Article (Scientific journals)
Removal of metallic trace elements (Pb2+, Cd2+, Cu2+, and Ni2+) from aqueous solution by adsorption onto cerium oxide modified activated carbon
Kouotou, Daouda; Ghalit, Mohammed; Nsami Ndi, Julius et al.
2021In Environmental Monitoring and Assessment, 193 (193)
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Keywords :
removal of Pb2+, Cd2+, Ni2+, and Cu2+; kinetic studies; dsorption onto cerium; carbon
Abstract :
[en] The equilibrium and kinetic studies of removal of Pb2+, Cd2+, Ni2+, and Cu2+ metal ions were carried out using activated carbon prepared from palm kernel shell and doped with CeO2 (Ce/AC). The obtained material carbon was characterized by XRD which showed some crystalline traces of CeO2, SEM displaying the porous texture with spherical pores and the determination of pH of point of zero charge (pHPZC) which was found to be equal to 6. The contact time and adsorbate were thoroughly investigated. The maximum adsorption depends inversely on the hydrated metal radius. This observation was confirmed by calculating the formation energies (ΔH(M(OH)2)) of M(OH)2. The metal ionic radii were acting on calculated sorption capacity and that sorption efficiency related to ionic radii of metal was as follows: R(Ni2+) ≤ R(Cd2+) < R(Cu2+) < R(Pb2+). The texture and morphology of the material after sorption were affected by the metallic ion nature as observed by SEM. The kinetic studies showed that the rate constant (k2) of pseudo-second-order model decreased with the increase of the hydrated cations radii, while the rate constant of intraparticle diffusion increased with the increase of the ionic radii. The Freundlich isotherm model best fit the experimental sorption data for all the metallic ions.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Chemistry
Author, co-author :
Kouotou, Daouda
Ghalit, Mohammed
Nsami Ndi, Julius
Luisa M., Pastrana Martinez
El Ouahabi, Meriam  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Ketcha, Joseph Mbadcam
Gharibi, El Khadir
Language :
English
Title :
Removal of metallic trace elements (Pb2+, Cd2+, Cu2+, and Ni2+) from aqueous solution by adsorption onto cerium oxide modified activated carbon
Publication date :
05 July 2021
Journal title :
Environmental Monitoring and Assessment
ISSN :
0167-6369
eISSN :
1573-2959
Publisher :
Kluwer Academic Publishers, Netherlands
Volume :
193
Issue :
193
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 July 2021

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