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Different cyclodextrin-calixarene nanosponges (CyCaNSs) have been characterized by means of FFC-NMR relaxometry, and used as sorbents to remove Pb2+ ions from aqueous solutions. Considering that the removal treatments may involve polluted waters with different characteristics, the adsorption experiments were performed on solutions without and with the addition of background salts, under different operational conditions. The adsorption abilities and affinities of the nanosponges towards Pb2+ ions were investigated by measuring the metal ion concentration by means of Inductively Coupled Plasma Emission Spectroscopy (ICP-OES) and Differential Pulse Anodic Stripping Voltammetry (DP-ASV). The acid-base properties of nanosponges and of metal ion as well as their interactions with the other interacting components of the systems have been considered in the evaluation of adsorption mechanism. Recycling and reuse experiments on the most efficient adsorbents were also performed. On the grounds of the results obtained, post-modified CyCaNSs appear promising materials for designing environmental remediation devices.
Salvatore Cataldo; Paolo Lo Meo; Pellegrino Conte; Antonella Di Vincenzo; Demetrio Milea; Alberto Pettignano. Evaluation of adsorption ability of cyclodextrin-calixarene nanosponges towards Pb2+ ion in aqueous solution. Carbohydrate Polymers 2021, 267, 118151 .
AMA StyleSalvatore Cataldo, Paolo Lo Meo, Pellegrino Conte, Antonella Di Vincenzo, Demetrio Milea, Alberto Pettignano. Evaluation of adsorption ability of cyclodextrin-calixarene nanosponges towards Pb2+ ion in aqueous solution. Carbohydrate Polymers. 2021; 267 ():118151.
Chicago/Turabian StyleSalvatore Cataldo; Paolo Lo Meo; Pellegrino Conte; Antonella Di Vincenzo; Demetrio Milea; Alberto Pettignano. 2021. "Evaluation of adsorption ability of cyclodextrin-calixarene nanosponges towards Pb2+ ion in aqueous solution." Carbohydrate Polymers 267, no. : 118151.
Water is essential for humans, animals, and plants; pollutants, usually derived from anthropogenic activities, can have a serious effect on its quality. Heavy metals are significant pollutants and are often highly toxic to living organisms, even at very low concentrations. Among the numerous removal techniques proposed, adsorption onto suitable adsorbent materials is considered to be one of the most promising. The objective of the current study was to determine the effectiveness of halloysite nanotubes (HNT) functionalized with organic amino or thiol groups as adsorbent materials to decontaminate polluted waters, using the removal of Hg2+ ions, one of the most dangerous heavy metals, as the test case. The effects of pH, ionic strength (I), and temperature of the metal ion solution on the adsorption ability and affinity of both materials were evaluated. To this end, adsorption experiments were carried out with no ionic medium and in NaNO3 and NaCl at I = 0.1 mol L−1, in the pH range 3–5 and in the temperature range 283.15–313.15 K. Kinetic and thermodynamic aspects of adsorption were considered by measuring the metal ion concentrations in aqueous solution. Various equations were used to fit experimental data, and the results obtained were explained on the basis of both the adsorbent’s characterization and the Hg2+ speciation under the given experimental conditions. Thiol and amino groups enhanced the adsorption capability of halloysite for Hg2+ ions in the pH range 3–5. The pH, the ionic medium, and the ionic strength of aqueous solution all play an important role in the adsorption process. A physical adsorption mechanism enhanced by ion exchange is proposed for both functionalized materials.
Salvatore Cataldo; Francesco Crea; Marina Massaro; Demetrio Milea; Alberto Pettignano; Serena Riela. FUNCTIONALIZED HALLOYSITE NANOTUBES FOR ENHANCED REMOVAL OF Hg2+ IONS FROM AQUEOUS SOLUTIONS. Clays and Clay Minerals 2021, 1 -11.
AMA StyleSalvatore Cataldo, Francesco Crea, Marina Massaro, Demetrio Milea, Alberto Pettignano, Serena Riela. FUNCTIONALIZED HALLOYSITE NANOTUBES FOR ENHANCED REMOVAL OF Hg2+ IONS FROM AQUEOUS SOLUTIONS. Clays and Clay Minerals. 2021; ():1-11.
Chicago/Turabian StyleSalvatore Cataldo; Francesco Crea; Marina Massaro; Demetrio Milea; Alberto Pettignano; Serena Riela. 2021. "FUNCTIONALIZED HALLOYSITE NANOTUBES FOR ENHANCED REMOVAL OF Hg2+ IONS FROM AQUEOUS SOLUTIONS." Clays and Clay Minerals , no. : 1-11.
