The massive consumption of espresso merchandise inevitably leads to an enormous quantity of espresso by-products. These by-products reminiscent of spent espresso floor (SCG), espresso husk, and occasional pulp are normally thought of waste and sometimes discarded. Nonetheless, it has now been valorized as a precursor for low–price activated carbon. This paper highlights the activation methods and the adsorption efficiency of espresso waste activated carbons. A number of activation methods, which embrace bodily and chemical strategies, have been utilized by many students to synthesize activated carbon. Earlier research additionally display the applicability and promising potential of espresso waste activated carbons for natural and inorganic pollution removing from aqueous options.