Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO<sub>2</sub>

Andry Tahina Rabeharitsara; Ando Princia Randriamalala; Nambinina Richard Randriana; Baholy Robijaona; Marie Hanitriniaina Ratsimba

doi:doi:10.11648/j.ajpst.20220802.12

Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO₂

Andry Tahina Rabeharitsara, Ando Princia Randriamalala, Nambinina Richard Randriana, Baholy Robijaona, Marie Hanitriniaina Ratsimba

Published in American Journal of Polymer Science and Technology (Volume 8, Issue 2)

Received: 12 July 2022 Accepted: 27 July 2022 Published: 5 August 2022

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Abstract

The valorization of pozzolana into pn-pozzolana used as water softening was studied. This article treated particularly the valorization of the pn-pozzolana and pn-SiO₂ by adding iron-Fe atoms to give the Fe-pn-pozzolana and Fe-pn-SiO₂. Two synthesis procedures were used with the ironIIethoxide Fe(OEt)₂ as precursor material of the iron-Fe atoms deposits on the pn-pozzolana: first there was the solid-solid synthesis where the pn-pozzolana and the Fe(OEt)₂ are both in solid phase; then there was the solid-liquid synthesis where the Fe(OEt)₂ was a liquid phase solution and pn-pozzolana still in solid phase. It was found that the conversion of the Fe(OEt)₂ deposited on the pn-pozzolana depended very significantly on its amount in relation to the pn of the pn-pozzolana. Thus, as the amount of the Fe(OEt)₂ increased, so its conversion and thus the deposit of the iron-Fe atoms on the pn-pozzolana was better. The ratio noted: “7×n”; where n was the moles numbers of the Fe(OEt)₂ on each monomer unit composing the pn; allowed to parameterize each tests. Thus, seeing that one mole of pn contains 7 moles of pn, hence the total number of the Fe(OEt)₂ deposited in an n-pn trial was "7×n". Consequently, it was shown that the radical mechanism of the iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO₂ by the intermediate of the Fe(OEt)₂ passed initially by the formation of an intermediate by dismutation of the neighboring molecules of the Fe(OEt)₂ with iron-Fe atoms depositions followed by the formation of a by-product “diethyl-peroxide” with other iron-Fe atoms depositions by which the reactions progress had been followed. This mechanism allowed to understand and explain the excellence of the iron-Fe atoms depositions on pn-pozzolana or pn-SiO₂. Thus, a kinetic study of this Fe(OEt)₂ on the pn-pozzolana followed by the iron-Fe atoms depositions had been carried out at 55°C with the optimum ratio "7×4" and allowed to evaluate and calculate the value of its rate constant of the order of 0.6841 [mol×l^-1×s^-1] with 2nd partial order in relation to the Fe(OEt)₂. Finally, some Fe-pn-pozzolana and Fe-pn-SiO₂ materials were synthesized followed by their characterizations in particular by xrf-spectrophotometer which made it possible to confirm the pn's role of the pn-pozzolana as support promoting the excellent iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO₂ by the intermediate of the ironIIethoxide Fe(OEt)₂ with weight dispersion and alkene rate in the order respectively of 5.11% à 23.02% and 5.59E-4 [mol×g^-1] to 8.91E-4 [mol×g^-1].

Published in	American Journal of Polymer Science and Technology (Volume 8, Issue 2)
DOI	10.11648/j.ajpst.20220802.12
Page(s)	28-37
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

Pn, Pozzolana, Pn-Pozzolana, Fe-pn-Pozzolana, Fe-Pn-SiO₂, IronIIethoxide-Fe(OEt)₂

