Biopolymers, such as Carboxyl methylcellulose (CMC) and Guar gum (GG), have attracted much attention. Herein, binary organic composite (Carboxyl methyl cellulose - Guar gum) and ternary inorganic-organic ecofriendly bionanocomposite (Copper oxide - Carboxyl methyl cellulose - Guar gum) with different wt% of CuO (1%, 3%, and 5% denoted as CMC/GG/CuO-1, CMC/GG/CuO-3, and CMC/GG/CuO-5) were prepared. The CMC, GG, CuO, CMC/GG, CMC/GG/CuO-1, CMC/GG/CuO-3, and CMC/GG/CuO-5 were characterized by XRD, FTIR, SEM, and EDX and used to remove malachite green (MG) dye from water. The effect of operational parameters on the adsorption process was investigated in detail. The maximum dye capacity was 18.5mg/g. The isotherm data showed the Freundlich isotherm, which indicated the non-uniformity of adsorption on the adsorbent surface. Pollutant removal followed the pseudo-second-order kinetics. Also, the thermodynamic study presented that adsorption was spontaneous and endothermic.