Hydrolyzed lignin (HL) is a large-tonnage waste of the pulp and paper industry and therefore its utilization is being intensively studied. Expanded graphite (EG) is formed as a result of the rapid heating of intercalated graphite at high temperatures (800-1000°C) [1]. Due to the functional groups (HL) and high porous structure (EG), these materials are widely used in the treatment of wastewater from oil and oil products, heavy metal ions, and synthetic organic dyes. The purpose of this study is to compare the adsorption of Brilliant Green (BG) dye by two cheap adsorbents, i.e. HL and EG from model wastewater. The purpose of selecting BG dye as a model contaminant is that this dye is a cationic dye and it is known that cationic dyes are more toxic than anionic dyes [3]. BG dye causes burning in the eyes, cough, shortness of breath, skin irritation, nausea, diarrhea, and vomiting. This makes it important to treat wastewater contaminated with BG dye without discharging it directly into water bodies [2]. To compare the sorption properties of HL and EG, BG solution with a concentration of 1-50 mg/l was adsorbed with 0.03 g HL and 0.03 g EG for 24 hours in a static condition. The equilibrium concentration of BG (Ce, g/ml) was determined on a visible spectrophotometer at a wavelength of 625 nm (Thermo Scientific ™ GENESYS 30). Based on the results obtained, the sorption capacity (qe, mg/g) and removal percentage (%) were calculated using the formulas qe=((C0-Ce)·V)) m and R=((C0-Ce)/C0)·100%, respectively (where V is the volume of the dye solution (L) and m is the amount of sorbent (g)). The calculated values are presented in the Table. Table. Comparison of adsorption capacity and removal percentage of HL and EG HL C0, mg/L 1 5 15 20 25 30 35 40 45 50 qe, mg/g 0.8 3.94 11.7 15.2 16.3 17.2 18.1 18.2 18.2 18.25 R, % 80 78.8 78 76 65.2 57.3 51.7 45.5 40.4 36.5 EG C0, mg/L 1 5 15 20 25 30 35 40 45 50 qe, mg/g 0.6 2.7 7.9 10.2 12.7 13.5 14.65 14.6 14.6 14.7 R, % 60 54 52.7 51 50.8 45 41.9 36.5 32.4 29.4 As can be seen from the table, the removal percentage of both HL and EG sorbents is high at relatively low initial concentrations of the dye solution. Also, the sorption capacity and removal percentage of HL are higher than EG at all values of the initial concentrations of the dye solution. This may be because the hydroxyl (-OH) groups of HL and only the pores of EG are involved in sorption.