Abstract
Using FeCl3 and FeSO4 as precursors, Fe3O4 were prepared by co-precipitation method via FeCl3 and FeSO4 aqueous solutions successively added to NaOH solution. The sample was proved by X-ray powder diffraction, transmission electron microscope, ultraviolet–visible spectrophotometry and magnetic measurement. The results showed that the prepared Fe3O4 material was composed of an average diameter of about 15 nm particles and nano rods with well-crystallized magnetite and stronger superparamagnetic, getting a saturation magnetization of 49.5 emu g−1. This Fe3O4 material was found to be an effective catalyst for photodegradation of naphthalene with or without H2O2 under visible light irradiation, getting 81.1% and 74.3% degradation rate in these two cases, respectively. The degradation pathway in the absence and presence of H2O2 was analysed via measurement of the distribution of degradation products by GC-MS and adsorption of reactants on the surface of the catalyst by in situ DRIFTS spectra.
Highlights
Polycyclic aromatic hydrocarbons (PAHs) that consist of two or more condensed benzene rings are primarily formed from the incomplete combustion or pyrolysis of organic materials such as petroleum, gas, coal and wood [1]
An amount of 10 ml of naphthalene solution (0.2 mmol of naphthalene dissolved in 100 ml ethanol þ 100 ml deionized water), 90 ml of deionized water and 0.3 g of Fe3O4 were added to a quartz columnar reactor fitted with a magnetic stirrer
In order to explore the degradation mechanism, in situ DRIFTS spectra of the naphthalene and H2O2 adsorbed on the catalyst surface were measured at 508C, as shown in figure 12
Summary
Polycyclic aromatic hydrocarbons (PAHs) that consist of two or more condensed benzene rings are primarily formed from the incomplete combustion or pyrolysis of organic materials such as petroleum, gas, coal and wood [1] These compounds have recently attracted a lot of attention in studies on water, soil and air pollution due to their highly carcinogenic, mutagenic and teratogenic potential [2]. The removal of PAHs via photodegradation catalysed by heterogeneous semiconductor catalysts has been widely developed These semiconductor catalysts involving TiO2, ZnO, SnO, WO3, Al2O3 and their modified nanomaterials exhibited efficiently photocatalytic activities for degradation of PAHs [6,7,8,9].
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