Fluorescence Quenching Investigation of Methyl Red Adsorption on Aluminum-Based Metal-Organic Frameworks

Langmuir : the ACS Journal of Surfaces and Colloids
Jun-Kai ChenSzetsen Lee

Abstract

The adsorption of methyl red (MR) isomers (ortho, meta, and para) on metal-organic frameworks (MOFs) was investigated by using a fluorescence quenching technique. All three MR isomers were found to quench the fluorescence of MOFs effectively. Nonlinear fluorescence quenching trends were observed in Stern-Volmer plots. A modified nonlinear Stern-Volmer equation with the concepts of multiple adsorption sites, adsorption strength, and quencher accessibility was successfully adopted to fit the fluorescence quenching data. The fitted parameters were correlated with the structural properties of MRs and MOFs. The order of quenching efficiency was found to be m-MR > p-MR > o-MR for all MOFs. This indicates that MR molecules not only adsorb via carboxylate-metal bonding but also adsorb through π-π interactions between the aromatic rings of MR and linker molecules in MOFs. The position of the carboxylate group in MRs and the structure of the linkers in MOFs are the key factors affecting the fluorescence quenching efficiency.

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Citations

Aug 31, 2018·Angewandte Chemie·Yaroslav S KocherginMichael J Bojdys
Nov 15, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Aniruddha DasShyam Biswas
Feb 16, 2021·Journal of Molecular Graphics & Modelling·Mahmood Reza DehghanMehrdad Niakousari
Mar 16, 2021·Advanced Science·Anjaiah Nalaparaju, Jianwen Jiang
May 15, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Xudong ZhaoZhixian Gao
Jun 13, 2021·Journal of Colloid and Interface Science·Hamid RazaNazir Ahmad
May 19, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Manas MahapatraNayan Ranjan Singha
Dec 2, 2020·Inorganic Chemistry·Pedro LeoFernando Martínez
Aug 3, 2019·ACS Applied Materials & Interfaces·Qian LiuCerasela Zoica Dinu
Jun 4, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Geoffrey HollettMichael J Sailor

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