Introduction

It is proposed to patent a new type of filter for the removal of hexavalent chromium Cr(VI) in aqueous matrices, based on the combination of fully biodegradable materials obtainable from the treatment of food waste (fruit and vegetables) and / or expired drugs. The entire procedure for preparing the filter material is obtained through processes with low environmental impact. In particular, the phases of solid / liquid extraction of organic acids from vegetable matrices (fruit and vegetable wastes) were performed through a procedure that does not use organic solvents.

Technical features

In the domestic environment the techniques for removing Cr (VI) are mainly based on the use of reverse osmosis or filters containing cationic resins. There are also filter cartridges that contain blends of activated carbon, copper and zinc known as KDF (Kinetic Degradation Fluxion). In this case, several heavy metals, including Cr (VI), are removed using redox reactions. The present invention offers an innovative approach based on principles of ecosustainability and circular economy. Waste products from the agri-food industry, particularly from the fruit and vegetable sector, can be converted to generate low- cost filters for domestic users, characterized by high Cr (VI) abatement efficiency, low environmental impact and excellent recycling potential.

Possible Applications

• Removal from aqueous solutions of heavy metals harmful to health;
• Removal of hexavalent chromium (Cr (VI)) from mains water.

Advantages

• Easy preparation methodology;
• Easy to use for heavy metal removal;
• Low cost;
• Recovery of food waste;
• Recovery of expired drugs.