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Influence of AEO-9 on Ultraviolet Absorbance Spectrum of TDBAC Reduced by β-CD |
XU Hui-hua, SHI Dong-po*, WU Hao, YIN Xian-qing, ZHENG Yan-cheng, CHEN Wu, LI Geng |
State Key Laboratory of Petroleum Pollution Control, Yangtze University, Jingzhou 434023, China |
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Abstract The interaction between tetradecyl dimethyl benzyl ammonium chloride (TDBAC) and fatty alcohol polyoxyethylene ether (AEO-9) could significantly interfere with the ultraviolet absorption intensity of TDBAC in an aqueous solution. The results showed that AEO-9 can improve the ultraviolet absorption intensity of TDBAC and can greatly decrease the apparent critical micelle concentration (cmc) of TDBAC. When the concentration of AEO-9 increased from 0 to 0.150 and 0.300 mmol·L-1, the apparent cmc of TDBAC decreased from 1.901 to 1.739 mmol·L-1 and 1.584 mmol·L-1, respectively. In TDBAC/AEO-9 aqueous solution, the ultraviolet absorption intensity of TDBAC was enhanced by adding 1∶1 β-cyclodextrin (β-CD) according to the molar amount of TDBAC, with the addition of 0.800 mmol·L-1 β-CD, the ultraviolet absorption intensity of TDBAC increased from 0.259 to 0.270. When the concentrations of AEO-9 increased from 0 to 0.150 or 0.300 mmol·L-1, TDBAC micelles could not be formed in the range of 0.600~2.800 mmol·L-1 in aqueous solutionby adding 1∶1 β-CD. What is more, the interference of AEO-9 on UV Spectrum of TDBAC could be greatly reduced, and the recovery rate of TDBAC in TDBAC/AEO-9 aqueous solution changed from 86.3%~107.5% to 101.9%~103.9%, which showed that the detection accuracy of TDBAC was significantly improved. The results of Job’s experiments showed that TDBAC/AEO-9 inclusion should be formed with the molar ratio of 1∶1 in an aqueous solution. The results of FTIR andTG-DSC showed that TDBAC molecules were more likely to form inclusion complexes with β-CD rather than micelles in aqueous solution, which exhibited that the interference of AEO-9 on quantitative determination of TDBAC could be significantly reduced because of the formation of TDBAC/β-CD inclusion in TDBAC/AEO-9 aqueous solutions.
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Received: 2020-11-05
Accepted: 2021-02-12
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Corresponding Authors:
SHI Dong-po
E-mail: shidongpo2006@126.com
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