8-hydroxyquinoline-2-carboxylic acid (8-HQA) has been found in high concentrations (0.5–5.0 mmol·dm−3) in the gut of Noctuid larvae (and in a few other lepidopterans), in which it is proposed to act as a siderophore. Since it is known that many natural siderophores are also involved in the uptake and metabolism of other essential elements than iron, this study reports some results on the investigation of 8-HQA interactions with molybdate (MoO42−, i.e., the main molybdenum form in aqueous environments), in order to understand the possible role of this ligand as molybdophore. A multi-technique approach has been adopted, in order to derive a comprehensive set of information necessary to assess the chemical speciation of the 8-HQA/MoO42− system, as well as the coordination behavior and the sequestering ability of 8-HQA towards molybdate. Chemical speciation studies have been performed in KCl(aq) at I = 0.2 mol·dm−3 and T = 298.15 K by ISE-H+ (glass electrode) potentiometric and UV/Vis spectrophotometric titrations. CV (Cyclic Voltammetry), DP-ASV (Differential Pulse-Anodic Stripping Voltammetry), ESI-MS experiments and quantum mechanical calculations have been also performed to derive information about the nature and possible structure of species formed. These results are also compared with those reported for the 8-HQA/Fe3+ system in terms of chemical speciation and sequestering ability of 8-HQA.
Katia Arena; Giuseppe Brancato; Francesco Cacciola; Francesco Crea; Salvatore Cataldo; Concetta De Stefano; Sofia Gama; Gabriele Lando; Demetrio Milea; Luigi Mondello; Alberto Pettignano; Winfried Plass; Silvio Sammartano. 8-Hydroxyquinoline-2-Carboxylic Acid as Possible Molybdophore: A Multi-Technique Approach to Define Its Chemical Speciation, Coordination and Sequestering Ability in Aqueous Solution. Biomolecules 2020, 10, 930 .
AMA StyleKatia Arena, Giuseppe Brancato, Francesco Cacciola, Francesco Crea, Salvatore Cataldo, Concetta De Stefano, Sofia Gama, Gabriele Lando, Demetrio Milea, Luigi Mondello, Alberto Pettignano, Winfried Plass, Silvio Sammartano. 8-Hydroxyquinoline-2-Carboxylic Acid as Possible Molybdophore: A Multi-Technique Approach to Define Its Chemical Speciation, Coordination and Sequestering Ability in Aqueous Solution. Biomolecules. 2020; 10 (6):930.
Chicago/Turabian StyleKatia Arena; Giuseppe Brancato; Francesco Cacciola; Francesco Crea; Salvatore Cataldo; Concetta De Stefano; Sofia Gama; Gabriele Lando; Demetrio Milea; Luigi Mondello; Alberto Pettignano; Winfried Plass; Silvio Sammartano. 2020. "8-Hydroxyquinoline-2-Carboxylic Acid as Possible Molybdophore: A Multi-Technique Approach to Define Its Chemical Speciation, Coordination and Sequestering Ability in Aqueous Solution." Biomolecules 10, no. 6: 930.
The acid–base properties of two bifunctional 3-hydroxy-4-pyridinone ligands and their chelating capacity towards Zn2+, an essential bio-metal cation, were investigated in NaCl aqueous solutions by potentiometric, UV-Vis spectrophotometric, and 1H NMR spectroscopic titrations, carried out at 0.15 ≤ I/mol −1 ≤ 1.00 and 288.15 ≤ T/K ≤ 310.15. A study at I = 0.15 mol L−1 and T = 298.15 K was also performed for other three Zn2+/Lz− systems, with ligands belonging to the same family of compounds. The processing of experimental data allowed the determination of protonation and stability constants, which showed accordance with the data obtained from the different analytical techniques used, and with those reported in the literature for the same class of compounds. ESI-MS spectrometric measurements provided support for the formation of the different Zn2+/ligand species, while computational molecular simulations allowed information to be gained on the metal–ligand coordination. The dependence on ionic strength and the temperature of equilibrium constants were investigated by means of the extended Debye–Hückel model, the classical specific ion interaction theory, and the van’t Hoff equations, respectively.
Anna Irto; Paola Cardiano; Salvatore Cataldo; Karam Chand; Rosalia Maria Cigala; Francesco Crea; Concetta De Stefano; Giuseppe Gattuso; Nicola Muratore; Alberto Pettignano; Silvio Sammartano; M. Amélia Santos. Speciation Studies of Bifunctional 3-Hydroxy-4-Pyridinone Ligands in the Presence of Zn2+ at Different Ionic Strengths and Temperatures. Molecules 2019, 24, 4084 .
AMA StyleAnna Irto, Paola Cardiano, Salvatore Cataldo, Karam Chand, Rosalia Maria Cigala, Francesco Crea, Concetta De Stefano, Giuseppe Gattuso, Nicola Muratore, Alberto Pettignano, Silvio Sammartano, M. Amélia Santos. Speciation Studies of Bifunctional 3-Hydroxy-4-Pyridinone Ligands in the Presence of Zn2+ at Different Ionic Strengths and Temperatures. Molecules. 2019; 24 (22):4084.
Chicago/Turabian StyleAnna Irto; Paola Cardiano; Salvatore Cataldo; Karam Chand; Rosalia Maria Cigala; Francesco Crea; Concetta De Stefano; Giuseppe Gattuso; Nicola Muratore; Alberto Pettignano; Silvio Sammartano; M. Amélia Santos. 2019. "Speciation Studies of Bifunctional 3-Hydroxy-4-Pyridinone Ligands in the Presence of Zn2+ at Different Ionic Strengths and Temperatures." Molecules 24, no. 22: 4084.
