D.Fabio Mercado

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• PhD in Chemistry
• Researcher at National University of Colombia

Carbon dots have been synthesized through a pyrolysis route with agroindustrial wastes of Yerba Mate (YM), Avocado Seed (AS), and Orange Peel (OP) as raw materials. The selection of the pyrolysis temperature was according to the thermogravimetric profile of the raw materials. A thorough characterization by transmission electron microscopy (TEM), ζ-...

Seven composites of iron oxide nanoparticles embedded in organic microparticles mediated by Cu(II) were synthesized using yerba mate (Ilex paraguariensis) dry leaf extract as precipitant, capping agent, and dispersant medium, using different Cu/ Fe molar ratios. A thorough characterization of the particles by transmission electron microscopy (TEM),...

Fe2O3, V2O5, NiO, MnO2, and MoO3 nanomaterials were synthesized and used as adsorbents as well as catalysts in low-temperature oxidation of asphaltenes. The acidity of the metal cations seems to be the predominant factor improving adsorption capability. Further, RTO, TGA and DSC techniques evinced catalytic properties for all the studied materials...

Two carbon dots (CD) with diameters of 4.9 ± 1.5 and 4.1 ± 1.2 nm were successfully synthesized through an acid abla-tion route with HNO 3 or H 2 SO 4 , respectively, using Ilex paraguariensis as raw material. The CD were used to produce magnetite-containing nanocomposites through two different routes: hydrothermal and in situ. A thorough character...

This study aims to explore the adsorption behavior of four pharmaceuticals: ciprofloxacin (CIP), sulfamethoxazole (SUL), diclofenac (DIC), and acetaminophen (ACE) on activated carbons produced from rice husk using different NaOH-based protocols at 800°C. The main objective is to assess and compare the efficiency of activated carbons synthesized by...

Due to the increasing energy demand and the depletion of light crude oil, the exploitation of heavy crude oil fields is being considered as an alternative. In-situ combustion is an enhanced oil recovery thermal technique that involves injecting air or oxygen into the well to promote partial oxidation of the oil. However, the initial ignition of com...

Curcumin is a polyphenolic compound recently studied as a potential therapeutic agent for cancer treatment. However, this molecule possesses low solubility in water which complicates its direct use in the organism, making it essential to find a drug delivery system to carry this molecule through hydrophilic environments. To achieve this, carbon dot...

Nanoparticles are of great interest in material science due to their characteristics, such as high surface area, biocompatibility, and unique optical properties. Within the search for more ecological and efficient pathways to synthesize nanoparticles, there is a special interest in the synthesis of bacterial biofilms. Biofilms are self-organized co...

TiO2/SO4 2- surfaces obtained by plasma electrolytic oxidation were used for the reduction of Cr(VI) to Cr(III) present in wastewater, in order to study the behavior of TiO2/SO4 2- in Cr(VI) and Cr(III) ion adsorption by X-ray photoelectron spectroscopy and density functional theory calculations. Highresolution X-ray photoelectron spectra showed th...

This work reports S-TiO2 doped coatings to reduce Cr6+ to Cr3+ obtained from a Ti electrode through the Plasma Electrolytic Oxidation (PEO) process. The Ti sheets (20 x 20 x 1 mm) were submerged on 0.1 M H2SO4, and values of the duty cycle from 2% to 50% were applied to obtain various materials. SEM, XRD, AFM, XPS, and DRS techniques were used to c...

Nanocomposites of iron-doped hydroxyapatite and carbon dots were synthesized through green synthesis processes, using Yerba Mate (Ilex paraguariensis) as a precursor. A thorough characterization of the particles was carried out by HRTEM, XRD, FTIR, DLS, XPD, and static contact angle. The characterization indicated that the crystallinity, surface ch...

This study presents the use of Ilex paraguariensis, an agro-industrial waste, to obtain multiple nanomaterials through serial processes. The materials synthesized included organic-coated magnetite (Fe3O4@YM), Carbon dots (CD), SiO2 materials, and a magnetite-CD composite (Fe3O4@CD). The characterization of these materials showed that they have nano...

There has been a growing interest in applying nanoparticles for enhanced oil recovery. Within this context, there is a need to understand the influence of the factors involved in the formulation of nanoparticle based emulsions over their properties. In this contribution, functionalized SiO2 nanoparticles of two different sizes were synthesized and...

Amphiphilic nanomaterials interact with water/oil interfaces, catalyzing reactions in the In-Situ Combustion (ISC) process. This work aims to compare the surface modification of different crystalline phases of MnO2 in the two most relevant processes involved in ISC: transportation and catalysis, by evaluating the stability of nanofluids and their c...

Newtonian nanoparticulate TiO2 sols without and with Pr3+ doping (0.5, 1, 2, 3, 5, and 10 mol%) were synthesized by the aqueous colloidal sol-gel method, next elucidating that the Pr3+ doping increasingly retards their peptization while makes them more viscous at high doping contents. Subsequently, undoped and Pr3+-doped TiO2 xerogels were obtained...

Magnetic nanoparticles (MNPs) uniquely combine superparamagnetic performance with dimensions that are smaller than or similar size to molecular analytes. Recently, functionalized MNPs are predicted to be a driver for technology and business in this century and hold the promise of high performance materials that will significantly influence all aspe...

Three low-cost and abundant agro-industrial residues have been used as hexavalent chromium adsorbents. Blackberry residues and spent ground coffee were the most efficient adsorbents with 10.6 ± 5.9 and 9.7 ± 3.0 mg g⁻¹ maximum adsorption uptake, respectively. With a capacity of 1.4 ± 0.1 mg g⁻¹, avocado seeds showed the lowest adsorption efficiency...

A wet-synthetic method is described to obtain magnetic, air-stable, zero-valent iron nanoparticles coated with an alkanedioic acid. The particles can be immobilized in an amino-substituted polysiloxane matrix to provide materials capable of dechlorinating, debrominating, and deiodinating a wide variety of halogenated organic molecules dissolved ini...

A co-precipitation synthesis method was used to obtain iron oxide nanoparticles coated with Yerba Mate (Ilex paraguariensis) extract. These particles have a core-shell structure with the iron oxide phase surrounded by an organic shell provided by an organic component which come from the Yerba Mate extract. Obtained nanoparticles were exhaustively c...

Single-crystal 15 nm size magnetite nanoparticles were synthesized and coated with Yerba Mate (Ilex paraguariensis) extract to evaluate their use as versatile antioxidant magnetic nanoadsorbents. The obtained particles, Mnp@YM, were found to be composed of a crystalline magnetite core surrounded by a shell composed of Fe3O4, FeO, and Fe2O3 oxides....

The capability of paramegnetic iron-containing hydroxyapatite (Fe-nAp) and waste bioorganic subtrates templeted iron-containing hydroxyapatite (SBO-Fe-nAp) nanoparticles, as Pb(II) cations adsorbants were investigated and compared to those of synthetic hydroxyapatite (nAp). Surface and bulk characterization techniques as XPS, XRD, electrophoretic m...

This paper describes the synthesis of paramegnetic iron-containing hydroxyapatite nanoparticles and their increased Cu2+ sorbent capacity when using Ca2+ complexes of soluble bio-organic substrates from urban wastes as synthesis precursors. A thorough characterization of the particles by TEM, XRD, FTIR spectroscopy, specific surface area, TGA, XPS,...