M.M. López Guerrero

• University of Malaga

Securing the enduring sustainability of global phosphorus (P) utilization has become a key societal priority. The application of green chemistry and green engineering presents an opportunity to mitigate these challenges...

This work presents a straightforward, highly sensitive, and cost-effective method for the simultaneous determination of V, Ti, Ni and Ga by high resolution-continuum source electrothermal atomic absorption spectrometer (HR-CS ETAAS)...

A new magnetic functionalized material based on graphene oxide magnetic nanoparticles named by us, M@GO-TS, was designed and characterized in order to develop a magnetic solid-phase extraction method (MSPE) to enrich inorganic and organic species of lead, mercury, and vanadium. A flow injection (FI) system was used to preconcentrate the metallic an...

A novel sorbent material employing magnetic nanoparticles (MNPs) coupled to graphene oxide (GO) functionalized with 4-aminobenzenesulfonic acid (M@GO-ABS) has been synthesized and applied to develop an inexpensive and automatic method for Cr(III) and Cr(VI) speciation in environmental samples; the developed method combines inductively coupled plasm...

Mercury is a non-essential trace element that is toxic to humans due to the bioaccumulation effect. In this work, a ferrofluid based on [email protected] oxide nanospheres together with an ionic liquid was used to develop a magnetic dispersive solid-phase extraction (MDSPE) method for the extraction of the complex formed between the chelating agent...

The application of nanoparticles (NPs) in science and technology is a fast growing field. Therefore, reliable and straightforward analytical methods are required for their fast determination in different types of samples. This work investigates a method that enables the determination of ZnO NPs, discriminating them from ionic zinc in cosmetic sampl...

An electrochemical analysis of B6 vitamins has been presented. The electrooxidation of vitamin B6 group and related compounds has been performed at neutral pH using glassy carbon and gold electrodes. Irreversible electrochemical processes are observed for these substances by cyclic voltammetry. The rate of the first or second electron transfer (E)...

A novel polymer inclusion membrane (PIM), doped with pyridine-2-acetaldehyde benzoylhydrazone (2-APBH) as extractant, was synthesized and applied for the simultaneous extraction and preconcentration of Cu(II), Ni(II) and Cd(II) ions from natural waters of different salinities. Poly(vinyl chloride) (PVC) and tributyl phosphate (TBP) were used to pre...

A new magnetic dispersive solid phase extraction (MDSPE) method and graphite furnace atomic absorption spectrometry (GFAAS) have been combined for the simultaneous enrichment of Cd and Pb from environmental water samples including seawater, and subsequent sequential determination of both analytes. For the preconcentration, a shell structured Fe3O4@...

In this work, the synthesis of new adsorbent nanomaterials based on the coupling of magnetic nanoparticles and graphene oxide (MNPs–GO) was addressed. Separately, MNPs and GO have adsorbent properties of great interest, but their use involves certain difficulties. The coupling seeks compensation for their disadvantages, while maintaining their exce...

The aim of this study is to evaluate the extraction capacity of a new functionalized magnetic graphene oxide (MGO) to be employed in the automatic simultaneous preconcentration-determination of a relatively large number of elements with different properties by inductively coupled plasma optical emission spectrometry (ICP OES). A multimode sample in...

The chiral separation of enantiomers is crucial for pharmacovigilance within drug discovery. Although a large number of prescribed medications are marketed as pure enantiomers, this is not always the case and many are in fact racemic mixtures. Drug scandals, such as that of Thalidomide in 1961, provide a clear example of the social and economic rep...

The main objective of this paper was to improve the learning of Chemistry subject using Flipped classroom, because it makes class time more engaging. The lecture portion of General Chemistry courses in engineer degrees have been pushed outside the classroom using pre recording technology and steaming delivery of content, to make classes more intera...

p>Se ha realizado un estudio sobre la influencia de las TIC en la enseñanza y aprendizaje de las ciencias, particularmente en el caso del aprendizaje de la Química, usando una tabla periódica virtual y una aplicación multimedia o simulador. Las TIC serán empleadas para mejorar la comprensión de uno de los conceptos químicos considerados más difícil...

