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Effective detection of Ag+, Hg2+ and dye adsorption properties studies of Ln-MOFs based on a benzimidazole carboxylic acid ligand
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-03-28 , DOI: 10.1039/d3dt00579h
Qing-Wei Cao 1 , Tian-Cai Yue 1 , Qing-Wei Dong 1 , Qi-Chao Ma 1 , Ze-Bei Xie 1 , Duo-Zhi Wang 1 , Lu-Lu Wang 1
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-03-28 , DOI: 10.1039/d3dt00579h
Qing-Wei Cao 1 , Tian-Cai Yue 1 , Qing-Wei Dong 1 , Qi-Chao Ma 1 , Ze-Bei Xie 1 , Duo-Zhi Wang 1 , Lu-Lu Wang 1
Affiliation
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Five new lanthanide metal–organic frameworks (Ln-MOFs), namely {[Ln(L)]·Cl}n, [Ln = Pr(1), Nd(2), Eu(3), Ho(4), Ce(5)], based on a benzimidazole carboxylic acid ligand [H2L = 2-(2-carboxyphenyl)-1H-benzo[d]imidazole-6-carboxylic acid] were synthesized by a solvothermal method. Ln-MOFs 1–5 have the same two-dimensional layered structures. Interestingly, 1–5 exhibit excellent adsorption performance to anionic 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 5 can be considered a promising multifunctional fluorescent sensor with good reusability and a high sensitivity toward Ag+ and Hg2+ ions, with detection limits of 1.7 × 10−7 and 2.5 × 10−6 M, respectively.
中文翻译：
基于苯并咪唑羧酸配体的 Ln-MOFs 的 Ag+、Hg2+ 有效检测和染料吸附性能研究
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 Ag +和 Hg 2+离子的高灵敏度，检测限分别为 1.7 × 10 -7和 2.5 × 10 -6 M。
更新日期：2023-03-28
中文翻译：
基于苯并咪唑羧酸配体的 Ln-MOFs 的 Ag+、Hg2+ 有效检测和染料吸附性能研究
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 Ag +和 Hg 2+离子的高灵敏度，检测限分别为 1.7 × 10 -7和 2.5 × 10 -6 M。
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