ADSORPTION EFFICIENCY OF CARBON MATERIALS DERIVED FROM PET AND PE WASTE TOWARDS CU2+ IONS IN WATER
Keywords:
carbon adsorbent, polyethylene terephthalate (PET), polyethylene (PE), copper ions (Cu²⁺), adsorption kinetics, adsorption isotherm, oxidized graphite, wastewater treatment, polymer waste, Langmuir model, Freundlich model.Abstract
This study investigates the adsorption efficiency of carbon adsorbents synthesized from PET and PE polymer waste by carbonization at 700°C toward Cu²⁺ ions in aqueous solutions. Unmodified carbons (PET-700, PE-700) and oxidized graphite-modified samples (PET-OG10, PE-OG10) were comparatively evaluated.
Adsorption kinetics and equilibrium isotherms were studied over 1–24 hours. PET-OG10 showed the highest performance, reducing Cu²⁺ concentration from 30 to 1.3 mg/L after 24 hours (removal efficiency >95.6%). Langmuir maximum adsorption capacities were 3.38, 2.50, 40.00, and 19.88 mg/g for PET-700, PE-700, PET-OG10, and PE-OG10, respectively. OG modification increased adsorption capacity up to 11-fold and is attributed to enhanced specific surface area and active site density.
The synthesized adsorbents demonstrate strong potential as cost-effective materials for heavy metal removal from industrial wastewater.
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