A chelating sorbent which employs magnetic nanoparticles (MNPs) functionalized with 1,5-bis(di-2-pyridil)methylene thiocarbohydrazide (DPTH-MNPs) was used to develop a simple method for the analysis of trace amounts of metal ions (As, Sb and Hg) present in environmental samples combining on-line magnetic solid phase extraction (MSPE) with atomic sp...

Arsenic, one of the main environmental pollutants and potent natural poison, is a chemical element that is spread throughout the Earth's crust. It is well known that the toxicity of arsenic is highly dependent on its chemical forms. Generally, the inorganic species are more toxic than its organics forms, and As(III) is 60 times more toxic than As(V...

A chelating sorbent which employs magnetic nanoparticles (MNPs) functionalized with 1,5-bis(di-2-pyridil)methylene thiocarbohydrazide (DPTH-MNPs) was used to develop a simple method for the analysis of trace amounts of metal ions present...

A green and simple method has been proposed in this work for the simultaneous determination of V, Ni and Fe in fuel ash samples by solid sampling high resolution continuum source graphite furnace atomic absorption spectrometry (SS HR CS GFAAS). The application of fast programs in combination with direct solid sampling allows eliminating pretreatmen...

In the last years, there is a clear increasing trend in the number of works dealing with magnetic nanomaterials for pre-concentration and/or separation of ions, organic and inorganic compounds, as well as tools for biomedical purposes because of the low toxicity, biocompatibility and biodegradability. The excellent properties of these nanomaterials...

A rapid and simple method was developed for separation and pre-concentration of mercury by flow injection solid phase extraction coupled with on-line chemical vapour generation electrothermal atomic absorption spectrometry (CV-HG ETAAS). The system is based on chelating retention of the analyte onto the mini column filled with a new nanosorbent, me...

Esta investigación supone un acercamiento al estudio de la percepción de los estudiantes de ingenierías sobre la utilidad de la química para su formación. Se pretende averiguar el grado de utilidad que conceden a la química los estudiantes de primer curso del Grado de Ingeniería Mecánica. Para ayudar a los estudiantes a mejorar su visión sobre su u...

Magnetic nanoparticles (MNPs) are a new kind of nanometer-sized superparamagnetic material with potential applications as magnetic carriers for various biomedical uses, wastewater remediation, preconcentration of various anions and cations, etc. The excellent properties of MNPs are strongly influenced by the size of the nanoparticles. Another impor...

Se ha realizado un estudio sobre la mejora producida al emplear un blog en el aprendizaje de las ciencias experimentales, utilizándose como estrategia que permite favorecer el aprendizaje de los alumnos/as y fomentar su participación en la asignatura. Se ha realizado un estudio cualitativo sobre el uso del blog y su influencia positiva para mejorar...

A new chelating sorbent which employs magnetic nanoparticles (MNPs) functionalized with 1,5-bis(di-2-pyridil)methylene thiocarbohydrazide (DPTH-MNPs) was synthetized and characterized. The aim of the synthesis of this material was to develop fast and simple methods for analysis of trace amounts of metal ions present in biological and environmental...

Silica-coated magnetic nanoparticles (MNPs) modified with [1,5-bis (2-pyridyl)-3-sulphophenyl methylene] thiocarbonohydrazide (PSTH-MNPs) were synthesized and characterized. These magnetic nanoparticles (PSTH-MNPs) were employed as a solid phase extraction (SPE) adsorbent for separating and concentrating trace amounts of 14 elements (Pd, Cr, Mn, Zn...

Chemistry is a subject many students prefer to avoid, even if they have an interest in science, because of its reputation for lowering grade point averages. However, it isn't as bad as it seems.Chemistry has a reputation as being a difficult subject to master, but there are steps you can take to improve your chances of success. The key to learning...

Chemistry is a subject many students prefer to avoid, even if they have an interest in science, because of its reputation for lowering grade point averages. However, it isn't as bad as it seems.Chemistry has a reputation as being a difficult subject to master, but there are steps you can take to improve your chances of success. The key to learning...

Membranes are alternative solution for industrial and domestic separation processes, from water treatment, gas separation, and electrochemical devices. The urgency to limit landfill and petroleum dependency leads the development of new environmentally friendly and economic barrier materials as protective packaging applications (Piringer & Baner, 20...

