Maibelin Rosales | McGill University (original) (raw)

Papers by Maibelin Rosales

Polymer Bulletin, Aug 3, 2017

The effect of the incorporation during the interfacial polymerization process of copper-oxide (Cu... more The effect of the incorporation during the interfacial polymerization process of copper-oxide (CuO) nanoparticles in thin-film composite (TFC) reverse osmosis (RO) membrane on their antibiofouling and desalinization performance have been studied. Membranes were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), zeta potential and contact angle measurements. Bactericidal tests were performed using Escherichia coli and anti-adhesion properties were confirmed by fluorescence microscopy. Membrane performance using a cross flow cell was evaluated. XRD and SEM-EDX analyses confirmed the incorporation of these nanoparticles into the membrane. Similar contact angle, higher surface roughness and less negatively charged surface on modified membrane compared to that of the pristine membrane were observed. However, an excellent anti-adhesion and bactericidal effect were observed, mainly attributed to the copper toxicity. The desalination performance of the modified membrane showed an important salt rejection with stable water flux. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes during the interfacial polymerization process is a potential alternative method to improve the antibiofouling capacities without impairing the performance of the membrane.

Zenodo (CERN European Organization for Nuclear Research), Apr 27, 2020

Acute Cr VI water pollution due to anthropogenic activities is an increasing worldwide concern. T... more Acute Cr VI water pollution due to anthropogenic activities is an increasing worldwide concern. The high toxicity and mobility of Cr VI makes necessary to develop dual adsorbent/ion-reductive materials that are able to capture Cr VI and transform it efficiently to less hazardous Cr III . The accurate description of the chromium speciation at the adsorbent/ion-reductive matrix is key to assess whether Cr VI is completely reduced to Cr III , or if its incomplete transformation led to the stabilization of highly reactive Cr V transient species within the material. With this goal in mind, a dual ultraviolet visible and electron paramagnetic spectroscopy approach has been applied to determine the Cr speciation within Zr-based metal-organic frameworks (MOFs). Our findings point out that the generation of defect positions at Zr-MOFs boost Cr VI adsorption, whilst the presence of reductive groups at the organic linkers play a key role to stabilize it as Cr III isolated and/or clustered ions.

Zenodo (CERN European Organization for Nuclear Research), Jan 9, 2023

Polymer Bulletin, 2017

The effect of the incorporation during the interfacial polymerization process of copper-oxide (Cu... more The effect of the incorporation during the interfacial polymerization process of copper-oxide (CuO) nanoparticles in thin-film composite (TFC) reverse osmosis (RO) membrane on their antibiofouling and desalinization performance have been studied. Membranes were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), zeta potential and contact angle measurements. Bactericidal tests were performed using Escherichia coli and anti-adhesion properties were confirmed by fluorescence microscopy. Membrane performance using a cross flow cell was evaluated. XRD and SEM-EDX analyses confirmed the incorporation of these nanoparticles into the membrane. Similar contact angle, higher surface roughness and less negatively charged surface on modified membrane compared to that of the pristine membrane were observed. However, an excellent anti-adhesion and bactericidal effect were observed, mainly attributed to the copper toxicity. The desalination performance of the modified membrane showed an important salt rejection with stable water flux. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes during the interfacial polymerization process is a potential alternative method to improve the antibiofouling capacities without impairing the performance of the membrane.

Journal of Electroanalytical Chemistry

Nanomaterials, Nov 30, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

As(III) to As(V) photo-oxidation capacity of Ti-MIL-125 metal organic frameworks is explored

We have explored the potentials of zirconium MOF materials to capture different metal ion cationi... more We have explored the potentials of zirconium MOF materials to capture different metal ion cationic and anionic species following two different approaches, ligand and metal functionalization paths. In the first approach, a group of Zr-therepthalate (UiO-66) [3] based materials has been synthesised and deeply characterized, varying the ligand functionalization and defect density of the framework. Their performance as both Cr(VI) adsorbents and reducers has been assessed, studying the chromium speciation after the process. In the second approach, a cluster functionalization of zirconium trimesate material (MOF-808) [4] has been applied, anchoring amino acids and natural carboxylic acids to the framework that varies the metal specificity of the initial adsorbent.

