I divorced my wife with three [declarations], and I was in a state of ritual impurity (janabah). So, does the divorce take effect?

Being in a state of major ritual impurity (janabah (definition)) does not prevent a divorce from occurring. The juristic opinion (fatwa (definition)) is that pronouncing divorce three times counts as three separate divorces, and a divorce pronounced during a period of purity (tuhr) in which intercourse has taken place is effective, contrary to the view of some scholars. Based on this, if you divorced your wife three times, willingly and with full awareness, she is irrevocably divorced from you (baynunah kubra). She does not become lawful for you again unless she marries another man out of genuine desire, not for the purpose of making her lawful for you (tahlil), and he consummates the marriage, then divorces her or dies, and her waiting period (iddah (definition)) expires.