Cu_xFe_(1-x)@γ-Al_2O_3催化剂湿式氧化陶瓷印花废水的性能及表征

Properties and characterization of Cu_xFe_(1-x)@γ-Al_2O_3 catalysts on treating ceramic printing wastewater with catalytic wet oxidation method

采用常温浸渍法制备催化剂Cu_xFe_(1-x)@γ-Al_2O_3,并用于陶瓷印花废水的催化湿式氧化处理,考察组分构成对催化剂Cu_xFe_(1-x)@γ-Al_2O_3活性和稳定性的影响。结果表明:在4种样品Cu0.5Fe0.5@γ-Al_2O_3,Cu@γ-Al_2O_3,Fe@γ-Al_2O_3和γ-Al_2O_3中,Cu0.5Fe0.5@γ-Al_2O_3的催化活性和稳定性最高。催化剂Cu0.5Fe0.5@γ-Al_2O_3中的Fe促进Cu进入γ-Al_2O_3载体内部并形成稳定的固溶体Al2Cu O4,故此催化剂的硬度和稳定性最高;此催化剂应用前后的SEM图无明显的形貌变化,XRD谱图无明显的物相变化,证实了其稳定性的存在。在优化的操作条件下,催化剂Cu0.5Fe0.5@γ-Al_2O_3催化湿式氧化陶瓷印花废水的COD及色度分别为280 mg·L^(-1)、20倍,达到《污水综合排放标准》(GB 8978^(-1)996)中染料类废水的三级排放标准。

Four catalysts（ CuxFe1-x@ γ-Al_2O_3） were prepared using the impregnation method at room temperature,and then applied to treating ceramic printing wastewater with the catalytic wet oxidation method. Experiments were conducted on the impact of composition of the CuxFe1-x@ γ-Al_2O_3 catalyst on wet oxidation activity and stability. The results showed that the Cu0. 5Fe0. 5@ γ-Al_2O_3 catalyst displayed the highest catalytic activity and stability of the four prepared catalysts（ Cu0. 5Fe0. 5@ γ-Al_2O_3,Cu@ γ-Al_2O_3,Fe@ γ-Al_2O_3 and γ-Al_2O_3）.For the Cu0. 5Fe0. 5@ γ-Al_2O_3 catalyst,iron drives copper to enter the lattices of the γ-Al_2O_3 support and to form a stable solid solution（ Al2 Cu O4）. Therefore,this catalyst displayed the greatest hardness and stability of the four samples. After being applied for catalytic wet oxidation,the catalyst showed little change in its morphology or crystal phase,which confirmed the stability of the catalyst. Under optimal running conditions,the COD and chromaticity of the ceramic printing wastewater treated by catalytic wet oxidation method,with the catalyst CuxFe1-x@ γ-Al_2O_3,were 280 mg·L^-1and 20 times,respectively,which met the third emission standard on dye wastewater,under the Integrated Wastewater Discharge Standard（ GB 8978-1996）.