Journal of Nanomaterials, 2013

Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at diff... more Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at different temperatures (350, 650, and 960 ∘ C). The effect of calcination temperature on structural properties and photocatalytic activity of ceria nanopowder was also tested. Degradation of an azo dye, Congo Red (CR) as a model aqueous pollutant, was investigated by means of photocatalysis of ceria nanoparticles under visible light irradiation. The influence of catalyst amount, initial CR concentrations, and degradation reaction kinetics were studied. The results were compared with commercial CeO 2 at the same degradation conditions.

Journal of Materials Science, 2018

In situ formation of a Cu-(m-phenylenediamine) (Cu-mPD) oligomer complex from copper chloride dur... more In situ formation of a Cu-(m-phenylenediamine) (Cu-mPD) oligomer complex from copper chloride during the interfacial polymerization process was successfully employed to produce modified thin-film composite reverse osmosis membranes (TFC-RO) with antibiofouling properties. Membranes were characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy, and contact angle measurements. Antibiofouling properties were studied using a colony-forming unit test with Escherichia coli. Moreover, an antiadhesion test was developed using fluorescence microscopy. Membrane performance using a cross-flow cell was evaluated, and copper concentration in permeate water was measured. FTIR, XPS and XRD results confirmed the formation of a Cu-mPD oligomer complex and its incorporation into the polyamide layer. A mechanism for formation of the oligomer within the membrane was proposed based on the interaction between the oxygen of the carbonyl group of the polyamide layer and copper ion of the Cu-mPD oligomer complex. The modified membrane showed a slight decrease in hydrophilicity and higher surface roughness. However, excellent antibacterial and antiadhesion effects were observed, attributed to copper toxicity as a result of Cu 2? ions release from the membrane surface. Release of copper ions in the permeate water was determined, and the maximum value observed was considered negligible according to the World Health Organization. The desalination performance of modified membrane showed an important salt rejection with stable water flux. In conclusion, a novel chemical method for the incorporation of Cu-mPD oligomer complex into the polyamide layer of TFC-RO membranes to improve their antibiofouling properties and desalination performance was achieved.

Journal of Alloys and Compounds, 2020

Abstract Discovery of novel multifunctional photoluminescence materials are of great concern to t... more Abstract Discovery of novel multifunctional photoluminescence materials are of great concern to the development of disciplinary crossing and integration. In this study, BaTiO3@ZnO multifunctional heterostructures and BaTiO3@ZnO:Eu were prepared via the combined sol-gel-hydrothermal methods. The structure, nanoparticle morphology, and optical properties of the heterostructure are discussed. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), XPS, and Raman and photoluminescence spectra were used to characterize and monitor the heterostructure formation process. The results demonstrate that the Eu3+ ions were successfully incorporated into the ZnO matrix to form heterostructure BaTiO3@ZnO:Eu. Moreover, the optical and photoluminescence properties were investigated. The X-ray diffraction pattern shows that the BaTiO3@ZnO:Eu heterostructure is consistent with the relative intensities and positions of the peaks in the XRD, SAED and TEM spectra of BaTiO3 (BT) and ZnO:Eu, which are of rod-like shape. The intrinsic deep defect emission of ZnO and the transition emissions of both 5D0→7F1 at 593 nm and 5D0→7F2 at 616 nm, which are related to Eu3+, have been observed under excitation at 394 nm. The decrease in bandgap in response to increased doping and the addition of ZnO to BT can be attributed to the creation of sub-bands within the ZnO band range, thereby resulting in the continuous band effect and, consequently, band narrowing, which can provide guidance for the potential application for use in optical devices.

Journal of Nanomaterials, 2013

Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at diff... more Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at different temperatures (350, 650, and 960°C). The effect of calcination temperature on structural properties and photocatalytic activity of ceria nanopowder was also tested. Degradation of an azo dye, Congo Red (CR) as a model aqueous pollutant, was investigated by means of photocatalysis of ceria nanoparticles under visible light irradiation. The influence of catalyst amount, initial CR concentrations, and degradation reaction kinetics were studied. The results were compared with commercial CeO2 at the same degradation conditions.