The pH‐responsive properties of cyclodextrin‐calixarene nanosponge co‐polymeric materials have been investigated. In particular, ISE‐H+ potentiometric titrations were carried out in order to evaluate the acid‐base properties and the actual amount of ionizable sites present in the materials. Moreover, the relevant pH‐dependent adsorption abilities were evaluated towards a set of selected model organic pollutant molecules by means of adsorption tests and by studying the corresponding adsorption isotherms. The latter ones could be suitably described by means of the Freundlich model. The whole of the experimental results enabled us to clarify some general aspects of the microscopic behavior of the nanosponges considered.
Antonella Di Vincenzo; Marco Russo; Salvatore Cataldo; Demetrio Milea; Alberto Pettignano; Paolo Lo Meo. Effect of pH Variations on the Properties of Cyclodextrin‐Calixarene Nanosponges. ChemistrySelect 2019, 4, 6155 -6161.
AMA StyleAntonella Di Vincenzo, Marco Russo, Salvatore Cataldo, Demetrio Milea, Alberto Pettignano, Paolo Lo Meo. Effect of pH Variations on the Properties of Cyclodextrin‐Calixarene Nanosponges. ChemistrySelect. 2019; 4 (20):6155-6161.
Chicago/Turabian StyleAntonella Di Vincenzo; Marco Russo; Salvatore Cataldo; Demetrio Milea; Alberto Pettignano; Paolo Lo Meo. 2019. "Effect of pH Variations on the Properties of Cyclodextrin‐Calixarene Nanosponges." ChemistrySelect 4, no. 20: 6155-6161.
An activated biochar coming from pyrolysis of dead Posidonia oceanica residues has been tested as adsorbent material for Cd2+, Pb2+ and Cu2+ ions. The biomass, the activated and the non activated biochars were previously characterized by using several instrumental techniques. The pH of metal ion solution in kinetic and thermodynamic adsorption experiments was fixed at 5 whilst, the dependence on ionic medium, ionic strength and temperature have been evaluated carrying out batch experiments at different experimental conditions. Differential Pulse Anodic Stripping Voltammetry and Inductively Coupled Plasma Optical Emission Spectroscopy have been used to measure the metal ion concentration in the solutions. Several kinetic and isotherm equations were used to fit experimental data. The thermodynamic parameters ΔG, ΔH and ΔS of Pb2+ adsorption process were calculated by using Gibbs and van't Hoff equations. A speciation study of the Pb2+ ion was also done in order to evaluate the influence of ionic medium and ionic strength on the adsorption process. Information about adsorption mechanism was obtained from the analysis of thermodynamic parameters of adsorption and of the results of metal ions speciation and biochar characterization.
Salvatore Cataldo; Vitaliano Chiodo; Francesco Crea; Susanna Maisano; Demetrio Milea; Alberto Pettignano. Biochar from byproduct to high value added material – A new adsorbent for toxic metal ions removal from aqueous solutions. Journal of Molecular Liquids 2018, 271, 481 -489.
AMA StyleSalvatore Cataldo, Vitaliano Chiodo, Francesco Crea, Susanna Maisano, Demetrio Milea, Alberto Pettignano. Biochar from byproduct to high value added material – A new adsorbent for toxic metal ions removal from aqueous solutions. Journal of Molecular Liquids. 2018; 271 ():481-489.
Chicago/Turabian StyleSalvatore Cataldo; Vitaliano Chiodo; Francesco Crea; Susanna Maisano; Demetrio Milea; Alberto Pettignano. 2018. "Biochar from byproduct to high value added material – A new adsorbent for toxic metal ions removal from aqueous solutions." Journal of Molecular Liquids 271, no. : 481-489.
Halloysite nanotubes were functionalized with bis-vinyl imidazolium salts and PdNPs to obtain an efficient catalyst for fine chemical synthesis.
Marina Massaro; Carmelo Giuseppe Colletti; Gabriella Buscemi; Salvatore Cataldo; Susanna Guernelli; Giuseppe Lazzara; Leonarda Francesca Liotta; Filippo Parisi; Alberto Pettignano; Serena Riela. Palladium nanoparticles immobilized on halloysite nanotubes covered by a multilayer network for catalytic applications. New Journal of Chemistry 2018, 42, 13938 -13947.
AMA StyleMarina Massaro, Carmelo Giuseppe Colletti, Gabriella Buscemi, Salvatore Cataldo, Susanna Guernelli, Giuseppe Lazzara, Leonarda Francesca Liotta, Filippo Parisi, Alberto Pettignano, Serena Riela. Palladium nanoparticles immobilized on halloysite nanotubes covered by a multilayer network for catalytic applications. New Journal of Chemistry. 2018; 42 (16):13938-13947.
Chicago/Turabian StyleMarina Massaro; Carmelo Giuseppe Colletti; Gabriella Buscemi; Salvatore Cataldo; Susanna Guernelli; Giuseppe Lazzara; Leonarda Francesca Liotta; Filippo Parisi; Alberto Pettignano; Serena Riela. 2018. "Palladium nanoparticles immobilized on halloysite nanotubes covered by a multilayer network for catalytic applications." New Journal of Chemistry 42, no. 16: 13938-13947.
