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Removal of chromium(VI) from aqueous solution using manganese oxide nanofibers
Abdullah H. Qusti 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Manganese oxide nanofibers (MONFs) were synthesized, characterized, and successfully used for the removal of the toxic Cr(VI) ions from a model and the real solution. The results showed that the MONFs were fibers, whose shape consisted of an average diameter of 10 nm to 16 nm and a specific surface area equal to 94.1 m2 g-1, that was mainly composed of crystalline a-MnO2 (i.e., as was confirmed with the XRD measurement). The effect of different parameters that affected the adsorption process was studied and optimized. The results showed an efficient removal at pH 2.0, within 60 min, and by using 150 mg MONFs at the ambient temperature. The adsorption of Cr(VI) ions from an aqueous solution was studied kinetically at different temperatures. The results showed that the removal process followed the pseudosecond-order model, with an adsorption capacity of 14.6 mg g-1 at ambient temperature. The thermodynamic parameters were calculated and the results showed that the adsorption of Cr(VI) ions from aqueous solution by MONFs is physical, spontaneous, and exothermic (△H = 39.3 kJ mol-1) in nature, with negative entropy. Finally, MONFs were used for the removal of Cr(VI) ions from a real sample, and the result indicated that the MONFs are highly efficient at removing the toxic Cr(VI) ions.
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Low dimensional Ni-ZnO nanoparticles as marker of toxic lead ions for environmental remediation
Mohammed M. Rahman,Sher Bahadar Khan,Hadi M. Marwani,Abdullah M. Asiri,Khalid A. Alamry,Malik Abdul Rub,Anish Khan,Aftab Aslam Parwaz Khan,Abdullah H. Qusti 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
We have synthesized Ni-ZnO nanoparticles (NPs) by a wet-chemical route using reducing agents. Thestructural and optical properties of Ni-ZnO NPs were investigated by various conventional methods. Theanalytical potential of the Ni-ZnO NPs was studied for a selective detection of toxic Pb(II) ion usingrecognized ICP-OES method for environmental remediation. Data obtained from the selectivity studyindicated that the selectivity of Ni-ZnO NPs phase was the most toward Pb(II) ion. However, theadsorption isotherm data of Pb(II) on Ni-ZnO NPs phase was good-match with the Langmuir-Adsorption-Isotherm, strongly supporting that the adsorption process was mainly monolayer on homogeneousadsorbent surfaces.
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