应用高效液相色谱研究异双官能团(VS/MCT)型活性染料C.I.Reactive Blue 194在不同条件下的水解行为及其水解动力学,结果表明:C.I.Reactive Blue 194的两个活性基VS和MCT在碱性下均发生水解,染料的主要水解产物有3种,即染料的VS、MCT活...应用高效液相色谱研究异双官能团(VS/MCT)型活性染料C.I.Reactive Blue 194在不同条件下的水解行为及其水解动力学,结果表明:C.I.Reactive Blue 194的两个活性基VS和MCT在碱性下均发生水解,染料的主要水解产物有3种,即染料的VS、MCT活性基分别被水解及同时被水解的产物;同时,染料的水解过程中还伴随有亚胺基桥基的断裂。研究同时证实了C.I.Reactive Blue 194的总水解反应为准一级动力学反应,随着pH和温度的增加,染料水解速率递增。展开更多
采用反相离子对高效液相色谱法(HPLC)研究了C.I.Reactive Red 24水解反应动力学。当染料溶液中羟基过量时，可视为一级反应；-d[A]/dt=k[A]。在pH=13时，In(A_0/A)与反应时间t呈线性关系；95℃时的水解反应速率常数K(0.0599)比70℃时的k...采用反相离子对高效液相色谱法(HPLC)研究了C.I.Reactive Red 24水解反应动力学。当染料溶液中羟基过量时，可视为一级反应；-d[A]/dt=k[A]。在pH=13时，In(A_0/A)与反应时间t呈线性关系；95℃时的水解反应速率常数K(0.0599)比70℃时的k(0.0101)高约4倍；pH为13时，反应速率常数K(5.99×10^(-2))比8.5时的k(4.8×10^(-3))高约11.5倍；pH值每升高1，染料的水解速率相应提高1.5倍。展开更多
Textile wastewater shows great threats to the environment if not well pretreated before discharge. A promising technique, ozonation, was applied to remove the color in dye solutions containing C.I. Reactive Red 195 （...Textile wastewater shows great threats to the environment if not well pretreated before discharge. A promising technique, ozonation, was applied to remove the color in dye solutions containing C.I. Reactive Red 195 （RR195） in a semi-batch reactor. The decolorization of RRI95 by the ozone process followed pseudo-first-order kinetics. Several factors which influenced the efficiency of decolorization were studied and the reaction rate constant （k） obtained with different operational parameters was compared. Our results showed that RRI95 was more easily degraded in acidic than in alkaline conditions. The dyeing auxiliaries （sodium carbonate and sodium chloride） that acted as radical scavengers could enhance the decolorization process, and the ozonation time for total color removal lengthened if the initial dye concentration was higher. The analysis of the ozonation products was performed by liquid chromatography-tandem mass spectrometer and a possible degradation pathway was predicted according to the ozonation products and structure of RR195. Our results indicated that ozonation was effective in the color removal of dyes, but further treatment might be necessary since the ozonation products are high toxic.展开更多
文摘应用高效液相色谱研究异双官能团(VS/MCT)型活性染料C.I.Reactive Blue 194在不同条件下的水解行为及其水解动力学,结果表明:C.I.Reactive Blue 194的两个活性基VS和MCT在碱性下均发生水解,染料的主要水解产物有3种,即染料的VS、MCT活性基分别被水解及同时被水解的产物;同时,染料的水解过程中还伴随有亚胺基桥基的断裂。研究同时证实了C.I.Reactive Blue 194的总水解反应为准一级动力学反应,随着pH和温度的增加,染料水解速率递增。
文摘采用反相离子对高效液相色谱法(HPLC)研究了C.I.Reactive Red 24水解反应动力学。当染料溶液中羟基过量时，可视为一级反应；-d[A]/dt=k[A]。在pH=13时，In(A_0/A)与反应时间t呈线性关系；95℃时的水解反应速率常数K(0.0599)比70℃时的k(0.0101)高约4倍；pH为13时，反应速率常数K(5.99×10^(-2))比8.5时的k(4.8×10^(-3))高约11.5倍；pH值每升高1，染料的水解速率相应提高1.5倍。
文摘Textile wastewater shows great threats to the environment if not well pretreated before discharge. A promising technique, ozonation, was applied to remove the color in dye solutions containing C.I. Reactive Red 195 （RR195） in a semi-batch reactor. The decolorization of RRI95 by the ozone process followed pseudo-first-order kinetics. Several factors which influenced the efficiency of decolorization were studied and the reaction rate constant （k） obtained with different operational parameters was compared. Our results showed that RRI95 was more easily degraded in acidic than in alkaline conditions. The dyeing auxiliaries （sodium carbonate and sodium chloride） that acted as radical scavengers could enhance the decolorization process, and the ozonation time for total color removal lengthened if the initial dye concentration was higher. The analysis of the ozonation products was performed by liquid chromatography-tandem mass spectrometer and a possible degradation pathway was predicted according to the ozonation products and structure of RR195. Our results indicated that ozonation was effective in the color removal of dyes, but further treatment might be necessary since the ozonation products are high toxic.
