Details

Autor(en) / Beteiligte

• Gil-Gavilán, Dolores G
• Cosano, Daniel
• Amaro-Gahete, Juan
• Castillo-Rodríguez, Miguel
• Esquivel, Dolores
• Ruiz, José R
• Romero-Salguero, Francisco J

Titel

Zn-Cr Layered Double Hydroxides for Photocatalytic Transformation of CO[sub.2] under Visible Light Irradiation: The Effect of the Metal Ratio and Interlayer Anion

Ist Teil von

• Catalysts, 2023-10, Vol.13 (10)

Ort / Verlag

MDPI AG

Erscheinungsjahr

2023

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Carbon dioxide is the main gas responsible for the greenhouse effect. Over the last few years, the research focus of many studies has been to transform CO[sub.2] into valuable products (CO, HCOOH, HCHO, CH[sub.3]OH and CH[sub.4]), since it would contribute to mitigating global warming and environmental pollution. Layered double hydroxides (LDHs) are two-dimensional materials with high CO[sub.2] adsorption capacity and compositional flexibility with potential catalytic properties to be applied in CO[sub.2] reduction processes. Herein, Zn-Cr LDH-based materials with different metal ratio and interlayer anions, i.e., chloride (Cl[sup.−]), graphene quantum dots (GQDs), sodium dodecyl sulfate (SDS) and sodium deoxycholate (SDC), have been prepared by a co-precipitation method and characterized by different techniques. The influence of the interlayer inorganic and organic anions and the metal ratio on the application of Zn-Cr LDHs as catalysts for the photocatalytic CO[sub.2] reduction reaction under visible light irradiation is unprecedentedly reported. The catalytic tests have been carried out with Ru(bpy)[sub.3] [sup.2+] as photosensitizer (PS) and triethanolamine as sacrificial electron donor (ED) at λ = 450 nm. All LDHs materials exhibited good photocatalytic activity towards CO. Among them, LDH3-SDC showed the best catalytic performance, achieving 10,977 µmol CO g[sup.−1] at 24 h under visible light irradiation with a CO selectivity of 88%. This study provides pertinent findings about the modified physicochemical features of Zn-Cr LDHs, such as particle size, surface area and the nature of the interlayer anion, and how they influence the catalytic activity in CO[sub.2] photoreduction.