pH-dependent transformation products and residual toxicity evaluation of sulfamethoxazole degradation through non-radical oxygen species involved process

•Radical/non-radical combined system was employed for sulfamethoxazole degradation.•Contribution from reactive species to sulfamethoxazole degradation was evaluated.•Generation of BrO3− is inhibited in the presence of Br−.•Detoxification and degradation pathway of sulfamethoxazole was pH dependent.