MnOx/ACF的制备及制备条件对UDMH降解性能影响

Preparation of MnO_x/ACF and influence of preparation conditions on degradation performance of UDMH

采用甲醇原位还原KMnO_4,室温条件下在阳离子表面活性剂CTAB(十六烷基三甲基溴化铵)的辅助下将锰氧化物(MnO_x)负载于活性炭纤维(ACF)表面,制得MnO_x/ACF复合材料。分别采用扫描电镜(SEM)、X射线衍射(XRD)对MnO_x/ACF进行表征,并将制得的MnO_x/ACF用于UDMH(偏二甲肼)废水处理。SEM结果显示:随负载量增加,MnO_x/ACF表面MnO_x形貌由疏松地衣状转变为堆叠的纳米球状体。XRD表征分析表明:负载的无定型MnO_x具有类似水钠锰矿结构。制备条件对UDMH降解效果影响的实验表明:材料表面MnO_x负载量随KMnO_4添加量的增加而增加,UDMH去除率也随之增加,但当添加量超过最优值时,其去除率并无明显上升;甲醇添加量过多不利于MnO_x负载,导致UDMH去除率降低;适量添加CTAB有利于MnO_x负载。

By using methanol in situ reduction of KMnO4, the manganese oxide（MnOx） was supported on the surface of activated carbon fiber（ACF） assisted by cationic surfactant CTAB（cetyl trimethyl ammonium bromide） at room temperature, the MnOx/ACF composite was prepared. The MnOx/ACF was characterized by scanning electron microscopy（SEM） and X ray diffraction（XRD）. The prepared MnOx/ACF was used for UDMH（unsymmetrical dimethyl hydrazine） wastewater treatment. The SEM result shows that the morphology of MnOx on MnOx/ACF surface was transformed from loose lichen like shape to stacked nano spherical body. The XRD characterization analysis result shows that the supported amorphous MnOx possesses a structure similar to birnessite. It is shown by the experiment for influence of preparation conditions on the degradation effect of UDMH that with increase of KMnO4 addition amount, the MnOx loading amount on the material surface increases, and the removal rate of UDMH also increases. But when the addition amount exceeds the optimal value, its removal rate does not increase significantly. The excessive addition amount of methanol is not beneficial to MnOx loading and can result in reducing the removal rate of UDMH. The appropriate addition amount of CTAB is beneficial to MnOx loading.