An extensive study on the use of different materials as green adsorbents for eliminating environmental pollutants from wastewaters is provided in this chapter. This chapter focuses on two topics i.e. synthesis of activated carbon from cost effective agricultural sources, which are environment friendly and use of agricultural wastes/residues, by-products, natural sources etc. for the production of green adsorbents. This classification helps study the synthesis of green adsorbents in detail.
Keywords: Agricultural wastes, agro-based activated carbon, fly ash, food residues, fruits, industrial wastes, municipal wastes, peels, preparation routes, vegetables.