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Article ; Online: Polypyrrole/stearic acid-coated Luffa cylindrica for enhanced removal of sodium diclofenac from water: Batch and continuous adsorption studies

da Costa, Juliê S. / Fajardo, André R.

Journal of Cleaner Production. 2023 Feb., v. 389 p.136084-

2023

Abstract: Vegetal biomasses are prominent adsorbents; however, their hydrophilicity is a limitation in removing some emerging contaminants from water. As an approach to overcome this, in this study, Luffa cylindrica (LF), a 3D natural fiber array biomass, was ... ...

Abstract	Vegetal biomasses are prominent adsorbents; however, their hydrophilicity is a limitation in removing some emerging contaminants from water. As an approach to overcome this, in this study, Luffa cylindrica (LF), a 3D natural fiber array biomass, was coated with polypyrrole/stearic acid (PPy/SAc) (LF-PPySAc) to increase its adsorption capacity towards sodium diclofenac (DCF). Characterization analyses demonstrated that the physicochemical, morphological, and wettability properties of LF changed due to the PPy/SAc coating. As a result, LF-PPySAc becomes hydrophobic (water contact angle >124°) benefiting the interaction with DCF. Experimentally, it was verified that the PPy/SAc coating enhances the adsorption of DCF by 234% (batch process) and 80% (continuous process) compared to raw LF. Kinetic, isothermal, and thermodynamics analyses indicated that the DCF adsorption is mediated mainly by physical forces (H-bonding, π-π interaction, and hydrophobic forces), and intraparticle diffusional processes are involved. The high stability of LF-PPySAc allowed its reuse at least five times without losing adsorption performance in both batch and continuous processes. Thus, the coating of LF with PPy/SAc is ranked as a promising approach to obtaining an adsorbent material with an enhanced capacity to remove hydrophobic contaminants from the aqueous medium.
Keywords	Luffa aegyptiaca ; adsorbents ; adsorption ; batch systems ; biomass ; contact angle ; diclofenac ; hydrogen bonding ; hydrophilicity ; hydrophobicity ; pyrroles ; stearic acid ; thermodynamics ; wettability ; Sponge gourd ; Emerging contaminants ; Pharmaceuticals ; Water treatment
Language	English
Dates of publication	2023-02
Publishing place	Elsevier Ltd
Document type	Article ; Online
ISSN	0959-6526
DOI	10.1016/j.jclepro.2023.136084
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Article ; Online: Removal of pharmaceuticals from aqueous medium by alginate/polypyrrole/ZnFe

Silva, Emilly C / Soares, Victória R / Fajardo, André R

Chemosphere

2023 Volume 316, Page(s) 137734

Abstract: The physicochemical and structural characteristics of the magnetic materials can be modulable due to exposition to a magnetic field, which allows, for example, to enhance its adsorption performance. In this sense, this study describes the preparation of ... ...

Abstract	The physicochemical and structural characteristics of the magnetic materials can be modulable due to exposition to a magnetic field, which allows, for example, to enhance its adsorption performance. In this sense, this study describes the preparation of magnetic beads of alginate/polypyrrole/ZnFe
MeSH term(s)	Polymers ; Pyrroles ; Adsorption ; Alginates/chemistry ; Kinetics ; Water/chemistry ; Magnetic Fields ; Pharmaceutical Preparations ; Water Pollutants, Chemical/chemistry ; Hydrogen-Ion Concentration
Chemical Substances	polypyrrole (30604-81-0) ; Polymers ; Pyrroles ; Alginates ; Water (059QF0KO0R) ; Pharmaceutical Preparations ; Water Pollutants, Chemical
Language	English
Publishing date	2023-01-03
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2022.137734
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Article ; Online: Development of superabsorbent hydrogel based on Gum Arabic for enhanced removal of anxiolytic drug from water.

Mota, Henrique P / Fajardo, André R

Journal of environmental management

2021 Volume 288, Page(s) 112455

Abstract: The growing consumption of anxiolytic drugs like diazepam (DZP) has aggravated the problem of persistent organic pollutants in water. Due to its characteristics, the removal of DZP from water and wastewater is a challenging task. As an effort to deals ... ...

