Effect of structural differences of pumice on synthesis of pumice-supported nFe0: removal of Cr (VI) from water

Abstract In this study, pumice from different regions of Turkey (Diyarbakir, Southeast and Bitlis, East Turkey) has been supplied used as supporting material for nanoscale zero-valent iron (nFe 0 ). Native Bitlis (NBP)-supported (BP-nFe ) native Diyarbakir (NDP)-supported zero-value (DP-nFe were synthesized under the same conditions. (NDP, NBP) pumice-supported nFe BP-nFe adsorbents morphologically structurally characterized by SEM, EDX, XRF BET. When using NBP support material, content increased 1.9-fold 1.99 to 3.83%. However, NDP (2.08%) approximately 29 times after it is a in synthesis DP-nFe (60%). The removal potential (NBP NDP) iron-modified samples was investigated remove Cr(VI) ions. parameters solution pH, initial metal concentration, contact time amount adsorbent chromium (VI) ions investigated. Langmuir, Freundlich, Temkin, Dubinin–Radushkevich Jovanovic isotherm models evaluate adsorption equilibrium data. found so be well described Langmuir model all studied. maximum capacity NDP, NBP, 10.82, 14.30, 161.29 17.39 mg/g, respectively. rate subjected kinetic analysis pseudo-first-order, pseudo-second-order, intraparticle diffusion Elovich models. Kinetic studies suggest that more favorably pseudo-second-order model. results showed much better when compared NBP.