Constructing 3D sandwich-like structured Ti foam/TiO2−x/SnO2-Sb composite electrodes for the degradation of PPCPs
Anqi Li, Xuening Bai, Yuting Xie, Hebin Bao, Yu Yang, Miao He, Wen Yang, Qiwen Zhang, Yunhuai Zhang, Xueming Li
Abstract
The fabrication of Sb-doped SnO 2 electrode with high catalytic activity and excellent durability for decomposition PPCPs (Pharmaceuticals and personal care products, PPCPs) is challenging. Herein, a Ti 3+ /O vs -related TiO 2−x is prepared by short-time annealing at low temperature in mixed gas with Zr as a cocatalyst. DFT calculations indicate that the introduction of Ti 3+ /O vs defects could promote the formation of more ·OH. Then, the nanoflower rod-like SnO 2 -Sb catalytic layer supported on dual-defects TiO 2−x is successfully synthesized by one-step pulse electrodeposition (PLED) combined with hydrothermal methods (H). This newly pulse electrodeposition technique solves the short lifetime problem of SnO 2 -Sb nanoflower electrodes current hydrothermal-based methods. 1 O 2 and ·OH are found to be the primary reactive oxygen species (ROSs) by radical quenching tests and electron paramagnetic resonance analysis. The optimized Ti foam/TiO 2−x /SnO 2 -Sb electrode could degrade over 96.3 % of 20 mg L −1 amoxicillin (AMX) within 30 min, corresponding kinetic constant 0.10228 min −1 . This will provide inspiration for the construction of defect engineering and new insights for the development of low-cost and high electrooxidation activity Sb-doped SnO 2 electrode.