In this research, the potential of ion flotation to remove hexavalent chromium from dilute aqueous solution with a rhamnolipid biosurfactant was investigated. The operating parameters, such as initial solution pH, the rhamnolipid to heavy metal ratio (C/M), and the ionic strength (NaCl), have a marked influence on the performance of ion flotation, as shown in this investigation. Results showed that the percentage of ion removal increased with increasing the rhamnolipid to heavy metal ratio...