1. Introduction – The significant progress in the development of new renewable energy in recent years, fossil fuels still occupy a dominant position in the worldwide energy supply for the near future. The separation and capture of CO2 from flue gas is becoming important for greenhouse emission. The membrane-based separation process use to remove CO...

The separation and capture of CO 2 from these sources is becoming important for greenhouse emission. The membrane-based separation process use to remove CO 2 takes advantages in energy efficient and environmentally friendly aspects and has been recognized as an important technology for CO 2 capture and gas separation. The novel mixed matrix membran...

Hydroxyanthraquinone derivatives are identified as synthetic receptors of anions giving the possibility of sensing, coding and doing quantitative determination in aqueous solutions of several anions. Interactions between receptor/acceptor are discussed in this paper. An anion selective receptor which is an underdeveloped field has been developed. T...

A rapid method was developed for separation, pre-concentration and sequential determination of antimony, bismuth, tin and mercury by flow injection solid phase extraction coupled with on-line chemical vapor generation electrothermal atomic absorption spectrometry. The system is based on chelating/cationic retention of the analytes onto a mini-colum...

The applicability of phase-resolved fluorescence spectroscopy has been shown for the resolution of mixtures of two diuretics (furosemide and triamterene) with closely overlapping fluorescence profiles. Phase-resolved intensity spectra were used to estimate the steady-state fractional intensities using a method based on nulling the contribution of o...

The separation and capture of CO 2 from these sources is becoming important for greenhouse emission. The membrane-based separation process use to remove CO 2 takes advantages in energy efficient and environmentally friendly aspects and has been recognized as an important technology for CO 2 capture and gas separation. The novel mixed matrix membran...

A simple, sensitive, low-cost and rapid flow injection (FI) on-line sorption preconcentration/hydride generation system has been synchronously coupled to an electrothermal atomic absorption spectrometer (ETAAS) for the determination of trace amounts of Sb in aqueous environmental samples (river and sea water samples). The system is based on retenti...

Most chemistry teaching operates at the macro level, and it is well known, that many misconceptions in chemistry stem from an inability to visualize structures and processes at the micro level. Thanks to this multimedia application in which the micro level is shown, can be compelling and effective learning resources. However, the multimedia applica...

Mixed matrix membranes (MMMs) were prepared by incorporating organic surfactant-free hydrothermally synthesised ETS-10 and 1-ethyl-3-methylimidazolium acetate ionic liquid (IL) to chitosan (CS) polymer matrix. The membrane material characteristics and permselectivity performance of the two-component membranes were compared with the three-component...

Titania biomorphic ceramics were manufactured from wood preforms by a two steps process, i.e. infiltration and then pyrolysis in an inert atmosphere to produce porous TiC ceramics, followed by infiltration and pyrolysis in an air atmosphere where TiC was oxidized to TiO2. This technology provides a cost effective and eco-friendly route to advanced...

There are only a few analytical techniques available that have sufficient sensitivity and selectivity for the determination and speciation of chromium in environmental waters. In this work, a non-chromatographic system is developed for the simultaneous determination of chromium(III) and chromium(VI) by solid phase extraction and inductively coupled...

Zirconium carbide-based biomorphic ceramics have been manufactured by vacuum infiltration of zirconium-oxychloride (ZrOCl2·8H2O) sol into natural wood. After vacuum-assisted infiltration, the specimens were dried in air and pyrolysed at 800 °C in Ar-atmosphere. The infiltration and drying process were repeated up to four times. Finally, the specime...

A method was developed to determine solvent viscosity of several solvent mixtures, including glycerol/water, ethylene glycol/water and 1,2-propane diol/ethylene glycol, using fluorescent probes as reporter and time-resolved fluorescence anisotropy to measure modulation anisotropy ratios (MAR) as analytical signal, obtained in the frequency domain b...

Simultaneous determination of non-fluorescent glycols in mixtures without separation or chemical transformation steps is described. Two methods based in the measure of fluorescence anisotropy of a probe such as fluorescein dissolved in the analyte or analyte mixtures are described. In the first method, the anisotropy spectra of pure and mixtures of...

Two individual components in mixtures have been resolved by frequency domain fluorescence technique by measuring the observable quantities which characterize the anisotropy decay; differential anisotropy phase and modulated anisotropy ratio (MAR), which in turn are related to the rotational correlation time. The method presented here is capable of...