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The incomplete understanding of the relationship between the molecular structure of flocculants and the oil removal performance and the flocculation mechanism has limited the application of flocculants in the treatment of offshore oily wastewater. To solve this problem, a series of dithiocarbamates (DTCs) characterized by different content of the functional groups (-N-CSS−) are successfully prepared in this study for the treatment of simulated oily wastewater. The oil removal efficiency is investigated by UV spectrophotometry. The FT-IR, UV-Vis, and XPS reveal the flocculation mechanism and identify the effect of the content of the -N-CSS− group on the oil removal performance and floc structures. The results show that the increase in the content of the characteristic functional group within the TPD molecule increases the size of the flocs and improves the oil removal performance. Under optimal conditions, the oil removal efficiency of TPD-C3 is 93.2%, which is higher than that of other DTCs. Besides, the resonance structure of the -N-CSS− group also has a certain influence on the oil removal performance. The presence of a positive charge on the N atoms is conducive to the enhancement of the floc’s electrostatic adsorption of the negatively charged oil droplets, which improves the oil removal performance of DTCs.

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Removal of Emulsified Oil from Oily Wastewater by Dithiocarbamates: Flocculation Performance, Mechanism and Effect of -N-CSS− Group Content

  • 会议论文

  • 发表日期：

    2025年

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  • Hongbo Wang,
  • Zihao Yang,
  • Zhaoxia Dong

摘要

The incomplete understanding of the relationship between the molecular structure of flocculants and the oil removal performance and the flocculation mechanism has limited the application of flocculants in the treatment of offshore oily wastewater. To solve this problem, a series of dithiocarbamates (DTCs) characterized by different content of the functional groups (-N-CSS−) are successfully prepared in this study for the treatment of simulated oily wastewater. The oil removal efficiency is investigated by UV spectrophotometry. The FT-IR, UV-Vis, and XPS reveal the flocculation mechanism and identify the effect of the content of the -N-CSS− group on the oil removal performance and floc structures. The results show that the increase in the content of the characteristic functional group within the TPD molecule increases the size of the flocs and improves the oil removal performance. Under optimal conditions, the oil removal efficiency of TPD-C3 is 93.2%, which is higher than that of other DTCs. Besides, the resonance structure of the -N-CSS− group also has a certain influence on the oil removal performance. The presence of a positive charge on the N atoms is conducive to the enhancement of the floc’s electrostatic adsorption of the negatively charged oil droplets, which improves the oil removal performance of DTCs.