中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Development of nitrogen-doped carbon for selective metal ion capture

文献类型:期刊论文

作者Ji, Qinghua; Hu, Chengzhi; Liu, Huijuan; Qu, Jiuhui
刊名CHEMICAL ENGINEERING JOURNAL
出版日期2018-10-15
卷号350页码:608-615
ISSN号1385-8947
关键词Selective electrosorption Capacitive deionization Heavy metals Nitrogen-doped graphene
文献子类Article
英文摘要Nitrogen-doped carbons are promising materials for applications in capacitive deionization, electrosorption and aqueous ion separation, as nitrogen atoms doped into a carbon matrix are active for the selective capture of metal ions. However, much remains unknown about the preferential interaction behavior between metal ions and nitrogen-containing active sites, which retards the development of high-performance capacitive materials for practical applications. Here, we developed two types of nitrogen-doped carbon: pyridinic N-dominated graphene (N-6-G) and pyrrolic N-dominated graphene (N-5-G). The pyridinic-N was found to prefer binding "hard" ions (H+ and Na+), while pyrrolic-N showed enhanced performance in capturing "soft" ions (Pb2+). Compared to pristine reduced graphene oxide, the specific capacitance of N-6-G in Na2SO4 electrolyte increased by 50.0% (239.7 F g(-1)), while an increase of only 22.1% was found for N-5-G (195.2 F g(-1)), which demonstrate the superior capture capacity of pyridinic N toward Na+. However, for the electrosorption of Pb2+ ion, the maximum adsorption capacity per surface area of N-5-G was 2.43 mg m(-2), which is 3.3 times as high as N-6-G (0.73 mg m(-2)). Furthermore, the distribution coefficient (Kd) value of N-5-G is similar to 50 times higher than N-6-G. It is proposed that soft-soft and hard-hard interactions exist between nitrogen-containing groups and metal ions. These findings set a new benchmark for the capture of aqueous metal ions and suggest the great potential of N-doped carbon for challenging toxic metal pollution issues.
源URL[http://ir.rcees.ac.cn/handle/311016/40804]  
专题生态环境研究中心_大气污染控制中心
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Ji, Qinghua,Hu, Chengzhi,Liu, Huijuan,et al. Development of nitrogen-doped carbon for selective metal ion capture[J]. CHEMICAL ENGINEERING JOURNAL,2018,350:608-615.
APA Ji, Qinghua,Hu, Chengzhi,Liu, Huijuan,&Qu, Jiuhui.(2018).Development of nitrogen-doped carbon for selective metal ion capture.CHEMICAL ENGINEERING JOURNAL,350,608-615.
MLA Ji, Qinghua,et al."Development of nitrogen-doped carbon for selective metal ion capture".CHEMICAL ENGINEERING JOURNAL 350(2018):608-615.

入库方式: OAI收割

来源:生态环境研究中心

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