Abstract
An approach of manufacturing a novel cationic surfactant derived from carbon quantum dots with versatility of fluorescence, surface activity and antibacterial performance was described in detail in this work. Firstly, hydrothermal treatment was carried out on mixture of citric acid, N,N-dimethylethylenediamine and hydrogen peroxide for obtaining the carbon quantum dots (represented with OX-CQDs). Successively, quaternization of OX-CQDs with 1-chlorododecane was executed in ethanol medium for preparing the novel cationic surfactant (represented with OX-CQDs-C12H25). The measurement showed that the fluorescent quantum yield of OX-CQDs-C12H25 approached 23.13%. Surface tension of the dilute solution reached a minimum of 30.0 mN m−1, which was comparable to some cationic Gemini surfactants. Additionally, it performed synergistic surface effect when OX-CQDs-C12H25 was mixed with sodium dodecylbenzene sulfonate. Also, OX-CQDs-C12H25 still performed well in inhibiting growth of Escherichia coli when the solution was diluted to 0.21 mg mL−1. Such performances of OX-CQDs-C12H25 were superior to that of the cationic surfactant obtained by similar way without hydrogen peroxide in surface activity, fluorescent quantum yield and antibiosis for Escherichia coli.
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