BACKGROUND: DYES WITH UNIQUE APPLICATION IN TEXTILE, FOOD, PRINTING AND PLASTICS INDUSTRIES. MANY DYES ARE TOXIC TO SOME ORGANISMS AND MAY CAUSE DIRECTED STRUCTION OF A QUATIC COMMUNITIES. HENCE, DEVELOPING A SUSTAINABLE METHOD OF EFFLUENT MANAGEMENT FOR THE DYEING INDUSTRY IS AN IMPORTANT ISSUE FOR ENVIRONMENTAL PROTECTION. AMONG THE NUMEROUS TECHNIQUES OF DYE REMOVAL, ADSORPTION PROCESS IS ONE OF THE EFFECTIVE TECHNIQUES.METHODS: IN THE PRESENT STUDY, OXIDIZED Multiwalled carbon nanotube WAS OXIDIZED AND APPLIED FOR DYE REMOVAL. THE OPTIMIZATION OF VARIABLES WAS INVESTIGATED BY CENTRAL COMPOSITE DESIGN WILL USED FOR REMOVAL OF METHYL ORANG BY MWCNTS. OXIDIZED MWCNTS WERE CHARECTRIZED BY DIFFERENT TECHNIQUES (SEM, XPS, TEM AND FT-IR). A MATHEMATICAL MODEL WAS EXTENDED THAT SHOW SIGNIFICANT CONTRIBUTION OF SOME VARIABLES AND THEIR INTERACTION. RESULTS: A TYPICAL IMAGE OF THE MWCNTS (FIG.) SHOW RELATIVELY NARROW PARTICLE SIZE DISTRIBUTION (10-20 NM). THE EFFECTS OF VARIABLES SUCH AS PH, INITIAL DYE CONCENTRATION, ADSORBENT DOSAGE (G) AND SONICATION TIME (MIN) ON MO REMOVAL WERE STUDIED BY CCD AND THE OPTIMUM EXPERIMENTAL CONDITIONS WERE FOUND WITH RESPONSE SURFACE METHODOLOGY (RSM). THE OPTIMUM CONDITIONS WAS SET AS: 0.027 MG OF ADSORBENT, 19 MGL-1 OF MO, PH OF REMOVAL 1 AND 6 MIN OF SONICATION TIME. FITTING THE EXPERIMENTAL EQUILIBRIUM DATA TO VARIOUS ISOTHERM MODELS SHOW THE SUITABILITY AND APPLICABILITY OF THE LANGMUIR MODEL. THE KINETIC STUDY RESULT CONFIRM THAT MO ADSORPTION ON MWCNTS WAS IN A GOOD ACCORDANCE FOLLOW THE INTERPARTICLE DIFFUSION AND PSEUDO SECOND ORDER KINETIC MODEL.CONCLUSION: IN THE PRESENT STUDY, IT WAS OBSERVED THAT THE COMBINATION OF ULTRASONIC WITH MWCNTS IS A FAST AND SENSITIVE ALTERNATIVE TO ACCELERATE THE RATE OF REMOVAL OF MO. THE EQUILIBRIUM DATA WERE BEST DESCRIBED BY THE LANGMUIR MODEL AND THE PROCESS KINETICS CAN BE SUCCESSFULLY FITTED TO THE PSEUDO SECOND ORDE KINETIC MODEL.