Highly efficient capacitive removal of Cd2+ over MoS2-Carbon framework composite material in desulphurisation wastewater from coal-fired power plants

Cadmium (Cd2+) is the main toxic heavy metal in desulphurisation wastewater for coal-fired power plants. Here, a novel carbon skeleton/molybdenum disulphide composite material (MoS2/AC) with expanded layer spacing was synthetized in one step for Cd2+ removal through the capacitive deionization metho...

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Published in:Journal of cleaner production 2022-06, Vol.355, p.131814, Article 131814
Main Authors: Yin, Taozhu, Zhang, Yongsheng, Dong, Duo, Wang, Tao, Wang, Jiawei
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Language:English
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Activated carbon
Capacitive deionization
Cd2+ removal
MoS2
Wastewater
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cited_by cdi_FETCH-LOGICAL-c239t-4d2058100f24c4ce31125b190b5233537c509032dd64d84ef3d530e1ca3cd7753
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creator Yin, Taozhu
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description Cadmium (Cd2+) is the main toxic heavy metal in desulphurisation wastewater for coal-fired power plants. Here, a novel carbon skeleton/molybdenum disulphide composite material (MoS2/AC) with expanded layer spacing was synthetized in one step for Cd2+ removal through the capacitive deionization method. As the results showed, the Cd2+ removal capacity of the MoS2/AC cell was 22.15 mg g−1, and the concentration of Cd2+ in the simulated wastewater was effectively reduced from 10 ppm to
doi_str_mv 10.1016/j.jclepro.2022.131814
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Here, a novel carbon skeleton/molybdenum disulphide composite material (MoS2/AC) with expanded layer spacing was synthetized in one step for Cd2+ removal through the capacitive deionization method. As the results showed, the Cd2+ removal capacity of the MoS2/AC cell was 22.15 mg g−1, and the concentration of Cd2+ in the simulated wastewater was effectively reduced from 10 ppm to &lt;0.1 ppm. According to the characterisation, the layer spacing of MoS2 nanosheets in MoS2/AC increased by 58.06% compared with the original commercial MoS2, which could provide more active sites for Cd2+ adsorption. Moreover, the XPS results showed that electrosorption and complexation on the surface of MoS2/AC were the main routes for Cd2+ removal, especially the complexation between Cd2+ and metal-sulphur. In addition, the selective adsorption efficiency of MoS2/AC was more than 98% under the coexistence of other ions, such as Na+, Mg2+, and Ca2+. The regenerated MoS2/AC also had a high adsorption capacity for Cd2+ even after 5 cycles. The MoS2/AC material also exhibited excellent removal capability for heavy metal ions in the actual desulphurisation wastewater from coal-fired power plants (&lt;1 ppb). The results indicated that MoS2/AC may be a prospective material for heavy metal ion removal from wastewater. [Display omitted] •MoS2/AC was developed as an effective CDI electrode material.•High Cd2+ absorption capacity of 22.15 mg g−1 and excellent recyclability.•The obtained MoS2/AC possess enlarged interlayer spacing to expose S adsorption sites.•The exposed sulphur atoms complexed with cadmium ions to remove Cd2+.</description><identifier>ISSN: 0959-6526</identifier><identifier>EISSN: 1879-1786</identifier><identifier>DOI: 10.1016/j.jclepro.2022.131814</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Activated carbon ; Capacitive deionization ; Cd2+ removal ; MoS2 ; Wastewater</subject><ispartof>Journal of cleaner production, 2022-06, Vol.355, p.131814, Article 131814</ispartof><rights>2022</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c239t-4d2058100f24c4ce31125b190b5233537c509032dd64d84ef3d530e1ca3cd7753</citedby><cites>FETCH-LOGICAL-c239t-4d2058100f24c4ce31125b190b5233537c509032dd64d84ef3d530e1ca3cd7753</cites><orcidid>0000-0002-1104-5605 ; 0000-0002-4792-592X ; 0000-0002-3836-9802</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Yin, Taozhu</creatorcontrib><creatorcontrib>Zhang, Yongsheng</creatorcontrib><creatorcontrib>Dong, Duo</creatorcontrib><creatorcontrib>Wang, Tao</creatorcontrib><creatorcontrib>Wang, Jiawei</creatorcontrib><title>Highly efficient capacitive removal of Cd2+ over MoS2-Carbon framework composite material in desulphurisation wastewater from coal-fired power plants</title><title>Journal of cleaner production</title><description>Cadmium (Cd2+) is the main toxic heavy metal in desulphurisation wastewater for coal-fired power plants. 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The regenerated MoS2/AC also had a high adsorption capacity for Cd2+ even after 5 cycles. The MoS2/AC material also exhibited excellent removal capability for heavy metal ions in the actual desulphurisation wastewater from coal-fired power plants (&lt;1 ppb). The results indicated that MoS2/AC may be a prospective material for heavy metal ion removal from wastewater. 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Here, a novel carbon skeleton/molybdenum disulphide composite material (MoS2/AC) with expanded layer spacing was synthetized in one step for Cd2+ removal through the capacitive deionization method. As the results showed, the Cd2+ removal capacity of the MoS2/AC cell was 22.15 mg g−1, and the concentration of Cd2+ in the simulated wastewater was effectively reduced from 10 ppm to &lt;0.1 ppm. According to the characterisation, the layer spacing of MoS2 nanosheets in MoS2/AC increased by 58.06% compared with the original commercial MoS2, which could provide more active sites for Cd2+ adsorption. Moreover, the XPS results showed that electrosorption and complexation on the surface of MoS2/AC were the main routes for Cd2+ removal, especially the complexation between Cd2+ and metal-sulphur. In addition, the selective adsorption efficiency of MoS2/AC was more than 98% under the coexistence of other ions, such as Na+, Mg2+, and Ca2+. The regenerated MoS2/AC also had a high adsorption capacity for Cd2+ even after 5 cycles. The MoS2/AC material also exhibited excellent removal capability for heavy metal ions in the actual desulphurisation wastewater from coal-fired power plants (&lt;1 ppb). The results indicated that MoS2/AC may be a prospective material for heavy metal ion removal from wastewater. [Display omitted] •MoS2/AC was developed as an effective CDI electrode material.•High Cd2+ absorption capacity of 22.15 mg g−1 and excellent recyclability.•The obtained MoS2/AC possess enlarged interlayer spacing to expose S adsorption sites.•The exposed sulphur atoms complexed with cadmium ions to remove Cd2+.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jclepro.2022.131814</doi><orcidid>https://orcid.org/0000-0002-1104-5605</orcidid><orcidid>https://orcid.org/0000-0002-4792-592X</orcidid><orcidid>https://orcid.org/0000-0002-3836-9802</orcidid></addata></record>
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subjects Activated carbon
Capacitive deionization
Cd2+ removal
MoS2
Wastewater
title Highly efficient capacitive removal of Cd2+ over MoS2-Carbon framework composite material in desulphurisation wastewater from coal-fired power plants
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