Research and Application of Catalase in Textile Industry WANG Wei, WU Jian-Guo (Yancheng Textile Vocational and Technical College, Yancheng, Jiangsu 224005, China)
Abstract: This paper describes the mechanism of action of catalase, focusing on the research status of catalase in the treatment of biological biological oxygen removal and oxygen bleaching wastewater.
Key words: catalase; textile; research status CLC number: TS192.2 3 Document code: A Article ID:1009-3028(2013)01—0050—02
1. Catalase 1.1 Catalase Overview Catalase (EC1.11.1.6), also known as the catalase [1], is an oxidoreductase with hydrogen peroxide as the specific The substrate catalyzes the decomposition of hydrogen peroxide into oxygen and water by catalyzing the transfer of a pair of electrons. It is one of the most catalytically active enzymes, and one molecule of catalase per second can catalyze 80,000 molecules of hydrogen peroxide. It is widely found in biological tissues and acts to prevent cells from being destroyed by metabolites in the body. The catalytic reaction of catalase is shown below [2]. 
1.2 Mechanism of action of catalase The involvement of catalase in the active oxygen metabolism process is the main physiological function. Catalase is an important substance in the body. For organisms, oxygen molecules are not toxic, but if the electron distribution of oxygen molecules changes, it becomes active oxygen such as hydrogen peroxide, hydroxyl radicals, singlet oxygen, superoxide radicals, and the like. Hydrogen peroxide and superoxide radicals can produce hydroxyl radicals, and hydroxyl radicals have the greatest damage to the body, but most organisms do not have effective direct quenchers for hydroxyl radicals. Catalase can prevent hydrogen peroxide from reacting with superoxide radicals to form hydroxyl radicals. In the process of active oxygen metabolism, hydrogen peroxide is catalytically decomposed into water and oxygen, thus protecting the body. In addition, hemoglobin and other thiol-containing proteins are not oxidized, but also have a protective effect on the damage caused by reactive oxygen species [1-2].
2 · Application status of catalase In recent years, catalase has been widely used, and there are three main aspects in the textile industry.
2.1 Research Status of Catalase Oxygen Removal Process He Zhaoxing, Yuan Jun et al [2] compared the traditional high-temperature oxygen removal process with the biological oxygen removal process, and based on the actual production situation for cost accounting shows: biological oxygen removal process The effect is good, the production efficiency and equipment utilization rate can be significantly improved, and the water, electricity, steam, and production costs are greatly reduced. In this way, in the printing and dyeing industry with large water consumption and water shortage, the adoption of biological oxygen removal process is not only realistic, but also in the long run, the promotion of biological oxygen removal process has far-reaching significance for the sustainable development of printing and dyeing industry.
Li Wendong [3] and other studies have concluded that the activity of catalase is affected by temperature and pH. At pH 7, the temperature is 30 °C, the enzyme activity is the highest, the temperature is too high or too low, the pH value Too high or too low will cause a decrease in enzyme activity. By comparing the enzyme wash and the water wash, it was found that the enzyme wash had little effect on the whiteness of the fabric. The enzyme is present in the dye bath and has little effect on the dyeing. It can be dyed with enzyme and dye one-bath method to reduce a water washing process, water saving, energy saving and time saving. The reasonable process of enzyme washing is: bleaching→washing→enzyme treatment [pH 7-8, temperature <50 °C, enzyme dosage 0.1 0/(o.w.f), treatment for 20 min], dyeing in the same bath.
Zhang Ruiping et al [4] pointed out that the optimal process for the removal of hydrogen peroxide by catalase is temperature 20 ° C, pH 6-8, enzyme dosage 4 mL (ie 0.18 mL / L), treatment time 15 min, enzyme removal Oxygen replaces the traditional high-temperature water washing and deoxidation, which has no damage to the fabric and can shorten the production cycle. In terms of environmental protection, it has more application prospects.
Xu Gang [5] pointed out that the use of catalase to remove residual hydrogen peroxide on the cotton yarn can save about 127.76 yuan per production of 1 t yarn and reduce discharge of about 10 tons of wastewater. 1000 t yarns are produced every month, and the production cost can be saved by 1,769,100 yuan in one year. Catalase is a biological product that has a high degree of specificity and does not increase the environmental burden.
