Effects of titania films on the oxidation resistance and dispersibility of ultrafine diamond

Green Recovery of Titanium and Effective Regeneration of TiO2 Photocatalysts from Spent Selective Catalytic Reduction Catalysts

“…TiO 2 has attracted considerable attention as a photocatalyst to degrade organic pollutants in aqueous waste owing to its resistance to photocorrosion, chemical inertness, and nontoxicity as well as ideally producing CO 2 and H 2 O as end products. − However, there are still some shortcomings in practical applications of TiO 2 photocatalysts: (1) low utilization of solar energy due to their wide band gap (3.2 eV for anatase and 3.0 eV for rutile); (2) the low quantum yield caused by their high electron–hole pair recombination rate; and (3) their high cost because they are mainly prepared with expensive chemical reagents, such as TiCl 4 , , TiOSO 4 , , and titanium isopropoxide . To solve these problems, this work proposes the use of spent SCR catalysts as an ideal raw material.…”

“…7−12 However, there are still some shortcomings in practical applications of TiO 2 photocatalysts: (1) low utilization of solar energy due to their wide band gap (3.2 eV for anatase and 3.0 eV for rutile); (2) the low quantum yield caused by their high electron−hole pair recombination rate; and (3) their high cost because they are mainly prepared with expensive chemical reagents, such as TiCl 4 , 13,14 TiOSO 4 , 15,16 and titanium isopropoxide. 17 To solve these problems, this work proposes the use of spent SCR catalysts as an ideal raw material. Spent SCR catalysts are hazardous waste with a high content of titanium components, and thus, their reuse is urgently required to protect titanium resources, reduce the cost of TiO 2 production, and relieve the environmental burden.…”

Sustainable Approach for Spent V2O5–WO3/TiO2 Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO3–TiO2 Photocatalysts

“…Nanostructured TiO 2 photocatalysts have received considerable attention in recent decades because they can be used in energy and environmental fields. − However, some weaknesses remain in the practical application of nanostructured TiO 2 photocatalysts, for example, (1) low usage of solar energy and low quantum yield and (2) high cost because the cost of expensive chemical reagents usually used in the laboratory for preparing TiO 2 . − To overcome such problems, this work proposed using spent V 2 O 5 –WO 3 /TiO 2 catalysts as a secondary raw material. The mass fraction of the TiO 2 component is >80% in the spent V 2 O 5 –WO 3 /TiO 2 catalysts.…”