A chalcogel or properly metal chalcogenide aerogel is an aerogel made from chalcogens (the column of elements on the periodic table beginning with oxygen) such as sulfur and selenium, with cadmium, tellurium, platinum, and other elements. Research is ongoing, and metals less expensive than platinum have also been used in its creation. Chalcogels preferentially absorb heavy metals, showing promise in absorbing pollutants mercury, lead, and cadmium from water.
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