Effect of starch/CNT on biodesulfurization using molecular dynamic simulation

Area of Science:

• Environmental Science
• Biotechnology
• Materials Science

Background:

• Fossil fuels are primary energy sources, but sulfur oxide emissions cause significant air pollution.
• Biodesulfurization (BDS) offers a biological solution to remove sulfur from crude oil fractions.
• Dibenzothiophene (DBT) is a recalcitrant organic sulfur compound requiring efficient removal methods.

Purpose of the Study:

• To investigate the effects of starch/carbon nanotubes (CNTs) on the biodesulfurization of DBT.
• To utilize molecular dynamic simulations to understand the interaction between starch/CNTs and the BDS process.
• To evaluate the efficiency enhancement of DBT removal in the presence of starch/CNTs and Rhodococcus erythropolis.

Main Methods:

• Molecular dynamic simulations were employed to model the BDS process over 5 nanoseconds.
• Key parameters analyzed included cell length, energy, dynamic temperature, DBT concentration, and radial distribution function (RDF).
• Comparisons were made between systems with and without starch/CNTs.

Main Results:

• Simulations demonstrated that starch/CNTs contribute to a stable equilibrium state in the BDS system.
• The radial distribution function (RDF) indicated enhanced and prolonged desulfurization activity by microorganisms.
• The presence of starch/CNTs alongside Rhodococcus erythropolis increased DBT removal efficiency to 85%, compared to 35.44% without nanoparticles.

Conclusions:

• Starch/CNTs act as effective catalysts in the biodesulfurization of DBT.
• Molecular dynamic simulations provide valuable insights into the mechanisms of enhanced microbial desulfurization.
• The combined approach of starch/CNTs and microbial treatment shows significant potential for industrial application in cleaner fuel production.