Effective development and utilization of SILAR-assisted TiO2 and CsPb2Br5 nanocomposites for photochemical and biological cleaning of environment

Abstract

Recently, cesium lead halide perovskites such as CsPb2Br5 and CsPbBr3 have drawn the attention of researchers because of their unique optical, electronic, and chemical properties. To improve the photo and/or chemical performance of such CsPb2Br5 (termed as CPB hereafter), we have realized multiple facile routes for its combination with UV-active TiO2 nanoparticles. Resultantly developed binary nanocomposites of TiO2, CPB perovskites and TiO2/CPB-nanocomposite (TiO2/CPB-NC) offered a meaningful photochemical contrast between pseudo-successive ionic layer adsorption and reaction (p-SILAR) and electrostatic self-assembly methods for targeting photocatalytic degradation of toxic dyes under solar irradiation and resulted significant performance as reactant for oxygen evolution (OER) as revealed by extensive electrochemical impedance spectroscopy (EIS). In parallel to extensive material-based characterization using SEM, XRD, and UV Vis. etc, the study was further extended to the theoretical investigation of the structure of CsPb2Br5, and antibacterial activity against gram-positive and gram-negative bacteria namely Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). RhB degradation of TiO2 increased from 13% to 58% by deposition of CPB, in parallel to 100% inhition zone growth.