负载 FeO 纳米颗粒的木屑碳的绿色合成及其对水中镉（II）的去除：再生与机理。
Green synthesis of FeO nanoparticles loaded sawdust carbon for cadmium (II) removal from water: Regeneration and mechanism.
机构信息
Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology Hisar, 125001, India.
Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology Hisar, 125001, India; Department of Environmental Sciences and Technology, Central University of Punjab, Bathinda 151001, Punjab, India.
出版信息
Chemosphere. 2018 Oct;208:818-828. doi: 10.1016/j.chemosphere.2018.06.022. Epub 2018 Jun 4.
This study focused on the synthesis and characterization of novel magnetic iron oxide nanoparticles loaded sawdust carbon (FeO/SC) and EDTA modified FeO/SC (EDTA@FeO/SC) nanocomposites (ncs) by low cost biogenic green synthesis approach and their application for Cd (II) removal from aqueous medium in batch mode. In isotherm studies, Langmuir and Freundlich models are best fitted to Cd (II) removal data. Langmuir maximum adsorption capacity of EDTA@FeO/SC ncs was found to be 63.3, 22.4 and 25 mg/g that is greater than maximum adsorption capacity of FeO/SC ncs that is 51, 18.9 and 15 mg/g at the adsorbent doses of 0.4, 1.2 and 2.0 g/L, respectively. Cd (II) adsorption rate is well explained by Pseudo-second order model. Cd (II) adsorption process is spontaneous and endothermic in nature expressed by Enthalpy, Entropy and Free Energy change. The results of regeneration studies showed that EDTA modified FeO/SC ncs is promising, low cost and eco-friendly for heavy metal adsorption.
本研究采用低成本的生物绿色合成方法，合成并表征了新型磁性氧化铁纳米颗粒负载木屑碳（FeO/SC）和乙二胺四乙酸（EDTA）修饰的 FeO/SC（EDTA@FeO/SC）纳米复合材料（ncs），并将其应用于批处理模式下从水溶液中去除 Cd（II）。在等温研究中，Langmuir 和 Freundlich 模型最适合 Cd（II）去除数据。发现 EDTA@FeO/SC ncs 的最大吸附容量为 63.3、22.4 和 25 mg/g，分别大于 FeO/SC ncs 的最大吸附容量 51、18.9 和 15 mg/g，在吸附剂剂量为 0.4、1.2 和 2.0 g/L 时。准二级模型很好地解释了 Cd（II）的吸附速率。Cd（II）吸附过程是自发和吸热的，这可以通过焓、熵和自由能变化来表示。再生研究结果表明，EDTA 修饰的 FeO/SC ncs 是一种有前途的、低成本的、环保的重金属吸附剂。
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