Tailoring the structural and morphological properties of hydroxyapatite materials to enhance the capture efficiency towards copper(<scp>ii</scp>) and lead(<scp>ii</scp>) ions

Campisi, Sebastiano; Castellano, Carlo; Gervasini, Antonella

doi:10.1039/c8nj00468d

Cited by 55 publications

(33 citation statements)

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“…HAP has even found ar ole in catalysis because of its easy functionalization. [55] Different metal specieso f catalytic interest (e.g.,C u, Co, Mn) [56] can be deposited on an HAP surface with uniformd ispersion of the metal centres, thanks to its peculiar surfacep roperties. With av iew to more sustainable activity for both environmental and industrial interest, HAP materials could be used as sorbents for polluting metal species, for example, for demetallationo fw astewaters by using metal-loaded HAPs as catalysts.…”

Section: Recent Developments In Academia and Industry And Challenges mentioning

confidence: 99%

Metal Oxides in Heterogeneous Oxidation Catalysis: State of the Art and Challenges for a More Sustainable World

2019

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This Review presents current knowledge, recent results, and challenges for the future in heterogeneous oxidation catalysis in liquid and gaseous phases on solid metal oxide catalysts. Metal oxides that are used as catalysts and their main structures and properties are summarized, as well as their catalytic properties in selective and total oxidation reactions, which were studied intensively, experimentally and theoretically, by Professor Jerzy Haber during his scientific life. Some emphasis is placed on the classical and unusual catalyst activation procedures for improving catalytic properties for better efficiency. For a more sustainable world, several examples are given of the oxidation of biomass derivatives to synthesize valuable chemicals and of other applications of metal oxides, such as depollution, photocatalysis, hydrogen production and fuel‐cell components. The importance of metal oxide catalysis in environmental and green chemistry and sustainability is discussed, and challenges for the future are considered.

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Section: Recent Developments In Academia and Industry And Challenges mentioning

confidence: 99%

Metal Oxides in Heterogeneous Oxidation Catalysis: State of the Art and Challenges for a More Sustainable World

2019

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“…Stoichiometric HAP was synthetized following a co-precipitation route as reported elsewhere (Campisi et al 2018;Lamonier et al 2011). Briefly summarizing, the synthesis consisted in a dropwise addition of a Ca(NO3)2•4H2O aqueous solution to a (NH4)2HPO4 solution.…”

Section: Synthesis Of Hapmentioning

confidence: 99%

“…Consequently, structural flexibility together with surface acid properties are responsible for the fact that heavy metal species trapped by HAP can occur with different mechanisms; the principals being ion exchange, surface complexation, and dissolution/precipitation (Campisi et al 2018;Flores-Cano et al 2016;Mousa et al 2016;Pham Minh et al 2013). The occurrence of a given adsorption mechanism depends on the nature of the metal species and operative conditions (Smičiklas et al 2009).…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

“…Indeed, HAP presents at least three different surface species suitable for cations adsorption on its surface: hydroxyl-, carbonate-and phosphate-groups. Previous studies reported that these sites can interact with variable strength with different cations, depending on the specific combination metal ion-active site (Campisi et al 2018).…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

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Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

2019

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In the present study, the Ni(II) and Co(II) adsorption efficiency and selectivity, as well adsorption mechanisms on a stoichiometric hydroxyapatite (HAP) surface have been investigated. Characterization studies (N2 adsorption/desorption and X-ray powder diffraction (XRPD) analyses) and adsorption tests under various operative conditions provided detailed information about the use of HAP in the de-metalation of wastewaters containing Ni and Co as polluted metal species. The sorption capacity of HAP has been evaluated by static batch adsorption tests varying initial concentration of Ni(II) and Co(II) species (from ca. 0.25 to 4.3 mM), contact time (from 15 min to 24 h), and pH (from 4 and 9) operative parameters. Proposed mechanisms of adsorption of Ni(II) and Co(II) on HAP surface are ion-exchange and surface complexation; a partial contribution of chemical precipitation from bulk solution should be considered at pH 9. In addition, adsorption isotherms of Ni(II) and Co(II) on HAP have been collected at 30°C and pH 4 and modeled by employing different equations. The maximum sorption capacities have been quantified as 0.317 mmol g-1 HAP (18.6 mg g-1 HAP) and 0.382 mmol g-1 HAP (22.5 mg g-1 HAP) for Ni(II) and Co(II), respectively. Selectivity to Co and Ni in the adsorption process on HAP has also been investigated; HAP has higher affinity towards Co than Ni species (Co:Ni=2.5:1, molar ratio).

