| Summary: | The study that aimed to determine the ability of Pseudomonas aeruginosa
immobilized on Ca-alginate material (PAI) for Zn2+ ions adsorption has been
done. The effect of pH on Zn2+ ions adsorption by Pseudomonas aeruginosa (PA) and Pseudomonas aeruginosa immobilized on Ca-alginate (PAI), kinetics and adsorption capacity of Zn2+ ions adsorption by PA and PAI, the interaction model that occurs in Zn2+ ions adsorption by PAI and the effect of Cu2+ ions addition to the Zn2+ ions adsorption by PA were also evaluated.
The IR data showed that PA was immobilized on Ca-alginate material
through cross-linking. The optimum pH for adsorption of Zn2+ ions by PA and
PAI was 4.5, contact time 270 minutes, the adsorption capacity of PA and PAI
were 107,89 and 297,85 mol/g respectively. The reaction kinetics of Zn2+ ions
adsorption by PA followed the reaction mechanism of pseudo-second order
reaction and adsorption isotherm models of Zn2+ ions adsorption by PA followed Freundlich isotherm model with adsorption energy 11,87 kJ/mol, while the reaction kinetics of Zn2+ ions adsorption by PAI followed first-order reaction mechanism and isotherm models of Zn2+ ions adsorption by PAI followed Freundlich isotherm model with adsorption energy 14,45 kJ/mol. The model of interaction between Zn2+ ions and the active side of PAI adsorbent is ion exchange interaction, as proved by the result of desorption that 100% by HNO3 solution. Adsorption of Zn2+ ion by PA was not influenced by the presence of Cu2+ ions. It is believed that the adsorption of Zn2+ and Cu2+ ions by PA use different binding site.
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