R. Butt, R. Nazir, M.N. Khan, A. Hamid
spent tea waste, iron nanoparticles, nickel, chromium, electroplating
Waste water from electroplating industry is heavily loaded with the heavy metals and is a potential threat to environment and human health. In this study the potentiality of spent tea waste charcoal has been determined as low cost adsorbent for the removal of heavy metals (nickel and chromium) from the waste water with a twofold objective of management of solid waste for effective treatment of effluent. The iron nanoparticle doped tea waste charcoal (Fe-TWC) was synthesized and characterized using FT-IR, powder XRD, SEM/EDX. The synthesized Fe-TWC was found quite effective in removing 98% Nickel and 95% Chromium from the simulated samples. The study also investigates the effects of process parameters such as stirring time, temperature, initial pH, initial metal ion concentration and adsorbent dose. The adsorption data follows Langmuir adsorption better than Freundlich model while following pseudo-second order kinetic model. Various thermodynamic parameters (ΔG°, ΔH° and ΔS°) have also been assessed. The effectiveness of adsorbent was also checked and verified on actual industrial samples. This study indicated that Fe-TWC can be used as an effective, low cost and environment friendly adsorbent for the treatment of electroplating waste effluent.