类芬顿催化剂Cu-Co-Fe金属氧化物的制备及其对典型难降解有机物的去除

PREPARATION OF A FENTON-LIKE Cu-Co-Fe METALLIC OXIDE CATALYST AND ITS DEGRADATION PERFORMANCE ON TYPICAL REFRACTORY ORGANICS

针对典型难生物降解污染物,为强化其在废水处理中的降解去除,开展了合成类芬顿催化剂及其对安替比林(ANT)及染料降解特性的研究。水热法合成的Cu_(1-x)Co_(x)Fe_(2)O_(4)金属氧化物催化剂是一种具有尖晶石立方结构的磁性材料,比表面积为147.3~187.5 m;/g,饱和磁化值为17.2~62.3 EMU/g。随着Co含量逐渐增加,催化剂的催化活性有明显提高。所得最佳Cu_(1-x)Co_(x)Fe_(2)O_(4)催化剂的适用pH值为7~9,ANT初始浓度为50 mg/L,催化剂投加量为0.7 g/L和H_(2)O_(2)投加量为150 mmol/L的条件下,当反应初始pH=7时,对ANT去除率为93.1%;pH=9时去除率达到94.7%。不同类型的难降解有机物,如罗丹明B和酸性橙Ⅱ在该催化剂催化作用下也可实现有效降解。催化剂通过磁性回收再利用5次循环后,ANT去除率仍保持在80%以上,表明催化剂具有较好的稳定性和重复使用性。研究合成的类芬顿催化剂为高效去除废水中的难降解有机物提供了科学依据。

The aim of this study was to enhance the typical refractory organics degradation in the wastewater treatment by using A Fenton-like catalyst,which was synthesized and tested for the antipyrine and dyes degradation.The results demonstrated that the metallic oxide catalyst,Cu_(1-x)Co_(x)Fe_(2)O_(4)prepared by the hydrothermal method had a good crystal structure with the specific surface area of 147.3~187.5 m;/g,and the saturation magnetization value of 17.2~62.3 EMU/g.With the Co content increasing,the catalytic activity of the catalysts increased significantly.The optimized catalyst of Cu_(1-x)Co_(x)Fe_(2)O_(4)had the applicable pH range of 7~9.With the initial antipyrine concentration of 50 mg/L,the catalyst dosage of 0.7 g/L and H_(2)O_(2)dosage of 150 mmol/L,the antipyrine removal reached 93.1%at the initial pH=7 and 94.7%at the initial pH=9,respectively.Different types of refractory organic compounds,such as rhodamine B and acid orangeⅡ,could also be effectively degraded with the catalyst.After 5 cycles of magnetic recovery and reuse of the catalyst,the antipyrine removal could be kept 80%above,indicating that the catalyst had good stability and reusability.The Fenton-like catalyst synthesized in this study provided scientific basis for efficient removal of refractory organic compounds from wastewater.