Method for preparing Fenton-like reaction catalyst and application thereof

Abstract

The invention provides a method for preparing Fenton-like reaction catalyst. Inert oxide or a molecular sieve is used as a carrier, and the carrier is loaded with nano-scale iron oxide. The method includes mixing the iron oxide and the carrier with each other and then molding the iron oxide and the carrier to obtain particles; calcining the particles at the temperature of 200-500 DEG C to obtain the Fenton-like reaction catalyst with the particle size of 10-40 mesh. A weight proportion of the iron oxide to the carrier is 1:(0.4-1). The method has the advantages that the Fenton-like reaction catalyst prepared by the aid of the method is high in catalytic activity, selectivity and stability and can be used as Fenton-like oxidation reaction catalyst for advanced treatment of wastewater after the wastewater is subjected to biochemical treatment, accordingly, the catalytic efficiency can be improved in reaction procedures, float mud can be prevented, the COD (chemical oxygen demand) removal rate of the treated wastewater can be obviously increased as compared with existing Fenton treatment, and wastewater treatment discharge requirements can be met; the pH of treated outflow ranges from 7.0 to 8.0, and the treated outflow can be directly discharged without pH regulation; waste mud generated in treatment procedures can be utilized and can be used for producing coatings.

Description

technical field [0001] The invention relates to the technical field of catalysts for Fenton-like reactions, in particular to a method for preparing a Fenton-like reaction catalyst and an application of the Fenton-like reaction catalyst. Background technique [0002] Due to the different pollutants and pollution levels of industrial wastewater, the biodegradability of industrial wastewater varies greatly. At present, most industrial wastewater is difficult to meet the discharge standard after biochemical treatment. It is necessary to add advanced treatment units for reprocessing to achieve discharge. Standard, advanced wastewater treatment technologies that have been developed include ozone oxidation, activated carbon adsorption, membrane separation, wet oxidation, and Fenton oxidation, among which Fenton oxidation (H 2 o 2 / Fe 2+ ) is considered to be an effective, simple and economical treatment method, while other methods are difficult to be accepted by the industry due ...

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Problems solved by technology

After four generations of development, it is determined that the optimal pH of the Fenton oxidation reaction is 3 to 4, and the pH value is adjusted according to different water quality characteristics. 2 o 2 and Fe 2+ The amount and proportion of the sludge production is controlled, and the Fenton oxidation treatment technology has been substantially optimized. However, the sludge floating problem caused during the treatment process directly affects the water quality of the discharged water after treatment, often resulting in the discharge water not meeting the standard. After research It was found that the sludge floating problem was mostly due to the continuous generation of O in the reaction. 2 Cause, although the reaction formula of Fenton oxidation is H 2 o 2 +Fe 2+ →·OH+OH - +Fe 3+ →Fe(OH) 3 ↓, but the reaction process is not a single reaction, it will be accompanied by multiple reactions such as: Fe 3+ +H 2 o 2 →HO 2 ·+Fe 2+ +H + , H 2 o 2 +HO 2 ·→H 2 O+O 2 +HO·, so in H 2 o 2 After adding to the system, if it cannot be converted into OH in time, it will decompose H 2 o 2 →H 2 O+O 2 , continuously generating O 2 , resulting in the floating of sludge, which has become a very difficult problem in the application of Fenton oxidation treatment technology

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