Fenton氧化活性深蓝染料B-2GLN的动力学

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。

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

In order to investigate the effects of mole ratio of H₂O₂ to 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 2.62×10¹¹ L/(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.