Adsorption of ammonia on graphite oxide/Al13 composites

Graphite oxide/Al13 composites were prepared using graphite oxide and commercial solution of Chlorhydrol®. Although surfactant was used to disperse of graphene-like layers, they were restacked together upon addition of Al13 Keggin polycations. The crust of inorganic phase was deposited on the outer surface of GO platelets. The resulting materials were used as adsorbents of ammonia in dry or wet conditions either in an as received form or prehumidified for 2 h before the breakthrough test. It was shown that water in the system decreases the amount adsorbed, likely as a result of the competition with ammonia for adsorption centers. The highest and strongest adsorption was found in the dry conditions where interlayer space was partially available and the acidic centers of an inorganic phase played an enhancing role in the retention of ammonia.