A State-of-the-Art of Metal-Organic Frameworks for Chromium Photoreduction vs. Photocatalytic Water Remediation.

Hexavalent chromium (Cr(VI)) is a highly mobile cancerogenic and teratogenic heavy metal ion. Among the varied technologies applied today to address chromium water pollution, photocatalysis offers a rapid reduction of Cr(VI) to the less toxic Cr(III). In contrast to classic photocatalysts, Metal-Organic frameworks (MOFs) are porous semiconductors that can couple the Cr(VI) to Cr(III) photoreduction to the chromium species immobilization.

Chromium Speciation in Zirconium-Based Metal-Organic Frameworks for Environmental Remediation.

Acute Cr water pollution due to anthropogenic activities is an increasing worldwide concern. The high toxicity and mobility of Cr makes it necessary to develop dual adsorbent/ion-reductive materials that are able to capture Cr and transform it efficiently into the less hazardous Cr . An accurate description of chromium speciation at the adsorbent/ion-reductive matrix is key to assessing whether Cr is completely reduced to Cr , or if its incomplete transformation has led to the stabilization of highly reactive, transient Cr species within the material.