Reference number 7012

Sectors: Chemicals

Industries: Chemicals

A new filter to remove Arsenic in drinking water


The ImpAs sorbent is composed of a di-zinc complex immobilised onto an ImpAs resin. This novel material has a high adsorbing capacity which makes it unique for application in point-of-use and point-of-entry water treatment systems to remove arsenic from contaminated water.


Arsenic in drinking water threatens the health of people in over 70 countries. It is estimated that 170 million people are exposed to unsafe levels of arsenic in drinking water above the WHO guideline of 10 ppb.

Methods for arsenic remediation in wide use today are based on adsorption of arsenic on iron oxides. However, iron oxides suffer from fast saturation and poor selectivity, which means they are unsuitable for groundwaters with high concentration of competing anions and leading to the need of large amounts of sorbent. This makes it impractical to apply iron oxides in point of use devices.


ImpAs is a new sorbent material which overcomes these challenges. The sorbent comprises a di-zinc complex immobilised onto an ImpAs resin (solid support) that removes arsenate and has greater regeneration capacity compared to existing sorbents.


  • High adsorption capacity for arsenate (i.e. arsenic (V)) from drinking water
  • Efficient arsenate remediation at a wide range of pH values (pH 5 to 10)
  • High selectivity to arsenate against common competing anions such as bicarbonate and sulphate
  • High regenerative capacity
  • Ideal resin for point-of-use and point-of-entry water treatment systems due to small amount of sorbent needed.

Intellectual property

ImpAs and methods of use for removing arsenic from aqueous solutions are protected by European and US patents: EP3154675 and US10479703B2



A portrait of Professor Dominik Weiss
Professor Dominik Weiss

Professor of Environmental Geochemistry
Faculty of Engineering, Department of Earth Science & Engineering

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A portrait of Professor Ramon Vilar
Professor Ramon Vilar

Professor of Medicinal Inorganic Chemistry
Faculty of Natural Sciences, Department of Chemistry

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Contact us about this technology


Luis Gomez Sarosi

Industry Partnerships and Commercialisation Officer, Natural Sciences

Dr Luis Gomez Sarosi is Industry Partnerships and Commercialisation Officer for the Faculty of Natural Sciences at Imperial College London.

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