Hierarchical TiO₂ nanonetwork–porous Ti 3D hybrid photocatalysts for continuous-flow photoelectrodegradation of organic pollutants

Abstract

Photocatalysis is an efficient approach for the degradation of organic pollutants, and continuous-flow photodegradation has advantages compared to general photocatalysis, which uses powder photocatalysts. Herein, we present a novel three-dimensional (3D) micro-nano hierarchical photocatalyst, TiO 2 nanonetwork-powder metallurgical porous titanium hybrid material (TiO 2 /porous Ti), for continuous filtration photocatalysis/photoelectrocatalysis prepared through a hydrothermal-based chemical method. A photocatalytic layer of 3D TiO 2 nanowire networks self-assembled on the surface of metallic porous Ti channels to form TiO 2 /porous Ti. The interconnected TiO 2 thin nanowire networks with anatase-rutile bi-phases introduces a photocatalytic layer with a high photocatalytic performance.The metallic titanium porous structures and wire-like morphology can enhance the photo-induced carrier transport and separation, and they can act as a 3D electrode for photoelectrocatalysis. A novel continuous-flow photocatalytic reactor was designed by setting a group of TiO 2 /porous Ti sheets vertically in a quartz box equipped with ultraviolet light-emitting diodes (UV-LED). By applying a 0.6 V low electrical bias between the TiO 2 /porous Ti electrodes and a Pt wire electrode, a device with one layer of TiO 2 /porous Ti can result in 90% degradation of methyl orange (MO) under

Applications of Phosphorene and Black Phosphorus in Energy Conversion and Storage Devices

“…However, these approaches have either low efficiency or high cost. Photocatalytic degradation is a novel solution that uses semiconductor nanoparticles whose wide band gaps allow the utilization of ultraviolet light …”

2D and 3D Nanomaterials for Photoelectrocatalytic Removal of Organic Pollutants from Water

“…In this hybrid photocatalyst, a 3D TiO 2 nanowire network layer is assembled on the surface of micrometer scale channels of porous Ti using a hydrothermal‐based chemical method on the surface of micrometer scale channels of porous Ti. [ 89 ] The morphology of the as‐obtained H 2 Ti 3 O 7 /porous Ti is shown in Figure a after the proton exchange process of Na 2 Ti 3 O 7 /porous Ti. Figure 5b shows a simple practical reaction reactor for continuous photoelectrocatalytic for methylene blue (MB) decomposition.…”

“…c)The degradation degree of MO (20 mg L −1 ) using TiO 2 /porous Ti under different conditions for different times. Reproduced with permission [89]. Copyright 2017, Royal Society of Chemistry.…”

Preparing a dual-function BiVO4/NiFe-LDH composite photoanode for enhanced photoelectrocatalytic wastewater treatment and simultaneous hydrogen evolution

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