Abstract	The growing consumption of anxiolytic drugs like diazepam (DZP) has aggravated the problem of persistent organic pollutants in water. Due to its characteristics, the removal of DZP from water and wastewater is a challenging task. As an effort to deals with this issue, in this study, we report the development of a hydrogel based on Gum Arabic (GA) grafted with poly(acrylic acid) (GA-g-PAAc) to be used in the adsorptive removal of DZP from water. The hydrogel formation was confirmed by Fourier-transform infrared (FTIR) spectroscopy and thermal analysis (TGA/DTG) analyses. Images obtained by scanning electron microscopy (SEM) revealed that GA-g-PAAc hydrogel exhibits a porous morphology while swelling experiments suggest a superabsorbent characteristic (degree of swelling> 600%). From batch experiments, it was found that the removal of DZP reached remarkable percentages (>80%) before 300 min in moderate experimental conditions (pH 7, 25 °C, 150 mg of adsorbent). The adsorption of DZP on GA-g-PAAc followed the pseudo-first order kinetics, and the mechanism was described by the linear Langmuir isotherm. The maximum adsorption capacity (q
MeSH term(s)	Adsorption ; Anti-Anxiety Agents ; Gum Arabic ; Hydrogels ; Hydrogen-Ion Concentration ; Kinetics ; Spectroscopy, Fourier Transform Infrared ; Water ; Water Pollutants, Chemical ; Water Purification
Chemical Substances	Anti-Anxiety Agents ; Hydrogels ; Water Pollutants, Chemical ; Water (059QF0KO0R) ; Gum Arabic (9000-01-5)
Language	English
Publishing date	2021-03-27
Publishing country	England
Document type	Journal Article
ZDB-ID	184882-3
ISSN	1095-8630 ; 0301-4797
ISSN (online)	1095-8630
ISSN	0301-4797
DOI	10.1016/j.jenvman.2021.112455
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Article ; Online: Advances in porphyrins and chlorins associated with polysaccharides and polysaccharides-based materials for biomedical and pharmaceutical applications.

Quadrado, Rafael F N / Silvestri, Siara / de Souza, Jaqueline F / Iglesias, Bernardo A / Fajardo, André R

Carbohydrate polymers

2024 Volume 334, Page(s) 122017

Abstract: Over the last decade, the convergence of advanced materials and innovative applications has fostered notable scientific progress within the biomedical and pharmaceutical fields. Porphyrins and their derivatives, distinguished by an extended conjugated π- ... ...

Abstract	Over the last decade, the convergence of advanced materials and innovative applications has fostered notable scientific progress within the biomedical and pharmaceutical fields. Porphyrins and their derivatives, distinguished by an extended conjugated π-electron system, have a relevant role in propelling these advancements, especially in drug delivery systems, photodynamic therapy, wound healing, and (bio)sensing. However, despite their promise, the practical clinical application of these macrocycles is hindered by their inherent challenges of low solubility and instability under physiological conditions. To address this limitation, researchers have exploited the synergistic association of porphyrins and chlorins with polysaccharides by engineering conjugated systems and composite/hybrid materials. This review compiles the principal advances in this growing research field, elucidating fundamental principles and critically examining the applications of such materials within biomedical and pharmaceutical contexts. Additionally, the review addresses the eventual challenges and outlines future perspectives for this poignant research field. It is expected that this review will serve as a comprehensive guide for students and researchers dedicated to exploring state-of-the-art materials for contemporary medicine and pharmaceutical applications.
MeSH term(s)	Humans ; Pharmaceutical Preparations ; Polysaccharides ; Porphyrins ; Drug Delivery Systems ; Biocompatible Materials
Chemical Substances	chlorin (2683-84-3) ; Pharmaceutical Preparations ; Polysaccharides ; Porphyrins ; Biocompatible Materials
Language	English
Publishing date	2024-03-06
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	1501516-6
ISSN	1879-1344 ; 0144-8617
ISSN (online)	1879-1344
ISSN	0144-8617
DOI	10.1016/j.carbpol.2024.122017
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Article: Supported porphyrins for the photocatalytic degradation of organic contaminants in water: a review

Silvestri, Siara / Fajardo, André R. / Iglesias, Bernardo A.

