Adsorption of hexavalent chromium ions in industrial effluent on low cost magnetized wood saw dust decayed by Isoptera (Termite): An insight into kinetics, equilibrium and thermodynamics studies

The Chromium Cr(VI) ions being the most carcinogenic hazardous metal, released directly from industries into water bodies and its adsorption in aqueous medium is challenging due to its subsequent reduction to Cr(+3) ions. Therefore, the objective of this current work is to explore the possibility of Cr(VI) ions adsorption in tannery industrial effluent by utilizing novel Isoptera decayed waste with magnetite (Fe 3 O 4 ) nanoparticles (IDW@Fe 3 O 4 nanocomposite). Simple single step, cost-effective and eco-friendly Co-precipitated method was utilized for the synthesis of biosorbent. The characteristics and variation of the synthesized nanocomposite was studied by using several analytical techniques like; SEM, FT-IR, XRD and TGA that certifying the feasibility of IDW@ Fe 3 O 4 nanocomposite towards the targeted analyte. The extreme Cr removal of 92% was attained under the optimized condition i.e. pH 4, contact time 60 min and temperature 5 − 60 °C respectively. Among the various isothermal models, the Langmiur was found to be best suited with R 2 value of 0.955 and the model of Pseudo-second order having R 2 = 0.998 for kinetic studies. While the study of thermodynamics exposed that the adsorption was endothermic in nature which was further explained by entropy, enthalpy, and changed in Free Energy. The desorption study was reasonable and excellent performance of proposed nanocomposite in real samples was extremely valuable, enormously cheap and highly effective to adsorb Cr(VI) ion.