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Direct Observation of Adsorption Kinetics on Clays by Cation−π Interaction−Triggered Aggregation Luminescence

Abstract

A clear understanding of adsorption kinetics is a long-standing challenge because the fluorescence of aggregation luminescent-labelled adsorbates is inevitably quenched, which is difficult to observe directly. Herein, we designed and synthesized a cationic adsorbate, E-4-formyl-styryl-pyridinium salt (FSPH), with a strong fluorescent emission in the aggregation state by replacing weaker π−π interaction with stronger cation−π interaction. Interestingly, the complete adsorption kinetics of FSPH on clays was visualized by virtue of in situ fluorescence imaging technique. The subsequent fluorescence intensity quantification revealed that the adsorption kinetics of FPSH on clays could be divided into three stages: molecular aggregation at the edge, formation of block layer, and molecular invasion from edge to center. The discovery of formation of block layer not only identifies a previously unknown source of the lower adsorption capacity with larger particle size of clays, but also lights the great passion of scientists to study the adsorption kinetics on other adsorbents by employing cation−π interaction−triggered aggregation luminescence.

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Publication details

The article was received on 25 Sep 2018, accepted on 06 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC04837A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Direct Observation of Adsorption Kinetics on Clays by Cation−π Interaction−Triggered Aggregation Luminescence

    J. Zhong, X. Cui, W. Guan and C. Lu, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC04837A

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