Hierarchical alpha-Fe2O3/TiO2 hollow sphere dual-functional photocatalyst and application thereof

Abstract

The invention provides a hierarchical alpha-Fe2O3 / TiO2 hollow sphere difunctional photocatalyst. The alpha-Fe2O3 / TiO2 hollow sphere difunctional photocatalyst with a hierarchical structure is prepared by virtue of hydrothermal reaction from FeOOH as a substrate, and butyl titanate, titanium tetrachloride, titanyl sulfate or isopropyl titanate as a titanium source; next, the alpha-Fe2O3 / TiO2 hollow sphere difunctional photocatalyst is dispersed in water containing heavy metal ions and adsorption and light-catalyzed reaction are performed under the irradiation of simulated sunlight. The invention also provides new application of the hierarchical alpha-Fe2O3 / TiO2 hollow sphere difunctional photocatalyst in treating of heavy metal ion pollution in the water.

Description

technical field [0001] The invention relates to the field of inorganic functional materials, in particular to a graded α-Fe 2 o 3 / TiO 2 Preparation method of hollow spherical bifunctional photocatalyst and its application in treating heavy metal ion pollution in water. Background technique [0002] In my country, with the rapid economic development of coastal areas and the high concentration of population and industries, a large amount of wastewater containing heavy metal ions flows into the ocean. The wanton discharge of these pollutants exceeds the purification capacity of the ocean itself, resulting in pollution near the mainland bay. . Heavy metals (heavy metals refer to density greater than 5g / cm 3 The heavy metals referred to in terms of environmental pollution mainly refer to Zn, Cu, Hg, Cr, Cd, Pb, etc., which have significant biological toxicity) because of their special chemical, geochemical properties and toxic effects, they are called environmental pollutants...

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Problems solved by technology

Some reports about TiO 2 Photocatalytic oxidation or reduction of heavy metal ions, for example: Song Han et al. use TiO 2 Photocatalytic direct reduction of Cr(VI)[Environmental Science, 2006,27(5):913-917]; Li Shuben et al reported the use of TiO in the presence of organic matter 2 Indirect photocatalytic reduction of Cr(VI)[Acta Physicochemical Sinica, 1997(2):106-112]; Fu et al. reported that TiO 2 Photocatalytic oxidation of heavy metal ions in water by using the prepared mesoporous α-Fe 2 o 3 / TiO 2 Simultaneous adsorption and photocatalytic oxidation of highly toxic As(Ⅲ) in water. Studies have shown that the material can quickly adsorb highly toxic As(Ⅲ) in water and oxidize it to low-toxic As(Ⅴ), which can be recycled more than 8 times. It still maintains good adsorption and photocatalytic oxidation properties, and has good stability in water treatment applications [J.Phys.Chem.C 2008,112,19584–19589]; Zhang et al. reported that in N 2 Atmosphere, Pb(Ⅱ) in TiO 2 Photocatalytic reduction of nanocrystalline surfaces [Thin Solid Films 518 (2010) 6006–6009]; visible, TiO 2 Some research progress has been made on the photocatalytic oxidation or reduction of heavy metals in water, but there are still some problems that make it difficult for practical applications, for example, (1)TiO 2 The powder is not conducive to recycling, the photocatalysis or reduction efficiency of recycling is reduced, and the adsorption efficiency is low; (2) TiO 2 It is not easy to precisely control the morphology, and the novel morphology of TiO 2 The preparation of photocatalysts remains to be explored; (3) TiO 2 The development of composite multifunctional photocatalysts is still immature, how to maintain TiO after composite 2 Higher photocatalytic performance is still under development

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