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“…For environmental application, the absorbent nature of HAp is, probably, the most valuable feature. In particular, heavy metal retention ability is attributed to ion-exchange (Ca 2+ / metal ion), surface adsorption/complexation, dissolution-precipitation mechanism, with single or combined action depending on the metal nature [5]. Combining intrinsic affinities of HAp for metals with ductility of electrochemistry is a valuable route to develop monitoring systems and/or pollution remediation protocols [6].…”

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Hydroxyapatite-Based Electrodes for Metal Detection in Wastewater

Magni,

Sironi,

Ferri

et al. 2019

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Hydroxyapatite (HAp) is a biocompatible versatile material of formula Ca10(PO4)6(OH)2, insoluble in water within a wide pH range, chemically stable, relatively cheap and largely available. This mineral calcium phosphate has caught attention of scientists working in different fields of applied science, from medical engineering [1], to catalysis [2] and pollution remediation [3],[4]. For environmental application, the absorbent nature of HAp is, probably, the most valuable feature. In particular, heavy metal retention ability is attributed to ion-exchange (Ca2+/ metal ion), surface adsorption/complexation, dissolution-precipitation mechanism, with single or combined action depending on the metal nature [5]. Combining intrinsic affinities of HAp for metals with ductility of electrochemistry is a valuable route to develop monitoring systems and/or pollution remediation protocols [6]. In doing so, the main obstacle for the exploitation of HAp as electrode materials is its electrical insulation nature. To overcome this limitation combination with conductive substrate is necessary, preparing either blends or composite materials. In this context, a series of carbon-containing hydroxyapatite composites (C-HAp) have been prepared by co-precipitation synthesis, by varying the conductive carbon source. The prepared materials have been characterized by various physical-chemical techniques (FT-IR spectroscopy, XRPD, TEM-EDX, N2-adsorption/desorption analyses) and the electrical conductivity has been determined as a function of the carbon source. The most promising C-HAp composites have been used as electrode substrates to quantify some of the common heavy metals found in waste water from urban and/or industrial sites (e.g., Pb2+, Cd2+, Cu2+, Zn2+) using cyclic and differential voltammetry techniques. The sensitivity of C-HAp electrodes was compared with that of glassy carbon ones, chosen as reference material. Different electrode geometries have been taken into consideration (C-HAp powder pressed into a cavity electrode, or free-standing C-HAp one). The work is still in progress and among possible alternative routes we are going to prepare directly HAp-based electrodes by in situ electrodeposition of calcium phosphate on low cost electron collectors such as steel. The final aim is to employ the HAp-based electrode as cathode in microbial fuel cells that could act as sensors for the on-line detection of metal traces in the treated wastes. References: [1] J. Kolmas, S. Krukowski, A. Laskus, M. Jurkitewicz, Ceramics International, 2016, 42, 2472–2487. [2] A. Fihri, C. Len, R. S. Varma, A. Solhy, Coordin. Chem. Rev. 2017, 347, 48–76. [3] J. Reichert, J. G. P. Binner, J. Mater. Sci., 1996, 31, 1231-1241. [4] A. Corami, S. Mignardi, V. Ferrini, J. Hazard. Mater., 2007, 146, 164-170. [5] S. Campisi, C. Castellano, G. Gervasini, New J. Chem., 2018, 42, 4520-4530. [6] M.A. El Mhammedi, M. Achak, R. Najih, M. Bakasse, A. Chtaini, Mater. Chem. Phys., 2009, 115, 567–571.

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Tailoring the structural and morphological properties of hydroxyapatite materials to enhance the capture efficiency towards copper(ii) and lead(ii) ions

Abstract: This study deals with the use of calcium hydroxyapatite (HAP) materials as adsorbents for removing heavy metal ions from polluted waters.

Cited by 55 publications

References 79 publications

Metal Oxides in Heterogeneous Oxidation Catalysis: State of the Art and Challenges for a More Sustainable World

Metal Oxides in Heterogeneous Oxidation Catalysis: State of the Art and Challenges for a More Sustainable World

Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

Hydroxyapatite-Based Electrodes for Metal Detection in Wastewater

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