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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。
Under the condition of ultrasonic irradiation, nanometer MnO2 catalyst was prepared by liquid-phase precipitation method, MnO2 was loaded on polyvinylidene fluoride (PVDF) hollow fiber membrane by impregnation method to obtain MnO2 / PVDF hollow fiber membrane composite, and the formaldehyde was adsorbed and degraded at room temperature . The results show that the prepared nano-MnO2 has a γ crystal form and a particle size of about 160 nm. The MnO2 particles are uniformly distributed on the surface and the interior of the hollow fiber membrane, and the composite has better purification effect on the formaldehyde. The concentration of the initial formaldehyde solution is At 8.2 mg / L, the formaldehyde concentration decreased by 7.9 mg / L after 12 days. When the initial concentration of formaldehyde solution in the range of 5.2mg / L to 24.6mg / L, with the initial concentration of formaldehyde solution increases, the unit of time to remove formaldehyde gradually increased.