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Chromium(VI) contamination of drinking water arises from industrial activity wherever there is a lack of environmental legislation enforcement regarding the removal of such pollutants. Whilst it is possible to remove such harmful metal ions from drinking water through large scale facilities, there currently exists no safe and simple way to filter chromium(VI) oxoanions at point-of-use (which is potentially safer and necessary in remote locations or humanitarian scenarios). High surface area cloth substrates have been functionalized with calixarene molecules for the selective capture of aqueous chromium(VI) oxoanions in the presence of structurally similar anions. This is accomplished by pulsed plasmachemical deposition of a linker layer and subsequent functionalization with dimethylaminomethyl-calixarene (5,11,17,23tetrakis[(dimethylamino)methyl]-25,26,27,28-tetrahydroxycalix[4]arene, DMAMcalixarene). Chromium(VI) oxoanions are captured by simply passing polluted water through the functionalised cloth, whilst other ions not harmful / beneficial to human health remain in the water. These cloth filters are simple to use, highly selective, and easily recyclable-thus making them attractive for point-of-use application in geographic regions lacking appropriate wastewater treatment plants or flawed environmental monitoring systems. Chromium(VI) pollutants have been successfully removed from real-world contaminated industrial wastewater streams using the dimethylaminomethyl-calixarene functionalised cloths.

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