A kind of preparation method of heterogeneous oxidation reaction catalytic fiber

Abstract

The invention discloses a method for preparing a heterogeneous oxidation reaction catalytic fiber. In the method, free radical polymerization, wet spinning, coordination and crosslinking of organic polymer ligands and iron ions, high-stretching heat setting treatment and Iron ions coordinate cross-linking again. High-stretching makes the curled macromolecular chains in the fiber highly stretched and oriented, endowing the fiber with excellent mechanical properties. High-stretching and heat-setting treatment effectively increase the specific surface area of ​​the fiber during the process of highly refining the fiber, exposing more carboxyl active sites, in order to coordinate more iron ions and form a more complete three-dimensional network cross-linking The structure lays the foundation and endows the fibers with extremely high catalytic activity. The exposed redundant carboxyl active sites can quickly coordinate the eluted iron ions, effectively inhibit the loss of active components, endow the fiber with stable reusability, and at the same time, the concentration of residual iron ions in the purified water is extremely low, reducing Secondary pollution.

Description

technical field [0001] The invention relates to the field of catalytic oxidation reactions, in particular to a method for preparing catalytic fibers for heterogeneous oxidation reactions. Background technique [0002] Water is an essential element for human survival, and the world is facing the problems of water scarcity and water pollution. Dye wastewater contains a large amount of toxic azo dyes and inorganic salts (including NaCl or Na 2 SO 4 ), most of the dyes contain non-biodegradable aromatic structures and azo groups. These dye wastewaters have the characteristics of high chroma and COD content, large water volume changes, strong alkalinity, complex components, and difficult biodegradation. Contains a variety of organic substances that are biologically toxic or carcinogenic, teratogenic and mutagenic. Therefore, the treatment of dye wastewater has become the focus of water pollution control. [0003] At present, the main methods for treating dye wastewater in ind...

AI Technical Summary

Problems solved by technology

The Fenton reaction has the advantages of simple operation, mild reaction conditions, easy control, safe raw materials, and environmental friendliness, but the traditional homogeneous Fenton reaction also has obvious disadvantages: first, the applicable range of pH is narrow, usually only when the pH is 2 -4, when the pH of the environment is higher than 4, iron salts are prone to precipitation, which hinders the iron cycle; second, in the actual process of sewage treatment, under acidic operating conditions, not only the requirements for equipment are more stringent High, and in the subsequent treatment, the water needs to be adjusted back to neutral. This process will generate a large amount of iron sludge, which will increase the cost of subsequent treatment. Third, the catalyst cannot be directly recovered and cannot be reused.

[0006] Nevertheless, the catalytic ability of conventional heterogeneous Fenton catalysts is limited, this is because: the catalytic reaction is carried out on the surface of the solid catalyst, on the one hand, the specific surface area of ​​the solid is relatively low, and there are few active sites available, making the catalyst The catalytic activity of the solid catalyst is limited. On the other hand, the dissolution or elution of active components during the catalytic process is unavoidable, resulting in a gradual decrease in the catalytic activity of the solid catalyst, making it difficult to use it stably for a long time.

Images