Effect of Zn2Cr layered double hydroxide on photocatalytic hydroxylation of terephthalic acid and photodegradation of sodium diclofenac

Author(s)

Sotiles, Anne Raquel ; Barbosa, Lorrana Vietro ; Vedovato, Yan Pita ; Wypych, Fernando ; Faria, Emerson Henrique de

• Document type: Journal article
• Source: CATALYSIS TODAY; v. 423, p. 11-pg., 2023-11-01.

Abstract

Titanium dioxide has been widely used in traditional photocatalysis but layered double hydroxides (LDHs) based on Zn/Cr have attracted interest due to their semiconducting properties and tunable bandgap. The typical layered particle morphology of LDHs can result in interesting physicochemical properties, like the properties of traditional bulk semiconductors. The present manuscript describes the synthesis, characterization, and photocatalytic investigation of Zn2Cr LDHs intercalated with Ac-, I-, Br-, F-, Cl- and NO3- . Samples containing SO42-/Na+ were also obtained by coprecipitation at constant and increased pH. The photocatalytic activity was initially investigated using terephthalic acid as a model reaction, and only the LDHs intercalated with SO42-/Na+ could promote the formation of 2-hydroxy terephthalic acid. The two selected photocatalysts intercalated with SO4 2-/ Na+, prepared under different conditions, were investigated regarding photocatalytic degradation of the emerging organic contaminant sodium diclofenac. Promising results were obtained specially after the recycling of the photocatalysts, which kept almost the same catalytic activity after six cycles of use. (AU)

• FAPESP's process: 17/15482-1 - Novel strategies synthesis to reuse Tanner industry by-products to obtain high-value functional porous materials
• Grantee: Emerson Henrique de Faria
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/09823-4 - Use of the europium III to reveal structure of the matrices obtained by sol-gel methodology
• Grantee: Eduardo José Nassar
• Support Opportunities: Regular Research Grants