Fenton氧化活性深蓝染料B-2GLN的动力学

Kinetics of Reactive Dark Blue B-2GLN with Fenton oxidation process

为了考查H2O2/Fe2+的摩尔比和H2O2的初始剂量、pH值以及活性深蓝染料B-2GLN(RDB B-2GLN)的初始浓度对活性深蓝染料B-2GLN降解过程的影响,采用在线分光光度法对活性深蓝染料B-2GLN的Fenton氧化过程进行了研究,探讨了其动力学过程,并利用气相色谱-质谱联用分析降解中间产物。结果显示,采用Fenton氧化降解水溶液中活性深蓝染料B-2GLN,在H2O2的剂量为2.635 mmol/L,pH值为2.7,H2O2/Fe2+的摩尔比为37.80和活性深蓝染料B-2GLN的初始浓度16 mg/L的条件下,得到300 s后活性深蓝染料B-2GLN的最大色度去除率为85.04%。水溶液中活性深蓝染料B-2GLN与·OH的反应速率常数为2.62×1011L/(mol·s)。活性深蓝B-2GLN染料的分子结构被Fenton试剂分解而未被完全矿化,同时对活性深蓝染料降解产物进行了分析。在线分光光度法是研究染料色度去除率的一种精确、快速与可行的方法。

In order to investigate the effects of mole ratio of H2O2to Fe2 +,pH value,initial dye concentration on chroma removal rate,the degradation of Reactive Dark Blue B-2GLN(RDB B-2GLN) in Fenton oxidation process was studied using online spectrophotometric method. The degradation kinetic mechanics was evaluated and the intermediates products were analyzed by gas chromatography-mass spectrometer(GC-MS). The results showed that the maximum color removal rate(85. 04%) of RDB B-2GLN was obtained after 300 seconds under the preparation conditions(H2O2∶ Fe2 += 37. 80,pH = 2. 7,[H2O2] = 2.635 mmol/L,and the [dye] = 16 mg/L). The intrinsic reaction rate constant of ·OH with RDB B-2GLN in aqueous solution was 2. 62 × 1011L/(mol·s). The molecule structure of RDB B-2GLN was decomposed and not mineralized by Fenton's reagent(300 s). The probable mechanism of the degradation of RDB B-2GLN was discussed. Online spectrophotometric method is an accurate,quick,and feasible technique to monitor color removal rate of RDB B-2GLN in Fenton process.