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用XRD、FTIR及TG-DSC等手段对磁选后的天然钒钛磁铁矿进行结构表征,然后在酸性条件下,探讨天然钒钛磁铁矿非均相Fenton法催化降解酸性橙Ⅱ的性能。结果表明:磁选后的天然磁铁矿主要以钛磁铁矿为主,同时含有少量的钛铁矿和绿泥石。降解实验结果表明,天然钒钛磁铁矿催化降解酸性橙Ⅱ的能力明显强于人工合成的单相磁铁矿,并随着钛磁铁矿含量的增加而增强。降解过程以异相Fenton反应为主,动力学曲线符合准一级方程。反应开始210min后,天然钒钛磁铁矿对酸性橙Ⅱ的矿化率约为30%。在降解过程中,苯环和萘环逐步断裂。
The structure of natural vanadium titanomagnetite after magnetic separation was characterized by means of XRD, FTIR and TG-DSC, and then the catalytic performance of heterogeneous Fenton method for the degradation of acid orange Ⅱ by natural vanadium titanomagnetite was investigated under acidic conditions . The results show that the magnetite after magnetic separation is dominated by titanium magnetite and contains a small amount of ilmenite and chlorite. Degradation results show that the ability of natural vanadium titanomagnetite to catalyze the degradation of acidic orange II is obviously stronger than that of synthetic single phase magnetite and increase with the content of titanium magnetite. The degradation process is dominated by heterogeneous Fenton reaction, and the kinetic curve accords with quasi-first-order equation. 210min after the start of the reaction, the natural vanadium titanomagnetite mineralized rate of acidic orange Ⅱ about 30%. In the degradation process, the benzene ring and the naphthalene ring are gradually broken.