Abstract: Azo dyes, with high chromaticity, are difficult to degrade by traditional methods to meet the industrial emission standard, which become great threat to the environment. In this paper, Acid Red B, as a selected azo dye, was degraded with advanced oxidation process by Fe₃O₄ activating peroxymonosulfate (PMS) with ultrasound irradiation. This study focus on the effect of parameters on the degradation rate such as the addition of Fe₃O₄, the concentration of PMS, the ultrasound power and frequency, the initial concentration of Acid Red B and the initial pH of the solution. The optimized operating parameters are Fe₃O₄ 1.0g/L, PMS 60 mmol/L, ultrasound frequency 50kHz, ultrasound power 80W. This method can be applied in a wide range of pH from 3.5 to 8.5 and is capable of degrading high concentration of Acid Red B up to 1g/L. The study also investigated the reusability of the catalyst. The catalyst was recycled for 3 times and the decoloration rate still remained above 95%. These results can be applied to the industrial process of wastewater treatment of azo dyes.

Key words: peroxymonosulfate, Fe₃O₄, ultrasound, Acid Red B, advanced oxidation process

摘要： 含偶氮型染料废水色度高、降解困难，对环境危害大，采用传统水处理方法难以达到严格的工业废水排放要求。本文选取典型偶氮染料酸性红B为研究对象，采用超声辅助Fe₃O₄活化过一硫酸盐的高级氧化方法进行处理。以酸性红B染料废水的色度去除率为指标，研究Fe₃O₄投加量、PMS投加量、超声功率、超声频率、初始染料浓度、溶液初始pH等参考对降解效果的影响规律及该法的适用范围。实验获得最优的酸性红B处理条件为Fe₃O₄ 1.0g/L，PMS 60mmol/L，超声频率50kHz，超声功率80W。结果表明，该法可在pH为3.5～8.5范围中适用，能处理初始浓度1g/L酸性红B溶液。实验还研究了催化剂循环利用性能，发现重复3次的时候色度去除率仍然可以保持在95%以上。该研究结果可为偶氮型染料工业废水的处理提供技术指导。

关键词: 过一硫酸盐, 四氧化三铁, 超声, 酸性红B, 高级氧化法