The marine microorganism Planococcus sp.VITP21 from Kumta costal region of Karnataka, India was used as biosorbent for the sorption of acidic industrial dye, Black TSB (BT). The adsorbent efficiency of the dye was studied by varying the different parameters such as pH, initial dye concentration, initial salt (NaCl) concentration and initial Cr (III) concentration. The isotherm studies were performed by agitating 0.5 gm (wet weight) of biomass with 50 ml of dye solution with different concentration (10 – 40 mg/l). The parameters were analyzed using Langmuir, Freundlich and Temkin adsorption isotherms. On comparison, Freundlich was found best fitted with regression coefficient value of.99 and the maximum biosorption capacity was found to be 9.6 mg/gm. The FT-IR and SEM were also used for characterizing the biosorption process by Planococcus sp. VITP21. The results showed that marine biosorbent, Planococcus sp. VITP21 has very good potential for removing acidic dye from aqueous solution under different operating conditions. © 2014, Sphinx Knowledge House. All rights reserved.