Effect of alkalinity on degradation of p-Nitrophenol by UV-Fention reagent

The effects of initial pH and alkalinity on the degradation of p-Nitrophenol(p-NP) by UV/Fention process was investigated.The results showed that,acidic conditon(pH was 3-5) benefited the degradation of p-NP,however,in weak alkaline condition,the degradation speed decreased obviously;the ·OH free radical reaction could be inhibited by carbonate,the degradation speed of p-NP decreased with the increase of HCO3-concentration.By comparing the effects of HCO3-on degradation of p-NP at different initial pH,it was found that,as the varision of the solution pH could affect the existing formation of HCO3-,and thereby change the inhibiting performance of it on p-NP degradation,the influence of carbonate could be decreased or even eliminated through controlling the solution pH.