Environmentally-friendly harvesting TiO2 nanospheres and V2O5 microrods from spent selective catalytic reduction catalysts

Spent selective catalytic reduction (SCR) catalysts are defined as hazardous wastes because of the toxicity V2O5 to ecological environment. Recycling and TiO2 from spent SCR has strikingly social environmental benefits well economic values. In this work, a “NaOH ?+ ?Na2CO3” system was employed recycle 99.2% anatase/rutile nanospheres with nanospherical morphology by simple sintering-leaching process. The observed photocatalytic performance higher than that other recovered catalysts, commercial TiO2, chemosynthetic which can be ascribed enhanced separation photo-excited electron/hole in direct Z-scheme homostructures. Additionally, high-purity microrods high H2S removal were efficiently prepared hydrothermal method leaching solution, is superior traditional including NH4VO3 precipitation solvent extraction present vanadate low-grade filtrate 99.6% recovery rate. This study develops an alternative for controlling pollution soil water recycling valuable metals.