References

[1]	Rabemananjara Marie Louise - ^«Synthèse de PN-pouzzolane et sa valorisation à l’adsorption des polymères marron d’acide citrique et en échangeur cationique PN-pouzzolane-Na^» - [Synthesis of PN-pouzzolan and its valorisation for the adsorption of citric acid brown polymers and in PN-pouzzolan-Na cationic exchanger] Mémoire de fin d’étude en vue de l’obtention du diplôme de master titre ingénieur en génie des procédés chimiques et industriels. Ecole Supérieure Polytechnique Antananarivo (E. S. P. A) – Université d’Antananarivo. 2018 - promotion 2018 – Soutenue le 10 Janvier 2020.
[2]	Andry Tahina Rabeharitsara, Nicole Rabemananjara, Nambinina Richard Randriana ^«Black Citric Acid Polymer (PN) Pozzolana Activated- Na-PN-Pozzolana-CE Material Synthesis Tested As Cationic Exchanger^» American Journal of Applied Chemistry; Volume 7, issue 6, December 2019, Pages: 145-160.
[3]	Sammy Eric Andriambola – ^«Valorisation de l’acide citrique en polymères et en sels de mono- di- et tri-ammonium^»-[Valorization of citric acid into polymers and mono-di- and tri-ammonium salts]. Mémoire de fin d’étude en vue de l’obtention du diplôme d’Ingénieur en Génie Chimique. E. S. P. A. Université d’Antananarivo. Promotion 2013.
[4]	Nicole Rabemananjara. ^«Test d’auto-inflammation du mélange polymère noir d’acide citrique (PN) et du fuel oil (FO) – Etude de la formation de coke^» - [Auto-ignition test of black polymer mixture of citric acid (PN) and fuel oil (FO) - Study of coke formation]. Mémoire de fin d’étude en vue de l’obtention du diplôme de Licence en génie des procédés chimiques et industriels. Ecole Supérieure Polytechnique Antananarivo (E. S. P. A) – Université d’Antananarivo. Promotion 2017 – Soutenue le 28 Mars 2017.
[5]	Andry Tahina Rabeharitsara, Nicole Rabemananjara, Nambinina Richard Randriana, Haritiana Jeannelle Rakotonirina, Edouard Andrianarison, André Razafimandefitra, Baholy Robijaona. ^«Auto-Inflammation Test of Black Citric Acid Polymer (PN) and Fuel Oil (FO) Mixes – Coke Formation^». American Journal of Applied Chemistry. Vol. 5, No. 3, June 2017. doi: 10.11648/j.ajac.20170503.11.
[6]	Marson Randrianomenjanahary Avotra – ^«La synthese au laboratoire de l’ethanolate de sodium, du citrate tri-sodium, de l’ethanolate de fer-II et du chlorure de fer-II avec de l’ethanol 90°^» - [Laboratory Synthesis of Sodium Ethanolate, Tri-Sodium Citrate, Iron II Ethanolate and Iron II Chloride With 90° Ethanol]. Mémoire de fin d’étude en vue de l’obtention du diplôme de Licence en génie des procédés chimiques et industriels. Ecole Supérieure Polytechnique Antananarivo (E. S. P. A) – Université d’Antananarivo - Promotion 2020 – Soutenu le 4 Août 2021.
[7]	Andry Tahina Rabeharitsara, Avotra Marson Randrianomenjanahary, Nambinina Richard Randriana, ^«Laboratory Synthesis and Titrations of IronIIchloride-FeCl₂ and IronII Ethoxide-Fe(OEt)₂ Using Ethanol-90°^» - Hexane and Sodium Ethoxide-Na (OEt)” American Journal of Applied Chemistry. Vol. 9, No. 5, August 2021, pp. 123-130. doi: 10.11648/j.ajac.20210905.11.
[8]	Aurélien Flura – ^«Réduction Sélective Catalytique Des Nox Par Des Composes Oxygénés^» - [Selective Catalytic Reduction Of Nox By Oxygenated Compounds]. Thèse pour l'obtention du Grade de Docteur De L'Université De Poitiers. Soutenue le 01 Juillet 2011.
[9]	Behevitra Rovatahianjanahary - « Synthèse de catalyseurs homogènes B_XH⁺ supportés sur les alcènes des aromatiques et des polynucléaires aromatiques oxygénés composant le bois du pin par traitement à l’acide sulfurique – Application dans la synthèse des polymères noires d’acide citrique » - [Synthesis of homogeneous B_XH⁺ catalysts supported on the alkenes of the aromatics and oxygenated aromatic polynuclei composing pine wood by treatment with sulfuric acid - Application in the synthesis of black polymers of citric acid]. Mémoire de fin d’étude en vue de l’obtention du diplôme de Licence en génie des procédés chimiques et industriels. Ecole Supérieure Polytechnique Antananarivo (E. S. P. A) – Université d’Antananarivo. Promotion 2018 – Soutenue le 26 Juillet 2018.
[10]	Andry Tahina Rabeharitsara, Behevitra Rovatahianjanahary, Nambinina Richard Randriana – «Pine Wood Powder Treatment To B_XH⁺ Homogeneous Catalyst (H⁺/H₂SO₄) Supported On Its Aromatics And PNA – Application In Black Citric Acid Polymer Synthesis». American Journal of Polymer Science and Technology. Vol. 4, No. 1, May 2018, pp. 1-27. doi: 10.11648/j.ajpst.20180401.11.
[11]	Andry Tahina Rabeharitsara, Phandry Nomena Ndjiva Rabearimihaja, – “Betacarotenes Dosage by Hydrofluoric Acid Solution and Validation of This New Process by SPC”. American Journal of Applied Chemistry. Vol. 4, No. 3, 2016, pp. 91-96. doi: 10.11648/j.ajac.20160403.14. Received: April 11, 2016; Accepted: April 20, 2016; Published: May 13, 2016.
[12]	Rabearimihaja Phandry Taryh Nomena Ndjiva - «Valorisation Du Betacarotene Extrait De L’huile De Palme Brute Par De L’acide Acetique Pour La Determination Des Teneurs En Eau De Produits Petroliers (Gazole /Fuel-Oil) Et Dosage Des Teneurs En Betacarotene Par De L’acide Fluorhydrique» - [Valorization of Betacarotene Extracted from Crude Palm Oil by Acetic Acid for the Determination of Water Content of Petroleum Products (Diesel/Fuel Oil) and Determination of Betacarotene Content by Hydrofluoric Acid]. Mémoire de fin d’Etudes en vue de l’obtention du Diplôme de Master Titre Ingénieur en Génie des Procédés chimiques et Industriels - Ecole Supérieure Polytechnique Antananarivo. Université d’Antananarivo – Promotion 2015 – Soutenue le 06 Mai 2016.

