One-step sol–gel preparation and enhanced photocatalytic activity of porous polyoxometalate–tantalum pentoxide nanocomposites

Nanoporous polymer monoliths as adsorptive supports for robust photocatalyst of Degussa P25

“…As expected, these supported photocatalysts also exhibit high photocatalytic activities, thus giving a respectable foreground in practical applications. On the other hand, adsorptive supports would be beneficial to enrichment of organic pollutants [24], accelerating the photocatalytic rate consequentially. For example, activated carbon was chosen as an efficient support due to its adsorptive properties for organic pollutants, and these studies have shown the positive effects [12][13][14][25][26][27].…”

RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid

“…POMs represent the analogues of semiconductor metal oxides [8]. The photochemical behavior of POMs have been extensively studied in homogeneous systems [8][9][10][11][12][13][14][15][16]. However, kinetic studies on their photooxidative behavior have received less attention compared to the semiconductor photocatalysts.…”

Heteropolyacid‐Based Materials as Heterogeneous Photocatalysts

“…[60] They deposited H 3 PW 12 O 40 and H 6 P 2 W 18 O 62 on Ta 2 O 5 with loading levels of 5.6-15.3 wt.-% and used these composites to decompose and mineralize salicylic acid and rhodamine B under visible-light excitation. [85] Analogous to that reported for the HPA/TiO 2 composite [60] and owing to the similar electronegativity and ionic radius of Ta 5+ and W 6+ , the authors claimed the existence of an electrostatic interaction between the terminal W=O groups of the Keggin cluster and the Ta-OH -. The absorption threshold onset of these HPA/Ta 2 O 5 composites was extended to the visible region (420 nm) and resulted in an enhancement in the photocatalytic activity of these composites relative to that of both the bare HPA units and Ta 2 O 5 .…”

“…The supported HPAs evidenced important changes in structure, acid strength, and redox properties with respect to the unsupported material. For instance, the most studied plenary Keggin HPAs were supported on several oxides, such as SiO 2 , [21][22][23][24][25] Al 2 O 3 , [26,27] ZrO 2 , [28,29] and Ta 2 O 5 [30] and on carbon. [21,31] Silica is widely favored as a support, because it interacts weakly with the Keggin anions, and thus their structures are preserved.…”