Heteropolyacid‐Based Materials as Heterogeneous Photocatalysts

Abstract

Invited for the cover of this issue is the group of Giuseppe Marcì and Leonardo Palmisano at the Università degli Studi di Palermo, Italy. The cover image shows one aspect of the photocatalytic use of heteropolyacids: dye bleaching by irradiation with sunlight.

An overview report on the application of heteropoly acids on supporting materials in the photocatalytic degradation of organic pollutants from aqueous solutions

“…In this regard, photocatalytic degradation can be regarded as one of the promising technologies to solve this problem (Lu et al, 2013; Norzaee et al, 2017). During the last decade, heterogeneous photocatalysis has received much attention as an unconventional technology in environmental remediation because of its advantages such as applying mild experimental conditions; i.e., atmospheric pressure and room temperature (Marcì, García-López & Palmisano, 2014). This technique can degrade most of the organic pollutants and mineralize them to final products such as carbon dioxide, water, and other small inorganic molecules (Feng, Shang & Liu, 2014).…”

“…In addition, some attempts have been made to use sensitizers on the surface of photocatalyst or couple with other semiconductors in order to modify the physiochemical and electronic properties of photocatalyst (Marcì, García-López & Palmisano, 2014). Heteropoly acids (HPA), as green and eco-friendly catalysts, have been proposed as potential candidates to be used as surface modifiers of TiO 2 intended for photocatalytic degradation (Hakimi et al, 2014; Li, Vorontsov & Jing, 2015).…”

Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

“…In this scenario, the emergence of more ecologically viable synthetic methodologies to obtain these frameworks is desirable. Heteropolyacids (HPAs) are efficient catalysts in a series of chemical transformations [190] , [227] , [228] , [229] , [230] , and having that in mind, Dar et al ( Scheme 52 ) [231] have combined the properties of HPAs and clay - material with wide application in heterogeneous catalysis as solid supports [232] , [233] , [234] – in the development of a nanocatalyst (Nano-H 5 PV 2 W 10 O 40 ·10H 2 O/Clay) for the synthesis of β -phosphonomalononitriles ( 1 4 0 ). The MCR was carried out using benzaldehyde ( 1 ), malononitrile ( 9 ), and triethyl phosphite ( 1 3 9 ) under ultrasonication, at room temperature and solvent-free media.…”

Facile Construction of Sandwich-like TiO2-ZnO-ED-HPV Composite for Photodegradation of Ciprofloxacin

“…Due to their solubility in polar solvents they are widely used in catalysis. Improved decomposition of organic pollutants in UV / TiO 2 activity has been reported in the presence of supported keggin-type HPAs [17]. The significant increase in reactivity was justified by the semiconductor's ability to transfer electrons from the conduction group to the activated HPA* species.…”