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Andry Tahina Rabeharitsara, Ando Princia Randriamalala, Nambinina Richard Randriana, Baholy Robijaona, Marie Hanitriniaina Ratsimba. (2022). Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. American Journal of Polymer Science and Technology, 8(2), 28-37. https://doi.org/10.11648/j.ajpst.20220802.12

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ACS Style

Andry Tahina Rabeharitsara; Ando Princia Randriamalala; Nambinina Richard Randriana; Baholy Robijaona; Marie Hanitriniaina Ratsimba. Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. Am. J. Polym. Sci. Technol. 2022, 8(2), 28-37. doi: 10.11648/j.ajpst.20220802.12

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AMA Style

Andry Tahina Rabeharitsara, Ando Princia Randriamalala, Nambinina Richard Randriana, Baholy Robijaona, Marie Hanitriniaina Ratsimba. Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. Am J Polym Sci Technol. 2022;8(2):28-37. doi: 10.11648/j.ajpst.20220802.12

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@article{10.11648/j.ajpst.20220802.12,
  author = {Andry Tahina Rabeharitsara and Ando Princia Randriamalala and Nambinina Richard Randriana and Baholy Robijaona and Marie Hanitriniaina Ratsimba},
  title = {Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2},
  journal = {American Journal of Polymer Science and Technology},
  volume = {8},
  number = {2},
  pages = {28-37},
  doi = {10.11648/j.ajpst.20220802.12},
  url = {https://doi.org/10.11648/j.ajpst.20220802.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpst.20220802.12},
  abstract = {The valorization of pozzolana into pn-pozzolana used as water softening was studied. This article treated particularly the valorization of the pn-pozzolana and pn-SiO2 by adding iron-Fe atoms to give the Fe-pn-pozzolana and Fe-pn-SiO2. Two synthesis procedures were used with the ironIIethoxide Fe(OEt)2 as precursor material of the iron-Fe atoms deposits on the pn-pozzolana: first there was the solid-solid synthesis where the pn-pozzolana and the Fe(OEt)2 are both in solid phase; then there was the solid-liquid synthesis where the Fe(OEt)2 was a liquid phase solution and pn-pozzolana still in solid phase. It was found that the conversion of the Fe(OEt)2 deposited on the pn-pozzolana depended very significantly on its amount in relation to the pn of the pn-pozzolana. Thus, as the amount of the Fe(OEt)2 increased, so its conversion and thus the deposit of the iron-Fe atoms on the pn-pozzolana was better. The ratio noted: “7×n”; where n was the moles numbers of the Fe(OEt)2 on each monomer unit composing the pn; allowed to parameterize each tests. Thus, seeing that one mole of pn contains 7 moles of pn, hence the total number of the Fe(OEt)2 deposited in an n-pn trial was "7×n". Consequently, it was shown that the radical mechanism of the iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the Fe(OEt)2 passed initially by the formation of an intermediate by dismutation of the neighboring molecules of the Fe(OEt)2 with iron-Fe atoms depositions followed by the formation of a by-product “diethyl-peroxide” with other iron-Fe atoms depositions by which the reactions progress had been followed. This mechanism allowed to understand and explain the excellence of the iron-Fe atoms depositions on pn-pozzolana or pn-SiO2. Thus, a kinetic study of this Fe(OEt)2 on the pn-pozzolana followed by the iron-Fe atoms depositions had been carried out at 55°C with the optimum ratio "7×4" and allowed to evaluate and calculate the value of its rate constant of the order of 0.6841 [mol×l-1×s-1] with 2nd partial order in relation to the Fe(OEt)2. Finally, some Fe-pn-pozzolana and Fe-pn-SiO2 materials were synthesized followed by their characterizations in particular by xrf-spectrophotometer which made it possible to confirm the pn's role of the pn-pozzolana as support promoting the excellent iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the ironIIethoxide Fe(OEt)2 with weight dispersion and alkene rate in the order respectively of 5.11% à 23.02% and 5.59E-4 [mol×g-1] to 8.91E-4 [mol×g-1].},
 year = {2022}
}

