Magnetic sorbents based on hypercrosslinked copolymers of styrene anddivinylbenzene with immobilized iron oxides

Pastukhov, A.V.

Автор: Pastukhov Alexander V.
Журнал: Reactive and Functional Polymers
Год издания: 2021
Издательство: Elsevier BV
Местоположение издательства: Netherlands
DOI: 10.1016/j.reactfunctpolym.2021.104823
Аннотация: Magnetic sorbents were obtained by the immobilization of iron oxides into the pores of hypercrosslinked polystyrenesorbents via chemical precipitation. Various types of industrial Macronet and Amberlite adsorbents andthe synthesized hypercrosslinked styrene-divinylbenzene copolymer were used as a porous polymer matrix. Thevolume fraction of the inorganic phase in the composites was 2.2–8.3 vol%. According to X-ray phase analysis andtransmission electron microscopy, the inorganic phase in the sorbents was magnetite and the size of magnetitenanocrystallites was 3–16 nm. The structural studies of the composite sorbents by scanning electron microscopy/energy-dispersive X-ray spectrometry demonstrated a uniform distribution of nanodispersed iron oxides over thevolume of sorbent granules. Investigation of the porous structure of magnetic sorbents by the low-temperature nitrogensorption showed that the composites have a well-developed system of pores with a specific pore area of upto 1400 m2 g−1 and the volume of micropores (<3 nm) up to 0.6 cm3 g−1. The sorbent porosity parameters werecalculated using methods based on the capillary condensation theory and the quenched solid density functionaltheory. Analysis of pore size distributions revealed that several specific pore “fractions” are present in the poroussystem of the magnetic sorbents. Micropores up to 2.5 nm in size were characteristic of all the studied sorbents;for some sorbent types, two to three additional “fractions” of mesopores up to 10 nm in size and macropores withsizes above 50 nm were detected. In the magnetic sorbents, the total pore volume was 0.4–1.0 cm3 g−1 and themesopore volume was 0.2–0.6 cm3 g−1. It was found that the magnetic sorbents can adsorb toxic organic compoundsof various classes: alcohols, ethers, and aliphatic, aromatic, and chlorine-containing hydrocarbons (from0.4 to 1.0 mL cm−3). The obtained composite sorbents show promise for the purification of liquid, gaseous, andsolid media by the magnetic separation method.
Добавил в систему: Пастухов Александр Валерианович

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Magnetic sorbents based on hypercrosslinked copolymers of styrene anddivinylbenzene with immobilized iron oxidesстатья

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