Absorption of polycyclic aromatic hydrocarbons by a highly absorptive polymeric medium

Area of Science:

• Environmental Science
• Materials Science
• Chemical Engineering

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants often released during oil spills.
• Effective remediation strategies are crucial for mitigating the environmental impact of PAHs on aquatic ecosystems.

Purpose of the Study:

• To evaluate the efficacy of lightly cross-linked polymeric beads for absorbing PAHs from fresh and salt water.
• To determine the absorption kinetics and influencing factors, such as temperature and molecular volume, on PAH uptake.

Main Methods:

• Simulated oil-spill scenario using a layer of PAHs on water surfaces.
• Application of polymeric beads to the PAH layer and examination of absorption over time and temperature.
• Analysis of uptake kinetics using first-order reaction rates and correlation with PAH molecular volume.

Main Results:

• Polymeric beads achieved exhaustive absorption, removing approximately 86% of PAHs within 120 seconds.
• Uptake kinetics followed first-order reaction rates, with absorption rates varying from 0.0085 s^-1 to 0.0325 s^-1.
• PAH absorption was significantly influenced by molecular volume, with optimal uptake for volumes between 130 ų and 190 ų.

Conclusions:

• Lightly cross-linked polymeric beads exhibit high affinity and rapid absorption of PAHs.
• The beads are effective remediation agents for PAHs in both fresh and salt water under diverse environmental conditions.
• Molecular volume is a key determinant of PAH absorption efficiency by the polymeric beads.