Catecholamine Coated Maghemite Nanoparticles for Asphaltene Adsorption/Desorption Process

Document Type : Research Paper

Authors

Department of Chemical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

In this study, a nano-layer polydopamine (PDA) coated superparamagnetic maghemite nanoparticles (MNPs) was applied to investigate the asphaltene adsorption-desorption behavior using a model solution. In this process, Fourier-transform infrared spectrum (FT-IR) spectroscopy of the polydopamine/MNP core/shell (MNP@PDA) before and after asphaltene adsorption was indicated the attachment of asphaltene molecules on the polymeric nano-adsorbent surface. The isotherms and kinetics of the asphaltene adsorption process on the MNP@PDA were studied. The good prediction of asphaltene adsorption by the modified Langmuir model indicated that adsorption occurs on an MNP@PDA surface by multilayer adsorption. Also, within the kinetic models, the double-exponential model can fit the experimental data well. The obtained results revealed that about 90% removal for asphaltene happened within 30 min which can be acceptable. The results of this study showed that natural polymers can be used for surface modification of nanoparticles and use it successfully for asphaltene adsorption from prepared asphaltene-toluene solution.

Keywords


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K
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ΔS (J/mol.K)
R2
800
298
96687.61
28.45
-2.47
103.12
0.9926
313
99709.10
29.96
333
106507.45
32.06
2000
298
241719.04
30.72
-2.47
111.3
0.9926
313
249272.76
32.35
333
268157.06
34.62
4500
298
543867.84
32.73
-2.47
118.06
0.9926
313
560863.71
34.46
333
603353.38
36.86
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Journal of Chemical and Petroleum Engineering 2020, 55(1): 177-187 187
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Volume 55, Issue 1
June 2021
Pages 177-187
  • Receive Date: 29 November 2020
  • Revise Date: 24 January 2021
  • Accept Date: 26 January 2021
  • First Publish Date: 13 April 2021