SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 58 ›› Issue (6): 137-145.DOI: 10.1016/j.cjche.2022.11.003

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Efficient extraction of phenol from wastewater by ionic micro-emulsion method: Anionic and cationic

Chaobo Zhang, Xiaoyong Yang, Jian Dai, Wenxia Liu, Hang Yang, Zhishan Bai   

  1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2022-08-20 Revised:2022-11-08 Online:2023-08-31 Published:2023-06-28
  • Contact: Zhishan Bai,E-mail:baizs@ecust.edu.cn
  • Supported by:
    This research was sponsored by the National Natural Science Foundation of China (22225804), Shanghai Sailing Program, China (21YF1409500), the National Natural Science Foundation of China (22078102) and the Education and Scientific Research Projects of Shanghai, China (19DZ1208201), for which the authors express their appreciation.

Efficient extraction of phenol from wastewater by ionic micro-emulsion method: Anionic and cationic

Chaobo Zhang, Xiaoyong Yang, Jian Dai, Wenxia Liu, Hang Yang, Zhishan Bai   

  1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
  • 通讯作者: Zhishan Bai,E-mail:baizs@ecust.edu.cn
  • 基金资助:
    This research was sponsored by the National Natural Science Foundation of China (22225804), Shanghai Sailing Program, China (21YF1409500), the National Natural Science Foundation of China (22078102) and the Education and Scientific Research Projects of Shanghai, China (19DZ1208201), for which the authors express their appreciation.

Abstract: Phenolic wastewater is one of the priorities in the field of wastewater treatment, which poses a serious threat to the human health and nature environment. In this paper, cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium oleate (NaOL) microemulsions were utilized to extract phenol from the wastewater. The optimal extraction factors were investigated by exploring the effects of microemulsion composition ratio and extraction conditions on the phenol extraction performance. Furthermore, the enhanced extraction mechanism of phenol by cations microemulsions is illustrated by studying the extraction process of cationic and anionic microemulsions in the extraction of phenol. The optimum components were obtained: surfactant concentration of 0.2 mol·L-1, isoamyl alcohol volume of 30%, internal aqueous phase concentration of CTAB microemulsion of 0.05 mol·L-1, and internal aqueous phase concentration of NaOL microemulsion of 0.09 mol·L-1. The extraction efficiencies were 96.44% and 82.0% when using CTAB and NaOL microemulsions under optimal conditions (water-emulsion ratio of 5, contact time of 9 min, extraction temperature of 298.15 K, and pH of 9), confirming the enhanced extraction of phenol by CTAB cationic microemulsion. It was analyzed that the enhanced extraction of CTAB microemulsion was due to the electrostatic adsorption of cations with phenol root ions.

Key words: Phenol-containing wastewater, Phenol recovery, Microemulsion extraction, Ionic microemulsion, Mechanism analysis

摘要: Phenolic wastewater is one of the priorities in the field of wastewater treatment, which poses a serious threat to the human health and nature environment. In this paper, cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium oleate (NaOL) microemulsions were utilized to extract phenol from the wastewater. The optimal extraction factors were investigated by exploring the effects of microemulsion composition ratio and extraction conditions on the phenol extraction performance. Furthermore, the enhanced extraction mechanism of phenol by cations microemulsions is illustrated by studying the extraction process of cationic and anionic microemulsions in the extraction of phenol. The optimum components were obtained: surfactant concentration of 0.2 mol·L-1, isoamyl alcohol volume of 30%, internal aqueous phase concentration of CTAB microemulsion of 0.05 mol·L-1, and internal aqueous phase concentration of NaOL microemulsion of 0.09 mol·L-1. The extraction efficiencies were 96.44% and 82.0% when using CTAB and NaOL microemulsions under optimal conditions (water-emulsion ratio of 5, contact time of 9 min, extraction temperature of 298.15 K, and pH of 9), confirming the enhanced extraction of phenol by CTAB cationic microemulsion. It was analyzed that the enhanced extraction of CTAB microemulsion was due to the electrostatic adsorption of cations with phenol root ions.

关键词: Phenol-containing wastewater, Phenol recovery, Microemulsion extraction, Ionic microemulsion, Mechanism analysis