Dual-sensitized modification engineering with enhanced photocatalytic degradation for organic dye

摘要

Organic pollutant is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a unique novel TiO_2-based dual-sensitized heterojunction photocatalyst (PbS/CdS/TiO_2) was successfully obtained by one step hydrothermal method, chemical bath deposition (CBD) method and ionic layer adsorption and reaction (SILAR) method. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterized the composition. PbS/CdS was successfully decorated on the surface of TiO_2 nanosheet array. As a stable catalyst with wide-spectrum (300-800 nm) optical response, excited electron-hole pairs of PbS/CdS/TiO_2 could apply in degrading organic pollutants. Successfully, the degradation efficiency of PbS(5 C)/CdS(30 min)/TiO_2 nanocomposites reached 99.9% under visible light, which was 5 times over pure TiO_2. This ternary heterostructured materials will be well-promising photocatalysts.