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TY  - JOUR
T1  - Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2
AU  - Andry Tahina Rabeharitsara
AU  - Ando Princia Randriamalala
AU  - Nambinina Richard Randriana
AU  - Baholy Robijaona
AU  - Marie Hanitriniaina Ratsimba
Y1  - 2022/08/05
PY  - 2022
N1  - https://doi.org/10.11648/j.ajpst.20220802.12
DO  - 10.11648/j.ajpst.20220802.12
T2  - American Journal of Polymer Science and Technology
JF  - American Journal of Polymer Science and Technology
JO  - American Journal of Polymer Science and Technology
SP  - 28
EP  - 37
PB  - Science Publishing Group
SN  - 2575-5986
UR  - https://doi.org/10.11648/j.ajpst.20220802.12
AB  - The valorization of pozzolana into pn-pozzolana used as water softening was studied. This article treated particularly the valorization of the pn-pozzolana and pn-SiO2 by adding iron-Fe atoms to give the Fe-pn-pozzolana and Fe-pn-SiO2. Two synthesis procedures were used with the ironIIethoxide Fe(OEt)2 as precursor material of the iron-Fe atoms deposits on the pn-pozzolana: first there was the solid-solid synthesis where the pn-pozzolana and the Fe(OEt)2 are both in solid phase; then there was the solid-liquid synthesis where the Fe(OEt)2 was a liquid phase solution and pn-pozzolana still in solid phase. It was found that the conversion of the Fe(OEt)2 deposited on the pn-pozzolana depended very significantly on its amount in relation to the pn of the pn-pozzolana. Thus, as the amount of the Fe(OEt)2 increased, so its conversion and thus the deposit of the iron-Fe atoms on the pn-pozzolana was better. The ratio noted: “7×n”; where n was the moles numbers of the Fe(OEt)2 on each monomer unit composing the pn; allowed to parameterize each tests. Thus, seeing that one mole of pn contains 7 moles of pn, hence the total number of the Fe(OEt)2 deposited in an n-pn trial was "7×n". Consequently, it was shown that the radical mechanism of the iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the Fe(OEt)2 passed initially by the formation of an intermediate by dismutation of the neighboring molecules of the Fe(OEt)2 with iron-Fe atoms depositions followed by the formation of a by-product “diethyl-peroxide” with other iron-Fe atoms depositions by which the reactions progress had been followed. This mechanism allowed to understand and explain the excellence of the iron-Fe atoms depositions on pn-pozzolana or pn-SiO2. Thus, a kinetic study of this Fe(OEt)2 on the pn-pozzolana followed by the iron-Fe atoms depositions had been carried out at 55°C with the optimum ratio "7×4" and allowed to evaluate and calculate the value of its rate constant of the order of 0.6841 [mol×l-1×s-1] with 2nd partial order in relation to the Fe(OEt)2. Finally, some Fe-pn-pozzolana and Fe-pn-SiO2 materials were synthesized followed by their characterizations in particular by xrf-spectrophotometer which made it possible to confirm the pn's role of the pn-pozzolana as support promoting the excellent iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the ironIIethoxide Fe(OEt)2 with weight dispersion and alkene rate in the order respectively of 5.11% à 23.02% and 5.59E-4 [mol×g-1] to 8.91E-4 [mol×g-1].
VL  - 8
IS  - 2
ER  -

