Photocatalytic Characteristics of Nanometer‐Sized Titania Powders Fabricated by a Homogeneous‐Precipitation Process

Abstract

The photocatalytic characteristics of nanometer-sized TiO 2 powder prepared by a homogeneous-precipitation process (HPP) were compared with those of a commercial powder to determine which powder was better able to remove metal ions, such as lead and copper, from aqueous equimolar metalethylenediaminetetraacetic acid (EDTA) solution. In aqueous lead-EDTA solution, the TiO 2 powder fabricated by HPP had 3.5 times higher initial adsorption of lead ion and a 1.5 times faster rate for the complete elimination of lead ions than did the commercial powder. In an aqueous copper-EDTA solution, the TiO 2 powder fabricated by HPP also showed higher initial adsorption and a faster elimination rate for copper ions than did the commercial powder. Similarly, the photocatalytic properties were enhanced as the specific surface area increased, and the TiO 2 powder fabricated by HPP, which consisted of coagulated primary particles 20 nm in size, with chestnut-burr shapes, had a larger specific surface area (ϳ180 m 2 /g) than that of the commercial powder (ϳ55 m 2 /g).

Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

“…Large surface area semiconductors, usually in the nano-size range, have the advantage of a great interaction surface, which could lead to fast charge transfer kinetics [15,16]. Still, in these materials the energy band structure is not completely developed, and the orbitals on a given band are quantized.…”

Characterization of supported TiO2-based catalysts green-prepared and employed for photodegradation of malodorous DMDS

“…2, three TiO 2 -based catalysts had the same diffraction pattern. The spectra of samples display a crystalline structure with remarkable peaks at 27.408, 36.068, 41.268, and 54.368, and fingerprint peaks of rutile (1 1 0), (1 0 1), (1 1 1), and (2 1 1), respectively [23,28,29]. Furthermore, the semi-quantitative analysis of EDS with detection limit of 0.1% (w/w) was carried out for determining the elemental content of the TiO 2 -based catalysts in Fig.…”

“…However, Kim et al [21] produced ultrafine TiO 2 nano-powders with a large specific surface area using a homogeneous-precipitation process at low temperature. The spontaneous precipitation of TiO 2 for homogeneous rutile phase powders was enhanced by heating an aqueous TiOCl 2 solution from TiCl 4 [22][23][24]. Diluting and heating a highly viscous TiOCl 2 solution obtained from the reaction between water and TiCl 4 at a temperature below 100 8C produced ultrafine TiO 2 powders with a specific surface area of 150 m 2 /g.…”

Synthesis and characterization of nanoestructured TiO2 anatase-phase powders obtained by the homogeneous precipitation method

“…TiO 2 powders have been synthesized by using different methods such as, homogeneous precipitation [15,16], sol-gel [17], aerosol pyrolysis [18], hydrothermal synthesis [19], and chemical vapour synthesis [20], among others.…”