气凝胶
吸附
生物高聚物
水溶液
阳离子聚合
朗缪尔吸附模型
水溶液中的金属离子
化学工程
化学
自愈水凝胶
金属有机骨架
选择性吸附
材料科学
金属
无机化学
有机化学
复合材料
聚合物
工程类
作者
Hiral Ukani,Sanjay Mehra,Bhagyesh Parmar,Arvind Kumar,Anish Khan,Omar A. El Seoud,Naved I. Malek
标识
DOI:10.1021/acs.iecr.2c03804
摘要
Ameliorating the existing purification methods with more affordable, efficient, and industrially adoptable methods that remove heavy metal ions from contaminated drinking water constitutes a persistent technological challenge. Metal–organic framework (MOF)-based materials with their excellent adsorption performance are recently explored as an alternative method to the traditional methods. Here, we report a MOF/biopolymer composite-based aerogel that is a cost-effective, highly efficient, and environmentally sustainable material for the removal of large concentrations of heavy metal ions (1277 mg of Pb2+, 466 mg of Cd2+, and 706 mg of Cr6+ per gram of the aerogel) and the selective removal of the cationic dye crystal violet (310 mg/g) from its mixture with (anionic) methyl orange from contaminated water samples. The MOF used herein is 2-methylimidazole zinc complex (ZIF-8), whereas the biopolymer is the nontoxic and biodegradable Iota-Carrageenan (iCG), a sulfated polysaccharide extracted from red seaweeds. We have transformed the ZIF-8 powder into a moldable, load-bearable, flexible, and eco-friendly ZIF-8@iCG aerogel. SEM images confirmed that ZIF-8 is physically embedded in Iota-Carrageenan, forming a honeycomb structure. The ZIF-8 is located onto the fibers of iCG, forming a thermally stable, flame-retardant ZIF-8@iCG hydrogel, with high mechanical strength and intrinsic porosity. The aerogel removes 92.03% of Pb2+ ions from an intentionally spiked Pb2+ solution (1 ppm), making this water sample drinkable upon three successive filtrations. The thermodynamics of metal ion adsorption suggest that the adsorption kinetics follow the Langmuir adsorption isotherm model and the adsorption process is endothermic. Ion leaching experiments suggest that leaching of zinc ions from the aerogel is negligible. Thus, the newly designed ZIF-8@iCG aerogel is a potentially effective adsorbent for the removal of heavy metal ions and organic dyes from drinking water and is intended for industrial use.
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