A method of capturing a nitrogen-containing compound, the method comprising: a) providing a sulfonic acid-containing polymeric material having at least one -SO 2 OH group, the sulfonic acid-containing polymeric material comprising a first reaction product of a first reaction mixture comprising: i) a precursor polymeric material comprising a polymerized product of a polymerizable composition comprising a monomer of Formula wherein each R 1 is hydrogen, halo, alkyl, aryl, alkaryl, or aralkyl, wherein at least one R 1 is hydrogen; each R 2 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 3 connected to a same carbon atom to form a cyclic alkyl, or combines with a R 3 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings; each R 3 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 2 connected to a same carbon atom to form a cyclic alkyl, combines with a R 2 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings, or combines with R 4 connected to an adjacent carbon atom to form a carbon-carbon bond; and each R 4 is independently hydrogen or combines with R 3 connected to the adjacent carbon atom to form a carbon-carbon bond; and ii) a sulfonyl-containing compound; and b) sorbing a basic, nitrogen-containing compound of formula Q on the sulfonic acid-containing polymeric material to form a polymeric material having at least one group of formula -SO 3 - (QH +). a) providing a sulfonic acid-containing polymeric material having at least one -SO 2 OH group, the sulfonic acid-containing polymeric material comprising a first reaction product of a first reaction mixture comprising: i) a precursor polymeric material comprising a polymerized product of a polymerizable composition comprising a monomer of Formula wherein each R 1 is hydrogen, halo, alkyl, aryl, alkaryl, or aralkyl, wherein at least one R 1 is hydrogen; each R 2 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 3 connected to a same carbon atom to form a cyclic alkyl, or combines with a R 3 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings; each R 3 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 2 connected to a same carbon atom to form a cyclic alkyl, combines with a R 2 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings, or combines with R 4 connected to an adjacent carbon atom to form a carbon-carbon bond; and each R 4 is independently hydrogen or combines with R 3 connected to the adjacent carbon atom to form a carbon-carbon bond; and ii) a sulfonyl-containing compound; and i) a precursor polymeric material comprising a polymerized product of a polymerizable composition comprising a monomer of Formula wherein each R 1 is hydrogen, halo, alkyl, aryl, alkaryl, or aralkyl, wherein at least one R 1 is hydrogen; each R 2 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 3 connected to a same carbon atom to form a cyclic alkyl, or combines with a R 3 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings; each R 3 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 2 connected to a same carbon atom to form a cyclic alkyl, combines with a R 2 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings, or combines with R 4 connected to an adjacent carbon atom to form a carbon-carbon bond; and each R 4 is independently hydrogen or combines with R 3 connected to the adjacent carbon atom to form a carbon-carbon bond; and each R 1 is hydrogen, halo, alkyl, aryl, alkaryl, or aralkyl, wherein at least one R 1 is hydrogen; each R 2 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 3 connected to a same carbon atom to form a cyclic alkyl, or combines with a R 3 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings; each R 3 is independently hydrogen, alkyl, aryl, alkaryl, aralkyl, combines with a R 2 connected to a same carbon atom to form a cyclic alkyl, combines with a R 2 connected to the same carbon atom to form a cyclic alkyl that is fused to one or more carbocyclic rings, or combines with R 4 connected to an adjacent carbon atom to form a carbon-carbon bond; and each R 4 is independently hydrogen or combines with R 3 connected to the adjacent carbon atom to form a carbon-carbon bond; and ii) a sulfonyl-containing compound; and b) sorbing a basic, nitrogen-containing compound of formula Q on the sulfonic acid-containing polymeric material to form a polymeric material having at least one group of formula -SO 3 - (QH +).