Photocatalytic properties of nanosized zinc ferrite and zinc chromite

Abstract

A simple one-step synthesis of developed surface zinc ferrite is proposed (S BET = 453.1 m2 g−1). The formation of zinc ferrite, zinc chromite (S BET = 53.6 m2 g−1), and mixed zinc ferrite-chromite (S BET = 37.4 m2 g−1) structures is studied. The resulting materials are analysed using x-ray phase and x-ray fluorescence analysis, IR spectrometry, electron microscopy, TGA and BET method. Single-phase sample formation mechanism is proposed, which includes transition element cation chelate complex formation stage in the presence of citric acid and subsequent thermal decomposition of the complexes formed. The synthesised materials exhibited photocatalytic activity in the decomposition of an organic dye under the action of hydrogen peroxide. The highest catalytic activity is demonstrated by zinc ferrite in acidic medium; the calculated reaction rate constant is 0.010 min−1 for ZnFe2O4, 0.008 min−1 for ZnFeCrO4, 0.007 min−1 for ZnCr2O4. The results can be applied to obtain materials suitable for wastewater treatment processes at industrial enterprises where organic dyes are used in production cycles.

The effect of vanadium addition in Ni1-xVxFe2O4 nano photocatalysts on remazol golden yellow degradation under visible light irradiation

“…When viewed from the BET surface area data as shown in table 4 below, it appears that the photocatalytic activity increases with increasing vanadium dopant. However, the surface area decreases, in contrast to the general assumption on catalytic activity [52][53][54][55]. Suppose we look more closely, to the average pore size of the catalyst, Ni 0.7 V 0.3 Fe 2 O 4 has a relatively larger pore size even though the BET surface area is smaller than other catalysts as shown in table 4.…”

Study of the Possibility of Using Sol–Gel Technology to Obtain Magnetic Nanoparticles Based on Transition Metal Ferrites

“…Cobalt (II) ferrite and composite materials synthesis was carried out in one stage with the formation of CoF 2 O 4 and an in situ organic–inorganic composition. The formation of cobalt (II) ferrite on the surface of a carbon-containing substance was carried out according to the method developed by the authors and described in [ 17 , 18 ]. In a typical procedure, 25 mmol of Co(NO 3 ) 2 and 50 mmol of Fe(NO 3 ) 3 were simultaneously placed in a stainless-steel reaction vessel under continuous stirring.…”

Environmentally safe synthesis of complex aluminum-vanadium oxides

“…To obtain complex oxide materials, original synthetic methods were used, described by the authors in [14]. For this, crystalline ammonium metavanadate NH 4 VO 3 was dissolved in distilled water in an amount of 35.1 g per liter.…”