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分别采用超声辅助热沉淀法和水热法制备了片状纳米CuO(Cu O-s)和棒状纳米CuO(CuO-r)催化剂。以X-射线衍射仪(XRD)、透射电镜(TEM)手段对产物进行了表征。考察了两种形貌的纳米CuO催化剂在碱性条件下催化氧化风化煤制取腐植酸的活性。利用元素分析、红外光谱和E_4/E_6值分析研究了腐植酸产物的结构和性质,讨论了两种形貌的纳米CuO催化氧化对腐植酸产率、元素组成和官能团种类的影响。结果表明,两种形貌的纳米CuO均可显著提高腐植酸的产率,以CuO-r催化活性最高。与仅加入H_2O_2相比,加入CuO-r催化剂,腐植酸产率可提高16.36%,并且催化氧化所得腐植酸与天然腐植酸具有相似的元素组成和结构特征。
Flake nano-CuO (Cu O-s) and nano-CuO (CuO-r) catalysts were prepared by ultrasonic-assisted thermal precipitation and hydrothermal method respectively. The product was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The CuO catalysts with two morphologies were investigated for catalytic oxidation of humic coal to humic acid under alkaline conditions. The structure and properties of humic acid were studied by elemental analysis, infrared spectroscopy and E_4 / E_6 value analysis. The effects of CuO catalytic oxidation on the yield, elemental composition and functional groups of humic acid were discussed. The results showed that CuO-r had the highest catalytic activity of nano-CuO with both morphologies. Compared with adding only H 2 O 2, the yield of humic acid can be increased by 16.36% by adding CuO-r catalyst, and the obtained humic acid by catalytic oxidation has similar elemental composition and structural characteristics with natural humic acid.