Kütahya Dumlupınar University, Faculty of Arts and Sciences, Department of Chemistry, Kütahya, 43100, Turkey.
Anal Methods. 2022 Sep 15;14(35):3382-3396. doi: 10.1039/d2ay00691j.
Lead is one of the most hazardous toxic heavy metal ions in industrial wastewater. The removal of Pb(II) from aqueous environment is an extremely essential topic due to acquiring clean water resources and its significant impact on human health. Adsorption is an effective and the most widely used method for heavy metal removal from an aqueous medium. Nanofibers have potential advantages in the adsorption of heavy metal ions from wastewater. In this study, nanofibers based on polyvinyl alcohol (PVA) were fabricated for the removal of lead ions from aqueous samples. Nanofibers produced by electrospinning were characterized by scanning electron microscopy (SEM/EDX) and Fourier transform infrared (FT-IR) techniques. A batch system was used for the adsorption of Pb(II) ions onto cross-linked PVA (%10) and PVA (%10):MSs (%2) ( L. seed biomaterial) nanofibers. The effectiveness of cross-linking was determined by the water absorbency test. The pH, adsorbent amount, adsorption kinetics, isotherms, and thermodynamic values were thoroughly investigated in the adsorption tests. Pb(II) adsorption on the polymer was confirmed by EDX analysis. The optimum values found were a pH of 6, an adsorbent dose of 5.0 mg, and a contact time of 120 min. Lead ion concentrations were determined by flame atomic absorption spectrometry (FAAS). The Freundlich models could explain the results from the adsorption data. Similar results were obtained from adsorption isotherm models, and the results were found to support each other. The adsorption capacity for PVA (10%) and PVA (10%):MSs (2%) nanofibers were found to be 444.2 mg g and 588.2 mg g, respectively. The adsorption capacity increases with the addition of MSs (2%) biomaterial. As a result, nanofibers can be used as effective adsorbents in the removal of Pb(II) ions. The developed methods are environmentally friendly and promising for the separation of toxic Pb(II) ions from aqueous systems, which is a major problem for environmental pollution.
铅是工业废水中最危险的有毒重金属离子之一。由于获取清洁水资源及其对人类健康的重大影响，从水环境中去除 Pb(II) 是一个极其重要的课题。吸附是从水介质中去除重金属的一种有效且最广泛使用的方法。纳米纤维在从废水中吸附重金属离子方面具有潜在的优势。在这项研究中，制备了基于聚乙烯醇 (PVA) 的纳米纤维，用于从水样中去除铅离子。通过扫描电子显微镜 (SEM/EDX) 和傅里叶变换红外 (FT-IR) 技术对电纺纳米纤维进行了表征。使用批处理系统将交联的 PVA (%10) 和 PVA (%10):MSs (%2)（L. 种子生物材料）纳米纤维用于吸附 Pb(II) 离子。通过吸水测试确定交联的有效性。在吸附测试中，深入研究了 pH、吸附剂用量、吸附动力学、等温线和热力学值。通过 EDX 分析证实了聚合物上的 Pb(II) 吸附。发现最佳值为 pH 值 6、吸附剂用量 5.0 mg 和接触时间 120 min。通过火焰原子吸收光谱法 (FAAS) 测定铅离子浓度。Freundlich 模型可以解释吸附数据的结果。吸附等温线模型得到了类似的结果，结果相互支持。发现 PVA(10%) 和 PVA(10%):MSs(2%)纳米纤维的吸附容量分别为 444.2 和 588.2 mg/g。随着 MSs(2%)生物材料的添加，吸附容量增加。因此，纳米纤维可用作去除 Pb(II) 离子的有效吸附剂。开发的方法对从水系统中分离有毒 Pb(II) 离子是环保且有前途的，这是环境污染的一个主要问题。
