Degradation Of Phenanthrene By Zero-valent Iron And Its Bimetallic Nanoparticles

Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic, teratogenic, mutagenic, andpersistent organic pollutants, usually come from coal, oil and incomplete combustion oforganic polymer compound. As one of the most important groundwater pollutants, especiallybicyclic and tricyclic of PAHs attracted widespread attention because it’s solubility in watercan reach1-200μg/L, Explore effective environmental remediation technology to removalPAHs has been the focus of the research work. To solve the above problem, this paper selectPAHs typical representative-the phenanthrene as a target substance of pollutants. First choiceof three nano bimetallic system (nano Fe0, nano Fe/Ni, Fe/Cu) catalyst to do the activity, aftera series of kinetic experiments and gas chromatography-mass spectrometry verificationexperiment, then choice the Fe/Ni bimetallic to do depth. Determine the concentration of thephenanthrene during the reaction, to explore hydrogenation mechanism and kinetic model, toprovide a theoretical basis for the removal of polycyclic aromatic hydrocarbons ingroundwater environment.The main conclusions of this work are made of three parts as follows:1. batch experimental results show that, compared to the Fe/Cu, Fe/Ni having a higherreaction activity, and having a good catalytic hydrogenation effects of phenanthrene. Whenthe amount of Fe/Ni1.0g/L, phenanthrene removal efficiency of90%. The reaction rateincreased with increasing of temperature and nano-Fe/Ni bimetallic dosage, and decreasedwith increasing of initial concentration of phenanthrene, little correlation with the initial pHvalue.2. Characterization results show three freshly prepared double metal particles arespherical and, Fe/Ni, Fe/Cu metal surface is easy to be oxidized to form an oxide layer. Afterthe reaction, the bimetal comes into flake, occurred on the surface of the severely oxidized.X-ray photoelectron spectroscopy results showed that the nano-Fe/Ni bimetallic has core-shellstructure, the surface layer is iron oxide, Ni2+precipitation adsorbed on the surface of theoxide layer.3. MS analysis results showed that the three double metal can remove phenanthrene inthe water at room temperature and under atmospheric pressure, but only the Fe/Ni couldhydrogenation phenanthrene and have reaction product. The results showed that the mainproducts were9,10-dihydrophenanthrene,1,2,3,4,4a,9,10,10a-eta-hydrophenanthrene,1,2,3,4,5,6,7,8-oetahydrophenanthrene.