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REVISTA DE CHIMIE
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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2022, Volume 73, Issue 2, 17-32

https://doi.org/10.37358/RC.22.2.8516

Gheorghe Dobra, Santiago Garcia-Granda, Adina Negre, Mihaela Ciopec, Nicoleta Nemes, Hulka Iosif, Petru Negrea, Narcis Dutean, Sorin Iliev, Lucian Cotet, Alina Boiangiu, Laurentiu Filipescu

Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics

Abstract:

Aluminum hydroxide is a key product for the industrial production of alumiana and aluminium, ceramics insulator and refractories, desiccants, absorbents, flame retardants, filers for plastics and rubbers, catalysts, and various construction materials. The production of these arrays of useful material products is grounded on the multiple thermal decomposition pathways of Al(OH)3, which involve major crystallographic dislocations and many microstructure reconfigurations on variable lines of phase transitions, from the raw material up to large varieties of precursors and commercial grade products. A wide range of literature on this subject is available, and recent reviews cover suitable information about preparation and characterization of different activated alumina products with specific properties and applications. In our previous papers, there was studied the mechanisms of aluminum hydroxide phase transitions, during low temperature calcination, namely, at 260oC, 300oC, 400oC and 600 oC, under chosen particularly conditions, for promoting the nucleation of the amorphous phases. Collected data suggest that raw aluminum hydroxide; dried, milled and classified is a precursor for the new low temperature activated alumina transition phases, carrying distinctive characteristics and properties, due to products enrichment in amorphous phases. Accordingly, as effects of the main driving factors (temperature and rate of heating, and initial particle size dimension) on the aluminum hydroxide as new precursor, notable changes were observed in products mineral composition, morphology and specific surface area, pore size, pore distribution, and the particle size distribution. Beside, some other secondary effects have to be apprehended. For example, the main phase transition process dinamic factors control over some physical and technical properties of the new products, like: absolute density, brightness, oil absorption capacity and water absorption capacity. The purpose of this work was to continue the characterization of low temperature activation alumina products, and also, to measure the adsorption capacity and to reveal adsorption kinetics mechanisms. Thus, the first step of survey was silver adsorption maximum capacity measurements for all sample prepared by heating the precursor alumina hydroxide, milled and classified as 5 different dimension size fractions to 260, 300, 400 and 600oC. Hereinafter, four samples, carefully selected as representative for the entire lot of samples, were used for the study of kinetics mechanism and data fitting to the adequate kinetic equations. Confident data validate the pseudo second order kinetic model for the entire activation process, independently of samples heating temperature and particles dimension.
Keywords:
aluminium hydroxide; activated alumina; silver; waste water; adsorption; kinetics

Issue: 2022, Volume 73, Issue 2
Pages: 17-32
Publication date: 2022/5/2
https://doi.org/10.37358/RC.22.2.8516
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Creative Commons License
This article is published under the Creative Commons Attribution 4.0 International License
Citation Styles
Cite this article as:
DOBRA, G., GARCIA-GRANDA, S., NEGRE, A., CIOPEC, M., NEMES, N., IOSIF, H., NEGREA, P., DUTEAN, N., ILIEV, S., COTET, L., BOIANGIU, A., FILIPESCU, L., Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics, Rev. Chim., 73(2), 2022, 17-32.

Vancouver
Dobra G, Garcia-Granda S, Negre A, Ciopec M, Nemes N, Iosif H, Negrea P, Dutean N, Iliev S, Cotet L, Boiangiu A, Filipescu L. Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics. Rev. Chim.[internet]. 2022 Feb;73(2):17-32. Available from: https://doi.org/10.37358/RC.22.2.8516


APA 6th edition
Dobra, G., Garcia-Granda, S., Negre, A., Ciopec, M., Nemes, N., Iosif, H.,... Filipescu, L. (2022). Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics. Revista de Chimie, 73(2), 17-32. https://doi.org/10.37358/RC.22.2.8516


Harvard
Dobra, G., Garcia-Granda, S., Negre, A., Ciopec, M., Nemes, N., Iosif, H., Negrea, P., Dutean, N., Iliev, S., Cotet, L., Boiangiu, A., Filipescu, L. (2022). 'Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics', Revista de Chimie, 73(2), pp. 17-32. https://doi.org/10.37358/RC.22.2.8516


IEEE
G. Dobra, S. Garcia-Granda, A. Negre, M. Ciopec, N. Nemes, H. Iosif, P. Negrea, N. Dutean, S. Iliev, L. Cotet, A. Boiangiu, L. Filipescu, "Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics". Revista de Chimie, vol. 73, no. 2, pp. 17-32, 2022. [online]. https://doi.org/10.37358/RC.22.2.8516


Text
Gheorghe Dobra, Santiago Garcia-Granda, Adina Negre, Mihaela Ciopec, Nicoleta Nemes, Hulka Iosif, Petru Negrea, Narcis Dutean, Sorin Iliev, Lucian Cotet, Alina Boiangiu, Laurentiu Filipescu,
Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics,
Revista de Chimie,
Volume 73, Issue 2,
2022,
Pages 17-32,
ISSN 2668-8212,
https://doi.org/10.37358/RC.22.2.8516.
(https://revistadechimie.ro/Articles.asp?ID=8516)
Keywords: aluminium hydroxide; activated alumina; silver; waste water; adsorption; kinetics


RIS
TY - JOUR
T1 - Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics
A1 - Dobra, Gheorghe
A2 - Garcia-Granda, Santiago
A3 - Negre, Adina
A4 - Ciopec, Mihaela
A5 - Nemes, Nicoleta
A6 - Iosif, Hulka
A7 - Negrea, Petru
A8 - Dutean, Narcis
A9 - Iliev, Sorin
A10 - Cotet, Lucian
A11 - Boiangiu, Alina
A12 - Filipescu, Laurentiu
JF - Revista de Chimie
JO - Rev. Chim.
PB - Revista de Chimie SRL
SN - 2668-8212
Y1 - 2022
VL - 73
IS - 2
SP - 17
EP - 32
UR - https://doi.org/10.37358/RC.22.2.8516
KW - aluminium hydroxide
KW - activated alumina
KW - silver
KW - waste water
KW - adsorption
KW - kinetics
ER -


BibTex
@article{RevCh2022P17,
author = {Dobra Gheorghe and Garcia-Granda Santiago and Negre Adina and Ciopec Mihaela and Nemes Nicoleta and Iosif Hulka and Negrea Petru and Dutean Narcis and Iliev Sorin and Cotet Lucian and Boiangiu Alina and Filipescu Laurentiu},
title = {Silver Adsorption on the Low Temperature Activated Alumina Grades. I. Adsorption Capacity and Kinetics},
journal = {Revista de Chimie},
volume = {73},
number = {2},
pages = {17-32},
year = {2022},
issn = {2668-8212},
doi = {https://doi.org/10.37358/RC.22.2.8516},
url = {https://revistadechimie.ro/Articles.asp?ID=8516}
}


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