Bi-based nanoparticles were successfully synthesized (500 °C/2 h) following two intermediate-temperature routes, Pechini and a combined method of mechanical milling/molten salts. Herein, α-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructures were identified. These types of heterostructures have shown advantages to improving the visible light responsive activity of Bi-based nanoparticles to facilitate the separation of photogenerated electron-hole pairs. By fixing the experimental parameters, the synthesis route and Ag contents showed to play a very important role in the phase composition of the Ag-containing samples; the formation of Bi/Ag-Bi 2 O 3 /Bi 2 O 2 CO 3 and Ag/Ag-Bi 2 O 3 /Bi 2 O 2 CO 3 complex hybrid structures were revealed. The α-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructure prepared by combined method exhibited higher photocatalytic efficiency (66.84%) for degrading methylene blue (MB) depending on Bi 2 O 2 CO 3 component proportion. For the Ag-containing hybrid structures, the performance of their catalytic activity did not show an increase with respect to α-Bi 2 O 3 /Bi 2 O 2 CO 3 . However, in these samples, the degradation efficiency was slightly enhanced with the efficient doping of Ag into the α-Bi 2 O 3 structure and the existence of Bi when Pechini method was used. Also, a possible photocatalytic process for degrading MB is presented. This article is protected by copyright. All rights reserved.
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics