Construction of n-TiO2/p-Ag2O Junction on Carbon Fiber Cloth with Vis–NIR Photoresponse as a Filter-Membrane-Shaped Photocatalyst

Abstract

The development of effective and reusable photocatalysts with broad-spectra activity has attracted attention. Herein, we have constructed n-TiO 2 /p-Ag 2 O junction on carbon fiber (CF) cloth as an efficient and recyclable photocatalyst. With CF cloth as the substrate, TiO 2 nanorods (length: 1-2 µm) are prepared by a hydrothermal process, and the in-situ growth of Ag 2 O nanoparticles (10-20 nm) is then realized by chemical bath deposition route. The flexible CF/TiO 2 /Ag 2 O cloth (area: 4 × 4 cm 2) shows a broad and strong photo-absorption (200-1000 nm). Under the illumination of visible-light (λ > 400 nm), CF/ TiO 2 /Ag 2 O cloth can efficiently eliminate 99.2% rhodamine B (RhB), 99.4% acid orange 7 (AO7), 87.6% bisphenol A (BPA), and 89.5% hexavalent chromium (Cr 6+) in 100 min, superior to CF/Ag 2 O cloth (83.5% RhB, 60.0% AO7, 31.2% BPA and 41.8% Cr 6+). In particular, under the NIR-light illumination (980 nm laser), CF/TiO 2 /Ag 2 O cloth can remove 70.9% AO7 and 60.0% Cr 6+ in 100 min, which are significantly higher than those by CF/Ag 2 O cloth (19.8% AO7 and 18.9% Cr 6+). In addition, CF/TiO 2 /Ag 2 O cloth (diameter: 10 cm), as a filter-membrane, can effectively wipe off 94.4% flowing RhB solution (rate: ~ 1 L h − 1) at 6th filtering/degrading grade. Thus, CF/TiO 2 /Ag 2 O cloth can be used as a Vis-NIR-responded filtermembrane-shaped photocatalyst with high-efficiency for purifying wastewater.

Rational Design of Semiconductor Heterojunctions for Photocatalysis

“…[ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ] The applications of heterojunctions in photocatalysis cover various aspects of modern life. [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ] The key requirements for the design of an efficient photocatalyst are (1) a good visible light absorption, (2) a favorable position of the edges of the valence and conduction bands (VB and CB) with respect to target redox species, (3) an efficient charge carriers separation upon excitation, (4) a high mobility and low recombination rate of the charge carriers, and last but not least (5) a good chemical stability. [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] Composite materials in which two or more units are in intimate contact thanks to the formation of a junction region can in principle successfully address all these aspects.…”

A Flexible Self‐Powered UV Photodetector and Optical UV Filter Based on β‐Bi2O3/SnO2 Quantum Dots Schottky Heterojunction

“…[ 25 ] The null transmittance property was attained because both the β‐Bi 2 O 3 and SnO 2 molecules have very high UV absorption, which allows them to absorb UV radiation and backscatter non‐transmitted UV radiation, making the polypropylene cloth coated β‐Bi 2 O 3 /SnO 2 a promising UV protection material. [ 26 ] UV filter application could also be extended for wide bandgap semiconductors based on the absorption coefficient, biocompatibility, and availability of the similar structured metal oxides (Ga 2 O 3 ,ZnO). To verify the reactivity of DMF toward polypropylene cloth UV–vis spectroscopy studies were performed for pristine polypropylene cloth and polypropylene cloth coated with DMF as shown in Figure S7, Supporting Information.…”

Synthesis of novel α-Fe2O3-Bi2S3-Gr for efficient photocatalytic degradation of environmental pollutants under visible-LED light irradiation

“…Advanced oxidation processes (AOPs) have been widely practiced to eliminate organic pollutants [6]. Particularly, the photo Fenton oxidation process has been proved its high-efficiency and environmentally friendliness in the degradation of organic pollutants in wastewater [7][8][9][10][11]. Nevertheless, homogenous Fenton oxidation reactions encountered limitations such as the generation of ferric hydroxide sludge, the use of strong acid and the poor reusability of the catalyst [12].…”