Luévano-Hipólito E, Fabela-Cedillo Mayte G, Torres-Martínez Leticia M, Zarazúa-Morín María E
CONACYT - Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil-Departamento de Ecomateriales y Energía, Cd. Universitaria, C.P. 66455, San Nicolás de los Garza, NL, Mexico.
Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil-Departamento de Ecomateriales y Energía, Cd. Universitaria, C.P. 66455, San Nicolás de los Garza, NL, Mexico.
Heliyon. 2023 Jun 19;9(6):e17426. doi: 10.1016/j.heliyon.2023.e17426. eCollection 2023 Jun.
Photocatalytic CO reduction is an alternative technology to the depletion of highly pollutant fossil fuels through the generation of renewable solar-based fuels. This technology requires that the photocatalysts be obtained directly from nature to scale up the process. Taking that into consideration, this work proposed the fabrication of sodium iron titanate (NaFeTiO) photocatalysts from earth-abundant ilmenite mineral. The photocatalysts exhibited full spectrum light response, good electron transfer due to its unique tunnel structure that favored the formation of rod-like morphology. These properties promoted the solar-driven CO reduction to generate formic acid (HCOOH) with high selectivity (157 μmol g h). It was found that higher synthesis temperatures promoted the formation of Fe species, which decreased the efficiency for CO reduction. Also, the possibility of reduced the CO molecules in the air was studied with the NaFeTiO samples, which resulted in an efficiency of up to 93 μmol g h of HCOOH under visible light. The stability of the solar-driven CO reduction with the NaFeTiO photocatalysts was confirmed after seven days of continuous evaluation.
光催化CO还原是一种通过生成基于太阳能的可再生燃料来替代消耗高污染化石燃料的技术。该技术要求直接从自然界获取光催化剂以扩大该工艺规模。考虑到这一点，这项工作提出了由储量丰富的钛铁矿矿物制备钛酸钠铁（NaFeTiO）光催化剂。这些光催化剂表现出全光谱光响应，由于其独特的隧道结构有利于棒状形态的形成，因而具有良好的电子转移性能。这些特性促进了太阳能驱动的CO还原，以高选择性（157 μmol g⁻¹ h⁻¹）生成甲酸（HCOOH）。研究发现，较高的合成温度促进了Fe物种的形成，这降低了CO还原效率。此外，还研究了用NaFeTiO样品还原空气中CO分子的可能性，结果在可见光下HCOOH的生成效率高达93 μmol g⁻¹ h⁻¹。经过七天的连续评估，证实了NaFeTiO光催化剂用于太阳能驱动CO还原的稳定性。
