Enhancing Photocatalytic Performance of NH2-UIO66 by Defective Structural Engineering

• 作 者: Zhenmin Xu Jiazhen Cao Xiang Chen Liyi Shi Zhenfeng Bian
• 机 构: Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China;The Educ
• 出 处: 天津大学学报（英文版）
• 发表日期: 2021年2期
• 关键词: NH2-UIO66 Defective structure Efficient LMCT Photocatalysis Cr(Ⅵ) reduction

NH2-UIO66 (NU) is a promising photocatalyst for the reduction of Cr(Ⅵ) to low-toxic Cr(Ⅲ) driven by visible light under ambient conditions.However,the main limitation in this process is the inefficient ligand to metal charge transfer (LMCT) of photo-excited electrons,which is caused by inherent energy gap (△ELMCT).This study synthesized the defective NU (NUX-H,where X is the molar equivalent of the modulator) with reduced △ELMCT through linkers removal via acid treatment.The electronic structure of NUX-H was systematically investigated,and the results indicated that the structural defects in NUX-H strongly altered the environment of the Zr atoms.Furthermore,they substantially lowered the energy of the unoccupied d orbitals (LUMO),which was beneficial to efficient LMCT,resulting in an improved photocatalytic activity of NUX-H toward high-concentration (100 mg/L) Cr(Ⅵ) reduction.Compared to NU with defect-free structure,the reducing rate of Cr(Ⅵ)was increased by 47 times.This work introduced an alternative strategy in terms of designing efficient photocatalysts for reducing Cr(Ⅵ) under ambient conditions.