Environmental chemistry letters. 2022 Feb., v. 20, no. 1

2022

Abstract: Porphyrins are differentiated π-conjugated compounds with unique photochemical and redox properties. The tetrapyrrole macrocycle core of porphyrins is extremely favorable for the complexation of metal ions, resulting in hybrid metal–organic molecules ... ...

Abstract	Porphyrins are differentiated π-conjugated compounds with unique photochemical and redox properties. The tetrapyrrole macrocycle core of porphyrins is extremely favorable for the complexation of metal ions, resulting in hybrid metal–organic molecules with good photocatalytic properties. Over the years, porphyrins have been extensively tested as photocatalysts in advanced oxidative processes for the degradation of various organic contaminants in water. Recently, the use of porphyrins supported on solid materials is viewed as one of the most effective strategies to obtain photocatalytic systems with superior properties and applicability. Supported porphyrins can form highly organized hybrid materials, with high electron conductivity and great photoreaction properties. Here we review concepts, development, and application of supported porphyrins/metalloporphyrins. The first sections present an overview of the water contamination problem, the fundamentals of the photocatalytic treatment of water, and the main properties of porphyrins. The following sections focus on the application of supported porphyrins in the photodegradation of common organic contaminants in water. The last two sections discuss the main mechanisms and limitations.
Keywords	metalloporphyrins ; photocatalysis ; photocatalysts ; photolysis ; water pollution
Language	English
Dates of publication	2022-02
Size	p. 731-771.
Publishing place	Springer International Publishing
Document type	Article
Note	Review
ZDB-ID	2107984-5
ISSN	1610-3661 ; 1610-3653
ISSN (online)	1610-3661
ISSN	1610-3653
DOI	10.1007/s10311-021-01344-2
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Article ; Online: Composite hydrogel based on alginate-g-poly(acrylamide)/carbon nanotubes for solid phase extraction of metals from corn cereal samples.

Silva, Emilly C / Gomes, Charlie G / Vieira, Mariana A / Fajardo, André R

International journal of biological macromolecules

2023 Volume 242, Issue Pt 1, Page(s) 124586

Abstract: Composite hydrogels containing nanofillers are extensively applied in the sorption of different compounds from aqueous solutions; however, this ability is poorly exploited in the extraction and pre-concentration of analytes from complex matrices. As a ... ...

Abstract	Composite hydrogels containing nanofillers are extensively applied in the sorption of different compounds from aqueous solutions; however, this ability is poorly exploited in the extraction and pre-concentration of analytes from complex matrices. As a contribution to this field, this study reports the synthesis of a composite hydrogel of alginate-g-poly(acrylamide) matrix filled with functionalized multi-walled carbon nanotubes (ALG-g-PAAM/MWCNT-f). This composite served as a solid-phase extractor (SPE) for the separation of Pb
MeSH term(s)	Hydrogels ; Nanotubes, Carbon ; Zea mays ; Edible Grain ; Cadmium ; Alginates ; Lead ; Kinetics ; Solid Phase Extraction/methods ; Adsorption
Chemical Substances	Hydrogels ; Nanotubes, Carbon ; polyacrylamide (9003-05-8) ; Cadmium (00BH33GNGH) ; Alginates ; Lead (2P299V784P)
Language	English
Publishing date	2023-04-25
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	282732-3
ISSN	1879-0003 ; 0141-8130
ISSN (online)	1879-0003
ISSN	0141-8130
DOI	10.1016/j.ijbiomac.2023.124586
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Article: Hydrogen generation and hydrogenation reactions efficiently mediated by a thin film of reduced graphene oxide-grafted with carboxymethyl chitosan and Ag nanoparticles

Quadrado, Rafael F.N / Fajardo, André R

Journal of colloid and interface science. 2021 Feb. 01, v. 583

2021

Abstract: In this work, we have investigated the use of a heterogeneous catalyst based on reduced graphene oxide-grafted with carboxymethyl chitosan (rGO-CMCHT) and silver nanoparticles (AgNPs) for hydrogen generation through straightforward borohydride ... ...

