Analysis of the efficiency of zinc sorption from aqueous solutions by nanocomposite based on graphene oxide and carbon nanotubes
Abstract
A modern approach to the solution of the problems of environmental safety of water bodies is the application of liquid-phase sorption methods based on the use of new types of complex nanostructured adsorbents. Carbon nanomaterials and their modified forms, which have unique physical, chemical and operational characteristics, provide the highest efficiency in water treatment. At the same time, nanomaterials can ensure the extraction of several types of pollutants, both organic and inorganic. This advantage is achieved due to the synergistic effect - the developed specific surface of nanosorbents along with the possibility of chemical modification of the surface and grafting a wide range of active functional groups. In this work, kinetic sorption studies of the extraction of Zn (II) zinc ions by synthesized nanocomposites were carried out. These materials are sorbents based on reduced graphene oxide and oxidized carbon nanotubes modified with a functional organic component, polyaniline, and phenol-formaldehyde resin. The influence of regime parameters of obtaining nanocomposites (carbonization, drying method) on their sorption capacity was evaluated. Studies were carried out for the aerogel materials, as well as for carbonized aerogel and cryogel. The adsorption kinetics was described using the following empirical models: pseudo-first order, pseudo-second order models, Elovich model. The mechanism of zinc adsorption on the obtained materials was studied using diffusion Weber-Morris (intraparticle diffusion) and Boyd (film diffusion) models. The results of the experiments showed that in the first 10 minutes the adsorption capacity of the aerogel, carbonized aerogel and carbonized cryogel was reached – 200, 110, and 178 mg/g, respectively. It has been established that the absorption is carried out according to the mixed-diffusion mechanism with the contribution of the chemical interaction between the metal ion and the functional groups of the sorbent.
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