AlOOH催化臭氧氧化降解愈创木酚的研究

Study on Degradation of Guaiacol by Catalytic Ozonation Using AlOOH as Catalyst

以木素模型物愈创木酚(GL)模拟废水为目标物,采用拟薄水铝石(AlOOH)为催化臭氧氧化的催化剂,研究了催化剂及其投加量、臭氧进气量、初始溶液pH值等因素对200 mg/L愈创木酚溶液的降解效果和COD_(Cr)去除率的影响;通过液相图谱分析和添加羟基自由基捕获剂——叔丁醇(TBA)初步探讨了催化臭氧氧化的降解机理。结果表明,与单独臭氧氧化相比,催化臭氧氧化效果更佳;在臭氧质量浓度13.32mg/L、臭氧进气量0.51 L/min、初始溶液pH值5.4、催化剂投加量5 g/L的条件下,反应40 min后,愈创木酚(200 mg/L)降解率能达到100%,COD_(Cr)去除率能达到89.3%;叔丁醇(TBA)的添加可以证明催化臭氧氧化反应是臭氧与羟基自由基共同作用的结果。

AlOOH was chosen as catalyst for ozonation of guaiacol, the model compound of lignin. A series of experiments were conducted to investigate the influence of oxidation condition on the degradation of guaiacol and CODCr removal efficiency, such as the kind of catalyst, o- zone flow rate, initial pH value of reaction system and catalyst dosage. The reaction mechanism was preliminary studied by liquid chromatog- raphy analysis and addition of hydroxyl radical scavenger tea-butyl alcohol （TBA）. The results showed that compared with sole ozonation, catalytic ozonation could improve the efficiencies of guaiacol degradation and CODcr removal. The degradation rate of guaiacol （200 mg/L） reached 100% and the CODer removal efficiency was 89.3% after 40 rain reaction at pH value of 5.4 when the ozone concentration, ozone flow rate, and the dosage of A1OOH were 13.32 mg/L, O. 51 L/min and 5 g/L, respectively. Both hydroxyl radical and 03 played an impor- tant role on the degradation process of guaiacol.