Photocatalytic Degradation of Acid Yellow 36 Using Zinc Oxide Photocatalyst in Aqueous Media

Abstract

A detailed investigation of photocatalytic degradation of Acid Yellow 36 (AY36) has been carried out in aqueous heterogeneous medium containing ZnO as photocatalyst in a batch reactor. The effects of some parameters such as pH, catalyst loading, and ethanol concentration were examined. Solutions with initial concentration of 50 mg L−1 of dye, within the range of typical concentration in textile wastewaters, were treated at natural pH of 6.93 and catalyst concentration of 1 g L−1 after 180 min irradiation. Investigations on the active species indicated that hydroxyl radicals play the major role in the process. Experiments showed that the most efficient pH on the removal of the dye with photocatalytic degradation process was 8; however, acidic pH was favored for the dark surface adsorption. Electrical energy consumption per order of magnitude for photocatalytic degradation of AY36 has been also determined.

Synthesis of 1-D ZnO nanorods and polypyrrole/1-D ZnO nanocomposites for photocatalysis and gas sensor applications

“…This causes [46,47]. The hydroxyl radicals formed on the ZnO surface are strong oxidizing agents, which lead to the photodegradation of crystal violet.…”

ZnO for photocatalytic air purification applications

“…The photocatalytic materials have various applications such as self-cleaning [1], antifogging [2], antibacterial actions [3][4][5], deodorization [6] or decomposition and removal of pollutant [7][8][9][10][11][12][13]. These applications are responsible for the development of a broaden range of so called smart materials used constructions.…”

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A green process for efficient lignin (biomass) degradation and hydrogen production via water splitting using nanostructured C, N, S-doped ZnO under solar light

“…Amongst 55 the renewable energy resources, solar energy is the largest exploitable resource, and it is estimated that ~0.014% of the solar energy reaching the earth is enough to sustain domestic purpose. 14 The efficient directconversion of solar energy intochemical energy, preferably solar light driven photocatalytic 60 water splitting and degradation of lignin has an immense importance. 15,16 The number of photocatalysts such as TiO 2 , TiO 2 -graphene, tungsten carbide (WC), zinc oxide (ZnO), zinc sulfide (ZnS), tin oxide SnO 2 , etc., reported are considered to be the best with respect to H 2 production and lignin degradation in ultraviolet (UV) light are not economical for large-scale water treatment, thereby interest has been focused towards visible light driven photocatalysis.…”