Adsorption capacity and mineralogical and physico-chemical characteristics of Shuwaymiyah palygorskite (Oman) |
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| Authors: | Ahmed Al-Futaisi Ahmad Jamrah Amer Al-Rawas Saif Al-Hanai |
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| Institution: | (1) Department of Civil and Architectural Engineering, Sultan Qaboos University, P.O. Box 33, Al-Khoudh, 123, Oman |
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| Abstract: | In this paper, Shuwaymiyah palygorskite in the Sultanate of Oman has been characterized mineralogically by X-ray diffraction
(XRD) and electron microscopy, chemically by oxide compositions, structural formulae, and cation exchange capacity (CEC),
and physically by specific surface area and adsorption isotherms. Batch adsorption studies were performed to evaluate the
adsorption performance of methylene blue (MB) basic dye on the local clay mineral. The quantitative XRD analysis indicates
that the purity of some selected samples of palygorskite clay is very high (about 70% of the clay minerals are palygorskite
and 30% kaolinite). The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images clearly support
this conclusion. The adsorption equilibrium revealed that Shuwaymiyah palygorskite clay can uptake up to 51 mg of MB per 1 g
mass of clay. MB adsorption is best fitted by Langmuir isotherm, and a pseudo-second-order kinetic model can be efficiently
used to predict the kinetic of adsorption of MB by the palygorskite. The results obtained from these laboratory-scale adsorption
tests indicate the promising adsorption capability of the Omani palygorskite. |
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| Keywords: | Adsorption Palygorskite Methylene blue Physio-chemical characterization |
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