Salvatore Cataldo; Giuseppe Lazzara; Marina Massaro; Nicola Muratore; Alberto Pettignano; Serena Riela. Functionalized halloysite nanotubes for enhanced removal of lead(II) ions from aqueous solutions. Applied Clay Science 2018, 156, 87 -95.
AMA StyleSalvatore Cataldo, Giuseppe Lazzara, Marina Massaro, Nicola Muratore, Alberto Pettignano, Serena Riela. Functionalized halloysite nanotubes for enhanced removal of lead(II) ions from aqueous solutions. Applied Clay Science. 2018; 156 ():87-95.
Chicago/Turabian StyleSalvatore Cataldo; Giuseppe Lazzara; Marina Massaro; Nicola Muratore; Alberto Pettignano; Serena Riela. 2018. "Functionalized halloysite nanotubes for enhanced removal of lead(II) ions from aqueous solutions." Applied Clay Science 156, no. : 87-95.
The leachate humic fraction is a good sequestering agent towards toxic metal ions, influencing their aqueous solution behaviour and their environmental impact.
Salvatore Cataldo; Gabriele Lando; Demetrio Milea; Santino Orecchio; Alberto Pettignano; Silvio Sammartano. A novel thermodynamic approach for the complexation study of toxic metal cations by a landfill leachate. New Journal of Chemistry 2018, 42, 7640 -7648.
AMA StyleSalvatore Cataldo, Gabriele Lando, Demetrio Milea, Santino Orecchio, Alberto Pettignano, Silvio Sammartano. A novel thermodynamic approach for the complexation study of toxic metal cations by a landfill leachate. New Journal of Chemistry. 2018; 42 (10):7640-7648.
Chicago/Turabian StyleSalvatore Cataldo; Gabriele Lando; Demetrio Milea; Santino Orecchio; Alberto Pettignano; Silvio Sammartano. 2018. "A novel thermodynamic approach for the complexation study of toxic metal cations by a landfill leachate." New Journal of Chemistry 42, no. 10: 7640-7648.
The adsorption capacity of ground hazelnut (HS) and almond (AS) shells towards Pb(II) and Cd(II) has been studied at pH = 5, in NaNO3 and NaCl ionic media, in the ionic strength range 0.05–0.5 mol L−1. Kinetic and equilibrium experiments were carried out by using the Differential Pulse Anodic Stripping Voltammetry technique to check the amount of the metal ion removed by HS and AS materials. Different kinetic and equilibrium equations were used to fit experimental data and a statistical study was done to establish the suitable model for the data fitting. A speciation study of the metal ions in solution was also done in order to evaluate the influence of the ionic medium on the adsorption process. TGA-DSC, FT-IR, and SEM-EDX techniques were used to characterize the adsorbent materials. The mechanism of metal ions adsorption was explained on the basis of the results obtained by the metal ions speciation study and the characterization of materials.
Salvatore Cataldo; Antonio Gianguzza; Demetrio Milea; Nicola Muratore; Alberto Pettignano; Silvio Sammartano. A critical approach to the toxic metal ion removal by hazelnut and almond shells. Environmental Science and Pollution Research 2017, 25, 4238 -4253.
AMA StyleSalvatore Cataldo, Antonio Gianguzza, Demetrio Milea, Nicola Muratore, Alberto Pettignano, Silvio Sammartano. A critical approach to the toxic metal ion removal by hazelnut and almond shells. Environmental Science and Pollution Research. 2017; 25 (5):4238-4253.
Chicago/Turabian StyleSalvatore Cataldo; Antonio Gianguzza; Demetrio Milea; Nicola Muratore; Alberto Pettignano; Silvio Sammartano. 2017. "A critical approach to the toxic metal ion removal by hazelnut and almond shells." Environmental Science and Pollution Research 25, no. 5: 4238-4253.
In this work, the decision-making process involved in the restoration of the eighteenth century paliotto ligneo (wooden altar frontal) della chiesa del Santissimo Crocifisso all’Albergheria of Palermo is presented. Earlier research concerning mirror restoration was based on only a few case studies and the proposed techniques were not suitable for the artwork here. As a consequence, it was necessary to re-examine theories and protocols of modern restoration to plan an appropriate intervention of the altar frontal. Since in this artwork the role of mirrors is not to give back images, as usual, but rather to create special light effects and play of lights, this work aims to find an approach to the restoration of the altar frontal and its decorations that allows a homogeneous overview of the piece. Thus, the mirrors were not substituted or re-created. Only a visual integration of the damaged ancient mirrors was proposed, with the use of metallic-polymeric films, permitting a completely reversible restoration.
Aria Amato; Elena Arizio; Salvatore Cataldo; Emilio Francesco Orsega; Nicola Muratore; Mauro Sebastianelli. Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria, Sicily (Italy). Studies in Conservation 2017, 63, 194 -200.
