Notice of Retraction: Photocatalytic Degradation Kinetics of Reactive Bright Orange Solution with Phosphotungstic Acid

Abstract

The photocatalytic decomposition of Reactive Bright Orange (abbreviated as KGN) with polyoxometale, phosphotungstic acid (abbreviated as PTA), was investigated in an aqueous solution with a 253.7nm, 20W UV lamp. The results revealed that the photocatalytic degradation reaction of KGN with PTA in a homogenous aqueous solution can be described by Langmuir-Hinshelwood equation. The results manifested that the photocatalytic reaction was first-order for lower concentration (≤30mg L-1) KGN and is zero-order for higher concentration KGN (≥100mg L-1), when the irradiation intensity of the light was higher than 100lx. But for lower concentration KGN (10mg L-1), the photocatalytic reaction was zero-order, when the irradiation intensity of the light was lower than 100lx . The knowledge on the kinetics of the system possesses both practical and theoretical values.