A visible-light-responsive molecularly imprinted polyurethane for specific detection of dibenzothiophene in gasoline?

Analytical Methods Pub Date: 2022-02-26 DOI: 10.1039/D1AY02128A

Abstract

Dibenzothiophene and its derivatives in gasoline and diesel would release sulfur oxides during combustion, and this is harmful to human health and the environment. This paper reports a method based on a visible-light-responsive molecularly imprinted polyurethane (VMIPU) to monitor trace dibenzothiophene in gasoline. The VMIPU was prepared by a polyaddition reaction using N,N-bis-(2-hydroxyethyl)-4-phenylazoaniline as the functional monomer, dibenzothiophene as the template molecule, diphenylmethane diisocyanate as the crosslinker and castor oil as the chain extender. The VMIPU showed good visible-light-response and specific adsorption for dibenzothiophene. The trans → cis photoisomerization rate constant of azobenzene chromophores in the VMIPU shows a linear relationship with the dibenzothiophene concentration in the range of 0–20 μmol L?1. This was used to estimate trace dibenzothiophene in spiked gasoline with recoveries of 95.7–101.0% and relative standard deviations of 7.0–12.7%.

Graphical abstract: A visible-light-responsive molecularly imprinted polyurethane for specific detection of dibenzothiophene in gasoline
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