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Mirtha Lourenço

Mirtha Lourenço
CICECO - Aveiro Institute of Materials · Chemistry Department

PhD

About

40
Publications
2,974
Reads
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402
Citations
Introduction
Mirtha A.O. Lourenço is a Researcher at CICECO-Aveiro Institute of Materials – University of Aveiro, Aveiro, Portugal. Here, she has been focusing on the synthesis and structural elucidation of functionalized porous silicas towards CO2 adsorption-separation under the EU-funded NMR4CO2 project.
Additional affiliations
November 2018 - April 2021
Istituto Italiano di Tecnologia
Position
  • PostDoc Position
May 2017 - October 2018
University of Aveiro
Position
  • PostDoc Position
November 2016 - April 2017
University of Aveiro
Position
  • Research Associate

Publications

Publications (40)
Article
Biochar, a carbon source, obtained from the valorization of biowaste from brewed coffee (COFF) and chitosan (CTO), were incorporated in different amounts in ZnO particles by co-precipitation method aiming to enhance ZnO photocatalytic properties. Oxidized biochar were also prepared to reduce their hydrophobicity and to enhance the interaction betwe...
Article
D-glucosamine is investigated as non-toxic and sustainable carbon/nitrogen source for the templated synthesis of nitrogen-containing CMK-8 ordered mesoporous carbons (NOMCs) conceived for selective CO2 uptake. Pyrolysis temperature is varied during nanocasting using KIT-6 silica hard template to tailor microporosity and nitrogen inclusions. NOMCs e...
Research Proposal
Full-text available
Dear all, we would like to invite you to submit your research to the Special Issue "Organic-Inorganic Hybrid Materials for Environmental Catalysis". https://www.mdpi.com/journal/catalysts/special_issues/Hybrid_cata
Article
Full-text available
Novel electrocatalysts based on zinc oxide (ZnO) and biochars are prepared through a simple and scalable route and are proposed for the electrocatalytic reduction of CO2 (CO2RR). Materials with different weight ratios of ZnO to biochars, namely, pyrolyzed chitosan (CTO) and pyrolyzed brewed waste coffee (CBC), are synthesized and thoroughly charact...
Article
Full-text available
The electrochemical reduction of carbon dioxide (CO2) to value-added chemicals and fuels has attracted worldwide interest for its potential to address various contemporary global issues such as CO2-related climate change, the earth’s carbon deficit and the energy crisis. In the development of this technology, many efforts have been focused on the d...
Poster
Full-text available
Dear all, we would like to invite you to submit your research to the Special Issue "Organic-Inorganic Hybrid Materials for Environmental Catalysis". https://www.mdpi.com/journal/catalysts/special_issues/Hybrid_cata
Article
Periodic mesoporous organosilicas (PMO) were proposed as potential adsorbents for CO2/CH4 adsorption-separation due to their strong interactions with CO2 and low affinity for CH4. Herewith, we present a comprehensive density functional theory (DFT) study about the binding properties of CO2 and CH4 with the pore walls of different PMO materials. The...
Article
Multi-walled carbon nanotubes (MWCNT) with different functionalities (standard-; OH-; and COOH- functionalized) are chemically modified with N¹-(3-trimethoxysilylpropyl)diethylenetriamine (DETASi) aiming to enhance their CO2 adsorption/separation properties. The grafting of the DETASi groups to the surface of the MWCNT samples is studied by X-ray p...
Article
Ethylene is a core building block in the chemical industry and its separation from ethane is very challenging due to high energy requirements. Adsorption-based processes can be an alternative. In this work, we explore for the first time the application of periodic mesoporous organosilica (PMO) materials, whose surface properties can be tuned with d...
Article
Aiming to evaluate how the release profile of naproxen (nap) is influenced by its physical state, molecular mobility, and distribution in the host, this pharmaceutical drug was loaded in three different mesoporous silicas differing in their architecture and surface composition. Unmodified and partially silylated MCM-41 matrices, respectively MCM-41...
Article
Full-text available
In the present study, two photocatalytic graphene oxide (GO) and carbon nanotubes (CNT) modified TiO 2 materials thermally treated at 300 • C (T300_GO and T300_CNT, respectively) were tested and revealed their conversion efficiency of nitrogen oxides (NO x) under simulated solar light, showing slightly better results when compared with the commerci...
Research Proposal
Full-text available
