摘要
随着经济的不断发展,重金属污染给生态系统带来了严重的环境风险。因此,制备绿色环保且高效的重金属吸附新材料已成为当前研究领域中备受关注的热点。本研究以明胶(Gel)和羧甲基壳聚糖(CMCS)为载体,通过简单的掺杂法引入ZIF-8,制备一种具有三维多孔结构的明胶-羧甲基壳聚糖-ZIF-8复合气凝胶(GCZ-4),采用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)对复合气凝胶的形貌和结构进行了表征,并将其用于水中Pb^(2+)的吸附。结果表明:该复合气凝胶对Pb^(2+)表现出优异的吸附能力,由Langmuir吸附等温模型计算得到的复合气凝胶对Pb^(2+)的最大理论吸附量达367.42 mg·g^(−1),吸附过程为自发放热过程,并且遵从准二级动力学模型,属于化学吸附。此外,经过5次吸附-脱附试验,复合气凝胶仍对Pb^(2+)保持较高的吸附性能。总的来说,GCZ-4复合气凝胶能够有效去除水中的Pb^(2+),是一种环保、经济、可回收的吸附剂。
With the continuous development of the economy,heavy metal pollution has posed serious environmental risks to ecosystems.Consequently,developing efficient and environmentally friendly new adsorption materials for heavy metal has become a current research focus.In this work,a gelatin-carboxymethyl chitosan-ZIF-8 composite aerogel(GCZ-4)with a three-dimensional porous structure was prepared by incorporating ZIF-8 through a simple doping method using gelatin(Gel)and carboxymethyl chitosan(CMCS)as carriers.The morphology and structure of the GCZ-4 were characterized using scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).Furthermore,a series of adsorption experiments were carried out to optimize the various parameters affecting Pb^(2+)adsorption behaviors.The results demonstrate that the composite aerogel exhibits excellent adsorption capacity for Pb^(2+).According to the Langmuir adsorption isothermal model,the maximum theoretical adsorption capacity of the composite aerogel for Pb^(2+)is 367.42 mg·g^(−1).The whole adsorption process was a spontaneous exothermic process and followed the pseudo-second-order kinetic model,indicating chemisorption behavior.Moreover,even after five cycles of adsorption-desorption tests,the composite aerogel maintains high performance in removing Pb^(2+).Overall,the GCZ-4 composite aerogel is an eco-friendly,cost-efficient,and recyclable adsorbent that effectively removes Pb^(2+)from water.
作者
许优燕
付义乐
王自娜
李鑫
王梓懿
关丽
XU Youyan;FU Yile;WANG Zina;LI Xin;WANG Ziyi;GUAN Li(School of Chemistry and Chemical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《复合材料学报》
北大核心
2025年第7期3804-3816,共13页
Acta Materiae Compositae Sinica
基金
陕西省自然科学基础研究计划项目(2024JC-YBQN-0125
2022JM-096)。
