Biosorptive flotation of copper ions from dilute solution using BSA-coated bubbles. (1st May 2015)

• Record Type: Journal Article
• Authors: Nazari, Amir Mohammad; Cox, Philip W.; Waters, Kristian E.
• Is Part Of: Minerals engineering. Volume 75(2015)
• Page Start: 140
• Page End: 145
• Publication Date: 2015-05-01
• Subjects: Heavy metal removal -- Cysteine protein -- Sonochemistry -- Biosorption -- Separation -- Flotation; Mines and mineral resources -- Periodicals; Ressources minérales -- Périodiques; Mines and mineral resources; Periodicals; Electronic journals; 622
• DOI: 10.1016/j.mineng.2014.07.023
• Languages: English
• ISSNs: 0892-6875

Abstract

Highlights: Air filled emulsions used to remove metal ions from aqueous system. Flotation used to recover the metal-laden bubbles. Cationic flocculant used to increase buoyancy of bubbles. Abstract: Copper adsorption was carried out using the novel material known as air-filled emulsion (AFE). AFE is a stable colloidal system containing microscopic protein-coated bubbles (<10 μm) dispersed through an aqueous solution, resulting in an increased specific surface area and contact time between extractant and metal ions. Bovine serum albumen (BSA) generated emulsion concentration had a significant impact on copper removal, with maximum metal uptake obtained at 2.5 g/l of BSA-coated bubbles. It was shown that copper sorption was rapid over the first 10 min, and equilibrium conditions were reached within 40 min. Separation of the copper-loaded microcells from the aqueous solution was also investigated. Micro-flotation was employed to remove the microbubbles by means of attachment to the surface of larger air bubbles. In absence of a cationic surfactant, approximately 0.5% copper recovery was obtained at pH ranging from 5 to 8 due to the lack of hydrophobic groups on the surface of Cu-loaded BSA emulsions. Due to the fine sizes of the emulsion bubbles (<10 μm) a cationic flocculant was used to induce coagulation of the bubbles leading to easier phase separation. A combination of collector and flocculant at a concentration of 3 × 10 −4 M and 0.025 g/l, respectively, led to an increase in copper recovery to nearly 35% at pH 7.