Combination of piezoelectric additives and ball milling for high-efficiency degradation of organic dye in solid state

The combination of piezoelectric material and ball milling leads to new frontiers in catalysis research. Here we used piezoelectric BaTiO 3 nanoparticles as the additive for the degradation of dye pollutant in solid state in ball milling process. With the assistant of ppm level CuBr 2 and H 2 O 2 , high degradation conversion (> 99%) of dyes can be achieved in short time (10 min). BaTiO 3 nanoparticles became temporarily highly polarized particles during BM process and generated electron-hole. These particles exhibited strong reducing properties and reduced Cu(II) into the active Cu(I) species which can catalyze H 2 O 2 to generate highly active ·O 2– to enhance the dye degradation. In addition to the general applicability for different dyes and larger scales, this BaTiO 3 assist BM process was deduced to be a promising powerful platform for organic pollutant treatment in solid states.