中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 11 November 2024 |
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
3. Hunan Province Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, China;
4. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:In order to address the issue that the photocatalytic reduction of hexavalent chromium (Cr(VI)) is often limited by the inefficient utilization of electrons in photocatalysts, a quasi-MOF photocatalyst using thiocyanate (—SCN) was developed as a modulator to enhance the charge transfer properties of ZIF-L-based photocatalysts. The incorporation of —SCN introduced structural defects, which improved visible light absorption and the reduction ability of photogenerated electrons. —SCN significantly adjusted the electronic properties and established a stable electron release pathway, serving as active sites for reduction. The optimized quasi-MOF demonstrated a Cr(VI) reduction rate of 94.8% in neutral potassium thiocyanate solution under visible light without a hole scavenger. The reaction rate constant is 2.8 times that of the photocatalyst without defect modulation. This study offers a promising strategy for developing highly efficient photocatalysts for environmental remediation.
Key words: quasi-MOF; polar ligand; photocatalysis; hexavalent chromium reduction
