Photocatalytic removal of organic pollutants in aqueous solution by Bi4Nb Ta(1−)O8I

Photocatalytic degradation of bisphenol A in the presence of C-doped ZnO: Effect of operational parameters and photodegradation mechanism

“…However, as the catalyst concentration increases continuously, the particles agglomerate and then the specific surface areas are reduced and finally exhibit a depressed photocatalytic activity. Hu et al reported that the excess catalyst particles can create a light screening effect that reduces the surface area of catalyst when exposed to light illumination, and thus decreases the photocatalytic efficiency [44]. Hence under our experimental conditions 1 g L À1 is found to be the optimum catalyst concentration for the BPA photocatalytic degradation and mineralization.…”

Bi4TaO8Cl Nano-Photocatalyst: Influence of Local, Average, and Band Structure

“…Their layered structure, consisting of interleaved Bi 2 O 2 slabs, responsible for effective production of electron hole pairs, plays a major role in improving photocatalytic performance . In this context, the Aurivillius–Sillen phases ([Bi 2 O 2 ]­[TaO 3 n +1 ]­[Bi 2 O 2 ]­[Cl]) − are found to be promising catalysts for sunlight-driven photocatalytic dye degradation. Less attention has been paid to these phases though they exhibit a variety of crystal structures and also provide a facile environment for enhanced photocatalysis.…”

Pharmaceuticals Removal by Novel Nanoscale Photocatalyst Bi4VO8Cl: Influencing Factors, Kinetics, and Mechanism

“…23−26 However, to efficiently utilize the largest proportion of the solar spectrum and artificial visible light, development of high activity photocatalysts under a wide range of visible light irradiation is indispensable. A literature survey reveals that Bi-containing compounds, such as BiMO 4 (M = V, Nb, and Ta), 27−29 Bi 3 NbO 7 , 30 Bi 4 Ti 3 O 12 , 31 Bi 2 MoO 6 , 32 Bi 2 WO 6 , 33 Bi 2 Mo 3 O 12 , 34 Bi 2 W 2 O 9 , 35 Bi 2 Mo 2 O 9 , 36 and the layered Bi-based oxyhalides BiOX (X = Cl, Br, I), 37 BiOBr 1−x I x , 38 BiOI x Cl 1−x , 39 Bi 4 NbO 8 Cl, 40 Bi 4 TaO 8 I 41 and Bi 4 Nb x Ta (1-x) O 8 I, 42 have good visible-light-response property and have been extensively investigated as a new class of photocatalysts independently of TiO 2 and its modified forms. [24][25][26]43 Considering the fact that nanoscale photocatalysts are favorable to the enhancement of photocatalytic efficiency due to its high surface-to-volume ratio and high separation efficiency of the photogenerated electrons or holes, 43,44 nanoscale photocatalyst Bi 4 VO 8 Cl was prepared by using hydrothermal synthesis and characterized with XPS, UV−vis DRS, SEM, and TEM in the present work.…”