Removal of Nickel by Means of Micellar-Enhanced Ultrafiltration (MEUF) Using Two Anionic Surfactants

Abstract

Micellar-enhanced ultrafiltration (MEUF) is an effective separation technique for removing metal ions from aqueous environments. The critical micellar concentration (CMC) of two anionic surfactants, sodium dodecyl sulfate (SDS) and linear alkylbenzene sulfonate (LAS), was determined by means of conductometry. The effects of pH, conductivity, and surfactant concentration on the permeate flow, retention of surfactants and nickel by MEUF, was studied. Results showed that for surfactant concentrations beyond the CMC, Ni(II) retention with SDS was slightly higher than with LAS (S/M=45: Ni(II) retention was 70% and 55% for SDS and LAS, respectively). LAS surfactant was always retained in higher quantities than SDS. An increase in conductivity produced large reduction in Ni(II) retention and slightly increased surfactant retention. pH values between 4 and 8 did not affect nickel retention but enhanced the SDS and LAS surfactant retentions.

Purification of Raw Cane Sugar by Micellar-Enhanced Ultrafiltration Process Using Linear Alkylbenzene Sulphonate

“…Some of the physicochemical properties of this anionic surfactant are listed in Table (Samper et al . ; Kowalska ).…”

Optical Sensing of Copper and Its Removal by Different Environmental Technologies

“…Sodium dodecyl sulfate is found as the effective anionic surfactant for the removal of copper and nickel. Higher removal of copper and (or) nickel were observed in water medium and phosphorous rich synthetic water . Anthati and Marathe demonstrated that copper can be removed effectively by continuous cross‐flow micellar‐enhanced ultrafiltration using iminodiacetic acid (chelating agent) and sodium dodecyl sulfate (anionic surfactant).…”

Micellar enhanced ultrafiltration (MEUF) of metal cations with oleylethoxycarboxylate

“…With increasing pH, the degree of dissociation of RO90 increases (pK A ¼ 4.6) and more carboxy groups become available to bind the Ni 2 þ ions, resulting in a higher metal ion removal efficiency in MEUF. In this contribution we used a pH of 6.5, because this pH was already used in our previous investigation for Cu 2 þ removal [18] and too high pH may lead to precipitation of the metal ions in form of oxides, hydroxides, or oxohydroxides, as mentioned by Samper et al [25]. To estimate how much surfactant is needed to remove the Ni 2 þ ions, we varied the ratio of surfactant to Ni 2 þ (the RO90 concentration was kept constant at 100 cmc).…”