多巴胺季铵盐功能化无纺布的制备及其对Cr(Ⅵ)的吸附

Preparation of dopamine quaternary ammonium salt functionalized nonwovens and its adsorption to Cr(Ⅵ)

通过贻贝仿生法制备的材料表面官能团密度低,并且对带负电荷重金属离子没有吸附能力。针对以上问题,提出一种季铵化方法合成了多巴胺季铵盐无纺布。通过吸附实验可知在pH为3时吸附性能最强,能除去95%以上的Cr(Ⅵ)。拟合得到的吸附量最高为31.92 mg/g。XPS分析说明吸附是-NH和季铵盐基团的作用。此外季铵化使再生性能提高,在Cr(Ⅵ)吸附去除领域具有广阔的应用前景。

The low density of surface functional groups and the lack of adsorption capacity for negatively charged heavy metal ions are the disadvantages of mussel biomimetic chemical preparation materials.In order to solve the above problems,a dopamine quaternary ammonium salt non-woven fabric adsorbent was prepared by a quaternization method.The adsorption experiment results showed that the maximum adsorption capacity of Cr(Ⅵ)was achieved at pH=3,and the removal efficiency reached 95%.The theoretical maximum adsorption capacity obtained by fitting was 31.92 mg/g.The XPS results showed that the adsorption of Cr(Ⅵ)was related to the quaternary ammonium salt groups and protonated amino groups.In addition,the quaternary ammonium improved the regeneration performance.Dopamine quaternary ammonium salt non-woven show broad application prospects in the field of Cr(VI)adsorption and removal.