Sulfamethoxazole sorption by cattail and switchgrass roots

Area of Science:

• Environmental Science
• Bioremediation
• Plant Biology

Background:

• Plant roots play a role in attenuating antibiotics through sorption.
• Sulfamethoxazole (SMX) is a common antibiotic pollutant.
• Understanding root-antibiotic interactions is crucial for developing effective phytoremediation strategies.

Purpose of the Study:

• To evaluate sulfamethoxazole (SMX) sorption by cattail and switchgrass roots.
• To determine the kinetics and temperature-dependency of SMX sorption.
• To compare the efficacy of cattail and switchgrass roots in SMX removal.

Main Methods:

• Batch sorption experiments were conducted with varying SMX concentrations (2.5–20 µg L⁻¹) and sampling times (0–24 h).
• Sorption kinetics were analyzed using pseudo-second-order models.
• Experiments were performed at three temperatures (5°C, 15°C, and 25°C) to assess temperature effects.

Main Results:

• SMX sorption by both plant roots followed pseudo-second-order kinetics.
• The sorption rate constant decreased with increasing temperature for both species.
• Switchgrass roots demonstrated higher SMX removal efficiency than cattail roots.

Conclusions:

• Switchgrass roots are more effective than cattail roots for SMX removal.
• Temperature influences the rate of SMX sorption, with lower temperatures generally favoring faster kinetics.
• Switchgrass shows potential for phytoremediation of SMX-contaminated environments.