John Tomlin was heldon suspicion of grievous bodily harm with intent over the incident in Beckton, east London, on June 21.
The manhanded himself in at a police station on Sunday and is being held in custody, the Scotland Yard said.
Resham Khan and Jameel Muhktar, 37, reportedly of Pakistani-origin, were attacked by a man throwing acid through their car window on Khan's 21st birthday.
Both suffered horrific face and neck injuries in the attack that took place on Tollgate Road.
Mukhtar has said he feels "emotionally wrecked" and "in continuous pain".
Scotland Yard said enquiries into the incident were continuing.
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