Preparation method and application of modified lignocellulose ester-based Fenton-like catalyst

Abstract

The invention provides a preparation method for a modified lignocellulose ester-based Fenton-like catalyst and application of the catalyst to the field of wastewater treatment. The method comprises the following steps: drying and crushing cellulosic solid waste so as to obtain cellulosic solid waste powder; uniformly mixing the cellulosic solid waste powder with a modifier and an auxiliary agent; then adding a mixture obtained in the previous step into a mechanical activation solid-phase reactor and carrying out ball milling and a reaction; separating a product from grinding balls; adding a modified lignocellulose ester mixture obtained in the previous step into a solution of a ferric salt and / or ferrous salt under stirring; carrying out filtering; and drying filter residues so as to obtain the target catalyst. According to the invention, since the cellulosic solid waste and the like are used as raw materials, the waste is turned into the valuable and dealt with the waste, so recycling and high-value utilization of the cellulosic solid waste are realized; the preparation method employs a solid-phase method and is simple to operate; the added modifier and auxiliary agent do not need to separate, so waste gas, waste water and industrial residues are not produced, equipment investment is saved, and production cost is low; and the prepared catalyst can produce Fenton effect, has excellent water treatment effect, and is free of secondary pollution and applicable to a wide range of pH values.

Description

Technical field [0001] The invention belongs to the field of wastewater treatment, and relates to the modification of lignocellulose, in particular to a preparation method and application of a modified lignocellulose ester-based Fenton catalyst. Background technique [0002] With the rapid development of the chemical industry and related industries, especially the development of chemical, pesticide, pharmaceutical, paper, printing and dyeing, metallurgical and other industries, a large amount of industrial wastewater is not discharged out of compliance, causing more than one-third of the rivers in the country to be polluted , More than 90% of urban waters are seriously polluted, and nearly 50% of key urban water sources do not meet drinking water standards. Among them, the types and quantities of organic wastewater are increasing. These difficult-to-biodegradable organic pollutants exist in the water for a long time, have a wide range of migration, and are difficult to treat. The...

AI Technical Summary

Problems solved by technology

[0004] 1. The labor intensity of Fenton treatment is high: the operation of hydrogen peroxide is difficult, and the ferrous sulfate must be solid, and the ferrous sulfate contains about 20% iron, which greatly increases the sludge treatment intensity compared to the 11% iron contained in polyferric ;

[0005] 2. The cost of Fenton treatment is high and there is a lot of sludge: the oxidation of hydrogen peroxide cannot be fully exerted, so that the cost of the agent is high, and the amount of sludge brought by the addition of ferrous sulfate is high, and the treatment cost is high (calculated by most enterprises now The cost often does not include the increase of sludge), in addition to equipment depreciation, maintenance costs, etc.;

[0006] 3. Fenton treatment is easy to return color: if the dosage and ratio of hydrogen peroxide and ferrous sulfate are not well controlled, or the ferric iron does not precipitate, it is easy to cause the treated aqueous solution to appear yellowish or yellowish brown;

[0007] 4. Fenton treatment is highly corrosive: hydrogen peroxide has strong oxidizing properties, second only to fluorine gas, and can oxidize and corrode equipment. If the protection is not good, it will corrode the human body to a certain extent;

[0008] 5. Cannot be reused

The invention application did not disclose in the embodiment how to treat the wastewater and the data results of the treatment, so it is impossible to know its effect