Removal of 6-methylquinoline from shale gas wastewater using electrochemical carbon nanotubes filter

Jinzhong Ye; Ying Wang; Xin Cheng; Guijing Chen; Di Zhang; Xin Chen; Liang Chen; Peng Tang; Wancen Xie; Baicang Liu

doi:10.1016/j.chemosphere.2024.142259

Removal of 6-methylquinoline from shale gas wastewater using electrochemical carbon nanotubes filter

Chemosphere. 2024 May 7:359:142259. doi: 10.1016/j.chemosphere.2024.142259. Online ahead of print.

Authors

Jinzhong Ye¹, Ying Wang¹, Xin Cheng¹, Guijing Chen¹, Di Zhang¹, Xin Chen¹, Liang Chen¹, Peng Tang², Wancen Xie³, Baicang Liu⁴

Affiliations

¹ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Institute for Disaster Management and Reconstruction, Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan, 610207, China; Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Section 2, Lingang Ave., Cuiping District, Yibin, Sichuan, 644000, China.
² State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Institute for Disaster Management and Reconstruction, Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan, 610207, China; Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Section 2, Lingang Ave., Cuiping District, Yibin, Sichuan, 644000, China. Electronic address: tpscu@outlook.com.
³ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Institute for Disaster Management and Reconstruction, Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan, 610207, China; Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China.
⁴ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Institute for Disaster Management and Reconstruction, Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, Sichuan, 610207, China; Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Section 2, Lingang Ave., Cuiping District, Yibin, Sichuan, 644000, China. Electronic address: bcliu@scu.edu.cn.

PMID: 38723692
DOI: 10.1016/j.chemosphere.2024.142259

Abstract

6-Methylquinoline (6-MQ) is identified as a high-concentration organic compound pervasive in shale gas wastewater (SGW) and poses a significant risk of environmental pollution. In response, this study aimed to address these challenges by introducing an innovative electrochemical membrane constructed with multi-walled carbon nanotubes (CNTs) for the removal of 6-MQ. The investigation systematically explored the impact of voltage, initial pollutant concentration, and salinity on the performance of the electrochemical CNTs filter. It was found a positive correlation between removal efficiency and increasing voltage and salinity levels. Conversely, as the initial concentration of pollutants increased, the efficiency showed a diminishing trend. The electrochemical CNTs filter exhibited remarkable efficacy in both adsorption removal and electrochemical oxidation of 6-MQ. Notably, the CNTs membrane exhibited robust adsorption capabilities, evidenced by the sustained adsorption of 6-MQ for over 33 h. Furthermore, applying an electrochemical oxidation voltage of 3 V consistently maintained a removal rate exceeding 34.0% due to both direct and indirect oxidation, underscoring the sustained efficacy of the electrochemical membranes. Besides, real wastewater experiments, while displaying a reduction in removal efficiency compared to synthetic wastewater experiments, emphasized the substantial potential of the electrochemical CNTs filter for practical applications. This study underscores the significant promise of electrochemical membranes in addressing low molecular weight contaminants in SGW, contributing valuable insights for advancing SGW treatment strategies.

Keywords: 6-Methylquinoline; Carbon nanotubes; Electrochemical membranes; Shale gas wastewater.