AMA StyleAria Amato, Elena Arizio, Salvatore Cataldo, Emilio Francesco Orsega, Nicola Muratore, Mauro Sebastianelli. Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria, Sicily (Italy). Studies in Conservation. 2017; 63 (4):194-200.
Chicago/Turabian StyleAria Amato; Elena Arizio; Salvatore Cataldo; Emilio Francesco Orsega; Nicola Muratore; Mauro Sebastianelli. 2017. "Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria, Sicily (Italy)." Studies in Conservation 63, no. 4: 194-200.
The adsorption capacity of an activated carbon – calcium alginate composite material (ACAA-Ca) has been tested with the aim of developing a new and more efficient adsorbent material to remove Pb(II) ion from aqueous solution. The study was carried out at pH = 5, in NaCl medium and in the ionic strength range 0.1–0.75 mol L−1. Differential Pulse Anodic Stripping Voltammetry (DP-ASV) technique was used to check the amount of Pb(II) ion removed during kinetic and equilibrium experiments. Different kinetic (pseudo first order, pseudo second order and Vermuelen) and equilibrium (Langmuir and Freundlich) models were used to fit experimental data, and were statistically compared. Calcium alginate (AA-Ca) improves the adsorption capacity (qm) of active carbon (AC) in the ACAA-Ca adsorbent material (e.g., qm = 15.7 and 10.5 mg g−1 at I = 0.25 mol L−1, for ACAA-Ca and AC, respectively). SEM-EDX and thermogravimetric (TGA) measurements were carried out in order to characterize the composite material. The results of the speciation study on the Pb(II) solution and of the characterization of the ACAA-Ca and of the pristine AA-Ca and AC were evaluated in order to explain the specific contribution of AC and AA-Ca to the adsorption of the metal ion.
Salvatore Cataldo; Antonio Gianguzza; Demetrio Milea; Nicola Muratore; Alberto Pettignano. Pb(II) adsorption by a novel activated carbon alginate composite material. A kinetic and equilibrium study. International Journal of Biological Macromolecules 2016, 92, 769 -778.
AMA StyleSalvatore Cataldo, Antonio Gianguzza, Demetrio Milea, Nicola Muratore, Alberto Pettignano. Pb(II) adsorption by a novel activated carbon alginate composite material. A kinetic and equilibrium study. International Journal of Biological Macromolecules. 2016; 92 ():769-778.
Chicago/Turabian StyleSalvatore Cataldo; Antonio Gianguzza; Demetrio Milea; Nicola Muratore; Alberto Pettignano. 2016. "Pb(II) adsorption by a novel activated carbon alginate composite material. A kinetic and equilibrium study." International Journal of Biological Macromolecules 92, no. : 769-778.
In the present work, an integrated process combining three different technologies, i.e. heterogeneous photocatalysis, homogeneous ozonation and adsorption on granular activated carbon (GAC) was used for the treatment of a synthetic solution simulating saline wastewater.\ud The synergistic effects between the different methods enhance the oxidation rate of the organic com- pounds in the integrated process, so that its use may result sustainable.\ud It has been found that a relatively low oxidation rate is sufficient to obtain the highest synergy between the three technologies and to maximize the performances. In particular, coupling ozonation and photo- catalysis resulted in 20% enhancement in terms of reaction rate with respect to the sum of the rates of the single technologies. The contemporary presence of GAC and photocatalytic ozonation led to further enhancement of the whole system efficiency, obtaining a reaction rate 15% higher than the sum of the rates of the above mentioned single technologies
Salvatore Cataldo; Adriano Iannì; Vittorio Loddo; Eliana Mirenda; Leonardo Palmisano; Francesco Parrino; Daniela Piazzese. Combination of advanced oxidation processes and active carbons adsorption for the treatment of simulated saline wastewater. Separation and Purification Technology 2016, 171, 101 -111.
AMA StyleSalvatore Cataldo, Adriano Iannì, Vittorio Loddo, Eliana Mirenda, Leonardo Palmisano, Francesco Parrino, Daniela Piazzese. Combination of advanced oxidation processes and active carbons adsorption for the treatment of simulated saline wastewater. Separation and Purification Technology. 2016; 171 ():101-111.
Chicago/Turabian StyleSalvatore Cataldo; Adriano Iannì; Vittorio Loddo; Eliana Mirenda; Leonardo Palmisano; Francesco Parrino; Daniela Piazzese. 2016. "Combination of advanced oxidation processes and active carbons adsorption for the treatment of simulated saline wastewater." Separation and Purification Technology 171, no. : 101-111.
