Feasibility study on the synthesis of nano zero-valent iron,supported biochar materials and related composite catalysts
Advanced oxidation technology of persulfate has been widely used in petroleum hydrocarbon contamination of soil events.Nano zero-valent iron can be used as catalyst to improve the oxidation capacity and efficiency of persulfate.Biochar(BC)loaded with nano-zero(nZVI)ferric can reduce the agglomeration and oxidation of nano-zero ferric.Bc-nZVI was pre-pared by liquid phase reduction method.The apparent morphology,structural morphology and functional groups of nZVI and BC-nZVI were observed by scanning electron microscopy,transmission electron microscopy and Fourier infrared spectroscopy.The experimental results show that biochar can effectively prevent the agglomeration phenomenon of nano zero-valent iron,and pro-vide the dispersion ability of nano zero-valent iron.The modified biochar is more conducive to the adhesion of zero-valent iron nanoparticles by increasing the specific surface area.The research results have a certain reference value for selecting catalysts for remediation of petroleum hydrocarbon polluted soil by advanced persulfate oxidation technology in practical engineering.
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