Photocatalytic degradation of pollutants in petroleum refinery wastewater by TiO2- and ZnO-based photocatalysts: Recent development. (20th December 2018)

• Record Type: Journal Article
• Authors: Ani, I.J.; Akpan, U.G.; Olutoye, M.A.; Hameed, B.H.
• Is Part Of: Journal of cleaner production. Volume 205(2018)
• Page Start: 930
• Page End: 954
• Publication Date: 2018-12-20
• Subjects: Reusability -- Photocatalyst -- Petroleum refinery wastewater -- Pollutant -- Mechanism -- Heterojunction -- Contents; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.08.189
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Environmental pollution by Petroleum refinery wastewater (PRW) raises vital call for attention to scientist and industrialists due to its impact on human and eco-system. This manuscript reviews methods on modification of semiconductors, effect of operating parameters, reusability/stability, along with recent development on TiO2 - and ZnO-based photocatalysts towards degradation of PRW pollutants. TiO2 and ZnO can be successfully modified to visible/solar light responsive photocatalysts. In-depth knowledge of reaction mechanism between photocatalysts and sorbates, structure formation in modified photocatalysts with respect to generation/mobilization of photo-charged carriers, informs the choice of composition of photocatalysts. Petroleum refineries are yet to benefit from heterogeneous photocatalysis due to some setbacks such as: recovery of photocatalysts for reuse, inability of the catalyst to degrade high concentration of pollutants, inability to handle the complex nature of PRW, and its reusability. Thus, a multifunctional and cost effective photocatalyst with reusability/stability needs more exploration to enable commercialization of the photocatalysts. Highlights: TiO2 and ZnO remain the most stable photocatalysts under UV radiation. These can be successfully modified for Visible/Solar light enablement. Heterojunction, particularly type III, exhibits great ability for practical application. The complex nature of PRW hinders petroleum refinery from heterogeneous photocatalytic benefits. A multifunctional and reusable photocatalyst is proposed for PRW treatment.