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Tripolyphosphate-functionalized cellulose: A green solution for cadmium contamination.

Gülseren Demir1, Özgür Arar1, Müşerref Arda1

  • 1Chemistry Department, Ege University, Izmir, Turkey.

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Summary

A novel tripolyphosphate-tethered cellulose sorbent effectively removes cadmium (Cd2+) from water, achieving 99% removal with high capacity and reusability. This ion exchange material shows promise for environmental remediation.

Keywords:
BiopolymerCadmium removalIon exchangeTPP-Tethered cellulose

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Cadmium (Cd2+) contamination poses significant risks to aquatic ecosystems and human health.
  • Developing efficient and cost-effective sorbent materials is crucial for heavy metal remediation.

Purpose of the Study:

  • To synthesize and characterize a tripolyphosphate-tethered cellulose sorbent for cadmium removal.
  • To evaluate the sorption performance, kinetics, thermodynamics, and reusability of the developed sorbent.

Main Methods:

  • Synthesis of tripolyphosphate-tethered cellulose.
  • Characterization using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).
  • Batch sorption experiments to determine optimal conditions, capacity, kinetics, and selectivity.
  • X-ray photoelectron spectroscopy (XPS) for mechanism elucidation.

Main Results:

  • The sorbent achieved 99% Cd2+ removal at a low dosage (0.05 g).
  • Optimal sorption occurred at pH 4-6, with rapid kinetics (equilibrium in 1 minute) and high capacity (18.03 mg/g at 50 °C).
  • Langmuir isotherm and thermodynamic studies indicated spontaneous, endothermic monolayer sorption, with ion exchange via P3O105- groups as the primary mechanism.

Conclusions:

  • Tripolyphosphate-tethered cellulose is a highly efficient sorbent for cadmium removal from aqueous solutions.
  • The sorbent demonstrates excellent performance, rapid kinetics, high capacity, and reusability.
  • Ion exchange mechanism involving P3O105- groups is confirmed, highlighting its potential for effective cadmium remediation.