Separation by Flotation

Flotation-separation of toxic metal ions from aqueous solutions using thiosemicarbazide derivatives as chelating agents and oleic acid as a surfactant

“…Therefore, 25˚C is common between the four ligands and was used throughout. The decrease in separation upon raising the temperature may be due to the increase in the solubility of the precipitate and the instability of the foam giving rise to partial dissolution of the precipitate and insufficient foam consistency to hold up the precipitate [27]. Since this parameter has an important and variable influence on the flotation process, it is very interesting to study each particular case, especially for large temperature variations [50].…”

“…Although some work has been carried out for the flotation of Hg 2+ [8,10,14,[22][23][24][25][26][27][28]; Cd 2+ [8,10,[29][30][31][32][33][34][35][36][37] and Mn 2+ [17,32,[38][39][40][41][42][43] from aqueous solutions, wastes and natural waters, no attention has been paid towards the use of thiosemicarbazide derivatives in this respect. Therefore, the objective of the present work was to extend the application of flotation technique to separate Hg 2+ , Cd 2+ and Mn 2+ ions from aqueous solutions using (H2PPS), (H2PBO), (H2APO), (H2PPY) and oleic acid surfactant (HOL) under the recommended conditions.…”

A mathematical model and mechanism of sublation of dye-surfactant ion complexes

“…Most of these studies have focused on the removal of organic pollutants from aqueous systems, such as alkyl phthalate, volatile chlorinated organics, dichlorobenzenes, nitrophenols, polynuclear aromatics and chlorinated pesticides [5,6,7,8,9,10,11], and the emission of volatile organic compounds (volatile chlorinated organics and toluene) to the atmosphere in the solvent sublation [12,13]. Other studies concern the solvent sublation of dyes in aqueous solution, such as the separation of methyl orange from rhodamine B [14,15], the solvent sublation of bromophenol blue-hexadecyl pyridium chloride ion pair [16], magaenta (a cationic dye) with sodium lauryl sulfate [17] and direct red and acid red (two anionic dyes) with hexadecyltrimethylammonium ions [18,19].…”

Spectrophotometric and atomic absorption determination of Ni(II) in fresh and sea waters after preconcentration by flotation

“…The use of flotation techniques [2] have proved to be of great utility [3,4] in the preconcentration of trace elements in natural waters [5][6][7], waste [5,8] and marine waters [9,10].…”