β-Cyclodextrin/L-phenylalanine carbon quantum dots@ Carboxymethyl cellulose composite membrane for efficient...

With the increasing release gas of volatile organic compounds (VOCs) in chemical and pharmaceutical industry, it not only has become prominent in environmental pollution, but also will cause the fire hazard due to the inflammable property. Common methods for VOCs detection have the characteristics of complex detection procedures, long detection cycles, and professional operation. Therefore, it is necessary to develop a low-cost and on-site visual detection method. In this study, green β-Cyclodextrin/L-phenylalanine carbon quantum dots@carboxymethyl cellulose composited membrane (β-Cyclodextrin/L-Phe CQDs@CMC composited membrane) were prepared and characterized. The average size of CQDs was 5.97 nm, and quantum yield was 16.92 %. The composited membrane was used for selective and sensitive detection of the inflammable cyclohexane. The results showed that cyclohexane could quench the fluorescence of β-Cyclodextrin/L-Phe CQDs@CMC composite membrane obviously. When the concentration of cyclohexane gas was 100-900 mg·m^-3, the concentration was inversely proportional to the fluorescence intensity of the composite membrane, and the limit of detection was 1.079 mg·m^-3. Besides, it had high selectivity over other organic interferences. The fluorescence spectrometry method of CQDs has efficient-promising future for inflammable gas detection.