Adsorption of Humic Acid onto Carbonaceous Surfaces: Atomic Force Microscopy Study

作者：Liu Zhiguo; Zu Yuangang^*; Meng Ronghua; Xing Zhimin; Tan Shengnan; Zhao Lin; Sun Tongze; Zhou Zhen

来源：Microscopy and Microanalysis, 2011, 17(6): 1015-1021.

DOI：10.1017/S1431927611012177

• humic acid (HA)
• carbonaceous surface
• highly ordered pyrolytic graphite (HOPG)
• atomic force microscopy (AFM)

The adsorption of humic acid (HA) onto highly ordered pyrolytic graphite (HOPG) surfaces at different concentrations has been studied by atomic force microscopy. When HA concentration was increased from 10 to 1,000 mg/L, HA can sequentially form spherical particles, layered structures, and connected blocks on HOPG surfaces. The findings of the layer structures and small amount of fine chains have been verified and discussed. When HA was acidified by addition of acetic acid, it changed into small rigid particles. These results indicated that HA can be considered as supramolecular associations of self-assembling heterogeneous and relatively small molecules, and a small amount of polymers. The present results are important for understanding HA molecular structures and their adsorption characteristic on carbonaceous surfaces.

• 出版日期2011-12
• 单位东北林业大学