Abstract	In this work, we have investigated the use of a heterogeneous catalyst based on reduced graphene oxide-grafted with carboxymethyl chitosan (rGO-CMCHT) and silver nanoparticles (AgNPs) for hydrogen generation through straightforward borohydride decomposition reaction. Thus, an rGO-CMCHT thin film containing AgNPs was successfully prepared by using a dip-coating technique. Characterization analysis indicated that rGO-CMCHT enhances the catalytic activity of AgNPs due to its intrinsic electric capacity (i.e., low electron-mobility resistivity). The experimental results showed that the prepared thin film has a remarkable catalytic activity that boosts hydrogen generation (maximum rate 180 × 10² mL min⁻¹ g⁻¹), achieving TOF values (480 min⁻¹) that exceed the previously reported data. High TOF values were also obtained in aqueous and non-aqueous media using low amounts of catalyst, confirming its versatility. Reuse experiments demonstrated that thin film could be recycled and reused for at least ten consecutive reactions without losing catalytic efficiency. Spectroscopic analyses showed that AgNPs were not leached in the reaction medium after the reuse cycles, indicating that rGO-CMCHT stabilizes the nanoparticles efficiently. Finally, the prepared thin film also showed excellent catalytic performance catalytic towards the reduction of nitroaromatic compounds in aqueous and non-aqueous media, confirming its versatility for hydrogen production and hydrogenation reactions.
Keywords	borohydrides ; catalysts ; catalytic activity ; chitosan ; films (materials) ; graphene ; hydrogen production ; hydrogenation ; nanosilver ; spectroscopy
Language	English
Dates of publication	2021-0201
Size	p. 626-641.
Publishing place	Elsevier Inc.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2020.09.033
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Article ; Online: Cannabidiol-loaded microparticles embedded in a porous hydrogel matrix for biomedical applications.

David, Carla / de Souza, Jaqueline F / Silva, Adriana F / Grazioli, Guillermo / Barboza, Andressa S / Lund, Rafael G / Fajardo, André R / Moraes, Rafael R

Journal of materials science. Materials in medicine

2024 Volume 35, Issue 1, Page(s) 14

Abstract: In this study, poly (lactic-co-glycolic acid) (PLGA) microparticles loaded with cannabidiol (CBD) were synthesized (PLGA@CBD microparticles) and embedded up to 10 wt% in a chondroitin sulfate/polyvinyl alcohol hydrogel matrix. In vitro chemical, physical, ...

Abstract	In this study, poly (lactic-co-glycolic acid) (PLGA) microparticles loaded with cannabidiol (CBD) were synthesized (PLGA@CBD microparticles) and embedded up to 10 wt% in a chondroitin sulfate/polyvinyl alcohol hydrogel matrix. In vitro chemical, physical, and biological assays were carried out to validate the potential use of the modified hydrogels as biomaterials. The microparticles had spherical morphology and a narrow range of size distribution. CBD encapsulation efficiency was around 52%, loading was approximately 50%. Microparticle addition to the hydrogels caused minor changes in their morphology, FTIR and thermal analyses confirmed these changes. Swelling degree and total porosity were reduced in the presence of microparticles, but similar hydrophilic and degradation in phosphate buffer solution behaviors were observed by all hydrogels. Rupture force and maximum strain at rupture were higher in the modified hydrogels, whereas modulus of elasticity was similar across all materials. Viability of primary human dental pulp cells up to 21 days was generally not influenced by the addition of PLGA@CBD microparticles. The control hydrogel showed no antimicrobial activity against Staphylococcus aureus, whereas hydrogels with 5% and 10% PLGA@CBD microparticles showed inhibition zones. In conclusion, the PLGA@CBD microparticles were fabricated and successfully embedded in a hydrogel matrix. Despite the hydrophobic nature of CBD, the physicochemical and morphological properties were generally similar for the hydrogels with and without the CBD-loaded microparticles. The data reported in this study suggested that this original biomaterial loaded with CBD oil has characteristics that could enable it to be used as a scaffold for tissue/cellular regeneration.
MeSH term(s)	Humans ; Cannabidiol ; Porosity ; Biocompatible Materials ; Biological Assay ; Hydrogels
Chemical Substances	Cannabidiol (19GBJ60SN5) ; Biocompatible Materials ; Hydrogels
Language	English
Publishing date	2024-02-14
Publishing country	United States
Document type	Journal Article
ZDB-ID	1031752-1
ISSN	1573-4838 ; 0957-4530
ISSN (online)	1573-4838
ISSN	0957-4530
DOI	10.1007/s10856-023-06773-9
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Article ; Online: Fluorescent composite beads: An advanced tool for environmental monitoring and harmful pollutants removal from water.

