Mang Changye, Li Guanghui, Rao Mingjun, Zhang Xin, Luo Jun, Jiang Tao
School of Minerals Processing and Bioengineering, Central South University, Bio-Building, RM 205, Changsha, 410083, Hunan, China.
Environ Sci Pollut Res Int. 2022 Jul;29(33):49739-49751. doi: 10.1007/s11356-022-19425-2. Epub 2022 Feb 26.
Accelerating the interfacial charge transfer process (ICTS) of the catalysts can immensely improve the photocatalytic efficiency. Doping transition metal ions not only promote the ICTS, but also boost multielectron reduction reactions of oxygen. Herein, birnessite-type MnO have been modified by different transition metal ions (TM = Zn, Cu, and Fe) in this work. Post-doping, Fe-Birnessite was featured by the highest photocatalytic HCHO oxidation activity with 80 ppm of HCHO which presented complete removal of HCHO for 80 min, while K-, Cu-, and Zn-Birnessite took 105, 135, and 170 min, respectively. In detail, the photoexcited electrons were caught by Fe (III) and then generated Fe (II),which could continue to capture photoexcited electrons to produce Fe (I) under visible light; on the other hand, the Fe (I) could be oxidized by O to obtain Fe (II) and then recover to Fe (III). This process tremendously improved the ICTS.
加速催化剂的界面电荷转移过程（ICTS）可极大提高光催化效率。掺杂过渡金属离子不仅能促进ICTS，还能推动氧的多电子还原反应。在此工作中，水钠锰矿型MnO已被不同过渡金属离子（TM = Zn、Cu和Fe）改性。掺杂后，铁水钠锰矿表现出最高的光催化HCHO氧化活性，对于80 ppm的HCHO，在80分钟内实现了HCHO的完全去除，而钾、铜和锌水钠锰矿分别需要105、135和170分钟。具体而言，光激发电子被Fe(III)捕获然后生成Fe(II)，在可见光下Fe(II)可继续捕获光激发电子生成Fe(I)；另一方面，Fe(I)可被O氧化得到Fe(II)然后恢复为Fe(III)。此过程极大地改善了ICTS。
