Wastewater containing heavy metals (HMs) beyond permissible limit has to be decontaminated by appropriate treatment method. Numerous conventional methods have been applied for heavy metal decontamination including chemical precipitation, ion-exchange, electrolysis and membrane applications etc. The most of conventional methods are less efficient for decontamination of metals due to the resistance and persistence of HMs in wastewater. Even so, the conventional methods have their own limitations; adsorption using low-cost hybrid bioadsorbents has been explored as environmental friendly method for the removal of metal ions from wastewater. This review has been summarized the sources and effects of different heavy metals in the water/wastewater. The possible treatment methods also highlighted with their owned advantages and limitations. The factors affecting the biosorption process such as bioadsorbent dosage, solution pH, contact time, initial concentration, temperature and ionic potentials attracting to metal ions has been evaluated by the published researches. Moreover, the possible mechanisms of metal biosorptions were discussed in the light of previous studies. This review has been finds that the removal of heavy metals utilizing hybrid bioadsorbents are outstanding materials due to their exciting physic-chemical properties and other characteristics include eco-friendly nature, low cost, nontoxic, high adsorption capacity and reusability. This review could be considered as a precious pathway for exploring more low-cost, environmental friendly hybrid adsorbents for metal decontamination from wastewater, eventually the review will contribute to environmental remediation and purification applications of biomaterials.