Modern Environmental Science and Engineering

The use of reverse osmosis membranes (RO) is the most used technology for water desalination; how... more The use of reverse osmosis membranes (RO) is the most used technology for water desalination; however, membrane biofouling is considered a critical issue affecting desalination plants. The incorporation of nanoparticles with antimicrobial properties into RO membranes has been reported as an effective route for enhancing the antibiofouling properties but could diminish the performance of desalination. The aim of this work was to study the performance of antibiofouling of thin film composite (TFC-RO) membrane by incorporating antimicrobial copper-oxide (CuO) nanoparticles. These nanoparticles were incorporated within the structure of the membrane during the interfacial polymerization process. The membranes were characterized by scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscope (EDX) and atomic force microscopy (AFM) in order to observe the morphology and verify the incorporation of nanoparticles within them. Bactericidal tests were performed using Escherichia coli. Anti-adhesion on the membranes was confirmed using epifluorescence microscopy. Membranes performance were evaluated in terms of permeate flux and salt rejection by using a cross flow test cell. FESEM and EDX analyses confirmed the incorporationof nanoparticles into the membrane. These membranes showed significant anti-bacterial and excellent anti-adhesion effect attributed to the copper toxicity. Desalination performance of modified membranes showed an important salt rejection of about 98% with stable water flux about 36 L.m −2 .h −1 and a recovery of 50%. Measure copper concentrations in the permeate water shows to be negligible, indicating that the copper is not leached. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes improves the antibiofouling capacities without impairing the performance of the membrane.

Abstract: Carbon materials were obtained by pyrolysis of the sawdust of Algarroba wood under CO2 ... more Abstract: Carbon materials were obtained by pyrolysis of the sawdust of Algarroba wood under CO2 or N2 atmospheres at temperatures from 200ºC up to 900ºC. Carbon materials were characterized by surface and micropore areas, volume pore and mean pore diameter. An approach of the kinetic parameters (apparent constant-rates and activation energies) as-sociated with the synthesis of these carbon materials is also presented. From the kinetic data of thermal degradation of Al-garroba wood, three different pyrolysis zones were verified. First, an incipient carbonization between 200 up to 350ºC, second an extensive carbonization between 350 up to 600ºC, and a third step involving the pore formation at temperatures higher than 600ºC. As a target application of carbon materials, results of phenol adsorption and phenol photodegradation under UV-irradiation indicated the potential of carbon materials in presence of TiO2 for treatment of polluted waters.

Journal of Environmental Chemical Engineering

Polymer Bulletin, Aug 3, 2017

The effect of the incorporation during the interfacial polymerization process of copper-oxide (Cu... more The effect of the incorporation during the interfacial polymerization process of copper-oxide (CuO) nanoparticles in thin-film composite (TFC) reverse osmosis (RO) membrane on their antibiofouling and desalinization performance have been studied. Membranes were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), zeta potential and contact angle measurements. Bactericidal tests were performed using Escherichia coli and anti-adhesion properties were confirmed by fluorescence microscopy. Membrane performance using a cross flow cell was evaluated. XRD and SEM-EDX analyses confirmed the incorporation of these nanoparticles into the membrane. Similar contact angle, higher surface roughness and less negatively charged surface on modified membrane compared to that of the pristine membrane were observed. However, an excellent anti-adhesion and bactericidal effect were observed, mainly attributed to the copper toxicity. The desalination performance of the modified membrane showed an important salt rejection with stable water flux. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes during the interfacial polymerization process is a potential alternative method to improve the antibiofouling capacities without impairing the performance of the membrane.

Zenodo (CERN European Organization for Nuclear Research), Apr 27, 2020

Acute Cr VI water pollution due to anthropogenic activities is an increasing worldwide concern. T... more Acute Cr VI water pollution due to anthropogenic activities is an increasing worldwide concern. The high toxicity and mobility of Cr VI makes necessary to develop dual adsorbent/ion-reductive materials that are able to capture Cr VI and transform it efficiently to less hazardous Cr III . The accurate description of the chromium speciation at the adsorbent/ion-reductive matrix is key to assess whether Cr VI is completely reduced to Cr III , or if its incomplete transformation led to the stabilization of highly reactive Cr V transient species within the material. With this goal in mind, a dual ultraviolet visible and electron paramagnetic spectroscopy approach has been applied to determine the Cr speciation within Zr-based metal-organic frameworks (MOFs). Our findings point out that the generation of defect positions at Zr-MOFs boost Cr VI adsorption, whilst the presence of reductive groups at the organic linkers play a key role to stabilize it as Cr III isolated and/or clustered ions.

