**6. Agricultural waste-based adsorbents (e.g., coconut shell, rice husk, sugarcane bagasse)**

Agricultural wastes are one of the expected possibilities for alternative absorption. There are many review articles on the elimination of hazardous chemicals using biomass resources. In **Figure 3**, various types of agricultural waste-based adsorbents are listed for absorbing water contaminants from industrial effluent [23]. Orange peel, coniferous Pinus bark powder, wheat husk, activated palm ash, cattail root, neem sawdust, peanut husk, Jujuba seeds, and coir pith activated carbon are among the agricultural wastes. To remove dye from industrial effluent, activated carbon can also be made from a variety of other agricultural wastes, including coconut tree sawdust, banana pith, silk cotton hull, maize cob, and sago waste [24].
