电化学反应器中Fenton试剂分解4-硝基酚动力学

以4-硝基酚为处理对象，在电化学反应系统中考察了Fenton试剂投加量，亚铁离子与过氧化氢的摩尔比(Fe²⁺/H₂O₂) ，初始pH值和过氧化氢投加时间等因素对4-硝基酚分解速率的影响。电化学处理系统由圆筒型电解槽和贮槽组成，并分别视为平推流反应器(PFR)与全混式反应器(CSTR)，由此建立相应的数学模型。通过模型可确定4-硝基酚分解的准一级反应速率常数。结果显示，当(Fe²⁺/H₂O₂)一定时，准一级反应速率常数随着Fenton试剂投加量的增加而增加；而Fenton试剂投加量一定时，过氧化氢的快速投加能提高准一级反应速率常数；对准一级反应速率常数存在最佳的(Fe²⁺/H₂O₂)比值或初始pH值。

Kinetics of 4-nitrophenol decomposition by Fenton's reagent in flow electrochemical reactor

4-Nitrophenol was decomposed by Fenton’s reagent in a flow electrochemical reactor, and the effects of Fenton’s reagent dosage, molar ratio of Fe(Ⅱ) to H₂O₂, initial pH, and H₂O₂ feeding time on the removal rate of 4-nitrophenol were investigated.The reaction system was modeled as a plug flow reactor (PFR) in series with a continuous stirred tank reactor (CSTR), and the pseudo-first order rate constant of 4-nitrophenol removal was determined from the model.The pseudo-first order rate constant increased with the increase of Fenton’s reagent dosage at a fixed molar ratio of Fe(Ⅱ) to H₂O₂, but decreased with the increase of H2O2 feeding time at a fixed Fenton’s reagent dosage.There existed an optimal molar ratio of Fe(Ⅱ) to H₂O₂ or initial pH for the pseudo-first order rate constant of 4-nitrophenol removal.