Preparation Of Cationic Fabric And Application In Treatment Of Dyeing Wastewater

Cation modifier can introduce cationic groups or compounds in the fabric and change the performance of the fabric. Due to its positive charge on the surface, the cation fabric has certain application value in the adsorption of anionic dyes. Therefore cation fabric gets more and more attention from people in the treatment of dye wastewater. Based on the epichlorohydrin(ECH), trimethylamine(TMA), and hydrochloric acid(HCl) as raw materials, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride(CHPTMAC) was synthesied with the method of water phase and preperated cation fabric by grafting cationic onto fabric. To control reaction conditions, the concentration of raw material-ECH and by-products-1, 3-two chlorine propanol(DCP) were monited by gas chromatograph. The optimum process of syntheting CHPTMAC was determined with the conversion rate of ECH and the effect of adsorpting dye wastewater by modified fabric. And the functional groups and structure of CHPTMAC were determined by characterization means, such as infrared spectrometer(FT-IR) and nuclear magnetic resonance spectrometer(1H-NMR). The modificatied conditions were studied and the best one was selected. According to the effects of adsorpting anionic dye with cationic fabric, the thermodynamic principle of adsorpting process was studied and the interaction between cationic fabric and dye was also revealed. In addition, on the base of the optimum conditions of adsorpting, the desorption properties of cationic fabric in alkaline liquid of sulfur dioxide carbamide were preliminary studied with the method of water bath temperature oscillation. It was determined that the impact of desorption performance with cationic fabric by amount of sulfur dioxide carbamide, Na OH concentration and desorption time. And with this analyes, it can determine the best desorption conditions. It was preliminary exploratied that the effect from many adsorption and desorption experiments to the recycling performance of cationic fabric.The main research results of this paper were as follows:1.The optimum process for synthesing CHPTMAC was determined. Research results showed that the optimum process was that the ratio of reactants, n(ECH):n(TMAHC) = 1, p H of 8, reaction time of 5h and reaction temperature of 30℃. The conversion rate of ECH reached to 94.37%. Under the condition of the product, adsorption performance was excellent from cationic fabric to dye wastewater and the adsorption rate reached to 97.8%.2.The preparation of ideal cationic fabric was in the direct effect on the absorption ability of the cationic fabric to the dye wastewater as the main control index. It systemly studied that different amount of CHPTMAC, concentration of Na OH, modification time and temperature resulted absorption performance of cationic fabric and found the best modification process of high performance cationic fabric. The results showed that on the selected CHPTMAC aqueous solution of 46% mass concentration, the amount of 2.2g, concentration of Na OH of 8g/L, modification time of 60 min and modification temperature of 60℃. Under the condition of bath ratio 1:50, the adsorption quantity from cationic fabric to novacron yellow FN-2R dye, erionyl red A-2BF dye and solophenyl blue TLE dye achieved 14.851mg/g, 14.619 mg/g and 14.842 mg/g.3.For the selected cationic fabric, it was studied the effect of initial concentration of novacron yellow FN-2R dye, erionyl red A-2BF dye and solophenyl blue TLE dye, electrolyte solution, adsorption time and temperature. Research results showed that when the initial concentration of dye solution 400mg/L, adsorption time 40~60min, adsorption temperature 60℃, absence of electrolyte, the decolorization rate of dye achieved 95.15%, 95.89% and 99.04%. Adsorptions of cationic fabric for novacron yellow FN-2R and erionyl red A-2BF dye were in line with the Langmuir adsorption isotherm model, adsorption for solophenyl blue TLE dye was in accordance with the Freundlich isotherm models, and the adsorptions of the dyes belong to spontaneous and endothermic process.4. It was studied the concentration of sulfur dioxide carbamide, Na OH concentration and desorption time were on the influence of cation fabric recycling performance. Research results showed that under the condition of water bath and constant temperature oscillation, the best process conditions for 1g cationic fabric desorpting novacron yellow FN-2R dye were that concentration of sulfur dioxide carbamide was 4g/L, concentration of Na OH was 10g/L and the desorption time was 30 min. In this condition, three kinds of dye in cationic fabric were desorpted cyclely. The experimental data showed that for novacron yellow FN-2R, cationic fabric can cycle 5 times between adsorption and desorption, the rate of cyclic utilization still amounted to 78.15%. In the case of erionyl red A-2BF and solophenyl blue TLE dyes, cationic fabric can cycle 5 times between adsorption and desorption, the rate of cyclic utilization remained above 99.61%.