In the presented paper the use of a novel environmentally friendly aminopolycarboxylate chelating agent trisodium salt of methylglycinediacetic acid (MGDA) to inactivate various metal ions by complex formation in microporous anion exchangers and sorbents was tested. MGDA is a new generation of chelator, undergoing biodegradation. The removal of Cu(II) and Ni(II) ions from aqueous solutions in the presence of MGDA on microporous anion exchangers of the Lewatit group with different basicity of functional centres as well as on nitrolite and clinoptilolite was described. The studies were carried out by the dynamic (column) and the static (batch) methods. The influence of several parameters such as the concentration of analyzed metal ions, pH and temperature were studied with respect to sorption equilibrium. The sorption isotherms were obtained and fitted using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) models. Kinetic curves were also fitted using pseudo first order, pseudo second order as well as the intraparticle diffusion model equations to evaluate the most effective one. [...]
Application of Micellar enhanced ultrafiltration (MEUF) for the removal of different heavy metals has been reviewed. It is considered an economical alternative available to the conventional membrane separation process, because it reduces the requirement of higher pressure and high membrane costs. MEUF is a separation processes which uses surfactants and ultrafiltration membranes to remove multivalent ions from wastewater with high percent rejection using electrostatic attraction between metals and micelles. This review seeks to define the effect of the operating parameters, i.e., applied pressure, surfactant concentration, feed temperature, metal ion concentration, feed flow rate, operating time etc. on the removal of metal ions. Emphasis is given to the application of MEUF for the removal of single metal ions, multiple metal ions and different metals along with other organic materials. Also, this review focuses on studies related to micelle formation, attraction between metal ions and micelles, and recovery of surfactants for future research.
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