(6) The potential of low-cost adsorbents under multi-component pollutants needs to be assessed. This would make a significant impact on the potential commercial application of low-cost adsorbents to industrial systems.
(7) There is scarce data available for the competitive adsorption of pollutants (metal ions adsorption in presence of phenols, dyes and other contaminants and vice-versa). Therefore, more research should be conducted in this direction.
(8) It is further suggested that the research should not limit to only lab scale batch studies, but pilot-plant studies should also be conducted utilizing low-cost adsorbents to check their feasibility on commercial scale.