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

Published online by Cambridge University Press:  03 November 2011

Zhiguo Liu ,
Yuangang Zu ,
Ronghua Meng ,
Zhimin Xing ,
Shengnan Tan ,
Lin Zhao ,
Tongze Sun  and
Zhen Zhou
Zhiguo Liu
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Yuangang Zu*
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Ronghua Meng
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Zhimin Xing
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Shengnan Tan
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Lin Zhao
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Tongze Sun
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
Zhen Zhou
Affiliation:
Key Laboratory of Forest Plant Ecology of Ministry of Education, Northeast Forestry University, Harbin 150040, China Engineering Research Center of Forest Bio-Preparation, Ministry of Education, Northeast Forestry University, Harbin 150040, China
*
Corresponding author. E-mail: nefunano@yahoo.com.cn
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Abstract

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.

Keywords

humic acid (HA)carbonaceous surfacehighly ordered pyrolytic graphite (HOPG)atomic force microscopy (AFM)
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 17 , Issue 6 , December 2011 , pp. 1015 - 1021
Copyright
Copyright © Microscopy Society of America 2011

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