A kinetic and thermodynamic study on the sorption ability of calcium alginate gel beads towards Pd(II) ion was made in aqueous solution at different pH and chloride concentrations. The experimental conditions adopted in the sorption experiments were established on the basis of a speciation study on the Pd2+-AA system in which all the side reactions, such as the hydrolysis of Pd(II), the protonation of alginate and the interactions of the ligand and the metal ion with ions of ionic medium were taken into account. In the pH range 2–5 and at chloride concentration in the range 0⩽ CCl-/mmolL−1⩽10 the gel beads showed good sorption ability towards Pd(II) ion as confirmed by kinetic and thermodynamic data calculated by a pseudo second order equation and using Langmuir and Freundlich models. The comparison between qe values related to the kinetics of Pd(II) sorption and Ca(II) release in solution by gel beads indicated that the ion exchange is one of the main sorption mechanisms of the sorbent material. Similarities were found between the trends of sequestering (% PdAA species, pL0.5) and the sorption (qe, qmax) parameters as function of pH and chloride concentration. It confirms a close relation between the behaviour of alginate as sequestering agent for Pd(II) ion in aqueous solution and of calcium alginate gel beads as sorbent material for the removal of the metal ion
Salvatore Cataldo; Antonio Gianguzza; Alberto Pettignano. Sorption of Pd(II) ion by calcium alginate gel beads at different chloride concentrations and pH. A kinetic and equilibrium study. Arabian Journal of Chemistry 2016, 9, 656 -667.
AMA StyleSalvatore Cataldo, Antonio Gianguzza, Alberto Pettignano. Sorption of Pd(II) ion by calcium alginate gel beads at different chloride concentrations and pH. A kinetic and equilibrium study. Arabian Journal of Chemistry. 2016; 9 (5):656-667.
Chicago/Turabian StyleSalvatore Cataldo; Antonio Gianguzza; Alberto Pettignano. 2016. "Sorption of Pd(II) ion by calcium alginate gel beads at different chloride concentrations and pH. A kinetic and equilibrium study." Arabian Journal of Chemistry 9, no. 5: 656-667.
Trace metal concentrations were measured in different tissues of Sabella spallanzanii, Styela plicata and Mytilus galloprovincialis collected in Termini Imerese harbor, located in Sicily (Italy), in order to evaluate the potential use of these species as bioindicators. The higher bioaccumulation factors (BAFs) were calculated in tube of Sabella spallanzanii, except for As which shows the higher BAF in branchial crown of the same specie. Regarding the other species analyzed, higher BAFs were found in the digestive gland of Mytilus galloprovincialis. An exception is represented by Pb that is significantly more concentrated in branchial basket and tunic of Styela plicata. The BAFs here calculated, show that all the species analyzed are able to accumulate a certain amount of metals as a consequence of filter feeding mechanisms, and thus assess the suitability of the species Styela plicata, Sabella spallanzanii and Mytilus galloprovincialis as indicators of water quality. Particularly, the tube of Sabella spallanzanii is an important compartment in metal retention and the more suitable for the evaluation of the contamination caused by trace elements. This article is protected by copyright. All rights reserved
Antonio Bellante; Daniela Piazzese; Salvatore Cataldo; Maria Giovanna Parisi; Matteo Cammarata. Evaluation and comparison of trace metal accumulation in different tissues of potential bioindicator organisms: Macrobenthic filter feedersStyela plicata, Sabella spallanzanii, andMytilus galloprovincialis. Environmental Toxicology and Chemistry 2016, 35, 3062 -3070.
AMA StyleAntonio Bellante, Daniela Piazzese, Salvatore Cataldo, Maria Giovanna Parisi, Matteo Cammarata. Evaluation and comparison of trace metal accumulation in different tissues of potential bioindicator organisms: Macrobenthic filter feedersStyela plicata, Sabella spallanzanii, andMytilus galloprovincialis. Environmental Toxicology and Chemistry. 2016; 35 (12):3062-3070.
Chicago/Turabian StyleAntonio Bellante; Daniela Piazzese; Salvatore Cataldo; Maria Giovanna Parisi; Matteo Cammarata. 2016. "Evaluation and comparison of trace metal accumulation in different tissues of potential bioindicator organisms: Macrobenthic filter feedersStyela plicata, Sabella spallanzanii, andMytilus galloprovincialis." Environmental Toxicology and Chemistry 35, no. 12: 3062-3070.
In this paper, new information on physical and chemical properties of the widely used nano-structured Halloysite mineral are reported. Given that the Halloysite has a tubular structure formed by a variable number of wrapped layers containing Si-OH and Al-OH groups, their proton binding affinity was measured at different ionic strengths and ionic media by means of potentiometric measurements in heterogeneous phase. One protonation constant for the Si-OH groups and two for the Al-OH groups were determined. The protonation constant values increase with increasing of the ionic strength in all the ionic media. This suggests that the presence of a background electrolyte stabilizes the protonated species, through the formation of weak complexes between ions of the supporting electrolytes and the protonated species. Ten weak species were determined with different stoichiometry. It was shown that the interactions do not depend on the nature of the supporting electrolytes, but on the charge. The surface charge of Halloysite was estimated by ζ potential measurements as a function of pH and the values obtained are consistent with the nanotubes ionization predicted by using the protonation constants for the Si-OH and Al-OH groups. The total solubility of the Halloysite nanotubes, was also determined in NaCl aqueous solution. These measurements showed that the solubility slightly increases with increasing ionic strength and contact time between Halloysite and NaCl solution. Goodness of the fit (GOF) criteria were used to test the application of these models with good results. The obtained results confirm that the behavior of Halloysite in water is strictly correlated to the experimental conditions of the aqueous suspension (e.g., pH, ionic strength and ionic media). The thermodynamic data here reported are of main importance in the several applications where is exploited the charge separation between the inner and outer surfaces of this nano-tubular material.
