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RESEARCH PROCESSES OF ION EXCHANGE REMOVAL PHOSPHATES »« THE REMOVAL OF INDIGO CARMINE FROM WATER BY SOLVENT SUBLATION

THE REMOVAL OF HEAVY METAL (NICKEL) IONS FROM WASTE WATERS

UDC 622.765:542.61:546.571

T. Obushenko, N. Tolstopalova, O. Bolielyi

National Technical University of Ukraine «Igor Sikorsky Polytechnic Institute», Kiev, Ukraine

e-mail: tio63@mail.ru

Solvent sublation is a combined method that includes advantages of ionic flotation and liquid extraction. This is a process in which flotation product (sublate) concentrates in a thin layer of organic liquid, which is located on the surface of aqueous phase. There are only a few scattered and unsystematic researches of solvent sublation for water treatment from heavy metal ions. However, such feature of solvent sublation as possibility of metal ions concentration in little volumes of organic solvent independently from distribution coefficient indicates perspective of this method for the treatment of waste waters polluted by heavy metals with the opportunity of metal regeneration. Solvent sublation of nickel ions from low concentrated (20 mg/dm3) aqueous solutions with the use of sodium dodecylsulphate as anionic surfactant was studied. It was discovered, that branched alcohols are better at retention of sublate than those unbranched. Thus, isoamyl alcohol is more effective for solvent sublation than pentanol. Dependences of removal ratio on pH of environment, on molar ratio of Ni2+ : surfactant were researched. The required volume of organic phase was determined. The research of nickel ions removal by solvent sublation from model solutions allowed to determine rational conditions of the process: pH 9, molar ratio of Ni2+ : surfactant = 1 : 2, volume of organic phase 5 cm3. Under these conditions removal ratio of nickel ions into isoamyl alcohol is 95,8%.

Keywords: nickel, solvent sublation, removal ratio, sodium dodecylsulphate, sublat.

Cite this article as: Obushenko, T., Tolstopalova, N., Bolielyi, O. WPT STN (2017) 21:24. | Download (PDF)

06.07.2017 at 8:10 pm