Use of plant materials in the synthesis of plant nanocomposites gives rise to ecofriendly methods that desist from the addition of toxic chemicals into the environment. The present study is focused on the synthesis of silver (Ag) nanocomposites using powdered material of different medicinally important reported plants and the investigation of their water decontamination potential. Heterophragma adenophylla (Ha) capsules and Syzygium cumini (Sc) seed powders were used for the synthesis of silver nanocomposites. The synthesized nanocomposites were characterized using X ray diffraction pattern (XRD) and Fourier transform infrared spectroscopy (FT-IR). The calculated nanosizes of Ag-Sc and Ag-Ha composites were 4.6 nm and 21.81 nm respectively. FT-IR further confirms the presence of functional groups that can provide sites for the nanoparticles to bind with. Furthermore, the synthesized nanocomposites were used in the treatment of waste water by conducting batch mode adsorption study, for the removal of chromium (VI). Various parameters like time of contact, adsorbent dose and pH were optimized for the effective removal of the metal. Equilibrium modeling revealed that Langmuir adsorption model best fitted with the removal of chromium using silver based Sc-nanocomposites (q_max=8.550). Pseudo second order kinetics model (R² = 0.999 and 1.00 for Ag-Ha and Ag-Sc, respectively) explained the time dependent removal of chromium.