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Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs

The adsorption of fluorescein dye (FD) on wild herb microparticles (Juniperus (JH) and Solenostemma argel (Del) Hayne (SH)) was studied to elucidate the changes in adsorption behavior with various parameters, such as initial concentration, adsorbent dosage, pH, contact time, and temperature. It was...

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Autores principales: Al-Senani, Ghadah M., Al-Kadhi, Nada S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7201707/
https://www.ncbi.nlm.nih.gov/pubmed/32395130
http://dx.doi.org/10.1155/2020/8019274
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author Al-Senani, Ghadah M.
Al-Kadhi, Nada S.
author_facet Al-Senani, Ghadah M.
Al-Kadhi, Nada S.
author_sort Al-Senani, Ghadah M.
collection PubMed
description The adsorption of fluorescein dye (FD) on wild herb microparticles (Juniperus (JH) and Solenostemma argel (Del) Hayne (SH)) was studied to elucidate the changes in adsorption behavior with various parameters, such as initial concentration, adsorbent dosage, pH, contact time, and temperature. It was determined that the adsorption percentage of JH for FD was as high as 85.5%, which was higher than that of SH (71.9%). The morphologies of JH and SH were analyzed using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses. The JH and SH adsorbents contained different functional groups, which were involved in the binding of the FD molecules during adsorption. The XRD patterns of JH and SH confirmed the presence of a combination of amorphous and crystalline phases in their structures. The SEM images of the surface of JH revealed the presence of deep pores ranging in size from 1.9 to 3.5 μm, while SH contained smaller pores ranging in size from 130 to 350 μm, which could help absorb large quantities of FD. The Freundlich model fitted the adsorption isotherms better than the Langmuir model. The values of the Freundlich equilibrium coefficient and separation factor ranged from 1 to 2 and from 0 to 1, respectively. The maximum adsorption capacities of JH and SH were determined to be 2.91 and 2.565 mg/g, respectively. Four kinetic models were used to analyze the experimental data, and it was determined that the pseudo-second-order kinetic model best described the adsorption process, which involved chemical adsorption and the internal diffusion. Thermodynamic parameters, including the enthalpy, entropy, and Gibbs free energy, were calculated. These parameters indicated that the adsorption of FD on JH was spontaneous and endothermic and the adsorption of FD on SH was unspontaneous and exothermic.
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spelling pubmed-72017072020-05-11 Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs Al-Senani, Ghadah M. Al-Kadhi, Nada S. Int J Anal Chem Research Article The adsorption of fluorescein dye (FD) on wild herb microparticles (Juniperus (JH) and Solenostemma argel (Del) Hayne (SH)) was studied to elucidate the changes in adsorption behavior with various parameters, such as initial concentration, adsorbent dosage, pH, contact time, and temperature. It was determined that the adsorption percentage of JH for FD was as high as 85.5%, which was higher than that of SH (71.9%). The morphologies of JH and SH were analyzed using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses. The JH and SH adsorbents contained different functional groups, which were involved in the binding of the FD molecules during adsorption. The XRD patterns of JH and SH confirmed the presence of a combination of amorphous and crystalline phases in their structures. The SEM images of the surface of JH revealed the presence of deep pores ranging in size from 1.9 to 3.5 μm, while SH contained smaller pores ranging in size from 130 to 350 μm, which could help absorb large quantities of FD. The Freundlich model fitted the adsorption isotherms better than the Langmuir model. The values of the Freundlich equilibrium coefficient and separation factor ranged from 1 to 2 and from 0 to 1, respectively. The maximum adsorption capacities of JH and SH were determined to be 2.91 and 2.565 mg/g, respectively. Four kinetic models were used to analyze the experimental data, and it was determined that the pseudo-second-order kinetic model best described the adsorption process, which involved chemical adsorption and the internal diffusion. Thermodynamic parameters, including the enthalpy, entropy, and Gibbs free energy, were calculated. These parameters indicated that the adsorption of FD on JH was spontaneous and endothermic and the adsorption of FD on SH was unspontaneous and exothermic. Hindawi 2020-01-16 /pmc/articles/PMC7201707/ /pubmed/32395130 http://dx.doi.org/10.1155/2020/8019274 Text en Copyright © 2020 Ghadah M. Al-Senani and Nada S. Al-Kadhi. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Al-Senani, Ghadah M.
Al-Kadhi, Nada S.
Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title_full Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title_fullStr Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title_full_unstemmed Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title_short Studies on Adsorption of Fluorescein Dye from Aqueous Solutions Using Wild Herbs
title_sort studies on adsorption of fluorescein dye from aqueous solutions using wild herbs
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7201707/
https://www.ncbi.nlm.nih.gov/pubmed/32395130
http://dx.doi.org/10.1155/2020/8019274
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