas, oferecem um enorme potencial para estabelecer interaçõ...
Characterization of organic matter at different stages of a composting process
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Bento, M. Fátima; Bettencourt, Ana Paula; Ferreira, Paula M. T.; Fiol, S.; Geraldo, Dulce; López, R.The characterization of the organic matter from raw organic wastes, unmatured compost and maturated compost was performed by different techniques: gravimetric, FTIR-ATR, TGA and from the ability of their extracts to bind Cd2+ (evaluating the free cadmium ion by AGNES). Although the amount of humic-like and fulvic-like acids did not change significantly, the structure and properties of the organic matter changed...
Comparison of cadmium binding by humic and fulvic acids extracted from compost ...
Rocha, Pedro; Silva, Ana Catarina; Antelo, Juan; Bento, M. Fátima; Bettencourt, Ana Paula; Fiol, Sarah; Geraldo, Dulce; López, Rocio; Macias, Felipe[Excerpt] Introduction: Composting is a natural process of decomposition and stabilization of organic matter. Domestic or industrial composting is an environmental friendly alternative method to handle organic wastes [1]. The organic matter formed by composting, usually denominated by humic substances (HS), can be divided into three classes, humic acids (HA), fulvic acids (FA) and humin (HM) according to their ...
Characterization of organic matter at different stages of a composting process
Silva, Ana Catarina; Rocha, José Pedro Pereira Rebelo; Bento, M. Fátima; Bettencourt, Ana Paula; Geraldo, Dulce; Ferreira, Paula M. T.; Paiva, Maria C.[Excerpt] Assessment of the impact of the composting time on the properties of waste samples at different stages of composting through different characterization methods: spectroscopic (ATR-FTIR), thermal (DSC and TGA) and electrochemical (AGNES).
Implementação do Sistema de Gestão da Qualidade no laboratório químico-agrícola...
Bettencourt, Ana Paula; Faria, Pedro; Mendes, ÂngelaCom a entrada de Portugal na Comunidade Económica Europeia foi necessário desenvolver uma política nacional de qualidade surgindo então o Instituto Português da Qualidade (IPQ), um instituto público criado com o objetivo de garantir “a procura da qualidade de produtos e serviços para o aumento da qualidade de vida dos cidadãos, aumento da competitividade das atividades económicas num contexto de progressiva lib...