A novel polymer was synthesized through the condensation of 2, 4-dihydroxybenzoic acid with acrylamide and formaldehyde. The polymer was comprehensively characterized by elemental analysis, physico-chemical methods, and spectrometry such as Ultraviolet Visible spectroscopy, Infrared spectroscopy and Proton Nuclear Magnetic Resonance. Semi-crystalline nature of polymer was exported using electron Beam microscopy. GPC (gel permeation chromatography) was implemented to figure out the molecular weight of the polymer. To assess its metal adsorption capabilities, a batch separation performance was used for the selective extraction of toxic traces metallic cation such as Co²⁺, Cd²⁺, and Pb²⁺. Experimental outcomes indicated that the synthesized polymer possesses a highly permeable and major surface area, contributing to its enhanced metal ion uptake. When differentiate with marketable available phenolic and polystyrene resins, the polymer demonstrated superior adsorption performance. By employing thermogravimetric analysis (TGA), the polymer's thermal stability has been assessed. Detailed thermal decomposition behavior was studied, and kinetic parameters were evaluated using both the Freeman–Carroll and Sharp–Wentworth methods. The consistency between the results from both methods confirmed the reliability of the thermal analysis.