Soft magnetic composite photocatalyst and preparation method thereof

Abstract

The invention discloses a soft magnetic composite photocatalyst and a preparation method thereof, belonging to a sewage treatment technology and aiming to provide the soft magnetic composite photocatalyst easy to separate and recycle and the preparation method thereof. The technical scheme adopted by the invention comprises the following key point that granular active carbon is loaded with soft magnetic Mn0.5Zn0.5Fe2O4 and TiO2. The method for preparing the soft magnetic composite photocatalyst comprises the following steps of: (1) after manganese sulfate, zinc sulfate and green copperas are prepared into a mixed solution by ionized water, adding the granular active carbon into the mixed solution, uniformly stirring and reacting in a hydro-thermal reaction kettle, cooling, filtering, washing and drying a reaction product to obtain soft magnetic active carbon; and (2) preparing tetrabutyl titanate, absolute ethyl alcohol, nitric acid and water into a titanic acid solution, impregnating the soft magnetic active carbon into the titanic acid solution, carrying out stirring, standing, pumping filtration and drying on the impregnated soft magnetic active carbon, then calcining the obtained product in a muffle furnace in an inert atmosphere, and cooling the calcined product to the room temperature to form the soft magnetic composite photocatalyst. The soft magnetic composite photocatalyst is used for organic wastewater treatment.

Description

Technical field: [0001] The invention relates to a sewage treatment technology, in particular a soft magnetic composite photocatalyst suitable for the treatment of waste water containing organic pollutants and a preparation method thereof. Background technique: [0002] Semiconductor photocatalytic oxidation technology is a heterogeneous advanced oxidation technology developed rapidly in recent years, which has attracted extensive attention in the research and application of organic wastewater treatment. Among them, nano-TiO 2 It has the advantages of resistance to chemical corrosion and light corrosion, stable properties, non-toxicity, high photocatalytic activity, fast reaction speed, non-selective degradation of organic matter and easy to completely mineralize it, and no secondary pollution. It is generally considered to be the most One of the green and environment-friendly catalysts with application prospect. [0003] The photocatalysts used in general water treatment ...

AI Technical Summary

Problems solved by technology

[0003] The photocatalysts used in general water treatment systems are powdered TiO 2 , there are the following problems: (1) TiO 2 The degradation effect of high concentration organic pollutants is better, but the degradation rate of low concentration organic pollutants is very slow, which also greatly limits the performance of TiO 2 Application as Photocatalyst

(2) TiO 2 Powders have a tendency to agglomerate, especially in TiO 2 This trend is more obvious when the concentration is higher, and the specific surface area of ​​the photocatalyst decreases significantly after agglomeration, and the photocatalytic effect will also decrease accordingly.

(3) Due to TiO 2 The particle size is too small, which makes its separation, recovery and regeneration very difficult, which will lead to serious loss of photocatalyst and high cost. TiO 2 The advantage of being cheap will no longer exist

However, due to the small pore volume and specific surface area of ​​nano-magnetic materials and the low loading of titanium, the photocatalytic activity of the overall composite photocatalyst is reduced.