Zhao Weirong, Wu Zhongbiao, Wang Dahui
Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.
J Hazard Mater. 2006 Oct 11;137(3):1859-65. doi: 10.1016/j.jhazmat.2006.05.032. Epub 2006 May 16.
This study characterizes the ozonation of the azo dye Cationic Red X-GRL in the presence of TBA (tert-butyl alcohol), a scavenger of hydroxyl radical, in a bubble column reactor. Effects of oxygen flow rate, temperature, initial dye concentration, and pH were investigated through a series of batch tests. Generally, enhancing oxygen flow rate enhanced the removal of dye. However, there was a minimum removal of dye at temperature 298 K. Increasing or decreasing temperature enhanced the degradation of dye. Increasing the initial dye concentration decreased the removal of dye while the ozonation rate increased. The rate constants and the kinetic regime of the reaction between ozone and dye were obtained by fitting the experimental data to a kinetics model based on a second order overall reaction, first order with respect to both ozone and dye. The Hatta numbers of the reactions were between 0.039 and 0.083, which indicated that the reaction occurred in the liquid bulk. The direct oxidation rate constant k(D) was correlated with temperature by a modified Arrhenius Equation with an activation energy E(a) of 15.538 kJ mol(-1).
本研究描述了在鼓泡塔反应器中，在羟基自由基清除剂叔丁醇（TBA）存在的情况下，偶氮染料阳离子红X-GRL的臭氧化过程。通过一系列间歇试验研究了氧气流速、温度、初始染料浓度和pH值的影响。一般来说，提高氧气流速可提高染料的去除率。然而，在298 K的温度下，染料的去除率最低。升高或降低温度均可提高染料的降解率。增加初始染料浓度会降低染料的去除率，而臭氧化速率会增加。通过将实验数据拟合到基于二级总反应（对臭氧和染料均为一级）的动力学模型，获得了臭氧与染料反应的速率常数和动力学机制。反应的哈塔数在0.039至0.083之间，这表明反应发生在液相当中。直接氧化速率常数k(D)通过修正的阿伦尼乌斯方程与温度相关，活化能E(a)为15.538 kJ mol(-1)。
