International Journal of Agricultural Policy and Research

Original Research Article

Assessment of adsorption behavior of humic compound onto carbon nanotubes on soil by provided E4/E6 ratios at different incubation periods

Abdelbagi Mohamedelnour1*, Muhittin Onur Akça2, Kıymet Deniz3 and Sonay Sözüdoğru Ok2

1Department of Plant Production and Processing Technology, Faculty of Agricultural Production and Processing Technology, International University of Africa, Khartoum, Sudan.
2Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Ankara University, Ankara, Turkey.
3Department of Geological Engineering, Faculty of Engineering, Ankara University, Ankara, Turkey.

*Corresponding Author E-mail: soils_star39(at)

Abdelbagi Mohamedelnour

Muhittin Onur Akça

Kıymet Deniz

Sonay Sözüdoğru Ok

Article Number: IJAPR.21.005  |   Pages: 36-42  |   Vol. 9 (2), March 2021   |   DOI:

 Received: December 19, 2020  Accepted: February 13, 2021  Published: March 26, 2021


Adsorption behaviour of humic compounds and functional multi-walled carbon nanotubes (fMWCNT) remains a major concern and is still poorly understood. Indeed, the effect of functional groups on the sorption mechanism is not yet clear. A laboratory incubation experiment was conducted to determine the adsorption behaviour of K-humate to fMCNT. The doses of fMWCNTs applied to soil were C0= 0 %; C1= 0.1 %; C2= 0.5 %, and the concentrations of K-humate were: H0= 0 mg kg-1; H1= 1000 mg kg-1; H2= 2000 mg kg-1. The following treatments were: T1: C0H0 (Control); T2: C1H0; T3: C2H0; T4: C0H1; T5: C0H2; T6: C1H1; T7: C1H2; T8: C2H1; T9: C2H2. The experiment was conducted in a complete randomised design, at three incubation periods (0, 30 and 60 days) with three replications. At the end of each incubation period, the E4/E6 ratios (wavelengths at 465 and 665 nm) and total acidity were measured. The result showed the highest E4/E6 (2.44) was found in the treatment T9 (C2H2) at 60 days of incubation period, while the T1 (control) was lowest (1.64). The total acidity (TA) was larger in T5 (C0H2) than in control treatment (no humic acid application) were 0.5 and 0.16 meq g-1 of dry soil), respectively. The changing of the E4/E6 ratio and total acidity is a good indicator of adsorption mechanism due to changing of molecular weight and carbon network of K-humate. Furthermore, this changing is strong evidence of the direct relationship between E4/E6 ratios and MWCNTs doses, K-humate concentrations during different periods of incubation.


Adsorption, functionalized multi-walled carbon nanotube, K-humate, total acidity

How to Cite this Article

Mohamedelnour A, Akça MO, Deniz K, Ok SS (2021). Assessment of adsorption behavior of humic compound onto carbon nanotubes on soil by provided E4/E6 ratios at different incubation periods. Int. J. Agric. Pol. Res. 9(2):36-42.

Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.

Select Language »