Introduction

The proposed patented process involves the synthesis of innovative calcium oxide and iron hydrate nanoparticles of very small size using ion exchange resins.

Technical features

As is known to the industry, there are no other processes to produce calcium oxide and iron nanoparticles, and typical nanoparticle synthesis procedures have limitations, such as long synthesis times, low production yield, poor process scalability at industrial level, use of organic substances, and the need for stages to remove reaction by-products.

In this context, a team of researchers at the University of L’Aquila developed a process for the production of calcium oxide and iron hydride nanoparticles, which overcomes the limitations of current methods. The process takes place at room temperature, is characterised by a high yield (> 95%), an extraordinary reduction in production time (< 60min) and simple industrial scalability (TRL 4), since there is no formation of reaction by-products. The synthesised compound, Ca4Fe2O7-13H2O, occurs in the form of hexagonal lamellae (10nm thick) and can carbonate to form iron-coated nano-carbonates in amorphous form.

Possible Applications

• In the consolidation of carbonate substrates of historical interest (frescoes, mortars, etc.), thanks to the possibility of penetrating into the substrate;
• As a non-toxic carbonation indicator in the manufacture of mortars;
• As a nano-adsorbent for the removal of contaminants in water;
• For obtaining iron-coated nano-carbonate for use as a filler in thermoplastic polymers.

Advantages

• Considerable reduction in production time;
• Savings on raw materials and energy;
• Simple, scalable process that saves time and costs;
• Quality, innovation of the end product and increased surface reactivity.