【摘要】 为了解决六价铬的光催化还原常常受到光催化剂中电子利用效率不高的问题，开发了一种使用硫氰酸基(—SCN)作为调节剂合成的准金属有机框架光催化剂，以增强光催化剂的电荷转移特性。—SCN引入结构缺陷，改善可见光吸收和光生电子的还原能力。—SCN显著调整电子特性，并建立稳定的电子释放路径，充当还原的活性位点。在中性硫氰酸钾溶液中，优化后的光催化剂在可见光下无需添加空穴捕获剂就能实现94.8%的Cr(Ⅵ)还原率。反应速率常数是未经缺陷化处理的光催化剂的2.8倍。这项研究提供了一种用于开发环境修复的高效光催化剂的有效策略。更多还原

【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.更多还原