Copper removal from wastewater by a chitosan-based biodegradable composite

Area of Science:

• Materials Science
• Environmental Science
• Biotechnology

Background:

• Heavy metal contamination, particularly copper ions (Cu2+), poses significant risks to aquatic ecosystems and human health.
• Conventional methods for heavy metal removal often involve non-biodegradable materials or expensive adsorbents, necessitating sustainable alternatives.
• Chitosan, a biopolymer derived from chitin, shows promise as an adsorbent due to its functional groups and biodegradability.

Purpose of the Study:

• To develop and evaluate a biodegradable chitosan-based biocomposite for efficient copper ion removal from aqueous solutions.
• To investigate the adsorption capacity, reusability, and potential application of the developed material in water purification.

Main Methods:

• Chitin was extracted from shrimp waste and deacetylated to obtain chitosan.
• Chitosan was embedded in a biodegradable prepolymer matrix and extruded into porous cylindrical pellets.
• The biocomposite's performance in removing copper ions was tested in mini-reactors, assessing adsorption capacity and reusability.

Main Results:

• The chitosan-based biocomposite demonstrated a high copper ion removal capacity of 62.5 mg Cu2+ per gram of adsorbent.
• The material exhibited reusability over several cycles with a reduced hydraulic retention time, indicating efficient performance.
• The developed adsorbent is biodegradable and cost-effective compared to existing non-biodegradable or commercial alternatives.

Conclusions:

• A biodegradable chitosan-based biocomposite is a highly effective and sustainable material for removing copper ions from wastewater.
• This novel adsorbent offers a promising solution for heavy metal remediation and water purification applications.
• The use of shrimp waste as a source material highlights a circular economy approach for environmental remediation.