Amitriptyline removal using palygorskite clay.

Area of Science:

• Environmental Science
• Materials Science
• Analytical Chemistry

Background:

• Pharmaceuticals, including amitriptyline (AMI), are increasingly detected in surface and wastewater.
• Understanding the environmental fate and transport of these contaminants is crucial.

Purpose of the Study:

• To investigate the removal of amitriptyline (AMI) using palygorskite clay (PFl-1).
• To evaluate the adsorption capacity and mechanism of AMI on PFl-1 under various conditions.

Main Methods:

• Adsorption experiments were conducted under different physico-chemical conditions.
• Instrumental analyses, including X-ray diffraction, were used to characterize the adsorption process.
• Langmuir isotherm modeling was applied to quantify adsorption.

Main Results:

• Palygorskite clay (PFl-1) exhibited a high adsorption capacity for AMI (0.168 mmol g⁻¹ at pH 6-7).
• Adsorption equilibrium was reached rapidly within 15 minutes.
• X-ray diffraction indicated surface uptake on palygorskite and interlayer uptake within the smectite component.

Conclusions:

• Palygorskite clay (PFl-1) demonstrates significant potential as an effective adsorbent for removing amitriptyline from wastewater.
• The presence of smectite within palygorskite influences contaminant uptake, highlighting its importance in adsorbent performance assessment.
• Palygorskite clays can act as effective sinks for cationic pharmaceuticals in arid region environments.