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为实现活性染料X-3B废水在常温常压下高效地脱色,以过渡金属为活性组分、活性氧化铝(γ-Al_2O_3)为载体,采用等体积浸渍法制备了一系列M/γ-Al_2O_3(M=Cu2+、Fe3+、Zn2+、Mn2+)负载型催化剂,并考察其对活性艳红X-3B模拟染料废水的脱色性能,同时考察了活性组分、焙烧温度、负载量、催化剂投加量、氧化剂用量及pH值等因素对活性艳红X-3B脱色性能的影响规律。结果表明,常温常压下,以Cu2+为活性组分,焙烧温度为350℃、负载量为4%(质量分数)、氧化剂H_2O_2浓度为58 mmol/L、催化剂投加量为1.2 g/L、pH值为5~7、反应50 min时,催化剂对活性艳红X-3B废水的脱色效果最佳,脱色率可达95%以上。平行试验表明,Cu2+的存在可增加载体表面的吸附中心,H_2O_2可分解产生HO·,当两者共存时,活性艳红X-3B在催化剂表面主要发生化学吸附与催化氧化两种反应过程,且染料在Cu/γ-Al_2O_3上发生的吸附作用明显大于H_2O_2分解产生HO·而引发的催化氧化作用。动力学试验表明,活性艳红X-3B反应过程动力学模型与初始质量浓度有关,大于等于200 mg/L时,符合准一级动力学方程。
In order to effectively remove the reactive dye X-3B wastewater under normal temperature and pressure, a series of M / γ-Al 2 O 3 (M = Cu2 +, Fe3 +, Zn2 +, Mn2 +) supported catalysts were prepared. The decolorization performance of Reactive X-3B simulated dye wastewater was investigated. The effects of active components, calcination temperature, loading, catalyst dosage, The amount of oxidant and pH value and other factors on the decolorization performance of reactive brilliant red X-3B. The results showed that Cu2 + was used as the active component at normal temperature and pressure, the calcination temperature was 350 ℃, the loading was 4%, the concentration of H_2O_2 was 58 mmol / L, the dosage of catalyst was 1.2 g / L, When the pH was 5 ~ 7, the decolorization rate of Reactive Brilliant X-3B wastewater was the best when the reaction time was 50 min, and the decolorization rate reached more than 95%. The parallel experiments show that the presence of Cu2 + can increase the adsorption center of the carrier surface and H_2O_2 can decompose to produce HO ·. When the two coexist, the reaction process of reactive red X-3B mainly occurs on the catalyst surface by chemical adsorption and catalytic oxidation The adsorption of dye on Cu / γ-Al_2O_3 is obviously larger than that of H_2O_2 to produce HO ·. Kinetic experiments show that the kinetic model of reactive brilliant red X-3B reaction is related to the initial mass concentration. When the concentration is 200 mg / L or more, the kinetic model is in accordance with the pseudo first-order kinetic equation.