Effective detection of Ag+, Hg2+ and dye adsorption properties studies of Ln-MOFs based on benzimidazole carboxylic acid ligand
作者:Qing-Wei Cao、Tian-Cai Yue、Qing-Wei Dong、Qi-Chao Ma、Ze-Bei Xie、Duo-Zhi Wang、Lu-Lu Wang
DOI:10.1039/d3dt00579h
日期:——
dye Congo red (CR), with adsorption capacities of 2724 mg g−1, 2719 mg g−1, 2718 mg g−1, 327 mg g−1, and 2273 mg g−1, respectively. Adsorption kinetics experiments showed that this kind of adsorption belonged to chemisorption; the hydrogen bonding and π–π interactions between the 1–5 host and CR guest molecules resulted in a high adsorption capacity. Luminescence and sensing experiments showed that
五种新的镧系金属有机框架 (Ln-MOFs),即 [Ln( L )]·Cl} n , [Ln = Pr( 1 ), Nd( 2 ), Eu( 3 ), Ho( 4 ), Ce ( 5 )],基于苯并咪唑羧酸配体[H 2 L = 2-(2-carboxyphenyl)-1 H -benzo[d]imidazole-6-carboxylic acid],采用溶剂热法合成。Ln-MOFs 1-5具有相同的二维层状结构。有趣的是,1-5对阴离子染料刚果红(CR)表现出优异的吸附性能,吸附容量分别为2724 mg g -1、2719 mg g -1、2718 mg g-1、327 mg g -1和 2273 mg g -1。吸附动力学实验表明,这种吸附属于化学吸附;1-5个主体和CR客体分子之间的氢键和π-π相互作用导致高吸附能力。发光和传感实验表明, 5可被认为是一种很有前途的多功能荧光传感器,具有良好的可重用性和对