室温下介孔MnO2降解低浓度甲醛的研究

Degradation of low concentration formaldehyde by mesoporous MnO2 at room temperature

摘要:

本文以KMnO₄和P123为原料采用溶胶-凝胶法在不同条件下制备了介孔MnO₂。研究了反应物比和pH对催化剂结构和催化降解性能的影响。溶胶-凝胶法制备介孔MnO₂的最佳条件为：原料配比为10：1,pH值为7。合成材料的结构和性能采用XRD、N₂吸脱附、FT-IR的测试方法表征,结果表明P123和KMnO₄合成的介孔MnO₂具有较大的比表面积和孔径,且有良好的HCHO催化降解性能。最后讨论了介孔MnO₂催化氧化HCHO的影响因素,发现在pH7 的情况下最有利于介孔MnO₂的活性稳定；在原料比为10：1情况下生成的介孔MnO₂比表面积较大,催化降解性能较强,在10h内保持在对甲醛的降解率为95%以上。

Abstract:

Mesoporous MnO₂ was prepared by sol-gel method using KMnO₄ and P123. The structure and properties of the synthesized materials were characterized by XRD, N₂ adsorption and desorption, and FT-IR. The effects of reactant ratio and pH on the catalytic oxidation performance of the product were investigated. The optimum conditions of the preparation were as follows: the ratio of KMnO₄ and P123 was 10:1 and the pH was 7. The results shown that mesoporous MnO₂ has good catalytic oxidation performance to HCHO. Finally, the influencing factors of the catalytic oxidation of HCHO by mesoporous MnO₂ were discussed. The specific surface area of mesoporous MnO₂ (pH7-10:1) was largest. The oxidation performance was the strongest, and the degradation rate of formaldehyde was maintained at 95 %.