【摘要】 采用一步还原法和冰模板法合成纯二氧化锰气凝胶,采用纤维素纳米纤维（CNF）杂化增强纯二氧化锰气凝胶材料的机械性能,通过表征技术,探究其形成机理和微观作用机制,分析杂化气凝胶对NH₃的吸附效果.结果表明,在材料内部,CNF作为骨架,分散MnO₂纳米颗粒,MnO₂与CNF表面羟基通过形成氢键结合在一起,有效提高了材料的机械强度,比表面积为56.50cm²/g ¹,平均孔径为9.32nm;对NH₃的吸附为物理吸附和化学吸附共同作用,NH₃分子依靠范德华作用力进入气凝胶孔洞内部,从而被吸附位点所吸附而留存在材料的内部;当环境温度为15℃、相对湿度为50%时,气凝胶材料对10×10^-6的氨气6h吸附率达到99.7%.更多还原

【Abstract】 Pure manganese dioxide aerogel was synthesized by one-step reduction method and ice template method.Cellulose nanofibers （CNF） were used to hybridise and enhance the mechanical properties of pure manganese dioxide aerogel materials.Through characterization techniques,the formation mechanism and microscopic mechanism of the hybrid aerogel were explored.The adsorption effect of hybrid aerogel on NH₃ was analyzed.Inside the material,CNFs acted as skeleton to disperse MnO₂ nanoparticles,while MnO₂ and hydroxyl groups on CNFs surface were combined by forming hydrogen bonds,which effectively improved the mechanical strength of the material.It’s specific surface area was 56.50cm²/g,and it’s average pore diameter was 9.32nm.The adsorption of NH₃ was the combined action of physical adsorption and chemical adsorption.NH₃ molecules entered the aerogel pores by van der Waals forces,and were absorbed by the adsorption sites and retained in the interior of the material.When the ambient temperature was 15℃and the relative humidity was 50%,the adsorption effect of the hybrid aerogel on 10×10^-6 NH₃ for 6h was99.7%.更多还原