Biochars are commonly employed as examples of sustainable biosorbents with widely and recent interests and applications in several fields including water purification from various toxic pollutants. Biosorbents are mainly fabricated from agricultural, animal and industrial wastes. In the current investigation, bare corn cobs waste (BCCW) was pyrolyzed for 1 h (at 400 oC) to generate a sustainable, low-cost and ecofriendly nanobiosorbent (BCCW-NB) for further implementation as an effective material for removal of cationic basic fuchsin (BF) and methylene blue (MB) dyes from water. A nano-scaled (17 nm) was characterized for the as-prepared nanobiosorbent from the HR-TEM imaging analysis. The impact of several impacting factors (viz. pH, time, dosage, concentration, competing species and temperature) were explored and optimized for batch elimination of BF and MB dyes (5, 10 and 15 mg/L) from aqueous solution by BCCW-NB. The pH 5, 10 min and 30 mg BCCW-NB for both pollutants were characterized as the optimum condition to afford the maximum removal of both BF and MB dyes (R% >90.0%). The adsorption of BF and MB dyes followed the Freundlich isotherm and pseudo-second-order models. Finally, the potential of adsorptive elimination of BF and MB dyes from various water specimens by BCCW-NB nanobiosorbent confirmed excellent recovery with %R corresponding to 98.58%, 91.07% and 98.55% for MB and 93.45%, 90.13% and 97.89% for BF dye from drinking water, sea water and industrial water. Therefore, the assembled and testified BCCW-NB nanobiosorbent was confirmed as excellent low cost, sustainable and effective material for water remediation of dye pollutants.