Extraction study on recovery of nickel (II) from concentrated chloride medium with N,N′-bis(salicylaldeyde)ethylenediimine in the presence of CTAB and Brij^® 35 surfactants

Abstract

New extraction systems have been developed for recovery of nickel(II) from concentrated saline chloride medium (1 M) via the use of the chelating extractant, N,N′ Bis(salicylaldeyde) ethylenediimine (H₂SALEN), and different surfactants namely, cetyltrimethyl, ammonium, bromide (CTAB) and polyoxyethylene (23), dodecyl either (Brij^® 35).The effects of the main experimental parameters such as extraction time, pH, extractant concentration and surfactant concentration on the extraction process of nickel(II) with H₂SALEN alone and H₂SALEN-surfactant mixture at 30 °C were studied and compared. The findings of the examination revealed a good recovery (E = 70–80%) of nickel with H₂SALEN alone in various solvents (chloroform, toluene and methylisobutylketone) in the acidic pH range (4–5). The addition of both CTAB and Brij^® 35 to the aqueous phase resulted in a remarkable increase in the rate of nickel extraction by reducing the extraction time from 4 hours to 20–30 minutes. The stoichiometries of the extracted species and extraction constants were ascertained by slope analysis method. The surfactant-based extraction systems have shown high extractability and a fast separation of Ni (II) into chloroform than with the reported ones. The extraction mechanisms of nickel have been suggested.

Graphical Abstract

Keywords:

• Surfactant-based extraction systems
• nickel(II)
• chloride medium
• H2SALEN Schiff base
• CTAB
• Brij^® 35

Acknowledgment

The authors are thankful to « la Direction Générale de la Recherche Scientifique et du Développement Technologique d’Algérie » for sponsoring this work.