In this study, pumice from different regions of Turkey (Diyarbakir, Southeast Turkey and Bitlis, East Turkey) has been supplied and used as supporting material for nanoscale zero-valent iron (nFe⁰). Native Bitlis pumice (NBP)-supported nanoscale zero-valent iron (BP-nFe⁰) and native Diyarbakir pumice (NDP)-supported nanoscale zero-value iron (DP-nFe⁰) were synthesized under the same conditions. Native pumice (NDP, NBP) and pumice-supported nFe⁰ (DP-nFe⁰ and BP-nFe⁰) adsorbents were morphologically and structurally characterized by SEM, EDX, XRF and BET. When using NBP as support material, the iron content of the BP-nFe⁰ increased 1.9-fold from 1.99 to 3.83%. However, iron content of NDP (2.08%) increased approximately 29 times after it is used as a support material in synthesis of DP-nFe⁰ (60%). The removal potential of native pumice (NBP and NDP) and iron-modified pumice (BP-nFe⁰ and DP-nFe⁰) samples was investigated to remove Cr(VI) ions. The parameters of solution pH, initial metal concentration, contact time and the amount of adsorbent in the removal of chromium (VI) ions were investigated. Langmuir, Freundlich, Temkin, Dubinin–Radushkevich and Jovanovic isotherm models were used to evaluate the adsorption equilibrium data. The equilibrium adsorption was found so as to be well described by the Langmuir isotherm model for all the adsorbents studied. The maximum adsorption capacity of Cr(VI) ions for NDP, NBP, DP-nFe⁰ and BP-nFe⁰ was 10.82, 14.30, 161.29 and 17.39 mg/g, respectively. The rate of Cr(VI) removal was subjected to kinetic analysis using pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elovich models. Kinetic studies suggest that adsorption of NDP, NBP, DP-nFe⁰ and BP-nFe⁰ described more favorably by the pseudo-second-order kinetic model. The results showed that NDP is a much better support material for nFe⁰ when compared to NBP.

在这项研究中，来自土耳其不同地区（迪亚巴克尔，土耳其东南部和比特利斯，土耳其东部）的浮石已被提供并用作纳米级零价铁 (nFe ⁰ ) 的支持材料。在相同条件下合成了原生 Bitlis 浮石 (NBP) 支撑的纳米级零价铁 (BP-nFe ⁰ ) 和原生迪亚巴克尔浮石 (NDP)支撑的纳米级零价铁 (DP-nFe ⁰ )。通过SEM、EDX、XRF和BET对天然浮石（NDP、NBP）和浮石负载的nFe ⁰（DP-nFe ⁰和BP-nFe ⁰）吸附剂进行形态和结构表征。当使用 NBP 作为载体材料时，BP-nFe ⁰的铁含量从 1.99% 增加到 3.83%，增长了 1.9 倍。然而，在用作合成 DP-nFe ⁰ (60%)的载体材料后，NDP (2.08%) 的铁含量增加了约 29 倍。天然浮石（NBP 和 NDP）和铁改性浮石（BP-nFe ⁰和 DP-nFe ⁰）的去除潜力) 样品进行了研究以去除 Cr(VI) 离子。研究了溶液 pH 值、初始金属浓度、接触时间和吸附剂在去除铬 (VI) 离子中的用量等参数。Langmuir、Freundlich、Temkin、Dubinin-Radushkevich 和 Jovanovic 等温线模型用于评估吸附平衡数据。平衡吸附被发现，以便通过朗缪尔等温线模型对所有研究的吸附剂进行很好的描述。Cr(VI) 离子对 NDP、NBP、DP-nFe ⁰和 BP-nFe ⁰的最大吸附容量分别为 10.82、14.30、161.29 和 17.39 毫克/克。使用准一级、准二级、粒子内扩散和 Elovich 模型对 Cr(VI) 去除率进行动力学分析。动力学研究表明，NDP、NBP、DP-nFe ⁰和BP-nFe ⁰的吸附更容易被伪二级动力学模型描述。结果表明，与 NBP 相比，NDP 是一种更好的 nFe ⁰支撑材料。