A systematic review of clay-based photocatalysts for emergent micropollutants removal and microbial inactivation from aqueous media: Status and limitations. Issue 6 (December 2022)

• Record Type: Journal Article
• Authors: Heidari, Ava; Shahbazi, Afsaneh; Aminabhavi, Tejraj M.; Barceló, Damià; Rtimi, Sami
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 6(2022)
• Publication Date: 2022-12
• Subjects: Systematic review -- Clay-based photocatalysis -- Degradation -- Wastewater treatment; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108813
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Synthetic or natural substances that are emitted from nonpoint and point sources and end up in aquatic habitats at low concentrations are referred to as emerging micropollutants (EMPs). EMPs have negative consequences on both human health and the aquatic environment since they are not frequently tested and monitored. This comprehensive review covers the capabilities of clay-based photocatalysts for EMPs degradation and microbial inactivation in aqueous conditions. The PubMed, Scopus, and Web of Knowledge databases were searched for literature between 1970 and 2021 using Mesh terms. Following careful screening and analysis, it was determined that 79 papers in total were qualified for the review section. The results showed that pharmaceutical photodegradation was the focus of these studies, followed by microorganisms and industrial chemicals. The most common photocatalysts were TiO2, ZnO, CuxO, and Ag/Au, and the most frequent clay supports were montmorillonite, kaolinite, and bentonite for the degradation of EMPs and microbial inactivation. Numerous experimental variables, including pH, initial concentration, catalyst dosage, irradiation time, and applied light type were studied for their impact on pollutant photodegradation. Many studies focused on employing photocatalytic materials at neutral pH (6−7) to eliminate EMPs and microorganisms from aqueous media. 42.9% and 34.3% of these studies used UV irradiation and visible light, respectively as the principal sources of irradiation. The pseudo-first-order kinetic model had the best fit for the data. In 53% of the studies, the photocatalysts were recycled between two and four times. In general, clay-based photocatalysts are fascinating and efficient materials for the degradation and elimination of EMPs as well as microbial inactivation from water and wastewater. Graphical Abstract: ga1 Highlights: Clay based photocatalytic materials for emergent pollutants degradation have been reviewed. Clay based materials for microbial inactivation in water was revisited. Main parameter affecting the photocatalytic performance of clay materials were illustrated. Possible optimization approaches of clay-based photocatalysts were proposed.