Clemente Bretti; Salvatore Cataldo; Antonio Gianguzza; Gabriele Lando; Giuseppe Lazzara; Alberto Pettignano; Silvio Sammartano. Thermodynamics of Proton Binding of Halloysite Nanotubes. The Journal of Physical Chemistry C 2016, 120, 7849 -7859.
AMA StyleClemente Bretti, Salvatore Cataldo, Antonio Gianguzza, Gabriele Lando, Giuseppe Lazzara, Alberto Pettignano, Silvio Sammartano. Thermodynamics of Proton Binding of Halloysite Nanotubes. The Journal of Physical Chemistry C. 2016; 120 (14):7849-7859.
Chicago/Turabian StyleClemente Bretti; Salvatore Cataldo; Antonio Gianguzza; Gabriele Lando; Giuseppe Lazzara; Alberto Pettignano; Silvio Sammartano. 2016. "Thermodynamics of Proton Binding of Halloysite Nanotubes." The Journal of Physical Chemistry C 120, no. 14: 7849-7859.
The adsorption ability of hybrid Montmorillonite and Laponite–calcium alginate gel beads towards Pd2 + ion was studied in the pH range 2–4, in pure water and in aqueous NaCl solution at I = 0.01 mol L− 1 and T = 25 °C. The pseudo second order kinetic equation and the Langmuir and Freundlich isotherms were used to fit the kinetic and thermodynamic experimental data. A comparison of the results already published on the adsorption capacity of calcium alginate gel beads at the same experimental conditions was made. Enhancement of palladium(II) adsorption by alginate beads with the addition of the two clay minerals was obtained, with increments higher than 50% of Pd(II) ion recovered/removed. The physico-chemical characterization of gel beads was also made. SEM micrographs, EDX and FT-IR spectra as well as the values of the physical parameters calculated for each adsorbent material were analysed in order to find correlations between their chemical and physical properties and their behaviour in terms of palladium adsorption.
Salvatore Cataldo; Nicola Muratore; Santino Orecchio; Alberto Pettignano. Enhancement of adsorption ability of calcium alginate gel beads towards Pd(II) ion. A kinetic and equilibrium study on hybrid Laponite and Montmorillonite–alginate gel beads. Applied Clay Science 2015, 118, 162 -170.
AMA StyleSalvatore Cataldo, Nicola Muratore, Santino Orecchio, Alberto Pettignano. Enhancement of adsorption ability of calcium alginate gel beads towards Pd(II) ion. A kinetic and equilibrium study on hybrid Laponite and Montmorillonite–alginate gel beads. Applied Clay Science. 2015; 118 ():162-170.
Chicago/Turabian StyleSalvatore Cataldo; Nicola Muratore; Santino Orecchio; Alberto Pettignano. 2015. "Enhancement of adsorption ability of calcium alginate gel beads towards Pd(II) ion. A kinetic and equilibrium study on hybrid Laponite and Montmorillonite–alginate gel beads." Applied Clay Science 118, no. : 162-170.
Systematic kinetic and equilibrium studies on the lead ions removal ability by Ca-alginate gel beads have\ud been performed by varying several internal parameters, namely, number of gel beads, nature and composition\ud of the ionic medium and pH, which allowed us to model a wastewater in order to closely reproduce the composition of a real sample. Moreover, the effects brought about the different ionic species\ud present in the reacting medium have been evaluated.\ud Differential Pulse Anodic Stripping Voltammetry (DP-ASV), has been systematically used to perform\ud kinetic and equilibrium measurements over continuous time in a wide range of concentration. Kinetic\ud and equilibrium data have been quantitatively analyzed by means of robust approach both for the\ud non-linear regression and the subsequent residuals analysis in order to significantly improve the results\ud in terms of precision and accuracy.\ud Alginate gel beads have been characterized by SEM and an investigation on their swelling behavior has also been made. Removal efficiency of the calcium-alginate gel beads has been calculated and results\ud obtained have showed a relevant dependence on ionic strength, composition of ionic media, pH of solution and number of gel beads. The number of gel beads takes part as key crucial components, i.e., the higher the number of beads the greater the amount of Pb(II) species removed from the sample, the lower the time needed to reach the maximum removal efficiency of 90%
Salvatore Cataldo; Antonio Gianguzza; Marcello Merli; Nicola Muratore; Daniela Piazzese; Maria Liria Turco Liveri. Experimental and robust modeling approach for lead(II) uptake by alginate gel beads: Influence of the ionic strength and medium composition. Journal of Colloid and Interface Science 2014, 434, 77 -88.
AMA StyleSalvatore Cataldo, Antonio Gianguzza, Marcello Merli, Nicola Muratore, Daniela Piazzese, Maria Liria Turco Liveri. Experimental and robust modeling approach for lead(II) uptake by alginate gel beads: Influence of the ionic strength and medium composition. Journal of Colloid and Interface Science. 2014; 434 ():77-88.
