中空纤维膜负载纳米MnO_2制备微催化装置

The catalytic microreactor of hollow fiber membrane loaded nanometer MnO_2

在超声辐射条件下利用液相沉淀法制备纳米MnO2催化剂,利用浸渍法将MnO2负载到聚偏氟乙烯(PVDF)中空纤维膜上,得到MnO2/PVDF中空纤维膜复合物,在室温下吸附降解甲醛。结果表明,所制得纳米MnO2为γ晶型,粒径约160nm,MnO2颗粒负载于中空纤维膜表面和内部,分布较为均匀,复合物对甲醛具有更好的净化效果,初始甲醛溶液的浓度为8.2mg/L时,12d后甲醛浓度降低了7.9mg/L。当初始甲醛溶液浓度在5.2mg/L到24.6mg/L范围内时,随着初始甲醛溶液浓度的增大,单位时间内去除甲醛量逐渐增大。

Nanometer MnO2 catalyst were prepared in the condition of ultrasonic radiation with the method of liquid precipitation, the MnO2/PVDF hollow fiber membrane composite was obtained by sinking the hollow fiber membrane into suspended nanometrie MnO2 solution, and applied to adsorb and decompose formaldehyde at room temperature. The results showed that the product was nanocrystal of γ-MnO2. The average particle size of prepared MnO2 was about 160nm, MnO2 nano-particles loaded on the fiber surface and inside of the fibers were distributed more evenly, the composite has an optimum effect on purification of formaldehyde. The formaldehyde content decreased by 7. 9 mg/L after 12 days, as the initial concentration of formaldehyde was 8. 2 mg/L. The removal amount was increased when the initial concentration of formaldehyde solution in the range of 5.2mg/L to 24. 6mg/L.