Nano-zero valent iron impregnated cashew nut shell: a solution to heavy metal contaminated water/wastewater.

Abstract

The present research is focused on the removal of Zn(II) ions from aqueous solution using nano zero-valent iron impregnated cashew nut shell (NZVI-CNS). The present system was investigated in batch mode operation. NZVI-CNS was prepared by the liquid-phase reduction process. The results showed that the NZVI-CNS exhibited superior adsorption capacity for the removal of Zn(II) ions. Adsorption isotherm and kinetic models were applied to explain the nature of the adsorption process. Adsorption kinetic data followed the pseudo-first order kinetic model. Moreover, the equilibrium adsorption data were best fitted with a Freundlich model. Langmuir monolayer adsorption capacity was calculated as 94.46 mg of Zn(II) ions/g of NZVI-CNS. The thermodynamic parameters explain that the present adsorption system was measured as feasible and spontaneous. This newly prepared adsorbent can be successfully applied for the different industrial wastewater treatment. Finally, the exploration asks about contemplated that NZVI-CNS has exhibited unrivalled adsorption limit. Additionally, NZVI-CNS is believed to be extremely green and monetarily neighbourly help for wastewater treatment. The results indicate that the feasible approach could be applied in agricultural waste biomass materials for the productive expulsion of heavy metals from aqueous solution and reusing agricultural wastes to facilitate their disposal problem.