碱改性ZSM-5负载金属组分催化臭氧降解工业废水

Catalytic ozonation degradation of industrial wastewater by alkaline modified ZSM-5 supported metal component

采用氢氧化钠对ZSM-5分子筛进行碱改性,并结合SEM、XRD、BET、FT-IR、UV-Vis等技术对其进行了分析。利用改性后的ZSM-5分子筛负载Fe、Mn、Co等活性组分制备了Fe/ZSM-5(1)、Mn/ZSM-5(1)、Co/ZSM-5(1)负载型催化剂,并用其催化臭氧降解工业废水,考察了3种催化剂的催化降解效果。结果表明,Co/ZSM-5(1)负载型催化剂的催化降解效果最佳。处理200 mL COD为400500 mg/L的工业废水,当Co/ZSM-5(1)催化剂投加量为1.0 g/L,温度为40℃,pH为67,臭氧质量浓度为4 mg/L,臭氧通量为25 L/h,反应60 min时,废水COD降解率可达89.7%。该催化剂性能较为稳定,循环使用4次后仍具有较好的COD降解效果。

The ZSM-5 molecular sieve was modified by sodium hydroxide,and analyzed by SEM,XRD,BET,FT-IR,UV-Vis and other characterization techniques. Fe/ZSM-5(1),Mn/ZSM-5(1) and Co/ZSM-5(1) supported catalysts were prepared by using modified ZSM-5 molecular sieve supported with active components such as Fe,Mn and Co.The prepared catalysts were used to catalyze ozone degradation of industrial wastewater to investigate their catalytic degradation effects. The results showed that Co/ZSM-5(1) supported catalysts had the best catalytic degradation effect. The COD degradation ratio of wastewater could reach 89.7% at conditions of 200 m L of industrial wastewater with COD of 400-500 mg/L,Co/ZSM-5(1) catalyst dosage 1.0 g/L, temperature 40 ℃,pH 6-7,ozone concentration4 mg/L,ozone flux 25 L/h and time 60 min. Moreover,the performance of catalyst was relatively stable,and it still had a good wastewater COD degradation effect after 4 times recycle usage.