Collocations for circulate - verb

freely
Air can circulate freely through the tunnels.

around, round (esp. BrE)
The heart circulates blood around the body.

in
sugar circulating in the bloodstream

through
Blood circulates through the arteries and veins.

widely
The book was circulated widely in Russia.

freely

among
newspapers circulating among minority communities

around, round (esp. BrE)
There's a story circulating around the office that you are about to leave.

to
The document will be circulated to all members.

Circulate is used with these nouns as the subject:
air, blood, coin, copy, gossip, rumour, story

Circulate is used with these nouns as the object:
agenda, copy, document, information, memo, minute, pamphlet, petition