Dear all, I and Dr. Adriano Sacco would like to invite you to submit your research to the Special Issue of Catalysts in "Organic-Inorganic Hybrid Materials for Environmental Catalysis". https://www.mdpi.com/journal/catalysts/special_issues/Hybrid_cata#info
Poster
Full-text available
Dear all, we would like to invite you to submit your research to the Special Issue "Organic-Inorganic Hybrid Materials for Environmental Catalysis". https://www.mdpi.com/journal/catalysts/special_issues/Hybrid_cata#info
Article
Titanium oxide-based materials with different physical and chemical features were synthetized aiming at removing organic pollutants from both water and air media. The materials were produced employing two different heating methodologies (thermal, T and hydrothermal, H) at distinct temperatures resulting in porous materials. These materials were als...
Article
Climate change is leading to a gradual increase in the ocean temperature, which can cause physiological and biochemical impairments in aquatic organisms. Along with the environmental changes, the presence of emerging pollutants such as titanium oxide (TiO2) in marine coastal systems has also been a topic of concern, especially considering the inter...
Article
The functionalization of a paper mill sludge-based activated carbon (AC) was addressed in this work for the first time. Four different procedures have been accomplished in order to introduce amine functional groups (AC-NH2 and AC-APTES), thiol functional groups (AC-MPTMS), and a covalent organic polymer (AC-COP) onto the AC surface. The materials w...
Article
Titanium dioxide (TiO2) particles have been widely used in various industrial applications and consumer products. Due to their large production and use, they will eventually enter into aquatic environments. Once in the aquatic environment TiO2 particles may interact with the organisms and induce toxic effects. Since the most common crystallographic...
Article
Chitosan is a biopolymer obtained by deacetylation of chitin extracted from sub-products of the food industry and it is rich in nitrogen content. Pyrolyzed chitosan– and chitosan-periodic mesoporous organosilica (PMO)– based porous materials with different pore structures and chemical features are prepared using different dry methods and ensuing py...
Article
Periodic mesoporous organosilicas (PMOs) were suggested as potential adsorbents for CO2/CH4 separation because of their large affinities towards CO2 and low interaction with CH4. Herewith, we present a comprehensive computational study on the binding properties of flue gas species with the pore walls of periodic mesoporous phenylene-silica (Ph-PMO)...
Chapter
The world energy demands have been increasing in the last decades driven by strong economic growth and expanding populations. Alternative energy resources have been proposed to satisfy part of the energy needs. Biogas is an alternative energy source produced through the anaerobic digestion process of organic matter. Conventional and commercial proc...
Article
This research describes the synthesis and characterization of a periodic mesoporous organosilica (PMO) with low thiol density, and its efficiency to trap Hg(II) from waters under realistic environmental conditions. Despite the low density of SH groups grafted to the silanol groups of the pristine PMO, the functionalized material displays effective...
Article
N,N-dialkylation reaction of mesoporous aniline-silica is successfully achieved with nearly total conversion of the amine-phenylene periodic mesoporous organosilica (NH2-PMO) to the N,N-dialkylated amine material. Microwave-assisted dialkylation was optimized. Two cycles are required to promote the reaction of 2-bromopropane with the NH2-PMO and ob...
Article
Pristine, amino monofunctionalized and amino and thiol bifunctionalized phenylene-bridged periodic mesoporous organosilicas (Ph-PMO) were synthetized by a simple methodology without any protection/deprotection steps. The Ph-PMO materials were characterized and their potential as new sorbents for Hg(II) was investigated for low-contamination scenari...
Article
Periodic mesoporous organosilicas (PMO), with phenylene or biphenylene organic linkers, were thermally treated in flowing nitrogen atmosphere upon different conditions aiming the enhancement of their CO2 adsorption/separation properties. As-synthesized and template-extracted phenylene- and biphenylene-PMO were pyrolysed at 800 and 1200 °C. The effe...
Article
Efficient separation of CO2/CH4 is critical in biogas upgrading, requiring highly selective adsorbents. Based on the adsorption energies of -0.30 and -0.14 eV, previously calculated by dispersion corrected density functional theory for adsorption/desorption of CO2 and CH4 on the functionalized periodic mesoporous phenylene-silica material APTMS@Ph-...