Chicago/Turabian StyleSalvatore Cataldo; Antonio Gianguzza; Marcello Merli; Nicola Muratore; Daniela Piazzese; Maria Liria Turco Liveri. 2014. "Experimental and robust modeling approach for lead(II) uptake by alginate gel beads: Influence of the ionic strength and medium composition." Journal of Colloid and Interface Science 434, no. : 77-88.
Kinetic and equilibrium studies have been carried out to evaluate Cd(II) and Cu(II) sorption from aqueous\ud solution by calcium alginate and new synthesized hybrid calcium alginate/pectate gel beads with\ud different alginate/pectate concentration ratios. Physical and chemical properties of the beads were\ud characterized by different techniques (SEM, EDX, TGA). The best experimental pH conditions were\ud selected on the basis of a study on the acid–base properties of pectin and alginate in aqueous solution and their ability to act as sequestering agents for copper(II) and cadmium(II) ions. Calcium released during the sorption process was determined in order to elucidate a possible ion exchange mechanism between calciumof the beads and metal ions in solution. Sorption kinetics andmetal sorption capacity of\ud gel beads were investigated in batch mode. Measurements of Cd2+, Cu2+ and Ca2+ concentration were carried out by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Results obtained showed that for all the studied systems the sorption process follows a pseudo-second order kinetic model and the sorption rate increases when increasing pectin concentration in gel beads. The\ud equilibrium data were fitted by using both Langmuir and Freundlich isotherms models. The highest copper and cadmiumsorption yields were obtained for beads containing a mixture of 2% alginate and 2% pectate. Ion exchange is the major mechanism governing the sorption process though other mechanisms are also taking place
Salvatore Cataldo; Giuseppe Cavallaro; Antonio Gianguzza; Giuseppe Lazzara; Alberto Pettignano; Daniela Piazzese; Isabel Villaescusa. Kinetic and equilibrium study for cadmium and copper removal from aqueous solutions by sorption onto mixed alginate/pectin gel beads. Journal of Environmental Chemical Engineering 2013, 1, 1252 -1260.
AMA StyleSalvatore Cataldo, Giuseppe Cavallaro, Antonio Gianguzza, Giuseppe Lazzara, Alberto Pettignano, Daniela Piazzese, Isabel Villaescusa. Kinetic and equilibrium study for cadmium and copper removal from aqueous solutions by sorption onto mixed alginate/pectin gel beads. Journal of Environmental Chemical Engineering. 2013; 1 (4):1252-1260.
Chicago/Turabian StyleSalvatore Cataldo; Giuseppe Cavallaro; Antonio Gianguzza; Giuseppe Lazzara; Alberto Pettignano; Daniela Piazzese; Isabel Villaescusa. 2013. "Kinetic and equilibrium study for cadmium and copper removal from aqueous solutions by sorption onto mixed alginate/pectin gel beads." Journal of Environmental Chemical Engineering 1, no. 4: 1252-1260.
The binding capacity of four amino-polycarboxylic ligands (APCs) [nitrilotriacetate (NTA), ethylenediamine-N,N,N′,N′-tetraacetate (EDTA), (S,S)-ethylenediamine-N,N′-disuccinic acid (S,S-EDDS) and diethylenetriamine-N,N,N′,N″,N″-pentaacetate (DTPA)] towards mono-, di- and tri-alkyltin(IV) cations [(CH3)Sn3 +, (CH3)2Sn2 +, (C2H5)2Sn2 +, (CH3)3Sn+ or (C2H5)3Sn+] was studied, in aqueous solutions, by ISE-H+ potentiometry, at I = 0.1 mol L− 1 (NaCl) and at T = 298.15 K. In all the systems RxSn(4 − x)+ − APC (R = CH3 or C2H5) a strong 1:1 species is formed together with protonated, hydroxo and dinuclear complexes. The values of log K are roughly linearly dependent on the charge of both the cation and the anion, and the very simple correlation log K = (1.50 ± 0.05) zanion · zcation can account for the stability of all the complexes, but hydroxo species, formed in the experimental conditions used in this investigation. The sequestering ability of APCs in each system was evaluated, at different pH values, by using the parameter pL0.5, i.e., the total ligand concentration necessary to bind 50% of alkyltin(IV) cation trace.
Salvatore Cataldo; Concetta De Stefano; Antonio Gianguzza; Alberto Pettignano; Silvio Sammartano. Sequestration of alkyltin(IV) cations by complexation with amino-polycarboxylic chelating agents. Journal of Molecular Liquids 2013, 187, 74 -82.
AMA StyleSalvatore Cataldo, Concetta De Stefano, Antonio Gianguzza, Alberto Pettignano, Silvio Sammartano. Sequestration of alkyltin(IV) cations by complexation with amino-polycarboxylic chelating agents. Journal of Molecular Liquids. 2013; 187 ():74-82.
Chicago/Turabian StyleSalvatore Cataldo; Concetta De Stefano; Antonio Gianguzza; Alberto Pettignano; Silvio Sammartano. 2013. "Sequestration of alkyltin(IV) cations by complexation with amino-polycarboxylic chelating agents." Journal of Molecular Liquids 187, no. : 74-82.