The present paper is focused on the synthesis and optimization of a green PVA-co-poly(MAA) adsorbent by free radical polymerization using N,N '-methylene-bis-acrylamide and potassium persulphate as a cross-linker-initiator system. The surface morphology and structural properties were studied by the techniques such as FTIR, FESEM and XRD. The synthesized adsorbent was found to possess the maximum adsorption capacity of 0.761 mg g(-1) at the equilibrium of methylene blue dye from an aqueous solution at 10 ppm concentration, 500 mg of sample dose, at a pH of 7 and at a temperature of 30 degrees C. The kinetic study confirmed that the dye adsorption followed the pseudo-second-order model and was found to fit well with the Langmuir isotherm model. The adsorbent of PVA and methacrylic acid (MAA) also exhibits brilliant regeneration efficiency for the four successive adsorption-desorption cycles. The synthesized semi-IPN hydrogel was found to be a cost-effective and renewable propitious candidate with excellent regeneration efficiency to be used as a green adsorbent for the removal of methylene blue from the wastewater effluents. [GRAPHICS] .