Magnetic biomimetic catalyst and preparation method and application method thereof

Abstract

The invention relates to a magnetic biomimetic catalyst and a preparation method and an application method thereof. The preparation method adopts the technical scheme that the preparation method comprises the following steps of uniformly mixing coal-based carbon and a KOH (potassium hydroxide) solution, and treating for 1 to 2h under the vacuum atmosphere at the temperature of 105 DEG C; putting into a microwave generation device, and activating at the temperature of 300 to 700 DEG C; cooling, adding deoxidizing and deionizing water, stirring, standing, and obtaining an upper KOH recycling liquid and a lower precipitate; washing the lower precipitate, and drying, so as to obtain the modified coal-based carbon; uniformly mixing FeSO4.7H2O (ferrous sulfate), the modified coal-based carbon and the deoxidizing and deionizing water, so as to obtain suspension liquid; uniformly mixing NaNO3 (sodium nitrate), NaOH (sodium hydroxide) and the deoxidizing and deionizing water, dripping into the suspension liquid, stirring, and standing; washing the lower magnetic precipitate to neutral state, and drying, so as to obtain the magnetic biomimetic catalyst; uniformly mixing the magnetic biomimetic catalyst and organic wastewater, adding H2O2 (hydrogen peroxide), stirring, and treating, so that the COD (chemical oxygen demand) and chroma of the organic wastewater can reach the national industrial regeneration water quality standard. The preparation method has the characteristics that the technology is simple, the operability is high, the cost is low, the yield is high, and the environment-friendly effect is realized.

Description

Technical field [0001] The invention belongs to the technical field of magnetic enzyme imitation catalysts. Specifically, it relates to a magnetic enzyme imitation catalyst and its preparation method and application method. Background technique [0002] Organic wastewater is difficult to treat because of its complex structure, high concentration, and resistance to biochemical degradation. Most of these organic pollutants have toxic effects or are carcinogens. If they are discharged into water bodies, they will cause great harm to the environment and human health. Therefore, it is necessary to carry out advanced treatment of organic wastewater to realize the regeneration and recycling of wastewater. [0003] Activated sludge method is a widely used and effective method. However, the activated sludge method has a limited effect on the degradation of chroma and COD in organic wastewater, and it is not only difficult to reach the standard for recycling of reclaimed water, nor even di...

AI Technical Summary

Problems solved by technology

However, the activated sludge method has a limited effect on the degradation of chroma and COD in organic wastewater. Not only is it difficult to meet the recycling standards for reclaimed water, but it is even impossible to meet the discharge standards.

Although the Fenton method can effectively degrade organic wastewater, it has problems such as low catalytic degradation efficiency, narrow pH range, large amount of iron sludge, and high cost.

[0004] As a new type of technology, Fenton-like technology can efficiently catalyze and degrade organic pollutants in wastewater, such as the patented technology of "Preparation Method and Application of a Fenton-like Catalyst" (CN105312055A), the prepared Co(OH) 2 / Cu 2 Although the O complex catalyst has a good catalytic degradation effect on methyl orange wastewater, there are problems such as the difficulty of catalyst recovery; Fe 3 o 4 Because it has both superparamagnetism and natural peroxidase catalytic activity, it can be used to prepare Fenton-like catalysts, "a multi-phase magnetic Fenton-like photocatalyst and its preparation method and application" (CN105032423A) patent technology, the prepared Fe 3 o 4 @SiO 2 @TiO 2 Although the catalyst has a high removal rate for methylene blue wastewater, and the catalyst is magnetic, it is easy to magnetically separate and recover, but the preparation of the catalyst is complicated, the degradation process requires light conditions, and Fe is not fully utilized. 3 o 4 Catalytic function

Due to nano-Fe 3 o 4 It is easy to agglomerate and needs to be loaded on a carrier to avoid agglomeration. The patented technology of "Multi-walled carbon nanotube-supported nano-ferric oxide catalyst and its preparation method and application" (CN102671661B) prepared Fe 3 o 4 -Although MWCNTs catalyst has a significant effect on the degradation of methylene blue wastewater, can effectively solve the problem of agglomeration and easy magnetic separation and recovery of the catalyst, it is not suitable for the treatment of industrial organic wastewater because of the high price of carbon nanotubes as a carrier and the complicated preparation conditions of the catalyst.

"Fe degrading POPs 3 o 4 / Fe 0 / coke imitation enzyme catalyst and its preparation method" (CN105148915A) patent technology, the prepared Fe 3 o 4 / Fe 0 Although coke has a good treatment effect on POPs wastewater and the carrier is cheap and easy to obtain, the complex process and expensive reagents lead to high catalyst preparation costs and limited practicability

Although the research on Fenton-like technology has attracted widespread attention, there are few reports on the application of regenerated industrial wastewater such as organic wastewater.

Images