Nanomaterial Applications in Water Remediation

Advances in nanomaterials have transformed approaches to water purification by exploiting unique properties at the nanoscale. Metal-based particles, especially zero-valent iron and bimetallic alloys, offer high reactivity for reductive dechlorination of organic pollutants. Metal oxides and carbon-based composites leverage large surface areas and tailored porosities to remove dyes, pharmaceuticals and persistent chlorinated compounds through adsorption and catalytic degradation. Support matrices such as clays, biochars and carbon nanotubes prevent nanoparticle agglomeration and extend service life. Ongoing research seeks to optimise synthesis methods, improve stability under variable pH and redox conditions, and scale up processes for industrial and community water treatment. The global significance of these materials lies in their potential for low-cost, high-efficiency removal of priority contaminants and for integration into decentralised treatment systems.

Research from Nature Portfolio

A novel dry in-situ hydrogen reduction method has been applied to montmorillonite to fabricate immobilised Fe/Ni bimetallic nanoparticles with uniform dispersion and minimal oxidation during synthesis. By tuning nickel content to around 28.5% and employing an 800 °C reduction temperature, the composite achieved over 90% degradation of 4-chlorophenol within one hour. The clay support maintains nanoparticle activity and allows easy recovery, offering a scalable route to produce highly reactive catalysts for chlorinated organic pollutants without requiring liquid-phase synthesis environments.

Nanomaterial Applications in Water Remediation publication trend

The graph below shows the total number of articles in nanomaterial applications in water remediation across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoscale zero-valent iron (nZVI): Iron particles below 100 nm exhibiting high surface energy that drive reductive degradation of organic pollutants.

Bimetallic nanoparticles: Nanoscale particles composed of two distinct metals, harnessing synergistic catalytic or redox properties for contaminant removal.

Adsorption: The accumulation of dissolved species at the surface of a solid material, facilitating concentration and subsequent degradation.

Dechlorination: The chemical removal of chlorine atoms from organic compounds, often yielding less toxic or more biodegradable products.

Biochar: A carbon-rich solid derived from pyrolysed biomass, providing high surface area and functional groups for pollutant adsorption and nanoparticle support.

References

1. Montmorillonite immobilized Fe/Ni bimetallic prepared by dry in-situ hydrogen reduction for the degradation of 4-Chlorophenlo. Scientific Reports (2019).
2. Performance, Reaction Pathway and Kinetics of the Enhanced Dechlorination Degradation of 2,4-Dichlorophenol by Fe/Ni Nanoparticles Supported on Attapulgite Disaggregated by a Ball Milling–Freezing Process. Materials (2022).
3. Removal of Trichloroethylene from Water by Bimetallic Ni/Fe Nanoparticles. Water (2022).
4. Development of Vitamin B6-Mediated Biochar with Nano Zero-Valent Iron Coating for Oxytetracycline Removal through Adsorption and Degradation under Harsh Acidic Conditions. Water (2022).