In Situ Construction of Bronze/Anatase TiO2 Homogeneous Heterojunctions and Their Photocatalytic Performances

Abstract

Photocatalytic degradation is one of the most promising emerging technologies for environmental pollution control. However, the preparation of efficient, low-cost photocatalysts still faces many challenges. TiO2 is a widely available and inexpensive photocatalyst material, but improving its catalytic degradation performance has posed a significant challenge due to its shortcomings, such as the easy recombination of its photogenerated electron–hole pairs and its difficulty in absorbing visible light. The construction of homogeneous heterojunctions is an effective means to enhance the photocatalytic performances of photocatalysts. In this study, a TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst (with B and A denoting bronze and anatase phases, respectively) was successfully constructed in situ. Although the construction of homogeneous heterojunctions did not improve the light absorption performance of the material, its photocatalytic degradation performance was substantially enhanced. This was due to the suppression of the recombination of photogenerated electron–hole pairs and the enhancement of the carrier mobility. The photocatalytic ability of the TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst was up to three times higher than that of raw TiO2 (pure anatase TiO2).

Preparation of a Z-Type g-C3N4/(A-R)TiO2 Composite Catalyst and Its Mechanism for Degradation of Gaseous and Liquid Ammonia

“…When 2θ = 25.28°, 36.95°, 37.80°, 38.55°, 48.04°, 53.89°, 55.06°, 62.68°, 70.31°, 75.03°, and 76.02°, the characteristic peaks corresponding to the (101), (103), (004), (112), (200), (105), (211), (204), (220), (215), and (301) crystal planes, respectively, were almost consistent with the anatase TiO 2 (JCPDS No. 21-1272) standard cards [ 27 ]. Furthermore, 2θ = 27.45°, 36.09°, 39.19°, 41.26°, 44.05°, 54.32°, 56.64°, 64.04°, and 69.01° corresponded to the (110), (101), (200), (111), (210), (211), (220), (310), and (301) crystal planes, respectively, which was almost consistent with the rutile TiO 2 (JCPDS No.…”

Facile green synthesis of a dahlia-like anatase/TiO2(B) phase junction for boosting the photocatalytic degradation of persistent tetracycline

“…Lots of studies have testified that fabricating a phase junction can effectively accelerate the separation of photogenerated carriers and that constructing a 3D hierarchical porous architecture can provide high surface area which not only facilitates antibiotic adsorption and diffusion, but also enables more active sites to participate in the degradation reaction. 10,11 Therefore, the design and synthesis of a TiO 2 phase junction with a hierarchical porous structure is expected to dramatically improve photocatalytic activity.…”