Enhancing photocatalytic performance by direct photo-excited electron transfer from organic pollutants to low-polymerized graphitic carbon nitride with more C-NH/NH2 exposure
文献类型：期刊论文
| 作者 | Li, Fan; Li, Tong; Zhang, Lili ; Jin, Yang; Hu, Chun
|
| 刊名 | APPLIED CATALYSIS B-ENVIRONMENTAL
 |
| 出版日期 | 2021-11-05 |
| 卷号 | 291页码:- |
| 关键词 | Nitrogen-functionalized biochar Cr(VI) removal Protonation energy Protonation site prediction Adsorption energy |
| ISSN号 | 0269-7491 |
| 英文摘要 | In this study, N-functionalized biochars with varied structural characteristics were designed by loading poplar leaf with different amounts of urea at 1:1 and 1:3 ratios through pyrolysis method. The addition of urea significantly increased the N content of biochar and facilitated the formation of amine (-NH-, -NH2), imine (-HC=NH), benzimidazole (-C7H5N2), imidazole (-C3H3N2), and pyrimidine (-C4H3N2) groups due to substitution reaction and Maillard reaction. The effect of pH on Cr(VI) removal suggested that decrease in solution pH favored the formation of electrostatic attraction between the protonated functional groups and HCrO4-. And, experimental and density functional theory study were used to probe adsorption behaviors and adsorption mechanism which N-functionalized biochars interacted with Cr(VI). The protonation energy calculations indicated that N atoms in newly formed N-containing groups were better proton acceptors. Adsorption kinetics and isotherm experiments exhibited that N-functionalized biochars had greater removal rate and removal capacity for Cr(VI). The removal rate of Cr(VI) on N-functionalized biochar was 10.5-15.5 times that of untreated biochar. Meanwhile, N-functionalized biochar of NB3 with the largest number of adsorption sites for-C7H5N2,-NH2,-OH,-C3H3N2, and phthalic acid (-C8H5O4) exhibited the supreme adsorption capacity for Cr(VI) through H bonds and the highest adsorption energy was -5.01 kcal/mol. These mechanistic findings on the protonation and adsorption capacity are useful for better understanding the functions of N-functionalized biochars, thereby providing a guide for their use in various environmental applications. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/46911]  |
| 专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
| 作者单位 | 1.Guangzhou Univ, Inst Environm Res Greater Bay, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Fan,Li, Tong,Zhang, Lili,et al. Enhancing photocatalytic performance by direct photo-excited electron transfer from organic pollutants to low-polymerized graphitic carbon nitride with more C-NH/NH2 exposure[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2021,291:-. |
| APA | Li, Fan,Li, Tong,Zhang, Lili,Jin, Yang,&Hu, Chun.(2021).Enhancing photocatalytic performance by direct photo-excited electron transfer from organic pollutants to low-polymerized graphitic carbon nitride with more C-NH/NH2 exposure.APPLIED CATALYSIS B-ENVIRONMENTAL,291,-. |
| MLA | Li, Fan,et al."Enhancing photocatalytic performance by direct photo-excited electron transfer from organic pollutants to low-polymerized graphitic carbon nitride with more C-NH/NH2 exposure".APPLIED CATALYSIS B-ENVIRONMENTAL 291(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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