Synthesis of a ZnO/CdS/TiO₂ Composite with Enhanced Photocatalytic Activity and Stability by a Simple Solution‐Based Method

Abstract

A simple, low-cost synthetic approach was developed for fabricating a TiO 2 layer on the surface of CdS-sensitized ZnO nanorods by a liquid-phase deposition method. In the ZnO/CdS/TiO 2 composite structure, CdS quantum dots are grown on ZnO nanorods and the resulting CdS/ZnO nanorods are uniformly coated with a TiO 2 layer. UV/Vis absorption spectroscopy showed that CdS could provide better light-harvesting ability, and the photocatalytic activity was significantly im- [a]

g-C3N4-Mediated Synthesis of Cu2O To Obtain Porous Composites with Improved Visible Light Photocatalytic Degradation of Organic Dyes

“…To some extent, this limitation has been surmounted by combining these oxides with noble metals to extend the absorption into the visible region by the plasmonic effect, thereby improving their performance. 5−8 Alternatively, these materials have been combined with low band gap materials such as Cu 2 O, 9,10 WO 3 , , 11,12 In 2 O 3 , 13,14 CdS, 15 and so forth, rendering them favorable for the photocatalytic applications.…”

“…Semiconducting oxides such as TiO 2 and ZnO have been extensively studied for their applications in photocatalysis, primarily because of their inherent features such as nontoxicity, stability, insolubility in water, high reactivity, and favorable photochemical properties. − One of the major drawbacks of these materials is their optical band gap in the UV region, limiting their widespread applicability. To some extent, this limitation has been surmounted by combining these oxides with noble metals to extend the absorption into the visible region by the plasmonic effect, thereby improving their performance. − Alternatively, these materials have been combined with low band gap materials such as Cu 2 O, , WO 3 , , , In 2 O 3 , , CdS, and so forth, rendering them favorable for the photocatalytic applications.…”

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

“…One of the most important factors for the applicability of photocatalytic materials is their long-term stability, in both the physicochemical and catalytic sense. The former aspect is usually addressed by analyzing spent materials using techniques such as X-ray diffraction analysis [ 64 , 141 ], scanning electron microscopy (SEM)/transmission electron microscopy (TEM) imaging [ 142 , 143 ], and there derived energy-dispersive x-ray spectroscopy (EDS) patterns [ 143 ], Fourier-transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) [ 142 , 144 ], or solid-phase UV–Vis spectroscopy. The overall goal of the aforementioned techniques is to confirm the retention of the overall morphology, crystal structure, and optoelectronic properties.…”

“…One of the most important factors for the applicability of photocatalytic materials is their long-term stability, in both the physicochemical and catalytic sense. The former aspect is usually addressed by analyzing spent materials using techniques such as X-ray diffraction analysis [64,141], scanning electron microscopy (SEM)/ transmission electron microscopy (TEM) imaging [142,143], and there derived Fig. 10 Structures (A-C) of mesoporous films of TiO 2 .…”

“…B Improved transmittance of spherical nanoparticle aggregate (NSA) film. Reprinted with permission from IOP Publishing [138] energy-dispersive x-ray spectroscopy (EDS) patterns [143], Fourier-transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) [142,144], or solid-phase UV-Vis spectroscopy. The overall goal of the aforementioned techniques is to confirm the retention of the overall morphology, crystal structure, and optoelectronic properties.…”