Innovative low-cost engineered adsorbents based on waste eggshell for nickel removal from aqueous solutions

Author:

SEGNEANU Adina-Elena1,TRUSCA Roxana2,CEPAN Claudiu3,MIHAILESCU Maria4,GROZESCU Ioan3,MUNTEAN Cornelia5,HEREA Daniel Dumitru6,SALIFOGLOU Athanasios7

Affiliation:

1. Institute for Advanced Environmental Research-West University of Timisoara (ICAM-WUT);

2. National Center for Micro and Nanomaterials, Politehnica University of Bucharest

3. Polytechnic University of Timişoara

4. Research Institute for Renewable Energy

5. University Politehnica Timisoara

6. National Institute of Research and Development for Technical Physics

7. Aristotle University of Thessaloniki, School of Chemical Engineering

Abstract

Abstract In contemporary sustainable economy, innovation is prerequisite to waste recycling into new efficient materials, designed to minimize pollution and conserve non-renewable natural resources. Water pollution is a global problem with health, quality of life, and food safety concerns. Thus, waste conversion into cheap, efficient adsorbent materials with high reusability is a challenge in wastewater recycling. In that context, starting from eggshell waste in this study, two new low-cost engineered adsorbents were prepared for the retrieval of nickel from aqueous solutions. Scanning electron microscopy (SEM) results show that, in the first eggshell-zeolite (EZ) adsorbent, the zeolite nanoparticles were loaded in the eggshell pores. The preparation for the second (iron(III) oxide-hydroxide)-eggshell-zeolite (FEZ) adsorbent led to double functionalization of the eggshell base with the zeolite nanoparticles, upon simultaneous loading of the pores of the eggshell and zeolite surface with FeOOH particles. Structural modification of the eggshell led to a significant increase of the specific surface, as confirmed by BET analysis. These features enabled the proposed adsorbents (EZ and FEZ) to remove nickel from aqueous solutions with high performance and adsorption capacities 321.1 mg/g and 287.9 mg/g, respectively. The results indicate that nickel adsorption on EZ and FEZ is a multi-molecular layer, spontaneous, and endothermic process. Concomitantly, desorption results reflect high reusability of these two adsorbents, collectively suggesting the use of waste in the design of new, low-cost, and highly efficient engineered adsorbents for environmental bioremediation

Publisher

Research Square Platform LLC

Reference71 articles.

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4. Future greenhouse gas emissions from metal production: gaps and opportunities towards climate goals;Yokoi R;Energy Environ. Sci.,2022

5. EFSA Panel on Contaminants in the Food Chain (CONTAM). Update of the risk assessment of nickel in food and drinking water;Schrenk D;EFSA J,2020

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