Zenodo (CERN European Organization for Nuclear Research), Jan 9, 2023

Polymer Bulletin, 2017

The effect of the incorporation during the interfacial polymerization process of copper-oxide (Cu... more The effect of the incorporation during the interfacial polymerization process of copper-oxide (CuO) nanoparticles in thin-film composite (TFC) reverse osmosis (RO) membrane on their antibiofouling and desalinization performance have been studied. Membranes were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), zeta potential and contact angle measurements. Bactericidal tests were performed using Escherichia coli and anti-adhesion properties were confirmed by fluorescence microscopy. Membrane performance using a cross flow cell was evaluated. XRD and SEM-EDX analyses confirmed the incorporation of these nanoparticles into the membrane. Similar contact angle, higher surface roughness and less negatively charged surface on modified membrane compared to that of the pristine membrane were observed. However, an excellent anti-adhesion and bactericidal effect were observed, mainly attributed to the copper toxicity. The desalination performance of the modified membrane showed an important salt rejection with stable water flux. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes during the interfacial polymerization process is a potential alternative method to improve the antibiofouling capacities without impairing the performance of the membrane.

Journal of Electroanalytical Chemistry

Nanomaterials, Nov 30, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

As(III) to As(V) photo-oxidation capacity of Ti-MIL-125 metal organic frameworks is explored

We have explored the potentials of zirconium MOF materials to capture different metal ion cationi... more We have explored the potentials of zirconium MOF materials to capture different metal ion cationic and anionic species following two different approaches, ligand and metal functionalization paths. In the first approach, a group of Zr-therepthalate (UiO-66) [3] based materials has been synthesised and deeply characterized, varying the ligand functionalization and defect density of the framework. Their performance as both Cr(VI) adsorbents and reducers has been assessed, studying the chromium speciation after the process. In the second approach, a cluster functionalization of zirconium trimesate material (MOF-808) [4] has been applied, anchoring amino acids and natural carboxylic acids to the framework that varies the metal specificity of the initial adsorbent.

Journal of Nanomaterials, 2013

Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at diff... more Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at different temperatures (350, 650, and 960 ∘ C). The effect of calcination temperature on structural properties and photocatalytic activity of ceria nanopowder was also tested. Degradation of an azo dye, Congo Red (CR) as a model aqueous pollutant, was investigated by means of photocatalysis of ceria nanoparticles under visible light irradiation. The influence of catalyst amount, initial CR concentrations, and degradation reaction kinetics were studied. The results were compared with commercial CeO 2 at the same degradation conditions.

Journal of Materials Science, 2018

In situ formation of a Cu-(m-phenylenediamine) (Cu-mPD) oligomer complex from copper chloride dur... more In situ formation of a Cu-(m-phenylenediamine) (Cu-mPD) oligomer complex from copper chloride during the interfacial polymerization process was successfully employed to produce modified thin-film composite reverse osmosis membranes (TFC-RO) with antibiofouling properties. Membranes were characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy, and contact angle measurements. Antibiofouling properties were studied using a colony-forming unit test with Escherichia coli. Moreover, an antiadhesion test was developed using fluorescence microscopy. Membrane performance using a cross-flow cell was evaluated, and copper concentration in permeate water was measured. FTIR, XPS and XRD results confirmed the formation of a Cu-mPD oligomer complex and its incorporation into the polyamide layer. A mechanism for formation of the oligomer within the membrane was proposed based on the interaction between the oxygen of the carbonyl group of the polyamide layer and copper ion of the Cu-mPD oligomer complex. The modified membrane showed a slight decrease in hydrophilicity and higher surface roughness. However, excellent antibacterial and antiadhesion effects were observed, attributed to copper toxicity as a result of Cu 2? ions release from the membrane surface. Release of copper ions in the permeate water was determined, and the maximum value observed was considered negligible according to the World Health Organization. The desalination performance of modified membrane showed an important salt rejection with stable water flux. In conclusion, a novel chemical method for the incorporation of Cu-mPD oligomer complex into the polyamide layer of TFC-RO membranes to improve their antibiofouling properties and desalination performance was achieved.

