Visible/solar-light driving photocatalytic activity of TiO₂ nanotubes upon coating with phosphotungstate hybrid

Shift the Photocatalytic Activity of P25 TiO2 Nanoparticles toward the Visible Region upon Surface Modification with Organic Hybrid of Phosphotungstate

“…The TiO 2 -PTA-HMT-MB composite was prepared in two steps. In the first step, the PTA-HMT was prepared according to our previous works [15,16]. mL hexamethylenetetramine aqueous solution (1.0% w/w) was mixed with a 10 mL phosphotungstic acid aqueous solution (7.5% w/w).…”

“…Evaluation of the Photocatalytic Activity. Solar photocatalytic experiments were performed similar to our previous works [14,15]. 100 mL RhB (15 mg L -1 ) and a specific amount of the photocatalyst were transferred to a beaker, capped by cellophane, and exposed to sunlight in September 2017 between 11 am and 3 pm at the Payame Noor University, Ardakan, Yazd, Iran (GPS coordinates: 32°29 ′ N, 53°59 ′ E).…”

“…One other is modification with polyoxometalates (POMs), but pure POMs cannot shift the photocatalytic activity of pure P25 TiO 2 toward the visible region, and it is necessary to join them to valuable metallic or nonmetallic moieties [9][10][11][12][13]. In this work and in the following of our previous works [14,15], we have utilized the combination of dye sensitization and POMs, i.e., the adsorbed MB on phosphotungstate-hexamethylenetetramine hybrid (PTA-HMT-MB) as sensitizer. To our knowledge, the coating of P25 TiO 2 with a colored organic hybrid of POMs has not been reported yet.…”