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Andry Tahina Rabeharitsara

Chemical Process Engineering Department (Ecole Supérieure Polytechnique Antananarivo – E.S.P.A), Antananarivo University, Antananarivo, Madagascar
Ando Princia Randriamalala

Chemical Process Engineering Department (Ecole Supérieure Polytechnique Antananarivo – E.S.P.A), Antananarivo University, Antananarivo, Madagascar
Nambinina Richard Randriana

Chemical Process Engineering Department (Ecole Supérieure Polytechnique Antananarivo – E.S.P.A), Antananarivo University, Antananarivo, Madagascar
Baholy Robijaona

Chemical Process Engineering Department (Ecole Supérieure Polytechnique Antananarivo – E.S.P.A), Antananarivo University, Antananarivo, Madagascar
Marie Hanitriniaina Ratsimba

Chemical Process Engineering Department (Ecole Supérieure Polytechnique Antananarivo – E.S.P.A), Antananarivo University, Antananarivo, Madagascar

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APA Style

Andry Tahina Rabeharitsara, Ando Princia Randriamalala, Nambinina Richard Randriana, Baholy Robijaona, Marie Hanitriniaina Ratsimba. (2022). Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. American Journal of Polymer Science and Technology, 8(2), 28-37. https://doi.org/10.11648/j.ajpst.20220802.12

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ACS Style

Andry Tahina Rabeharitsara; Ando Princia Randriamalala; Nambinina Richard Randriana; Baholy Robijaona; Marie Hanitriniaina Ratsimba. Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. Am. J. Polym. Sci. Technol. 2022, 8(2), 28-37. doi: 10.11648/j.ajpst.20220802.12

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AMA Style

Andry Tahina Rabeharitsara, Ando Princia Randriamalala, Nambinina Richard Randriana, Baholy Robijaona, Marie Hanitriniaina Ratsimba. Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2. Am J Polym Sci Technol. 2022;8(2):28-37. doi: 10.11648/j.ajpst.20220802.12

Copy | Download

@article{10.11648/j.ajpst.20220802.12,
  author = {Andry Tahina Rabeharitsara and Ando Princia Randriamalala and Nambinina Richard Randriana and Baholy Robijaona and Marie Hanitriniaina Ratsimba},
  title = {Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2},
  journal = {American Journal of Polymer Science and Technology},
  volume = {8},
  number = {2},
  pages = {28-37},
  doi = {10.11648/j.ajpst.20220802.12},
  url = {https://doi.org/10.11648/j.ajpst.20220802.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpst.20220802.12},
  abstract = {The valorization of pozzolana into pn-pozzolana used as water softening was studied. This article treated particularly the valorization of the pn-pozzolana and pn-SiO2 by adding iron-Fe atoms to give the Fe-pn-pozzolana and Fe-pn-SiO2. Two synthesis procedures were used with the ironIIethoxide Fe(OEt)2 as precursor material of the iron-Fe atoms deposits on the pn-pozzolana: first there was the solid-solid synthesis where the pn-pozzolana and the Fe(OEt)2 are both in solid phase; then there was the solid-liquid synthesis where the Fe(OEt)2 was a liquid phase solution and pn-pozzolana still in solid phase. It was found that the conversion of the Fe(OEt)2 deposited on the pn-pozzolana depended very significantly on its amount in relation to the pn of the pn-pozzolana. Thus, as the amount of the Fe(OEt)2 increased, so its conversion and thus the deposit of the iron-Fe atoms on the pn-pozzolana was better. The ratio noted: “7×n”; where n was the moles numbers of the Fe(OEt)2 on each monomer unit composing the pn; allowed to parameterize each tests. Thus, seeing that one mole of pn contains 7 moles of pn, hence the total number of the Fe(OEt)2 deposited in an n-pn trial was "7×n". Consequently, it was shown that the radical mechanism of the iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the Fe(OEt)2 passed initially by the formation of an intermediate by dismutation of the neighboring molecules of the Fe(OEt)2 with iron-Fe atoms depositions followed by the formation of a by-product “diethyl-peroxide” with other iron-Fe atoms depositions by which the reactions progress had been followed. This mechanism allowed to understand and explain the excellence of the iron-Fe atoms depositions on pn-pozzolana or pn-SiO2. Thus, a kinetic study of this Fe(OEt)2 on the pn-pozzolana followed by the iron-Fe atoms depositions had been carried out at 55°C with the optimum ratio "7×4" and allowed to evaluate and calculate the value of its rate constant of the order of 0.6841 [mol×l-1×s-1] with 2nd partial order in relation to the Fe(OEt)2. Finally, some Fe-pn-pozzolana and Fe-pn-SiO2 materials were synthesized followed by their characterizations in particular by xrf-spectrophotometer which made it possible to confirm the pn's role of the pn-pozzolana as support promoting the excellent iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the ironIIethoxide Fe(OEt)2 with weight dispersion and alkene rate in the order respectively of 5.11% à 23.02% and 5.59E-4 [mol×g-1] to 8.91E-4 [mol×g-1].},
 year = {2022}
}

