Polyoxometalates and Their Composites as Photocatalysts for Organic Pollutants Degradation in Aqueous Media—A Review. Issue 12 (23rd November 2018)

• Record Type: Journal Article
• Authors: Dehghani, Ramin; Aber, Soheil; Mahdizadeh, Fatemeh
• Is Part Of: Clean. Volume 46:Issue 12(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-23
• Subjects: degradation -- keggin -- organic pollutants -- photocatalysts -- polyoxometalates; Water quality -- Periodicals; Water -- Pollution -- Periodicals; Pollution -- Periodicals; Bioremediation -- Periodicals; Sewage -- Periodicals; Water chemistry -- Periodicals; 333.7205
• DOI: 10.1002/clen.201800413
• Languages: English
• ISSNs: 1863-0650

Abstract

Abstract : Polyoxometalates (POMs), eco‐friendly solid acids, are polyatomic anions containing transition metal (group 5 or group 6) oxyanions linked together through shared oxygen atoms. First, the structure, classification, synthesis, non‐photocatalytic applications, and their photocatalytic properties and applications are presented. POMs are very interesting due to their unique and remarkable characteristics. One of the most attractive characteristics of POMs is their activity as an electron relay, that is, they can undergo stepwise multi‐electron redox reactions while their construction remains intact. Based on this characteristic, POMs have been widely used as photooxidation catalysts for organic and inorganic contaminants removal. According to the literature, POMs are useful homogeneous photocatalysts for the mineralization of dyes, phenol and its derivatives, chloroacetic acids, and pesticides and wood pulp bleaching. Applications of POMs have been limited because of their high solubility in water. Immobilization and solidification of POMs using different methods and various supports for making them reusable are studied in this review. Varieties of composites of POMs are synthesized to make them photorespond to the visible light region. Abstract : Polyoxometalates (POMs) exhibit attractive properties and great potential as photocatalysts. They show excellent performance for the degradation of different categories of organic pollutants including dyes, phenolic compounds, pharmaceuticals, etc. POMs have antibacterial activity and also the ability to recover heavy metals from water.