Natural mineral filtration system for selective removal of targeted organics from coconut water

Overview

This research proposes a natural mineral-based filtration system for the selective removal of targeted organic compounds from coconut water. The approach uses water-insoluble, non-toxic mineral crystals to physically and chemically absorb specific organics through hydrogen bonding, host-guest chemistry, and metal-ligand interactions. By screening combinatorial combinations of mineral families, the system can be tailored to target specific organic contaminants, offering a safe and natural alternative for coconut water processing.

Technical specifications

Core mechanisms:

• Mineral crystals such as metal oxides, layered double hydroxides, and spinels form surface hydrogen bonds with oxygen-containing organics including alcohols, aldehydes, carboxylates, and lactones
• Benzothiazoles chemically bind to copper-containing minerals through metal-ligand bonds with Cu(I) or Cu(II) cations
• Carboxylates form metal-ligand bonds with metal cations on mineral surfaces
• Nanocrystals provide significantly higher absorption capacity than microcrystals due to increased surface area
• Layered double hydroxides can trap anions via intercalation

Filtration process:

• Mineral crystals in powder form are packed into a fine-fritz sintered glass funnel
• Coconut water passes through the porous glass layer via suction filtration
• Pre- and post-filtration organic content evaluated using 400 MHz NMR spectrometer and gas chromatography
• Metal leaching assessed by inductively coupled plasma atomic emission spectroscopy

Technology readiness level

This research is at an early-to-mid stage of development. The scientific basis is established through prior published work on surface organic ligands binding to metal nanoparticles and spinel cobalt oxide nanoparticles. Literature precedent supports the chemical absorption capabilities of rutile TiO2 minerals and layered double hydroxides for organic adsorption. Future validation will involve combinatorial screening of non-toxic natural mineral families containing various metal cations, followed by filtration testing with coconut water and comprehensive characterization of removal efficiency and metal leaching safety.