Manufacturing method of fiber for catalytic oxidation decomposition of cationic dye

Abstract

The present invention discloses a manufacturing method of fiber for catalytic oxidation decomposition of a cationic dye by an oxidizing agent, and relates to the technical field of functional fiber manufacturing, according to the method, solution polymerization method is used for synthesis of poly (methyl) acrylate, poly (methyl) acrylate fiber with rich hydroxyl groups on the surface is spun by wet spinning technology, and finally under alkaline conditions, by oxidation-reduction reaction between the hydroxyl groups on the fiber surface and potassium permanganate, the potassium permanganate is reduced to produce a manganese oxide, the hydroxyl groups are oxidized to generate carboxylic acid groups, on the basis of the complexation between the manganese oxide and the carboxylic acid groups, the manganese oxide is firmly bonded to the fiber surface to produce composite fiber with the poly (methyl) acrylate as a skeleton and the manganese oxide as a coating, and the characteristic of catalytic oxidation decomposition of the cationic dye by the oxidizing agent is given to the composite fiber. Compared with a powdered or granular manganese oxide material, a variety of forms of products can be processed by weaving or no weaving of the fiber, and the requirements of industrial applicability can be better met.

Description

technical field [0001] The invention relates to a fiber manufacturing technology, in particular to a manufacturing method for oxidizing and decomposing cationic dye fibers that can catalyze oxidants. The manufacturing method utilizes solution polymerization, wet spinning, and potassium permanganate treatment under alkaline conditions, etc. technology. Background technique [0002] In view of the trend of my country's population growth, by 2030 my country's per capita water resources will increase from the current 2200m 3 Descend to 1700m 3 -1800m 3 (Zhang Lili, Li Huafen, Su Dechun, Distribution characteristics and changing rules of heavy metals in sludge from urban sewage treatment plants in my country, Environmental Science Research, 2013, 26(3): 313-319), the total water demand is even closer to the development and utilization of water resources The total amount, the water shortage problem will be more prominent, and the increasingly serious water pollution will make th...

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Problems solved by technology

The coagulation method has the advantages of good decolorization effect and high removal rate, but the coagulation method will produce a large amount of sludge during the flocculation and sedimentation process, and the sludge needs to be further treated, otherwise it will easily cause secondary pollution, and the pH and ion composition of the solution have a great impact on the coagulation process. The effect is greatly affected, so the application range of the coagulation method is limited; the adsorption method has the advantages of simple operation and small investment, but due to the high regeneration cost of the adsorbent and the disadvantages of poor adsorption to hydrophobic particles, it is only applicable It is suitable for the treatment of small-scale specific wastewater; the photochemical oxidation method has the advantages of mild reaction conditions, strong oxidation ability, and wide application range. Limitation; Catalytic oxidation decomposition method can make up for the defects of the other methods mentioned above, and is currently an ideal method for treating wastewater containing cationic dyes. Pollution is of great practical significance

[0003] At present, materials that can be used to catalyze the decomposition of cationic dyes have appeared, for example, ① nano-titanium dioxide, which is an ideal material for photocatalytic decomposition of cationic dyes, but its solar energy utilization efficiency is low, and its practical application is limited (Jiang Yinhua, Zhao Chen Xuan, Liu Hui, Nano-TiO 2 -ZnO composite photocatalyst on photodecolorization of cationic blue X-GRL, Acta Solar Sinica, 2008, 29(3): 299-305); ② Titanium dioxide / multi-walled carbon nanotube film material, this material can significantly improve the light Catalytic activity, but there are disadvantages such as inhomogeneous loading with the substrate and infirmity, and the application is limited (Li Aichang, Lu Yanhong, Chen Rongying, etc., preparation of titanium dioxide / multi-walled carbon nanotube films by electrophoresis and their photocatalytic degradation of Rhodamine B. Silicon Acta Sinica Sinica Sinica, 2014); ③ nano-zinc oxide material, as a photocatalyst, has high photosensitivity, good energy band properties, low price, and has good photocatalytic activity when decomposing certain dyes, but its The quantum yield is low, which greatly reduces the photocatalytic efficiency, and it is difficult to separate and recycle, and it is easy to deactivate. Therefore, its application is limited (Wang Xiaohong, Research on the application of lignin in the preparation of nano-ZnO photocatalyst and dye wastewater treatment, 2014 , Jiangsu University doctoral dissertation); ④ tungsten trioxide photocatalytic material, this material has a small band gap and can absorb the visible part of sunlight, but its conduction band electrons are not easy to be carried by oxygen, so its in The application of photocatalytic decomposition of cationic dyes is less (Bi Dongqin, the effect of iron oxide bulk phase doping and surface modification on the photocatalytic performance of tungsten oxide, 2012, doctoral dissertation of Zhejiang University); ⑤ manganese oxide (Wang Xue, nano Research on Catalytic Oxidation of Structural Manganese Oxide for Dyestuff and Papermaking Wastewater, 2013, Master Thesis of Zhejiang Sci-tech University; Liu Wei, Zhao Tao, Huai Lufeng, New Ecological MnO 2 Preparation and treatment of alizarin red dye, Journal of Wuhan Institute of Technology, 2008, 27(2): 41-44; Fu Junli, Preparation of manganese oxide catalyst and its catalytic performance, 2014, Master's degree thesis of Nanchang Hangkong University ; Dongming Cai, Nanqi Ren, Acid-modified δ-MnO 2 The characteristics and mechanism of dye removal in water, Environmental Chemistry, 2007, 26(2): 171-174), compared with other oxide materials mentioned above, manganese oxide has the advantages of low cost, convenient manufacture, etc., and can decompose cations in catalytic oxidation In the process of type dyes, it has the characteristics of fast catalytic speed and high catalytic efficiency, so it has attracted widespread attention from scholars.

Nevertheless, most of the manganese oxides currently produced are powdery or granular, and have a single shape. Therefore, it is of great practical significance to study and develop multi-morphic manganese oxide-based materials that can catalyze the oxidative decomposition of cationic dyes.