Microscopic mechanism about the selective adsorption of Cr(VI) from salt solution on O-rich and N-rich biochars
文献类型：期刊论文
| 作者 | Zhao, Nan; Zhao, Chuanfang; Tsang, Daniel C. W.; Liu, Kunyuan; Zhu, Ling; Zhang, Weihua; Zhang, Jing ; Tang, Yetao; Qiu, Rongliang
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| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
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| 出版日期 | 2021-02-15 |
| 卷号 | 404页码:- |
| 关键词 | Selective removal Engineered biochars Nitrogen/oxygen functionality Complexation modelling Hydrogen bond |
| ISSN号 | 0304-3894 |
| 英文摘要 | The adsorption of Cr(VI) on biochars can be suppressed by coexisting anions, but the roles of O-containing functional groups and in particular N-containing functional groups are unclear. In this study, we combined spectroscopic and molecular simulation approaches to investigate the selective adsorption of Cr(VI) on the O-rich (PB, UB1) and N-rich (UB3, UB5) biochars under strong competition of anions. The elemental analysis and pyrolysis-gas chromatography/mass spectrometry indicated that the structures of PB and UB1 were similar, and so were the UB3 and UB5. Quantification of functional groups showed that for UB1, 75.3% of Cr(VI) removal was attributed to O-containing groups, while 53.3-72.7% of that was mediated by N-containing groups in UB3 and UB5. X-ray photoelectron spectra and density functional theory calculations confirmed that for O-rich biochars, surface complexation and strong H-bonds between carboxyl/hydroxyl and HCrO4- improved Cr(VI) removal in the presence of anions, while for N-rich biochars, Cr(VI) adsorption was depressed by coexisting anions in the order of Cl->NO3- >SO42- because of the weaker H-bond between protonated amino groups and HCrO4-. This study presents a novel approach for quantitative, molecular-level evaluation of the roles of biochar functional groups in the Cr(VI) removal from complex environmental systems. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45782]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China 2.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China 3.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Guangdong, Peoples R China 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Nan,Zhao, Chuanfang,Tsang, Daniel C. W.,et al. Microscopic mechanism about the selective adsorption of Cr(VI) from salt solution on O-rich and N-rich biochars[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,404:-. |
| APA | Zhao, Nan.,Zhao, Chuanfang.,Tsang, Daniel C. W..,Liu, Kunyuan.,Zhu, Ling.,...&Qiu, Rongliang.(2021).Microscopic mechanism about the selective adsorption of Cr(VI) from salt solution on O-rich and N-rich biochars.JOURNAL OF HAZARDOUS MATERIALS,404,-. |
| MLA | Zhao, Nan,et al."Microscopic mechanism about the selective adsorption of Cr(VI) from salt solution on O-rich and N-rich biochars".JOURNAL OF HAZARDOUS MATERIALS 404(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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