Bi2S3 Nanowires: First-Principles Phonon Dynamics and Their Photocatalytic Environmental Remediation

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.