Ag/MnO2的制备及其对甲醛的催化降解

Preparation of Ag/MnO2 and catalytic degradation of formaldehyde

以高锰酸钾、双氧水和硝酸银为原料,采用化学沉淀法制备了Ag/MnO2复合催化剂,利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、比表面积(BET)和傅里叶变换红外光谱(FTIR)对Ag/MnO2进行了表征。以Ag/MnO2为催化剂,在室温、常压、无光照条件下对甲醛气体进行了催化降解实验。结果表明,Ag掺杂有效提高了MnO2的催化活性和对甲醛的降解效果,3%-Ag/MnO2 20 g对初始质量浓度为20 mg/m3的甲醛催化降解4 h时,有效降解率达99.61%。

Ag/MnO2 composite catalyst were synthesized using potassium permanganate, hydrogen peroxide and silver nitrate as raw materials. The prepared Ag/MnO2 samples using chemical precipitation method were characterized by X- ray diffraction (XRD), scanning electron microscopy (SEM), brunauer emmett teller (BET) and Fourier transform infrared spectroscopy (FTIR). The catalytic degradation of formaldehyde was conducted under normal temperature, pressure and without illumination. The results showed that Ag doping had effectively enhanced the catalytic activity of MnO2. The degradation efficiency reached 99.61%, while formaldehyde with initial concentration of 20 mg/m3 had been degraded by 20 g 3%-Ag/ MnO2 for 4 h.