Journal of Alloys and Compounds, 2020

Abstract Discovery of novel multifunctional photoluminescence materials are of great concern to t... more Abstract Discovery of novel multifunctional photoluminescence materials are of great concern to the development of disciplinary crossing and integration. In this study, BaTiO3@ZnO multifunctional heterostructures and BaTiO3@ZnO:Eu were prepared via the combined sol-gel-hydrothermal methods. The structure, nanoparticle morphology, and optical properties of the heterostructure are discussed. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), XPS, and Raman and photoluminescence spectra were used to characterize and monitor the heterostructure formation process. The results demonstrate that the Eu3+ ions were successfully incorporated into the ZnO matrix to form heterostructure BaTiO3@ZnO:Eu. Moreover, the optical and photoluminescence properties were investigated. The X-ray diffraction pattern shows that the BaTiO3@ZnO:Eu heterostructure is consistent with the relative intensities and positions of the peaks in the XRD, SAED and TEM spectra of BaTiO3 (BT) and ZnO:Eu, which are of rod-like shape. The intrinsic deep defect emission of ZnO and the transition emissions of both 5D0→7F1 at 593 nm and 5D0→7F2 at 616 nm, which are related to Eu3+, have been observed under excitation at 394 nm. The decrease in bandgap in response to increased doping and the addition of ZnO to BT can be attributed to the creation of sub-bands within the ZnO band range, thereby resulting in the continuous band effect and, consequently, band narrowing, which can provide guidance for the potential application for use in optical devices.

Journal of Nanomaterials, 2013

Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at diff... more Ceria nanoparticles were synthesized employing chitosan as template and thermal treatment at different temperatures (350, 650, and 960°C). The effect of calcination temperature on structural properties and photocatalytic activity of ceria nanopowder was also tested. Degradation of an azo dye, Congo Red (CR) as a model aqueous pollutant, was investigated by means of photocatalysis of ceria nanoparticles under visible light irradiation. The influence of catalyst amount, initial CR concentrations, and degradation reaction kinetics were studied. The results were compared with commercial CeO2 at the same degradation conditions.

Modern Environmental Science and Engineering

The use of reverse osmosis membranes (RO) is the most used technology for water desalination; how... more The use of reverse osmosis membranes (RO) is the most used technology for water desalination; however, membrane biofouling is considered a critical issue affecting desalination plants. The incorporation of nanoparticles with antimicrobial properties into RO membranes has been reported as an effective route for enhancing the antibiofouling properties but could diminish the performance of desalination. The aim of this work was to study the performance of antibiofouling of thin film composite (TFC-RO) membrane by incorporating antimicrobial copper-oxide (CuO) nanoparticles. These nanoparticles were incorporated within the structure of the membrane during the interfacial polymerization process. The membranes were characterized by scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscope (EDX) and atomic force microscopy (AFM) in order to observe the morphology and verify the incorporation of nanoparticles within them. Bactericidal tests were performed using Escherichia coli. Anti-adhesion on the membranes was confirmed using epifluorescence microscopy. Membranes performance were evaluated in terms of permeate flux and salt rejection by using a cross flow test cell. FESEM and EDX analyses confirmed the incorporationof nanoparticles into the membrane. These membranes showed significant anti-bacterial and excellent anti-adhesion effect attributed to the copper toxicity. Desalination performance of modified membranes showed an important salt rejection of about 98% with stable water flux about 36 L.m −2 .h −1 and a recovery of 50%. Measure copper concentrations in the permeate water shows to be negligible, indicating that the copper is not leached. In conclusion, the incorporation of CuO nanoparticles into TFC-RO membranes improves the antibiofouling capacities without impairing the performance of the membrane.

Abstract: Carbon materials were obtained by pyrolysis of the sawdust of Algarroba wood under CO2 ... more Abstract: Carbon materials were obtained by pyrolysis of the sawdust of Algarroba wood under CO2 or N2 atmospheres at temperatures from 200ºC up to 900ºC. Carbon materials were characterized by surface and micropore areas, volume pore and mean pore diameter. An approach of the kinetic parameters (apparent constant-rates and activation energies) as-sociated with the synthesis of these carbon materials is also presented. From the kinetic data of thermal degradation of Al-garroba wood, three different pyrolysis zones were verified. First, an incipient carbonization between 200 up to 350ºC, second an extensive carbonization between 350 up to 600ºC, and a third step involving the pore formation at temperatures higher than 600ºC. As a target application of carbon materials, results of phenol adsorption and phenol photodegradation under UV-irradiation indicated the potential of carbon materials in presence of TiO2 for treatment of polluted waters.

Journal of Environmental Chemical Engineering