The negative effects of heavy metal discharge caused by various industries on the environment and living organisms have been well-proven. Conventional technologies for removing heavy metals from aqueous solutions are not economically viable and in addition to being ineffective at low concentrations of metal ions, they produce a large amount of chemical sludge. The biological absorption of nickel by non-living and inactive microbial biomass or derived from plants is an alternative and innovative technology to remove this pollution from aqueous solutions while eliminating the problems of the conventional methods mentioned in this article due to the availability of adsorbents It has renewable and high absorption capacity. The present study was a review study to introduce types of microbial and plant-derived bio absorbents to remove nickel from aqueous solution and reveal the absorption capacity of each adsorbent. It suggests the use of these biomasses as bio-adsorbents for the removal of nickel in aqueous solution as a promising and environmentally friendly perspective. According to the studies, in most processes of nickel biological absorption with different adsorbents, a negative value, and a positive value have been reported. It has a negative value due to the spontaneity of the process and a positive value due to the increase of random collisions between solid and solution during the process.
