Degradation Of Diuron By Nanoscale Zero Valent Iron Supported On Activated Fcarbon Fibre

Pesticide diuron belong to the phenyl urea herbicide, is widely used to improvecotton, beans, tomatoes and tobacco crop yields. Unlike conventional pollutants, it is akind of chloric substituent organic compounds, due to the occurrence of chlorinatedgroup it has a strong toxicity and re-biological degradation, therefore it hasenvironmental persistence, bioaccumulation and long-distance migration ability,caused serious harm to human health and ecological environment. Due to technicaland economic reasons, zero-valent iron is widely used in the degradation of diuron.In this paper, activated carbon fiber (ACF) were selected as the carrier ofnanoscale zero valent iron (NZVI) for diuron degradation. The composite ofnano-zero valent iron supported on activated carbon fiber (NZVI/ACF) wascharacterized by X-ray Diffraction (XRD) and scanning electron microscope (SEM),found as a carrier ACF can effectively solve the problem of the reunion of nanometeriron, iron nanoparticles evenly dispersed on the surface of activated carbon fiber. Theeffects of initial solution pH and initial concentration of diuron were investigated. Theproduct of reduction was analyzed and also investigated removal efficiency of diuronusing hydrogen peroxide (H2O2) combined NZVI/ACF technology. The conclusionsare as following:(1)Activated carbon fiber as a solid matrix load nano-iron activated carbon fiber,synergies between activated carbon fiber adsorption and nanometer iron reductionsignificantly increased the removal rate of diuron.(2)The efficiency to reduce diuron by NZVI/ACF is always higher than by NZVIin different initial concentration of diuron. And can efficiently remove diuron on awide range of pH, have a good pH adaptability. In addition, the removal efficiencywas also found increasing with the decreases of pH.(3)According to the GC-MS analysis of reaction products, the degradationproducts of diuron by NZVI/ACF/H2O2was biodegradable N-ethyl propylene amide,compared to styrene, the degradation products by NZVI, diuron degraded byNZVI/ACF/H2O2more thoroughly. At last, we select rice husk char as solid substrate, carried out some experimentsto degrade diuron by the rice husk char and the rice husk char load nano-iron.