The deodorization optimization process of catalase in the linen dyeing process by Liu Jie [6] and other orthogonal analysis is: enzyme dosage 4.5 mL/L, pH 7, temperature 35 ° C, treatment time 25 min . It is pointed out that the process has no adverse effect on the bleaching whiteness of the fabric and the friction, soaping and light fastness after dyeing. At the same time, it can reduce the energy consumption of traditional processes and reduce the overall production cost. In the future, it is necessary to optimize the dyeing process after enzyme washing to reduce the color difference and further improve the product quality.
2.2 Optimization of textile catalase improvement Jiangnan University Leng Tanxiang [7] obtained a new type of catalase by screening for Thermoascus aurantiacus WSH03-01, and studied this catalase in cotton treatment The residual hydrogen peroxide on the knitted fabric and the application in enzymatic hydrolysis and dyeing in the same bath process are helpful to guide the reproducibility of the color light after the bleaching of the catalase.
Li Chengxuan [8] used sodium periodate oxidized cotton fabric as a carrier to fix catalase. The main technological conditions for the oxidation of cotton fabrics were: oxidation at a pH of 6 and a temperature of 40 ° C with 0.20 mol/L of NalO4 for 8 h. Then, the catalase was immobilized on the oxidized cotton fabric, and the immobilization process conditions were as follows: the amount of catalase was 0.20 mL/g, and the immobilization was carried out for 24 hours. After the hydrogen peroxide enzyme is immobilized, the optimum temperature, thermal stability, storage stability of the immobilized enzyme is better than that of the free enzyme by the influence of metal ions.
2.3 Peroxidase treatment of bleaching wastewater for dyeing Peracetic acid is the product of the equilibrium reaction of glacial acetic acid and hydrogen peroxide. Yang Wenfang et al. treated the wastewater of peracetic acid bleached cotton knit fabric with catalase and sodium thiosulfate, and then used it for dyeing test to study the feasibility of its reuse. The results show that the wastewater is subjected to the double treatment and then used for dyeing reactive dyes to obtain better K/S values ​​and color fastness. The wastewater treatment conditions determined by the test were: 2 g/L of catalase and 1 g/L of sodium thiosulfate at 40 ° C, and the fabrics were treated for 20 min each to achieve good results.
Li Chengxuan [8] The K/S value of fabric dyed with oxygen bleaching wastewater treated with immobilized catalase can achieve the effect of dyeing with fresh water. The color difference between the two is also small, and the rubbing fastness test is good.
3. Prospects As a new type of enzyme preparation, catalase plays a decisive role in the pretreatment process of cotton fabrics. Compared with the traditional water washing process and chemical treatment process, the enzyme treatment process can save water, electricity, energy and other production costs, reduce pollution and facilitate processing, save dyes and obtain good dye reproducibility, and make the fabric softer and stronger. Well, the process flow is shortened, the production efficiency is improved, and the operation is safer and more convenient. The use of catalase is an effective way to achieve energy saving, emission reduction and sustainable development in the textile industry, and thus become the future development direction of the clean production of the textile industry.
references:
[1] Cao Xiangyu. Industrial production and application research of catalase [D]. Wuxi: School of Environmental Engineering, Jiangnan University, 2006.
[2] He Zhaoxing, Yuan Jun. Application and practice of catalase [J]. Printing and dyeing, 2001, (5): 29-30.
[3] Li Wendong, Wu Yujuan, Zhu Quan, et al. Study on the removal of residual hydrogen peroxide on fabric by catalase [J]. Printing and dyeing, 2000, 26 (9): 8-10.
[4] Zhang Ruiping. Application of catalase in cotton knit fabric bleaching and dyeing process [J]. Printing and dyeing, 2000, (8): l2-14.
[5] Xu Gang. Application of catalase in dyeing production [J]. Progress in Textile Technology, 2005, (2): 29-30.
[6] Liu Jie, et al. Enzymatic washing and deoxidation technology in linen dyeing [J]. Journal of Qiqihar University, 2006, (6): 102-104.
[7] Leng Sunxiang, Qian Guozhen, Hua Zhaozhe, et al. Study on bleaching and dyeing process of cotton knitted fabric with catalase [J]. Printing and dyeing, 2006, 32 (19): 1-3.
[8] Li Chengxuan. Immobilized catalase for H2O2 [D]. Wuxi: School of Textile Engineering, Jiangnan University, 2008.
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