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分别以CO(NH_2)_2、Na_2C_2O_4、Na_2CO_3和(NH_4)_2CO_3为沉淀剂,采用水热-热分解法制备黑色Co_3O_4颗粒。通过XRD、SEM对样品的结构和形貌进行了分析。结果表明,选用CO(NH_2)_2、Na_2C_2O_4、Na_2CO_3和(NH_4)_2CO_3为沉淀剂所制备的Co_3O_4分别呈片层堆叠状、棒状、薄的纳米片状和具有二级结构的绣球状。通过降解甲基橙溶液研究了沉淀剂对Co_3O_4光催化性能的影响,结果发现,以CO(NH_2)_2、Na_2C_2O_4、Na_2CO_3和(NH_4)_2CO_3为沉淀剂所制备的Co_3O_4对甲基橙溶液的降解率分别达到48%、92%、95%和97%,以(NH_4)_2CO_3为沉淀剂所制备的Co_3O_4由于具有二级结构的绣球状结构,与溶液的接触面积大,有利于对光的吸收和利用,对甲基橙的催化降解效果最好,在30 min降解率可达90%。
CO (NH_2) _2, Na_2C_2O_4, Na_2CO_3 and (NH_4) _2CO_3 were used as precipitants respectively to prepare black Co_3O_4 particles by hydrothermal-thermal decomposition. The structure and morphology of the samples were analyzed by XRD and SEM. The results show that Co_3O_4 prepared by using CO (NH_2) _2, Na_2C_2O_4, Na_2CO_3 and (NH_4) _2CO_3 as the precipitating agent has the shape of lamina, rod, thin nanosheet and hydrangea with secondary structure. The effect of precipitant on the photocatalytic activity of Co_3O_4 was studied by degradation of methyl orange solution. It was found that the degradation of methyl orange solution by Co_3O_4 prepared with CO (NH_2) _2, Na_2C_2O_4, Na_2CO_3 and (NH_4) _2CO_3 as precipitants (NH_4) _2CO_3 as the precipitating agent. Because of the secondary structure of the hydrangea-like structure, the contact area with the solution is large, which is favorable for the absorption of light And utilization, the best catalytic degradation of methyl orange, 30 min degradation rate of up to 90%.