Characterization of HF-catalyzed silica gels doped with Degussa P25 titanium dioxide

Removal of trace level aqueous mercury by adsorption and photocatalysis on silica–titania composites

“…Comparing the specific surface areas of the two materials (Table 1), STC-2-50 has a much lower specific surface area than STC-0.25-12 but performs better. However, while the total specific surface area of the composite is lower, the specific surface area of TiO 2 in the STC increases with increased TiO 2 loading [15]. STC-2-50 has more available TiO 2 adsorption sites than that of STC-0.25-12.…”

“…The effect of these changes will be discussed with regards to mercury removal later in this work. Further material characterization can be found elsewhere [15]. Table 1 BET specific surface area, pore diameter and pore volume values as measured by nitrogen adsorption/desorption.…”

“…The proposed technology can be adapted for various treatment stream applications such as in line, batch, or pump and treat configurations. The silica-titania composite materials have been developed [14], characterized [15], and successfully applied for specific applications for mercury removal from flue gas [14,16], mercury recovery from caustic exhaust emitted from the chlor-alkali industry [17], and the degradation of volatile organic compounds in gas emitted from pulp and paper mills [18]. The aim of this study is to evaluate the potential for silica-titania composites to remove trace level mercury from aqueous solutions.…”

A high surface area magnetic photocatalyst with controlled pore size

“…The particles were stirred for 24 h with a PTFE overhead mixer at 475 rpm. The resulting particles were dried at 658C for 24 h resulting in a total mass of $ 4.40 g. The silica-coated barium ferrite particles and 18.9 g titanium dioxide (Degussa P25) were then dispersed in an acid catalyzed silica sol-gel [19]. The was prepared with 113 mL of Nanopure water (18.2 MX/cm), 225 mL ethanol, 156 mL TEOS, 18 mL 1 M HNO3, and varying volumes of 3% hydrofluoric acid.…”

Synthesis and characterization of metal doped titanium dioxide, transition metal phosphides, sulfides and thiophosphates for photocatalysis and energy applications

“…P25 TiO 2 has a surface area of ~ 40-50 m 2 /g, but can be increased from added supports, or deposition. 111,112 It is one of the leading materials in UV photocatlysis. 113 Reasons behind this enhanced activity have been investigated.…”