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Rafie SF, Abdollahi H, Sayahi H, Ardejani FD, Aghapoor K, Karimi Darvanjooghi MH, Kaur Brar S, Magdouli S. Genetic algorithm-assisted artificial neural network modelling for remediation and recovery of Pb (II) and Cr(VI) by manganese and cobalt spinel ferrite super nanoadsorbent. CHEMOSPHERE 2023; 321:138162. [PMID: 36804494 DOI: 10.1016/j.chemosphere.2023.138162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 02/11/2023] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
MnFe2O4 and CoFe2O4 nanoparticles were hydrothermally synthesized to examine their capability in adsorption of Pb (II) and Cr (VI). The adsorbents exhibited a high rate of adsorption, reaching 90% of their adsorption capacity in less than 30 min. Furthermore, the adsorption capability of the Magnetic Nanoparticles (MNPs) was noticeably greater at initial pollutant concentrations smaller than 40 mg/L. Maximum adsorption capacity on MnFe2O4 and CoFe2O4 nanoparticles were 40 and 25.38 mg/g for Cr (VI) and 523.32 and 476.19 mg/g for Pb (II), respectively. A data-driven model of Artificial Neural Network was used for prediction of adsorption capacity at both equilibrium and non-equilibrium condition. The model parameters including the numbers of neuron (n = 7) and data portioning for training (49.5%), validation (40.5%), and testing (10%) were obtained using Genetic Algorithm. The results indicated that the model could predict the data with high accuracy (R2 = 0.998). The input parameters were initial concentration, time, pH, temperature, adsorbent dosage, and other parameters that is dependent to the physico-chemical properties of ions and adsorbents' surface (ε, α1, α2). The mechanism involved in Cr(VI) and Pb(II) adsorption are electrostatic physisorption and a combination of ion exchange chemisorption and electrostatic physisorption, respectively. Desorption capability and adsorbent reuse capability were also examined.
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Affiliation(s)
- Seyed Faridedin Rafie
- School of Mining Engineering, College of Engineering, University of Tehran, Tehran, 1439957131, Iran
| | - Hadi Abdollahi
- School of Mining Engineering, College of Engineering, University of Tehran, Tehran, 1439957131, Iran
| | - Hani Sayahi
- Chemistry and Chemical Engineering Research Center of Iran, Tehran, 1496813151, Iran
| | - Faramarz Doulati Ardejani
- School of Mining Engineering, College of Engineering, University of Tehran, Tehran, 1439957131, Iran
| | - Kioumars Aghapoor
- Chemistry and Chemical Engineering Research Center of Iran, Tehran, 1496813151, Iran
| | | | - Satinder Kaur Brar
- Department of Civil Engineering, Lassonde School of Engineering, York University, North York, Toronto, Ontario, M3J 1P3, Canada.
| | - Sara Magdouli
- Department of Civil Engineering, Lassonde School of Engineering, York University, North York, Toronto, Ontario, M3J 1P3, Canada
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Development and characterization of electrochemical sensors based on carbon modified with TiO2 nanoparticles. HEMIJSKA INDUSTRIJA 2022. [DOI: 10.2298/hemind220105013m] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study is the development and characterization of a
carbon-based electrochemical sensor, modified with TiO2 nanoparticles for
potential application in electroanalytical techniques. The influence of
binder and modifier contents on morphological, physicochemical and
electrochemical characteristics of the electrode material was investigated
in order to determine the optimal ratio of the carbon
material/binder/modifier. Carbon pastes were prepared from mixtures
containing graphite powder, TiO2 nanoparticles and liquid hydrocarbons.
Scanning electron microscopy showed that the electrode material becomes more
compact with the addition and the increase in the binder material content,
while increasing the proportion of TiO2 nanoparticles did not have any
significant effect on the material morphology showing fairly homogeneous
nanoparticle distribution in the graphite electrode material. The test
results indicate that the modified carbon paste with 40 vol.% paraffin oil
(PO) and 6-8 wt.% TiO2 nanoparticles is characterized by the lowest value of
specific resistance. By applying cyclic voltammetry, the most pronounced
degree of reversibility was obtained in relation to the standard reversible
redox system ([Fe (CN)]-3/-4) for the electrode material with 30-40 vol.% PO
and 8-10 wt.% TiO2 nanoparticles. Characterization of the electrode material
based on carbon modified with TiO2 nanoparticles indicated that the optimal
composition contains 40 vol.% PO and 6-8 wt.% TiO2 nanoparticles, which is
important for application in electroanalytical techniques.
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Hassan MH, Khan R, Andreescu S. Advances in electrochemical detection methods for measuring contaminants of emerging concerns. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100184] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Mohamed H. Hassan
- Department of Chemistry and Biomolecular Science Clarkson University Potsdam New York USA
| | - Reem Khan
- Department of Chemistry and Biomolecular Science Clarkson University Potsdam New York USA
| | - Silvana Andreescu
- Department of Chemistry and Biomolecular Science Clarkson University Potsdam New York USA
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