MoS2-encapsulated nitrogen-doped carbon bowls for highly efficient and selective removal of copper ions from wastewater

• Published in: Separation and purification technology Vol. 304; p. 122284
• Main Authors: Wu, Tao, Chen, Xingwen, Zhang, Hongguo, Zhao, Meng, Huang, Lei, Yan, Jia, Su, Minhua, Liu, Xianjie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2023
• Subjects: Bowl type carbon material; Capacitive deionization; Copper-containing wastewater; Synergy; Targeted removal; Capacitive deionization; Bowl type carbon material; Synergy; Copper-containing wastewater; Targeted removal; Copper -containing wastewater
• ISSN: 1383-5866; 1873-3794; 1873-3794
• DOI: 10.1016/j.seppur.2022.122284

•Synergistic electrosorption of HBC bilayers and MoS2 for Cu2+ complexation.•HBC shows excellent structural stability before and after MoS2 loading.•High selective ion removal effect is still achieved in the presence of complex ions.•Used as an electrode in capacitive deionization technology.
Capacitive deionization has been considered as a promising wastewater treatment technology because of its low-cost and highly efficient. Herein, we prepared hollow bowl-type carbon materials loaded with molybdenum sulfide (HBC-MoS2) composites and fabricated it as an innovative electrode material to remove Cu2+ in a multi-ion coexistence system. With the synergistic effect of electric double layer (EDL) and complexation between MoS2 and Cu2+, the HBC-MoS2-0.02 electrode achieved effective removal of copper ions from low concentration wastewater (25 mg/L) and high electrosorption capacity of 28.97 mg g−1 at 1.0 V. Even in the presence of competing ions (Na+/Zn2+/Cu2+), the HBC-MoS2-0.02 electrode still can effectively remove Cu2+ with a final adsorption capacity of 28 mg g−1, showing its superiority. The mechanism of Cu2+ removal by HBC-MoS2 is mainly due to the synergistic effect of EDL and complexation.