Performance of heterogeneous Fenton-like system for degradation of nitrobenzene-containing wastewater

A heterogeneous Fenton-like catalytic system,consisted of 3A-Fe zeolite catalyst that was prepared in the laboratory and characterized by SEM,EDS and XRD,and H2O2 was used for degradation of nitrobenzene-containing wastewater.The effects of pH,H2O2 and nitrobenzene concentration,and catalyst dose on degradation of nitrobenzene were studied.An attempt to reveal the degradation mechanism was also done.The results showed that nitrobenzene had been significantly degraded in this Fenton-like system provided that pH value of wastewater was in the range of 2 to 10.No dissolved Fe(Ⅱ/Ⅲ) was detected for the Fenton-like system,indicating that nitrobenzene was directly degraded on surface of 3A-Fe zeolite catalyst rather than by the aqueous Fenton system.The 3A-Fe zeolite catalyst exhibited good stability in repeat use and the degradation rate of nitrobenzene could reach 94.1%,and the removal rate of CODCr and TOC,under the optimal conditions,were 78.6% and 60.5% respectively.