Elimination of atrazine through radical/non-radical combined processes by manganese nano-catalysts/PMS and implications to the structure-performance relationship

•The generation of Mn(III) and Mn(II) is crucial for peroxymonosulfate activation;•Multiple reactive species including radicals and non-radical were involved;•The formation of BrO3− is inhibited in α-MnO2 nanowires/peroxymonosulfate process;•Sixteen intermediates were detected during the degradation of atrazine.