碱度对UV-Fenton法降解对硝基苯酚的影响

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

考察了溶液初始pH值和碱度对UV-Fenton法降解对硝基苯酚(p-NP)效果的影响。结果表明,酸性条件(pH值3～5)有利于p-NP的降解,而在偏碱性条件下其降解速率明显减缓;碳酸盐能掩蔽.OH自由基反应:p-NP降解速率随着HCO3-浓度的增加而变慢。通过比较不同pH值下HCO3-对p-NP降解效果的影响发现,由于pH值的变化会影响HCO3-在溶液中的存在形态,从而改变其对p-NP降解的抑制作用,通过控制溶液pH值可以降低或消除碳酸盐的影响。

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.