Effects of urotropin on the formation of β-FeOOH

Synthesis and Catalytic Properties of Iron Oxides in the Reaction of Low-Temperature Ozone Decomposition

“…As calcination temperature increases, the contents of α-Fe 2 O 3 and γ-Fe 2 O 3 phases also increase, whereas the contents of The noted above temperature-related decrease in Fe 3 O 4 phase content and increase in γ-Fe 2 O 3 phase content lead to maximal γ-Fe 2 O 3 presence in the IS-300 sample compared with other IS samples. This confirms the well-known [9,10,22,23] phase transformation chain realized as a result of temperature increase…”

“…In particular, Fe 3 O 4 , γ-and α-Fe 2 O 3 , as well as α-and β-FeO(OH) are used as catalysts in the case of oxidation of organic compounds with ozone [2][3][4][5][6] and hydrogen peroxide [7,8]. Phase compositions of catalysts based on iron oxides depend on an iron salt concentration, the nature of anion and precipitating agent, temperature and duration of hydrolysis, as well as on conditions of drying and calcination of solid precipitates [1,[9][10][11]. Catalytic properties of the iron oxide forms with homogeneous phase compositions substantially depend on the nature of surface groups and their ratios [2,3,12], their specific surface, sizes, and shapes of nanoparticles [1,13].…”

Iron Oxide Nanoparticles

“…In recent years, nanosized and nanostructures of super-paramagnetic iron oxides have been investigated extensively because of their wide applications in nano-fields such as ferrofluids (Raj et al, 1995), magnetocaloric refrigeration (McMichael et al, 1992), biotechnology, and in vivo bio-medical field . These materials offer several potential biomaterial as well as biomedical (Rahman et al, 2009) applications in magnetically controlled drug delivery, magnetic resonance imaging as contrast agent, tissue repair, and detoxification of biological fluids (Garcia et al, 2004;Music et al, 1997). It has been extensively studied in diverse fields including catalysis (Brown et al, 1998) environment protection (Chen et al, 2005), magnetic storage media (Zeng et al, 2002), clinical diagnosis, and treatment (Jordan et al, 2003).…”

Crystal splitting in the growth of β-FeO(OH)

“…Up to now, b-FeO(OH) with cigar-type [10], rodlike, needle shapes [11], X-shapes, Y-shapes, and star shapes [12] was prepared from the hydrolysis of FeCl 3 solutions. Furthermore, b-FeO(OH) was always observed as a precursor of a-Fe 2 O 3 particles and formation mechanism of a-Fe 2 O 3 particles from b-FeO(OH) has already proposed [13].…”