Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

Abstract

Pictorial representation of all possible dye degradation reaction in UV light initiated indirect dye degradation mechanism. This mechanism is practically more important over visible light initiated direct mechanism.

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

“…4,5,24 The charge recombination centres may be overloaded dopants or structure deciencies, for instance O vac .…”

“…[1][2][3][4] Among various photocatalysts, ZnO and TiO 2 are most plausible due to their high photosensitivity, nontoxicity, low cost, though they can only utilise a small portion of solar energy (3-5%) in the UV region owing to their large bandgap. [5][6][7][8] Similar to TiO 2 , ZnO possesses great potential in modulation of bandgap for harvesting visible light but it is easier to crystallise and use in the manufacture of devices.…”

Highly Crystallized C-Doped Mesoporous Anatase TiO2 with Visible Light Photocatalytic Activity

“…Since the discovery of its photocatalytic activity more than four decades ago, TiO 2 has received a great deal of attention as a photocatalyst owing to its excellent properties, such as environmental friendliness, chemical stability, and low cost [1][2][3][4][5]. Despite extensive effort worldwide, there are still problems which limit the effectiveness of TiO 2 catalyst, including restrictive light absorption (only responsive to ultraviolet light with a wavelength below 387 nm due to its wide band-gap); fast charge-carrier recombination; and low interfacial charge-transfer rate of photogenerated carriers.…”

Facile synthesis of porous Ag3PO4 particles and its application in MB wastewater degradation under visible light irradiation

“…TiO2-based photocatalysts have been widely used for photo-catalytic degradation of dyes; however, TiO2 with a relatively wide band gap of 3.2 eV limits its efficient utilization of sunlight [3]. Therefore, it is highly desirable to design new visiblelight-induced photocatalysts from the viewpoint of using visible light.…”