Laboratory of Applied Physical and Chemistry Laboratory, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon.
Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, P. O. Box 47, Yaoundé, Cameroon.
Environ Sci Pollut Res Int. 2020 Oct;27(29):36487-36497. doi: 10.1007/s11356-020-09502-9. Epub 2020 Jun 19.
Akilbenza clay (Akil) was characterized by XRD, FT-TIR, XRF, EDX, SEM, and N 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 m/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.
埃基尔本扎粘土（Akil）通过 XRD、FT-TIR、XRF、EDX、SEM 和 N 气体吸附进行了表征。还研究了该粘土对 Cu(II)离子的吸附性能。Akil 主要由高岭石组成，云母伊利石和石英为次要矿物。ATR-FTIR 分析表明，Si-O-Al、Si-O、Al-O、Si-OH 和 Al-OH 是主要的官能团。SEM 表明，BJH 支持的粘土颗粒形状和大小不规则。Akil 的比表面积为 45.62 m/g，存在中孔和微孔。平均孔径为 19.4196nm。XRF 和 EDX 表明，粘土主要由硅、铝和铁组成，Si/Al 比为 1.41。对于 Cu(II)离子的吸附性能，记录到最大吸附量为 76mg/g。Freundlich 等温模型最能描述平衡时的吸附过程。动力学研究表明，吸附过程很好地用拟二级动力学模型解释。Temkin 等温线的平均吸附能值和 Elovich 动力学模型的值表明，Cu(II)离子在 Akil 上的吸附是离子交换和静电吸引的结合。所得结果可引入粘土矿物知识库，重点是它们在去除 Cu(II)离子方面的应用。
