Environmental Science and Pollution Research

, Volume 24, Issue 30, pp 23744–23752 | Cite as

Characterization and Cu sorption properties of humic acid from the decomposition of rice straw

  • Yongbo Qi
  • Jun Zhu
  • Qingling Fu
  • Hongqing Hu
  • Xingmin Rong
  • Qiaoyun Huang
Research Article


Humic acid (HA) derived from rice straw decomposed for 1 (HA-1), 3 (HA-3), 6 (HA-6) and 12 (HA-12) months was characterized by potentiometric titration and solid-state cross-polarization magic-angle spinning 13C nuclear magnetic resonance spectroscopy (CPMAS 13C NMR). The sorption of Cu on examined HA was investigated using a combination of batch sorption, isothermal titration calorimetry (ITC) and sequential desorption. Results showed that the functional group content and the humification degree of HA tended to increase with increasing decomposition time especially in the latter stage of examined decomposition period. Cu sorption on HA was a rapid process that occurred within the first 1 h and the sorption capacity increased from 245.4 mmol kg−1 on HA-1 to 294.6 mmol kg−1 on HA-12. The sorption of Cu was endothermic, spontaneous and the randomness was increased during Cu sorption. Sorbed Cu on examined HA can be hardly released by NH4Ac but nearly fully released by EDTA. Forming inner-sphere complexes was the main mechanism of Cu sorption on examined HA. This study could provide valuable information for a better understanding on the environmental impacts of the decomposition of organic waste.


Sorption Cu Humic acid Decomposition Rice straw 



We are grateful to the Natural Science Foundation of China (41201232), the China Agriculture Research System—Green Manure (CARS-22) and the Fundamental Research Funds for the Central Universities (Program number 2662017JC009) for the financial support on the research.


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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Yongbo Qi
    • 1
  • Jun Zhu
    • 1
  • Qingling Fu
    • 1
  • Hongqing Hu
    • 1
  • Xingmin Rong
    • 1
  • Qiaoyun Huang
    • 1
  1. 1.Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources and EnvironmentHuazhong Agricultural UniversityWuhanChina

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