Template-Free Synthesis and Photocatalytic Properties of Novel Fe₂O₃ Hollow Spheres

Abstract

Novel Fe2O3 hollow spheres with mesopores on the surface were first synthesized on a large scale by a facile and efficient hydrothermal process, without templates in the system. The samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N2 adsorption−desorption. When the amorphous Fe2O3 hollow spheres were used as the photocatalytic material, they performed better than the nanocrystal samples. This synthetic procedure is straightforward and thus facilitates mass production of Fe2O3 hollow spheres.

Hollow, Branched and Multifunctional Nanoparticles: Synthesis, Properties and Applications

“…6,31,58,73,74,79,80 Pores present on the shell allow efficient mass-transfer of species into the cavity and thus their access to both the inner and outer surface of the hollow nanoparticles. Liang and co-workers reported that the catalytic activity of Pt hollow nanospheres in the room temperature oxidation of methanol is twice that of the solid Pt nanoparticles (Fig.…”

“…Several types of reactions including crosscouplings, oxidations and hydrogenations have been conducted using hollow nanosphere or nanocage based catalysts. 6,31,34,58,73,74,79,80,[90][91][92][93] Suzuki reaction couples arylboronic acids and aryl halides to form biaryls, which Pd nanoparticles have been most commonly used to catalyze. Table 1 summarizes the yield of Suzuki reactions of various aryliodides (or arylbromides) and phenylboronic acid when hollow Pd spheres are used as a catalyst.…”

“…80,90 As another example, photocatalytic degradation of organics has been carried out using NiO, Fe 2 O 3 , Pt-ZnO and Au-ZnO hollow nanoparticles. 34,54,73 Hydrogenation reactions are one of the most common reactions catalyzed by transition metal nanoparticles. Pt or Rh nanoparticles incorporated in hollow carbon nanospheres have recently been used to catalyze the hydrogenation of 1-hexene, 2-hexene, cyclohexene, benzoic acid, 3-hydroxypyridine and 3-hydroxypiperidine.…”

Synthesis of nanostructured iron oxides and new magnetic ceramics using sol-gel and SPS techniques

“…Implementation of magnetic materials as sorbents in separation processes and agents for water purification [2], and also as catalysts [3], stimulates studies aimed on search of such systems. From this perspective the most studied magnetic, catalytic and sorption systems are iron oxides [4]. Among this variety of magnetic materials, applied in various fields of industry, science and technology, ceramic materials based on iron oxides takes pride of place [5].…”

Facile synthesis of α-Fe2O3 micro-ellipsoids by surfactant-free hydrothermal method for sub-ppm level H2S detection

“…Hematite (α-Fe 2 O 3 ) is one of the n-type metal oxide semiconductor materials widely utilized in the fields of catalysts, waste water treatment, pigment, magnetic materials, photo-catalyst, and electrode materials in lithium ion batteries [1][2][3][4][5][6][7]. Specially, α-Fe 2 O 3 is believed to be a promising sensing material due to its nontoxicity, stability and low cost.…”