Chen Menghua, Yu Mengdie, Kang Runfeng, Sun Huimin, Zhang Wang, Wang Shengsen, Wang Nong, Wang Jun
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Yangling, 712100, PR China.
Chemosphere. 2022 Jun;297:134084. doi: 10.1016/j.chemosphere.2022.134084. Epub 2022 Feb 24.
In this paper, new adsorbents with high mechanical strength chitosan-graphene oxide (CS-GO) and chitosan-titanium dioxide (CS-TiO) were synthesized by using glutaraldehyde as crosslinking agent, and the adsorption behavior of Pb (II) and V (V) on them were investigated. The materials were characterized by scanning electron microscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The effects of initial metal ion concentration and contact time on the removal of V (V) and Pb (II) by CS-GO and CS-TiO were investigated. Characterization results showed that the hydroxyl group of GO/TiO reacted with the amino group of chitosan. A comparison of the kinetic models against experimental data showed that the kinetics react system was best described by the pseudo-second-order model. indicating that chemical adsorption was the main adsorption force. the Langmuir adsorption model and Freundlich model agreed well with the experimental data. The removal capacity of Pb (II) by CS-GO and CS-TiO were lower than those of V (V). The uncross-linked -OH and CO were the main adsorptive sites for Pb (II) removal, while uncross-linked -OH and -NH played an important role in removing V (V). These findings provided insights on the removing lead and vanadium pollution.
本文以戊二醛为交联剂合成了具有高机械强度的新型吸附剂壳聚糖-氧化石墨烯（CS-GO）和壳聚糖-二氧化钛（CS-TiO），并研究了它们对Pb（II）和V（V）的吸附行为。通过扫描电子显微镜（SEM-EDS）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对材料进行了表征。研究了初始金属离子浓度和接触时间对CS-GO和CS-TiO去除V（V）和Pb（II）的影响。表征结果表明，GO/TiO的羟基与壳聚糖的氨基发生了反应。将动力学模型与实验数据进行比较，结果表明，该动力学反应体系最好用准二级模型来描述，这表明化学吸附是主要的吸附力。Langmuir吸附模型和Freundlich模型与实验数据吻合良好。CS-GO和CS-TiO对Pb（II）的去除能力低于对V（V）的去除能力。未交联的-OH和CO是去除Pb（II）的主要吸附位点，而未交联的-OH和-NH在去除V（V）中起重要作用。这些发现为去除铅和钒污染提供了思路。
