Patent ID: 9745212
Date: 2017-08-29
CPC Classifications: B01J,C01F,C01P,C02F,Y10T

Claim:
1. A composite material comprising surface-treated natural calcium carbonate and at least one impurity selected from a heavy metal impurity, an organic impurity, a microorganism, a polycyclic compound, cholesterol, and/or an endocrine disrupting compound, adsorbed or absorbed from water comprising the impurity, wherein the composite material is obtained by (i) contacting surface-treated natural calcium carbonate with water comprising at least one impurity selected from a heavy metal impurity, an organic impurity, a microorganism, a polycyclic compound, cholesterol, and/or an endocrine disrupting compound, so that the at least one impurity is adsorbed or absorbed by the surface-treated natural calcium carbonate, and (ii) separating the surface-treated natural calcium carbonate with the adsorbed or absorbed at least one impurity from water to obtain the composite material, wherein the surface-treated natural calcium carbonate is natural calcium carbonate from a natural source that is not saturated with heavy metals, that was treated with an acid and carbon dioxide, formed in situ or applied from an external source, in water to obtain the surface-treated natural calcium carbonate, wherein the surface-treated natural calcium carbonate has a specific surface area of from 5-200 m 2 /g as measured using nitrogen and BET method.