| Autor: |
Egirani, Davidson E., Latif, Mohamed T., Poyi, Nanfe R., Wessey, Napoleon, Acharjee, Shukla |
| Předmět: |
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| Zdroj: |
Journal of Chemical Technology & Metallurgy; 2018, Vol. 53 Issue 5, p830-840, 11p |
| Abstrakt: |
This paper investigated the synthesis, characterization of CuO coated montmorillonite and its application in mercury ion removal. The synthesis involved trimetric process, while the characterization was carried out with the application of standard laboratory procedures. The mercury adsorption on ACOR CuO coated montmorillonite was investigated under batch mode conditions at an ambient temperature. The reaction mechanism indicated a proton coefficient less than one, a mass transfer rates similar to those of uncoated montmorillonite and an intraparticle diffusion of an intercept C equal to 366.43. The latter value was higher than that for uncoated montmorillonite. The adsorption properties including the mercury initial concentration, the particle concentration and the ageing effect differed when compared to those of uncoated montmorillonite. The reactions based on the metal initial concentration indicated that the active sites of ACOR CuO coated montmorillonite were not saturated. The reactions based on Cp solid concentration demonstrated a complex change of the quantity of adsorption decreasing initially to 0.008kg L-1 and then increasing to Cp. The specific surface area decrease, the particle size increase, the mineral aggregation and the concentration gradient controlled the complex adsorption changes. Based on pH variation, the differences in the magnitude and the characteristics of the adsorption capacity (715 mg kg-1 - 785 mg kg-1) were linked to the reactive support of CuO coating and the increased reorganization of the active sites controlled essentially by hydrolysis. This was explained with protonation decrease and hydroxylation increase with pH increase. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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