Article
The synthesis and characterization of pristine and amine-functionalized periodic mesoporous phenylene-silicas having different pore sizes are reported. We explore the potential of these materials for CO2/CH4 separation, by studying the adsorption of pure CO2 and pure CH4 gases. The aminated periodic mesoporous phenylene-silica with the smallest por...
Article
Non-functionalized and functionalized periodic mesoporous phenylene-silicas (Ph-PMOs) with different kinds of amine groups were prepared and their capacity to uptake CO2 and CH4 molecules were experimentally evaluated considering biogas upgrading. It was found that aminopropyl groups grafted to the free silanols of the Ph-PMO displayed the highest...
Article
Copper(II) complexes with commercial chiral bis(oxazoline)s were for the first time directly coordinated onto amine-modified mesoporous phenylene and biphenylene silicas. All final materials maintained the 2D ordered mesoporous structure. The copper metal coordinates directly to the amine groups within the walls of the materials. The materials were...
Article
Full-text available
Nowadays, CO2/CH4 separation is considered extremely important with respect to making biogas economically viable. The search for efficient materials for biogas upgrading is at the cutting edge of research in the field of energy. Periodic mesoporous organosilicas (PMO) are highly suitable for application as selective adsorbents for CO2 as they have...
Chapter
Periodic Mesoporous Organosilicas (PMOs) were first described in 1999 and gained immediately a great interest due to their high potential of application in catalysis, adsorption, and separation fields. These materials are formed by condensation of a bissilylated organic bridge precursor in the presence of a structure-directing agent to create poros...
Article
In this paper we report a study on the optimization of the amination of periodic mesoporous phenylene-silica (PMO) using microwave heating. The optimization was carried out for two key steps in the reaction, namely, (1) nitration of the bissilylated phenylene bridge, and (2) reduction of the nitro group to a primary amine. The temperatures of both...
Article
Amination of crystal-like 1,4-phenylene-bridged periodic mesoporous organosilica (Ph-PMO) was achieved with about 35% conversion of phenylene groups. Ferrocenylimine groups were subsequently anchored onto this material by condensation of acetylferrocene with amino groups. Elemental analysis indicated that about 15% of amino groups in PMO-NH2 were d...
Article
Full-text available
N-Alkylation reaction of amine functionalized phenylene moieties in crystal-like mesoporous silica is successfully achieved with about 87% of conversion in two reaction cycles. A potassium iodide catalyzed method commonly used for the selective N-monoalkylation of aniline is adapted and optimized to the N-monoalkylation reactions of the amine funct...
Article
Full-text available
Chiral bis-MOP type diphosphines with alkyl and pyridyl bridges connecting the two binaphthyl units have been synthesized via NiCl2(dppe) assisted phosphination of the corresponding aryl triflates. The effect of the amount of the nickel complex on the reaction yield was investigated. Catalytic and even stoichiometric amounts of the complex proved t...
Article
A family of threefold symmetry phosphite ligands, P(O–BIN–OR)3 (BIN = 2,2′-binaphthyl; R = Me, Bn, CHPh2, 1-adamantyl), derived from enantiomerically pure (R)-BINOL, was developed. Cone angles within the range 240–270° were calculated for the phosphite ligands, using the computational PM6 Hamiltonian. Their rhodium complexes formed in situ showed r...
Article
Zinc and manganese complexes of porphyrin triads have been synthesized and are shown to be efficient as highly sensitive and selective tripod optical sensors for amines at the picomolar level.
Article
A series of bis-BINOL-2′,2″-propyl ethers with different substituents at the propyl ether bridge, were investigated in the asymmetric titanium catalysed ethylation of arylaldehydes with Et2Zn, with conversions up to 99% and enantiomeric excesses up to 80%. Semiempirical PM6 calculations indicate that the higher ability of the unsubstituted ligand t...

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Projects

Project (1)
Project
The scientific project is based on the synthesis of porphyrins and phthalocyanines for supramolecular functionalization of carbon structures to increase energy efficiency in photovoltaic devices such as sustainable alternative of renewable energy. Date: 27 July 2018 - 26 June 2021