Kinetic studies of adsorption of palmitate and laurate soaps onto some metal ores in aqueous media

International Journal of Physical Sciences

Millicent U. Ibezim-Ezeani¹ 

关键词: Kinetics;    adsorption;    soap;    collector reagent;    pseudo-first order.;   

DOI  :  

学科分类：物理（综合）

来源: Academic Journals

【 摘 要 】

The kinetics of adsorption of sodium-palmitate and sodium-laurate onto galena, hematite and cassiterite in aqueous media was investigated at various concentrations, times and temperatures. Experimental results were analysed using the pseudo-first and pseudo-second order kinetic models. The pseudo-first order model with higher correlation coefficient values described the adsorption kinetics better than the pseudo-second order model. The rate constant from the pseudo-first order model [0.109 min-1for galena, 0.102 min-1for hematite, 0.085 min-1for cassiterite (in the sodium-palmitate adsorption) and 0.127 min-1for galena, 0.109 min-1for hematite, 0.095 min-1for cassiterite (in the sodium-laurate adsorption) at 29oC] show these rates in the order: galena > hematite > cassiterite for the adsorbents; and sodium-laurate > sodium-palmitate for the adsorbates. Some kinetic parameters were computed and the values obtained indicate that the adsorption processes occurred at reasonable rate, low temperature and low energy suggesting physical adsorption as the dominant process.

【 授权许可】

CC BY