The photodegradation of NP was studied by Suntest-CPS+ photo simulator.
The degradation reaction of NP obeyed pseudo-first-order kinetics.
NO3− could accelerate the photodegradation of NP by a factor of more than 3.
The strong synergy between NO3− and HCO3− resulted in NP removal of 95% in only 30 min.
Fe3+ contributed little to the interaction in the combination with NO3− and HCO3−.