Soares, Victória R / Silva, Emilly C / Gomes, Charlie G / Vieira, Mariana A / Fajardo, André R

Chemosphere

2023 Volume 350, Page(s) 140911

Abstract: The quality and safety of water sources have been significantly impacted by various pollutants, including trace elements. To address this concern, this study utilized composite beads made of alginate and carbon quantum dots (CDs) for detecting and ... ...

Abstract	The quality and safety of water sources have been significantly impacted by various pollutants, including trace elements. To address this concern, this study utilized composite beads made of alginate and carbon quantum dots (CDs) for detecting and removing As(III) and Se(IV) ions in tap water. Fluorescent CDs were hydrothermally synthesized and incorporated into an alginate-Ca
MeSH term(s)	Water/analysis ; Coloring Agents/analysis ; Metals/analysis ; Alginates ; Environmental Monitoring ; Water Pollutants, Chemical/analysis ; Adsorption ; Kinetics ; Hydrogen-Ion Concentration
Chemical Substances	Water (059QF0KO0R) ; Coloring Agents ; Metals ; Alginates ; Water Pollutants, Chemical
Language	English
Publishing date	2023-12-23
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2023.140911
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Article ; Online: Synthesis and characterization of fluorescent poly(α-cyclodextrin)/carbon quantum dots composite for efficient removal and detection of toluene and xylene from aqueous media.

Silva, Emilly C / Pina, João / Pereira, Rui F P / Murtinho, Dina / Valente, Artur J M / Fajardo, André R

Environmental pollution (Barking, Essex : 1987)

2024 Volume 347, Page(s) 123778

Abstract: This study reports the synthesis and characterization of a supramolecular composite comprised of carbon dots (CDots) embedded within net-poly[(α-cyclodextrin)-ν-(citric acid)] (α-CD/CA/CDots) for the removal and detection of toluene and xylene from ... ...

Abstract	This study reports the synthesis and characterization of a supramolecular composite comprised of carbon dots (CDots) embedded within net-poly[(α-cyclodextrin)-ν-(citric acid)] (α-CD/CA/CDots) for the removal and detection of toluene and xylene from aqueous media. The remarkable stability of CDots within the composite enables the preservation of photoluminescence properties for prolonged storage and extended UV-light irradiation. As demonstrated, following the adsorption of both organic compounds, the composite detected them in the aqueous medium due to a fluorescence quenching mechanism. Spectroscopic analyses reveal that the accessible Stern-Volmer quenching constants for toluene and xylene are K
MeSH term(s)	Toluene ; Xylenes/chemistry ; Carbon/chemistry ; Quantum Dots ; alpha-Cyclodextrins ; Water ; Coloring Agents
Chemical Substances	Toluene (3FPU23BG52) ; Xylenes ; Carbon (7440-44-0) ; alpha-Cyclodextrins ; Water (059QF0KO0R) ; Coloring Agents
Language	English
Publishing date	2024-03-16
Publishing country	England
Document type	Journal Article
ZDB-ID	280652-6
ISSN	1873-6424 ; 0013-9327 ; 0269-7491
ISSN (online)	1873-6424
ISSN	0013-9327 ; 0269-7491
DOI	10.1016/j.envpol.2024.123778
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