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Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency

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Highly efficient engineered waste eggshell-fly ash for cadmium removal from aqueous solution.

Adina-Elena Segneanu¹, Catalin Nicolae Marin², Gabriela Vlase³

¹Institute for Advanced Environmental Research -West University of Timisoara (ICAM -WUT), Oituz nr. 4, Timisoara, Romania.

Scientific Reports

|June 11, 2022

Summary

Engineered nano-adsorbents from waste eggshells and fly ash efficiently remove cadmium from water. This cost-effective, reusable material offers a sustainable solution for wastewater remediation.

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Area of Science:

Environmental Science
Materials Science
Chemical Engineering

Background:

Sustainable waste and water management are crucial for the EU's circular economy policy.
Developing inexpensive, high-performance adsorbents is vital for wastewater treatment and environmental remediation.
Reusing waste materials in water treatment aligns with human health and sustainable development goals.

Purpose of the Study:

To develop a novel, cost-effective nano-engineered adsorbent (EFM) for cadmium removal from aqueous solutions.
To functionalize industrial and food waste (eggshell and fly ash) with magnetic nanoparticles.
To evaluate the adsorbent's efficiency, reusability, and adsorption mechanism for cadmium remediation.

Main Methods:

Synthesized a nano-engineered adsorbent (EFM) using waste eggshell and fly ash functionalized with magnetite nanoparticles.
Characterized the EFM using BET, FT-IR, SEM, XRD, and TGA to assess its properties.
Conducted batch experiments to optimize adsorption parameters (pH, temperature, contact time, dosage, concentration) and analyzed adsorption kinetics and isotherms.

Main Results:

The EFM exhibited a significantly increased surface area after functionalization.
Maximum cadmium removal efficiency of 99.9% was achieved under optimal conditions (pH 6.5, 120 min, 0.25 g adsorbent).
Adsorption followed the Freundlich model (multi-molecular layer) and pseudo-second-order kinetics (chemisorption), indicating a spontaneous, endothermic process.

Conclusions:

The developed nano-engineered adsorbent (EFM) is a highly efficient, cost-effective, and reusable material for cadmium removal from wastewater.
Waste functionalization with magnetic nanoparticles offers a promising strategy for developing advanced materials for environmental remediation.
This study contributes to waste recovery knowledge, supporting the creation of performant and inexpensive adsorbents for sustainable water management.