The entry of heavy metals due to industrial activities into the environment is one of the major problems in this century. Nickel and chromium(VI) are the toxin elements that are used in various industries. In this study, lignocellulose nanofiber was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of nickel and chromium(VI) ions from aqueous solutions in a batch system. The effects of pH, initial concentration, adsorbent dose, contact time, and temperature were investigated. The adsorption mechanism was determined by Langmuir, Freundlich, kinetic, and thermodynamic models. Investigation of equilibrium isotherms nickel and chromium(VI) showed that the isotherm fitted well with the Freundlich model. The pseudo-second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters of both nickel and chromium such as Gibbs free energy, enthalpy, and entropy were calculated which indicated spontaneous, endothermic, and random processes, respectively. Lignocellulose nanofiber can be suggested as a good adsorbent that is highly capable of adsorbing nickel and chromium(VI) from aqueous solutions.
Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minute contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions.
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