Preparation method of titanium dioxide doped carbon-iron composite material for photo-degrading perfluorinated organic acid

Abstract

The invention relates to a preparation method of a titanium dioxide doped carbon-iron composite material for photo-degrading perfluorinated organic acid. Nano-sized titanium dioxide and nano iron carbonyl are fixed on particle activated carbon, and then the titanium dioxide doped carbon-iron composite material is added into a perfluorinated organic acid solution and is used for degrading the perfluorinated organic acid under the catalytic action of ultraviolet light. The perfluorinated organic acid is adsorbed by using the nano iron carbonyl and the particle activated carbon in the titanium dioxide doped carbon-iron composite material, and the perfluorinated organic acid adsorbed onto the material is photo-catalytically degraded under the action of added media such as hydrogen peroxide and iodide ions by using titanium dioxide in the material under the catalytic action of the ultraviolet light. Thus, the titanium dioxide doped carbon-iron composite material is used for adsorbing and photo-catalytically degrading the perfluorinated organic acid and integrates the functions of adsorption and photo-catalytic degradation; the perfluorinated organic acid is efficiently and photo-catalytically degraded by virtue of high-concentration gathering after adsorption under the action of the added media, so that the photo-catalytic degradation efficiency of the perfluorinated organic acid is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for preparing a titanium dioxide-doped carbon-iron composite material that photodegrades perfluoroorganic compounds. Background technique [0002] Perfluorinated compounds are widely used in chemical, textile, leather and other fields due to their excellent thermal stability, chemical stability, high surface activity and hydrophobic and oleophobic properties. They are an important class of surfactants, catalysts, lubricants and chemical precursor. PFOS and PFOA are two perfluorinated organic compounds that widely exist in water bodies and have attracted much attention. Studies have shown that PFOS and PFOA are the most difficult to degrade persistent organic pollutants. They are mainly distributed in the blood and liver in organisms, and can cause various toxicities such as organ toxicity, reproductive toxicity, immune toxicity and carcinogenicity. Therefore, PFO...

AI Technical Summary

Problems solved by technology

However, the application of nano-metal oxides in water treatment can cause water pollution, and it is difficult to promote them in actual production applications. Nano-metal oxides are often loaded on granular activated carbon to promote their application.

At the same time, the photodegradation of perfluorinated organic acid PFOS or PFOA is used as the electron transfer medium added in solution, which is not easy to recycle and will cause great pollution to the environment.