Journal
JOURNAL OF CLEANER PRODUCTION
Volume 205, Issue -, Pages 930-954Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.08.189
Keywords
Reusability; Photocatalyst; Petroleum refinery wastewater; Pollutant; Mechanism; Heterojunction; Contents
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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 photo catalysts 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. (C) 2018 Elsevier Ltd. All rights reserved.
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