Iranian asylum seekers say the Federal Government is putting them back into detention because it cannot force them to leave the country.

Over recent months an undisclosed number of Iranians on bridging visas have been taken from their communities and put in detention.

Australia is still negotiating with Iran to accept the return of its citizens who have not been found to be refugees.

Brisbane high school student Mojgan Shamsalipoor was put back in detention for eight months, after spending more than two years in the community and marrying an Australian resident.

"It's very upsetting and hurtful because we're just young and love each other and all our dream was to live together and make our life and be happy," she said.

Ms Shamsalipoor was moved from the Brisbane Immigration Transit Accommodation centre to detention in Darwin on Friday after speaking to the ABC.

Her husband, Milad Jafari, said he did not understand why his wife was moved when she had family support and was attending school in Brisbane.

"They were dragging her on the ground and taking her to the interview room, telling her she's going to be deported and separated from the husband and she's not going to be able to study anymore," he said.

Mr Jafari said he was not allowed to say goodbye to his wife, who he has been visiting every day since she was re-detained.

"I felt like a dead body," he said.

"Why can't I even talk to the person who I love? I just want to calm her down. I don't want her to get [panicked]."

Detention 'heartbreaking, extremely disruptive': teachers

The Immigration Department said Ms Shamsalipoor was moved to Darwin for operational reasons, not because she spoke to the ABC.

The relocation means Ms Shamsalipoor is unable to continue her Year 12 studies at Brisbane's Yeronga High School.

Teachers at the school were upset and planning to protest against the move, saying it was distressing.

"It is heartbreaking, it is extremely disruptive, [Mojgan] will be emotionally distraught right now," Yeronga High School teacher Ken Myers said.

The department said it was trying to resolve the cases of failed asylum seekers who were living in the community and expected them to leave Australia voluntarily.

It said they can be detained and removed if they don't cooperate.

Greens senator Sarah Hanson-Young said the practice was inhumane.

"The Government's objective is to make people feel so horrible, so helpless, that they'll give up and go home," she said.

"Picking people up out of the community, locking them up, moving them to remote locations such as Wickham Point, is all about forcing people to choose between the hell of Iran or the hell of detention."

There are almost 7,000 Iranians who came by boat living in the community on bridging visas, but at least 265 have had their refugee claims rejected, and some have already been sent back to detention.

If Australia reaches an agreement with Iran, Ms Shamsalipoor could be one of the first scheduled to go back there.

"I told immigration that if that stage come and they want to deport me, I will kill myself before I go to Iran," she said.

"Die in peace is better than [to] die with torture."