Bi<sub>2</sub>S<sub>3</sub> Nanowires: First-Principles Phonon Dynamics and Their Photocatalytic Environmental Remediation
Thi Thu, T. Thai Ha Vu, Giang Truong Ho, Quang Ngan Pham, Hong Thai Giang, Le Anh Thi, Minh Tân Mẫn, Dai Lam Tran
Abstract
We reported the synthesis and full characterization of ultralong Bi2S3 nanowires with diameters of 60–80 nm and lengths above 1 μm, showing growth in the [001] direction. Combining the computed lattice dynamics of orthorhombic Bi2S3 with the experimental micro-Raman scattering study provided comprehensive solutions. We demonstrate that 10 active modes originated from Raman symmetry modes (4Ag + 2B1g + 3B2g + 1B3g), and the peak at 124 cm–1 is due to the IR-active B3u mode. The use of the Bi2S3 catalyst for dewatering hexavalent chromium-containing wastewater was also reported. This confirms it to be a potential candidate for photocatalytic environmental remediation.