The present study attempted to analyze the biosorption behavior of novel biosorbent, Araucaria heterophylla(green plant) biomass, to remove Cd+2from solutions against various parameters, i.e., initial metal ion concentration, pH, temperature, sorbent dosage and biomass particle size. The maximum biosorption was found to be 90.02% at pH 5.5 and biosorption capacity (qe) of Cd+2is 9.2506 mg g−1. The Langmuir and Freundlich equilibrium adsorption isotherms were studied and it was observed that Freundlich model is the best fit than the Langmuir model with correlation co-efficient of 0.999. Kinetic studies indicated that the biosorption process of Cd+2well followed the pseudo-second-order model with R20.999. Thermodynamic studies observed that the process is exothermic (ΔH°negative). Free energy change (ΔG°) with negative sign reflected the feasibility and spontaneous nature of the process. The chemical functional –OH groups, CH2stretching vibrations, C=O carbonyl group of alcohol, C=O carbonyl group of amide, P=O stretching vibrations and –CH groups were involved in the biosorption process. The XRD pattern of the A. heterophyllawas found to be mostly amorphous in nature. The SEM studies showed Cd+2biosorption on selective grains of the biosorbent. It was concluded that A. heterophyllaleaf powder can be used as an effective, low-cost, and environmentally friendly biosorbent for the removal of Cd+2from aqueous solution.