6 Nanocomposites and nanomaterials

Synthesis and study of diatomite/alginate/Fe3O4 composite polymer material

L. Frolova, O. Pasenko

Department of Technology Inorganic Materials and Ecology, 
Ukrainian State University of Chemical Technology, ave Gagarina, 8, Dnipro-49005, Ukraine.
Email: 19kozak83@gmail.com

The synthesis of deposited composite granules of diatomite-alginate and diatomite-alginate-Fe3O4 composite granules is proposed. Technological approaches to the use of diatomaceous earth as a raw material for the creation of composite adsorbents for wastewater treatment of cations and anions are analyzed. It is shown that the developed surface of diatomaceous earth can be used to create a granular adsorbent, and iron (II, III) oxide is an environmentally friendly, cheap, economically feasible modifier.
The influence of synthesis conditions (initial concentration of sodium alginate, nozzle diameter, solid phase content) and granulation of alginate-diatomite-magnetite composite adsorbent on its physicochemical properties is established. The process of applying the active magnetic phase of the adsorbent is studied. Granular composite adsorbents (alginate-bentonite-Fe3O4) were characterized by scanning microscopy, SEM-EDX elemental analysis, FTIR spectroscopy, X-ray phase analysis, UV spectroscopy, derivatography.
The conditions for the formation of spherical diatomite granules in the presence of sodium alginate C [CaCl2] = 0.024 mol / L, ω (diatomite) = 5 - 20% were established.
Spherical granules of adsorbents using Fe3O4 as the active adsorption layer were obtained. It is established that the static strength of the obtained adsorbent granules is 17 - 25 kPa. The dependence of the static strength of granules on the solid phase content (17 - 25 kPa) is established. The thermal stability of the samples was studied, it was found that increasing the solid phase content improves the thermal stability. Polymeric granular adsorbents are obtained from diatomaceous earth and calcium alginate.