Separation of copper ions by nanocomposites using adsorption process

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Copper (Cu²⁺) ion contamination poses significant environmental and health risks.
• Developing efficient and reusable adsorbents is crucial for water remediation.
• Nanocomposite materials offer promising properties for heavy metal removal.

Purpose of the Study:

• To synthesize and evaluate a novel nanocomposite adsorbent (GFLE) for Cu²⁺ ion removal.
• To optimize adsorption parameters using statistical methods.
• To investigate the adsorption mechanism and thermodynamic properties.

Main Methods:

• Synthesis of graphene oxide modified with magnetite nanoparticles and Lauric acid containing ethylenediaminetetraacetic acid (GFLE).
• Optimization of adsorption conditions (pH, concentration, temperature, time) using Central Composite Design (CCD) and Response Surface Methodology (RSM).
• Analysis of adsorption equilibrium using isotherm models (Freundlich) and kinetics (second-order), and thermodynamic studies.

Main Results:

• GFLE demonstrated high efficiency in removing Cu²⁺ ions.
• Optimal adsorption conditions were identified: 105 min, 40 °C, 280 mg L^-1 initial concentration, and pH 1.
• The Freundlich isotherm and second-order kinetics models best described the adsorption process, indicating physical adsorption and ion exchange.
• The process was spontaneous, feasible, and endothermic.
• GFLE showed good reusability for up to 3 cycles.

Conclusions:

• GFLE is a highly effective and reusable adsorbent for Cu²⁺ ion removal from aqueous solutions.
• Statistical optimization using RSM significantly enhanced the adsorption performance.
• The study provides valuable insights into the adsorption mechanism and thermodynamic feasibility for practical water treatment applications.