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 |
| 关键词 | Selective electrosorption Capacitive deionization Heavy metals Nitrogen-doped graphene |
| ISSN号 | 1385-8947 |
| 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 |
| 推荐引用方式 GB/T 7714 | 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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