Abstract
Organic pollutant is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a unique novel TiO2-based dual-sensitized heterojunction photocatalyst (PbS/CdS/TiO2) 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 TiO2 nanosheet array. As a stable catalyst with wide-spectrum (300–800 nm) optical response, excited electron–hole pairs of PbS/CdS/TiO2 could apply in degrading organic pollutants. Successfully, the degradation efficiency of PbS(5 C)/CdS(30 min)/TiO2 nanocomposites reached 99.9% under visible light, which was 5 times over pure TiO2. This ternary heterostructured materials will be well-promising photocatalysts.
Highlights
With the demand of development in science and technology, storage of fossil energy is nearly exhausted, simultaneously, numerous organic toxins are produced and released into water through the process of industrialization[1,2,3]
The PbS NCs were synthesized by successive ionic layer adsorption and reaction (SILAR) method, which were assembled onto cadmium sulfide (CdS)[10-40]/T
X-ray diffraction (XRD) measurement for TiO2 NSs, CdS/TiO2 NSs and PbS/CdS/TiO2 NSs were performed as shown in Figure2a, which showed diffraction peaks at 25.34°, 37.83°, 48.10° and 55.06° corresponding to the [101], (004), [200] and [211] crystal planes of anatase TiO2 phase (JCPDS#21-1272)(32, 33)
Summary
With the demand of development in science and technology, storage of fossil energy is nearly exhausted, simultaneously, numerous organic toxins are produced and released into water through the process of industrialization[1,2,3]. Semiconductor materials have been considered in more consideration due to their attractive applications including energy conversion, storage, solar fuel, photocatalytic and medical[7, 8]. They are regarded as potential catalyst for wastewater management and water splitting, which can directly decompose the pollutants absorbed on the surface through redox processes[9, 10]. Numerous researchers have studied that combining the photoprocess with physical or chemical methods was an effective way to improve the efficiency of photodecomposition over TiO2(16-19) Among them, it is one of the most effective way that building multiple heterojunction between semiconductors[7, 20,21,22]. It may lead to a new alternative or potential technology for future photocatalyst design and improvement in practical applications
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