Chromium-doped magnetite hetero-phase Fenton catalyst and preparation method for same

Abstract

The invention provides a chromium-doped magnetite hetero-phase Fenton catalyst and a preparation method of same. The catalyst is Fe<2.5>Cr<0.5>O4 and is prepared through a co-precipitation method. The method includes the following steps: 1) according to the molar ratio of Fe<2+>:Cr<3+> = 2.5:0.5, dissolving ferrous salt and chromium nitrate nonahydrate to obtain a metal ion mixed solution; 2) diluting an alkali solution twice, of which the volume is 1 / 4 of the metal ion mixed solution, and rapidly pouring the metal ion mixed solution into the alkali solution and performing a stirring reaction; and 3) after the stirring reaction is completed, repeatedly centrifuging the reaction product, washing, drying and grinding the product, and calcining the product at 400 DEG C for 3 h. The chromium-doped magnetite Fe<2.5>Cr<0.5>O4 has a cubic system spinel structure. The Fe<2.5>Cr<0.5>O4 has good degradation effect and high removal effect on anionic dye wastewater under neutral condition. In addition, the Fe<2.5>Cr<0.5>O4, under external magnetic field, can be rapidly separated, thereby achieving reuse of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of dye wastewater treatment and environmental catalysis, and in particular relates to a chromium-doped magnetite heterogeneous Fenton catalyst and a preparation method thereof. Background technique [0002] As an advanced oxidation process, the Fenton method has many advantages in the treatment of dye wastewater, such as non-selective reaction, mild reaction conditions, and simple operation. However, the traditional homogeneous Fenton method has some disadvantages, such as: a narrow pH range, a large amount of iron sludge is produced after the reaction, causing secondary pollution, Fe 2+ / Fe 3+ The ions will increase the chromaticity of the effluent, and it is difficult to realize the separation and reuse of the catalyst, which limits its application in wastewater treatment. The heterogeneous Fenton process using iron oxide as a catalyst has gradually received attention because of its high reactivity, immo...

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Problems solved by technology

The cationic dye methylene blue (MB) is often used to study the catalytic activity of doped magnetite Fenton. The research results show that titanium doping can significantly improve the efficiency of catalytic degradation of MB by magnetite Fenton. However, the type of pollutant itself has no effect on the catalytic oxidation effect. The impact of

Most doped magnetite is not ideal for decolorization and degradation of anionic dyes under neutral conditions

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