Heptanuclear Cadmium Borovanadate Containing a Sandwich-Type Anionic Partial Structure {B 20 V 12 } as a Heterogeneous Photocatalyst for the Reduction of CO 2 into CH 4

• Published in: Inorganic chemistry 2024-09, Vol.63 (35), p.16515-16522
• Main Authors: Feng, Yuquan, Wu, Junhao, Zhong, Zhiguo, Meng, Zhaohui, Chen, Shuyang, Liu, Kecheng
• Format: Article
• Language: English
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.4c02860

The novel heptanuclear cadmium borovanadate [Cd(en) ]{[Cd(H O)(en)] [B V O (OH) ]}·8H O (en = ethylenediamine) has been prepared under hydrothermal condition. It exhibits a 2D layered architecture that is built up from the [Cd(H O)(en)] coordination cations and new sandwich-type borovanadate anions [B V O (OH) ] constructed by BO , BO , BO (OH), and VO units. It features the first heptanuclear cadmium borovanadate containing the single valence of V cations and unique B/V ratio (B/V = 20/12). Its thermal, magnetic, XPS, and optical properties have been systematically studied. The (2.60 eV), (1.69 eV), and (-0.91 eV) were well determined by the UV-vis diffuse reflectance spectrum, UPS curve, and the formula = - , respectively. The photocatalytic experiments revealed that the borovanadate could be selected as an effective and stable heterogeneous catalyst for the reduction of CO to CH by means of visible light (the amount for CH gas could reach 50.57 μmol·g ·h when the reaction time was 3 h). The recycling experiment and photocatalytic mechanism were also well investigated and established in detail.