Iron Porphyrin / Bismuth Tungstate Composite Photocatalyst

As a kind of commonly used methyl orange dye, in its use during 10% ~ 20% were discharged into the water environment, and the toxicity of wastewater containing methyl orange, contain carcinogenic, mutagenic, teratogenic substances; high chroma, inhibition of photosynthesis in aquatic system; high COD value, will lead to water eutrophication.

Photocatalytic degradation is an advanced oxidation process, which can effectively degrade methyl orange under sunlight irradiation, and the photocatalytic material can be recycled and reused. It will not remain in the wastewater for two times. Bismuth tungstate (Bi₂WO₆) is a photocatalytic material with visible light response. Because of its suitable band gap, relatively high optical stability, unique crystal structure and green and non-toxic properties, bismuth tungstate is widely used in photocatalysis.

A compound modification of iron porphyrin with organic compounds has been put forward by some scholars. This method has a good degradation effect on methyl orange, and is a widely used method for treating methyl orange.

1.Ferric porphyrin was dissolved in a mixed solution of acetonitrile and two methyl sulfoxide, and the iron porphyrin solution was obtained. The volume ratio of the nitrile to the two DMSO was 1: 1~2;

2.The bismuth tungstate is dissolved in the iron porphyrin solution, stirred at a rotation speed of 400 r/min to 1500 r/min for 5 min to 30 min, and sonicated for 5 min to 30 min to obtain a mixed solution of bismuth tungstate and iron porphyrin;

3.The pH value of the mixed solution of bismuth tungstate and iron porphyrin is adjusted, and the composite photocatalyst of iron porphyrin / bismuth tungstate is obtained.

The experimental results show that the surface of the composite photocatalyst with iron porphyrin / bismuth tungstate will react with dissolved oxygen to form strong hydroxyl radicals and superoxide free radicals, which can also oxidize and degrade methyl orange, and then efficiently degrade methyl orange.

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