Department of Environmental Health, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou 510515, China.
Department of Environmental Health, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou 510515, China; School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, China.
Int J Biol Macromol. 2020 Dec 15;165(Pt A):591-600. doi: 10.1016/j.ijbiomac.2020.09.156. Epub 2020 Sep 30.
A novel ethylenediaminetetraacetic acid (EDTA)-functionalized magnetic chitosan oligosaccharide and carboxymethyl cellulose (FeO@CMCCOS-EDTA) nanocomposite adsorbent was successfully fabricated for Pb(II) adsorption. The adsorbent was characterized by Fourier transform infrared, and X-ray photoelectron spectroscopy was used to confirm successful EDTA modification and Pb(II) adsorption. Scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometer, and thermogravimetric analysis were used to study the morphology and properties of magnetic particles. EDTA modification considerably improved the capacity of the adsorbent. The batch adsorption experiment results indicated that the pseudo-second-order (PSO) model and the Langmuir isotherm model reliably described the adsorption behavior. The maximum adsorption capacity (q) for monolayer chemical adsorption was calculated to be 432.34 mg/g at the pH of 5 and temperature of 308 K. Notably, FeO@CMCCOS-EDTA exhibited a high Pb(II) removal rate of ~100% using an initial metal ion solution of 100 mg/L and 200 mg/L.
一种新型的乙二胺四乙酸（EDTA）功能化磁性壳聚糖寡糖和羧甲基纤维素（FeO@CMCCOS-EDTA）纳米复合材料吸附剂被成功制备用于 Pb(II)吸附。通过傅里叶变换红外光谱对吸附剂进行了表征，并通过 X 射线光电子能谱证实了 EDTA 的成功修饰和 Pb(II)的吸附。通过扫描电子显微镜、透射电子显微镜、振动样品磁强计和热重分析研究了磁性颗粒的形态和性质。EDTA 修饰显著提高了吸附剂的容量。批量吸附实验结果表明，准二级（PSO）模型和 Langmuir 等温线模型可靠地描述了吸附行为。在 pH 值为 5 和温度为 308 K 的条件下，单层化学吸附的最大吸附容量（q）计算值为 432.34 mg/g。值得注意的是，FeO@CMCCOS-EDTA 对初始金属离子溶液浓度为 100 mg/L 和 200 mg/L 的 Pb(II)去除率高达~100%。
