http://www.gizmodo.com.au/2011/06/this-super-sand-makes-even-toxic-water-safe-to-drink/
One small point — the article refers to "graphite oxide". Last hhg2t heard, graphite is a form of the element carbon. Carbon has two oxides: carbon dioxide & carbon monoxide, both of which are gasses & unlikely to form a coating on sand particles.
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