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TY  - JOUR
T1  - Valorization of the Pn-Pozzolana to the Synthesis of Fe-pn-Pozzolana Study - Application to the Synthesis of the Fe-Pn-SiO2
AU  - Andry Tahina Rabeharitsara
AU  - Ando Princia Randriamalala
AU  - Nambinina Richard Randriana
AU  - Baholy Robijaona
AU  - Marie Hanitriniaina Ratsimba
Y1  - 2022/08/05
PY  - 2022
N1  - https://doi.org/10.11648/j.ajpst.20220802.12
DO  - 10.11648/j.ajpst.20220802.12
T2  - American Journal of Polymer Science and Technology
JF  - American Journal of Polymer Science and Technology
JO  - American Journal of Polymer Science and Technology
SP  - 28
EP  - 37
PB  - Science Publishing Group
SN  - 2575-5986
UR  - https://doi.org/10.11648/j.ajpst.20220802.12
AB  - The valorization of pozzolana into pn-pozzolana used as water softening was studied. This article treated particularly the valorization of the pn-pozzolana and pn-SiO2 by adding iron-Fe atoms to give the Fe-pn-pozzolana and Fe-pn-SiO2. Two synthesis procedures were used with the ironIIethoxide Fe(OEt)2 as precursor material of the iron-Fe atoms deposits on the pn-pozzolana: first there was the solid-solid synthesis where the pn-pozzolana and the Fe(OEt)2 are both in solid phase; then there was the solid-liquid synthesis where the Fe(OEt)2 was a liquid phase solution and pn-pozzolana still in solid phase. It was found that the conversion of the Fe(OEt)2 deposited on the pn-pozzolana depended very significantly on its amount in relation to the pn of the pn-pozzolana. Thus, as the amount of the Fe(OEt)2 increased, so its conversion and thus the deposit of the iron-Fe atoms on the pn-pozzolana was better. The ratio noted: “7×n”; where n was the moles numbers of the Fe(OEt)2 on each monomer unit composing the pn; allowed to parameterize each tests. Thus, seeing that one mole of pn contains 7 moles of pn, hence the total number of the Fe(OEt)2 deposited in an n-pn trial was "7×n". Consequently, it was shown that the radical mechanism of the iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the Fe(OEt)2 passed initially by the formation of an intermediate by dismutation of the neighboring molecules of the Fe(OEt)2 with iron-Fe atoms depositions followed by the formation of a by-product “diethyl-peroxide” with other iron-Fe atoms depositions by which the reactions progress had been followed. This mechanism allowed to understand and explain the excellence of the iron-Fe atoms depositions on pn-pozzolana or pn-SiO2. Thus, a kinetic study of this Fe(OEt)2 on the pn-pozzolana followed by the iron-Fe atoms depositions had been carried out at 55°C with the optimum ratio "7×4" and allowed to evaluate and calculate the value of its rate constant of the order of 0.6841 [mol×l-1×s-1] with 2nd partial order in relation to the Fe(OEt)2. Finally, some Fe-pn-pozzolana and Fe-pn-SiO2 materials were synthesized followed by their characterizations in particular by xrf-spectrophotometer which made it possible to confirm the pn's role of the pn-pozzolana as support promoting the excellent iron-Fe atoms depositions on the pn-pozzolana or the pn-SiO2 by the intermediate of the ironIIethoxide Fe(OEt)2 with weight dispersion and alkene rate in the order respectively of 5.11% à 23.02% and 5.59E-4 [mol×g-1] to 8.91E-4 [mol×g-1].
VL  - 8
IS  - 2
ER  -

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