Abstract Iron nanoparticles (KP-FeNPs) were successfully synthesized using Korla fragrant pear (Pyrus sinkiangensis Yu) peel extracts through a green synthetic method. The KP-FeNPs were characterized by TEM, SEM, XPS, XRD, and FTIR, and subsequently used to remove Cr(VI) from aqueous solutions. The KP-FeNPs were irregularly-shaped and ranged from 20 to 90 nm in size. Iron in the KP-FeNPs was mainly present as zero-valent iron (Fe0), divalent iron (Fe(II)), and trivalent iron (Fe(III)) oxides. These were coated with polyphenols, flavonoids, and other natural organic compounds from the extracts, which acted as stabilizing and capping agents. When the temperature increased and when the initial Cr(VI) concentration decreased, the removal efficiency of Cr(VI) increased. The experimental adsorption data were fit well by both a Langmuir isotherm model and a pseudo-second-order kinetic model. The maximum Cr(VI) adsorption capacity (qm) of KP-FeNPs was 46.62 mg/g at 55 °C and a pH of 5.0. The KP-FeNPs removed 99.1% of Cr(VI) within 120 min from an aqueous solution containing 10 mg/L at 55 °C and pH 5.0. This was much larger than that removed by the peel extracts (2.05%) or by Fe(II) (13.9%). The influence of five anions (NO3−, Cl−, SO42−, CO32−, and PO43−) on Cr(VI) removal and their removal effects in real water samples were also studied.

中文翻译：

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使用库尔勒香梨皮提取物绿色合成铁纳米颗粒去除水性 Cr(VI)

摘要 以库尔勒香梨（Pyrus sinkiangensis Yu）果皮提取物为原料，通过绿色合成方法成功合成了纳米铁（KP-FeNPs）。KP-FeNPs 通过 TEM、SEM、XPS、XRD 和 FTIR 进行表征，随后用于从水溶液中去除 Cr(VI)。KP-FeNPs 形状不规则，大小在 20 到 90 nm 之间。KP-FeNPs 中的铁主要以零价铁 (Fe0)、二价铁 (Fe(II)) 和三价铁 (Fe(III)) 氧化物的形式存在。这些表面涂有多酚、黄酮类化合物和提取物中的其他天然有机化合物，用作稳定剂和封端剂。当温度升高和初始 Cr(VI) 浓度降低时，Cr(VI) 的去除效率增加。Langmuir 等温线模型和准二级动力学模型均拟合了实验吸附数据。KP-FeNPs 的最大 Cr(VI) 吸附容量 (qm) 在 55 °C 和 pH 值为 5.0 时为 46.62 mg/g。KP-FeNPs 在 120 分钟内从含有 10 mg/L 的水溶液中去除了 99.1% 的 Cr(VI)，温度为 55 °C，pH 值为 5.0。这比果皮提取物 (2.05%) 或 Fe(II) (13.9%) 去除的要大得多。还研究了五种阴离子（NO3-、Cl-、SO42-、CO32- 和 PO43-）对 Cr(VI) 去除的影响及其在实际水样中的去除效果。这比果皮提取物 (2.05%) 或 Fe(II) (13.9%) 去除的要大得多。还研究了五种阴离子（NO3-、Cl-、SO42-、CO32- 和 PO43-）对 Cr(VI) 去除的影响及其在实际水样中的去除效果。这比果皮提取物 (2.05%) 或 Fe(II) (13.9%) 去除的要大得多。还研究了五种阴离子（NO3-、Cl-、SO42-、CO32- 和 PO43-）对 Cr(VI) 去除的影响及其在实际水样中的去除效果。