A Review of Photocatalytic Water Purification with Metal Organic Frameworks

Abstract

This review analyzes the preparation and characterization of metal organic frameworks (MOFs) and their application as photocatalysts for water purification. The study begins by highlighting the problem of water scarcity and the different solutions for purification, including photocatalysis with semiconductors such as MOFs. It also describes the different methodologies that can be used for the synthesis of MOFs, paying attention to the purification and activation steps. The characterization of MOFs and the different approaches that can be followed to learn on the photocatalytic processes are also detailed. Finally, the work reviews literature focused on the degradation of contaminants from water using MOF-based photocatalysts under light irradiation.

Multivariate Functionalization of UiO‐66 for Photocatalytic Water Remediation

“…Nowadays, there are many studies that have enhanced either Cr VI adsorption or photocatalytic performance of pre‐ or postsynthetically modified Zr‐UiO‐66 frameworks. [ 39,40 ] For example, amino and dihydroxyl functionalization endow UiO‐66 with chemical (i.e., (OH) 2 ) and photocatalytic (i.e., NH 2 ) capacity to reduce Cr VI to Cr III , [ 14,21 ] as well as with the chemical affinity to adsorb both Cr VI (i.e., ‐NH 2 ) and Cr III (i.e., (OH) 2 ). However, as concluded from X‐ray diffraction (XRD) data, both UiO‐66‐NH 2 , UiO‐66‐(OH) 2 lack the chemical robustness to work under highly acidic or caustic conditions that only the nitro functionalized UiO‐66‐NO 2 can tolerate (Scheme 1b).…”

Effect of pH on the Performance of Bi2O2CO3 Nanoplates for Methylene Blue Removal in Water by Adsorption and Photocatalysis

“…Besides, the photocatalytic efficiency of the materials is affected by environmental conditions such as temperature, pH, concentration, exposure time, and light intensity [8]. In particular, the pH value greatly affects the treatment efficiency of a photocatalytic process because the ions to be treated will transform into different forms and the material properties are also affected when the pH changes [14]. However, there has not been a report about the pH effect on the abilities of adsorption and photocatalysis of MB using Bi2O2CO3 nanoplates.…”

Optimization of Conditions for Removal Phenolic Compounds from Water by a Graphene Oxide Aerogel

“…As a result, creating a novel material that can adsorb many types of phenolic compounds at the same time is proved to be a great challenge. Many adsorbents, such as nanocellulose, carbon nanotubes, metal‐organic frameworks, metal oxides, graphene, and its derivatives have been reported to remove phenolic compounds from wastewater [16–20] . Graphene oxide (GO) has gotten great interest because of its excellent properties, including high specific surface area, mechanical flexibility, photocatalytic, thermal, and chemical properties of many materials.…”