Characterization of Akilbenza clay from Cameroon and its performance for the removal of copper(II) ions from aqueous sol
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RESEARCH ARTICLE
Characterization of Akilbenza clay from Cameroon and its performance for the removal of copper(II) ions from aqueous solution Ernest Kentsa 1 & Charles Fon Abi 2 & Horace Manga Ngomo 1 Joseph Ketcha Mbadcam 1
&
Julius Nsami Ndi 1,2,3 & Sary Awad 3 &
Received: 13 June 2019 / Accepted: 28 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Akilbenza clay (Akil) was characterized by XRD, FT-TIR, XRF, EDX, SEM, and N2 gas adsorption. The adsorption performance for Cu(II) ions by this clay was also studied. Akil is composed mainly of kaolinite with mica illite and quartz as minor minerals. The ATR-FTIR analysis shows Si-O-Al, Si-O, Al-O, Si-OH, and Al-OH as the main functional groups. SEM indicates that the clay particles are irregular in shape and size by supported BJH. Akil has a specific surface area of 45.62 m2/g with the presence of both mesopores and micropores. The average pore diameter is 19.4196 nm. XRF and EDX reveal that the clay is mainly composed of silica, aluminum, and iron with a Si/Al ratio of 1.41. For the adsorption performance of Cu(II) ions, a maximum quantity of 76 mg/g was recorded. Freundlich isotherm models best describe the adsorption processes at equilibrium. Kinetic studies revealed that the adsorption process was well explained with pseudo-second-order kinetic model. The value of the mean energy of adsorption from Temkin isotherm and the values from Elovich kinetic model suggest that the adsorption of Copper(II) ions on Akil is a combination between ion exchange and electrostatic attraction. The results obtained can be introduced into the database of knowledge on clay minerals with emphasis on their use for the removal of Cu(II) ions. Keywords Adsorption . Chemisorption . Akilbenza clay . Cu(II) ions . Kaolinite
Introduction Nowadays, natural clay minerals have been the subject of many research studies because of their wide industrial applications. This is justified by their natural abundance in most continents of the world and at low cost, their high sorption properties and potential for ion exchange (Eloussaief et al. 2011). There are many types of clay material such as montmonllorinite, kaolinite, smectite, serpentite, vermiculite, Responsible editor: Tito Roberto Cadaval Jr * Horace Manga Ngomo [email protected] 1
Laboratory of Applied Physical and Chemistry Laboratory, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
2
Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, P. O. Box 47, Yaoundé, Cameroon
3
GEPEA, UMR 6144, DSEE, IMT-Atlantique, 44307 Nantes, France
and sepiolite (Dordio et al. 2017). These clays are produced by the decomposition of rock minerals (Zhou et al. 2018). The type of clay obtained depends on the mineral composition of the rock and the soil (Jordanova et al. 2003). Therefore, any survey of clay deposits and determination of clay properties is specific to that clay deposit. Hence, the valorization of clay from any area for industrial applications oft
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