Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.
Microsc Microanal. 2011 Dec;17(6):1015-21. doi: 10.1017/S1431927611012177. Epub 2011 Nov 3.
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.
通过原子力显微镜研究了腐殖酸（HA）在不同浓度下在高度有序的热解石墨（HOPG）表面上的吸附。当 HA 浓度从 10 增加到 1000mg/L 时，HA 可以依次在 HOPG 表面上形成球形颗粒、层状结构和连接块。已经验证和讨论了层状结构和少量细链的发现。当 HA 通过添加乙酸酸化时，它变成了小的刚性颗粒。这些结果表明，HA 可以被认为是自组装的异质和相对小分子以及少量聚合物的超分子缔合。这些结果对于理解 HA 的分子结构及其在碳质表面上的吸附特性非常重要。
