Methods of removing carbon dioxide comprising contacting a gas mixture comprising carbon dioxide with a sorbent. The sorbent comprises the following chemical structure: ##STR00001## wherein at least one of R.sub.1, R.sub.2, and R.sub.3 comprises a primary amine group and wherein the sorbent is not melamine and does not comprise the following chemical structure: ##STR00002## Sorbents for removing carbon dioxide are also disclosed.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with government support under Contract Number DE-AC07-051D14517 awarded by the United States Department of Energy. The government has certain rights in the invention.