Degradation of 1,4-dioxane by biochar supported nano magnetite particles activating persulfate.
Nano magnetite biochar composite (nFe3O4/biochar) was synthesized and used to activate persulfate for the degradation of 1,4-dioxane. Analytical techniques using X-ray diffraction (XRD), fourier transform infrared analysis (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) indicated that nFe3O4 was spherical and successfully loaded onto the surface of biochar. The results of batch-scale experiments illustrated that the 1,4-dioxane degradation efficiency in aqueous phase was 98.0% after 120 min reaction with the composite mass ratio of 1:1 between nFe3O4 and the pine needle biochar pyrolyzed at 400 °C (P400) under the initial neutral pH. An electron paramagnetic resonance (EPR) study, free radical quenching experiment and XPS analysis were undertaken to illustrate the mechanism of persulfate activation by nFe3O4/biochar. Under acidic and neutral conditions, the predominant free radical was SO4- whereas OH and SO4- predominated when the initial pH was 9.0. The XPS analysis indicated that Fe(II) and oxygenated functional groups activated persulfate. In addition, carbon-carbon double bonds would be transformed into ketone and quinone which could activate persulfate during the reaction.
['Ouyang|Da|D|', 'Yan|Jingchun|J|', 'Qian|Linbo|L|', 'Chen|Yun|Y|', 'Han|Lu|L|', 'Su|Anqi|A|', 'Zhang|Wenying|W|', 'Ni|Hao|H|', 'Chen|Mengfang|M|']
D002606:Charcoal D004146:Dioxanes D052203:Ferrosoferric Oxide D005609:Free Radicals D008855:Microscopy, Electron, Scanning D053758:Nanoparticles D056951:Photoelectron Spectroscopy D013431:Sulfates D014961:X-Ray Diffraction
1,4-Dioxane Biochar Nano magnetite Activation Persulfate Pine needle