LAPSE:2023.24925
Published Article
LAPSE:2023.24925
Evaluation of the Adsorption Efficiency on the Removal of Lead(II) Ions from Aqueous Solutions Using Azadirachta indica Leaves as an Adsorbent
Abubakr Elkhaleefa, Ismat H. Ali, Eid I. Brima, Ihab Shigidi, Ahmed. B. Elhag, Babiker Karama
March 28, 2023
The efficiency of Azadirachta indica (neem leaves) on the removal of Pb(II) ions by adsorption from aqueous solution was investigated in this study. The efficiency of these leaves (without chemical or thermal treatment) for the adsorption of Pb(II) ions has not previously been reported. Batch experiments were performed to study the effect of the particle size, pH, adsorbent dose, contact time, initial Pb(II) ion concentration, and temperature. The maximum removal of 93.5% was achieved from an original Pb(II) ion solution concentration of 50 mg/L after 40 min, at pH 7, with 0.60 g of an adsorbent dose. The maximum adsorption capacity recorded was 39.7 mg/g. The adsorption process was also studied by examining Langmuir, Freundlich, Temkin isotherm, and Dubinin−Radushkevich (D-R) isotherm models. The results revealed that the adsorption system follows the pseudo-second-order model and fitted the Freundlich model. Several thermodynamic factors, namely, the standard free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes, were also calculated. The results demonstrated that the adsorption is a spontaneous, physical, and exothermic process. The surface area, pore size, and volume of adsorbent particles were measured and presented using a surface area analyzer (BET); the morphology was scanned and presented with the scanning electron microscope technique (SEM); and the functional groups were investigated using μ-FTIR.
Keywords
Azadirachta indica leaves, biosorption, isotherms, lead (II)
Subject
Suggested Citation
Elkhaleefa A, Ali IH, Brima EI, Shigidi I, Elhag AB, Karama B. Evaluation of the Adsorption Efficiency on the Removal of Lead(II) Ions from Aqueous Solutions Using Azadirachta indica Leaves as an Adsorbent. (2023). LAPSE:2023.24925
Author Affiliations
Elkhaleefa A: Department of Chemical Engineering, College of Engineering, King Khalid University, Abha 61413, Saudi Arabia; Department of Chemical Engineering and Chemical Technology, University of Gezira, Wadmedani 21113, Sudan [ORCID]
Ali IH: Department of Chemistry, College of Science, King Khalid University, Abha 61413, Saudi Arabia [ORCID]
Brima EI: Department of Chemistry, College of Science, King Khalid University, Abha 61413, Saudi Arabia; School of Allied Health Science, De Montfort University, The Gateway, Leicester LE1 9BH, UK
Shigidi I: Department of Chemical Engineering, College of Engineering, King Khalid University, Abha 61413, Saudi Arabia [ORCID]
Elhag AB: Department of Civil Engineering, College of Engineering, King Khalid University, Abha 61413, Saudi Arabia; Department of Geology, Faculty of Science, Kordofan University, Elobied 51111, Sudan
Karama B: Department of Chemical Engineering, Karary University, Khartoum 14411, Sudan
Journal Name
Processes
Volume
9
Issue
3
First Page
559
Year
2021
Publication Date
2021-03-23
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr9030559, Publication Type: Journal Article
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LAPSE:2023.24925
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doi:10.3390/pr9030559
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