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| Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions | |
Zhang, Ruichang1,2; Zhang, Haibo3 ; Tu, Chen3; Hu, Xuefeng3; Li, Lianzhen3; Luo, Yongming1,3; Christie, Peter1; Luo, YM (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China. [email protected]
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| 发表期刊 | JOURNAL OF NANOPARTICLE RESEARCH
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| ISSN | 1388-0764 |
| 2015-04-01 | |
| 卷号 | 17期号:4页码:165 |
| 关键词 | Titanium Dioxide Nanoparticles Facilitated Transport Humic Substances Mechanisms Aggregation Straining Transport Phenomena |
| DOI | 10.1007/s11051-015-2972-y |
| 产权排序 | [Zhang, Ruichang; Luo, Yongming; Christie, Peter] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China; [Zhang, Ruichang] Univ Chinese Acad Sci, Beijing, Peoples R China; [Zhang, Haibo; Tu, Chen; Hu, Xuefeng; Li, Lianzhen; Luo, Yongming] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China |
| 作者部门 | 中科院海岸带环境过程与生态修复重点实验室 |
| 英文摘要 | The transport behavior of titanium dioxide nanoparticles (TiO2 NPs, 30 nm in diameter) was studied in well-defined porous media composed of clean quartz sand over a range of solution chemistry under acidic conditions. Transport of TiO2 NPs was dramatically enhanced by humic substances (HS) at acidic pH (4.0, 5.0 and 6.0), even at a low HS concentration of 0.5 mg L-1. Facilitated transport of TiO2 NPs was likely attributable to the increased stability of TiO2 NPs and repulsive interaction between TiO2 NPs and quartz sands due to the adsorbed HS. The mobility of TiO2 NPs was also increased with increasing pH from 4.0 to 6.0. Although transport of TiO2 NPs was insensitive to low ionic strength, it was significantly inhibited by high concentrations of NaCl and CaCl2. In addition, calculated Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy indicated that high energy barriers were responsible for the high mobility of TiO2 NPs, while the secondary energy minimum could play an important role in the retention of TiO2 NPs at 100 mmol L-1 NaCl. Straining and gravitational settlement of larger TiO2 NPs aggregates at 1 mg L-1 HS, pH 5.0, and 2 mmol L-1 CaCl2 could be responsible for the significant retention even in the presence of high energy barriers. Moreover, more favorable interaction between approaching TiO2 NPs and TiO2 NPs that had been already deposited on the collector resulted in a ripening-shape breakthrough curve at 2 mmol L-1 CaCl2. Overall, a combination of mechanisms including DLVO-type force, straining, and physical filtration was involved in the retention of TiO2 NPs over the range of solution chemistry examined in this study.; The transport behavior of titanium dioxide nanoparticles (TiO2 NPs, 30 nm in diameter) was studied in well-defined porous media composed of clean quartz sand over a range of solution chemistry under acidic conditions. Transport of TiO2 NPs was dramatically enhanced by humic substances (HS) at acidic pH (4.0, 5.0 and 6.0), even at a low HS concentration of 0.5 mg L-1. Facilitated transport of TiO2 NPs was likely attributable to the increased stability of TiO2 NPs and repulsive interaction between TiO2 NPs and quartz sands due to the adsorbed HS. The mobility of TiO2 NPs was also increased with increasing pH from 4.0 to 6.0. Although transport of TiO2 NPs was insensitive to low ionic strength, it was significantly inhibited by high concentrations of NaCl and CaCl2. In addition, calculated Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy indicated that high energy barriers were responsible for the high mobility of TiO2 NPs, while the secondary energy minimum could play an important role in the retention of TiO2 NPs at 100 mmol L-1 NaCl. Straining and gravitational settlement of larger TiO2 NPs aggregates at 1 mg L-1 HS, pH 5.0, and 2 mmol L-1 CaCl2 could be responsible for the significant retention even in the presence of high energy barriers. Moreover, more favorable interaction between approaching TiO2 NPs and TiO2 NPs that had been already deposited on the collector resulted in a ripening-shape breakthrough curve at 2 mmol L-1 CaCl2. Overall, a combination of mechanisms including DLVO-type force, straining, and physical filtration was involved in the retention of TiO2 NPs over the range of solution chemistry examined in this study. |
| 文章类型 | Article |
| 资助机构 | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| 收录类别 | SCI |
| 语种 | 英语 |
| 关键词[WOS] | TIO2 RUTILE NANOPARTICLES ; IONIC-STRENGTH ; OXIDE NANOPARTICLES ; SOLUTION CHEMISTRY ; COLLOID DEPOSITION ; SAND COLUMNS ; FLOW-RATE ; AGGREGATION ; RETENTION ; WATER |
| 研究领域[WOS] | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| WOS记录号 | WOS:000355129700002 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/8613 |
| 专题 | 中国科学院海岸带环境过程与生态修复重点实验室 |
| 通讯作者 | Luo, YM (reprint author), Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China. [email protected] |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Ruichang,Zhang, Haibo,Tu, Chen,et al. Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions[J]. JOURNAL OF NANOPARTICLE RESEARCH,2015,17(4):165. |
| APA | Zhang, Ruichang.,Zhang, Haibo.,Tu, Chen.,Hu, Xuefeng.,Li, Lianzhen.,...&Luo, YM .(2015).Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions.JOURNAL OF NANOPARTICLE RESEARCH,17(4),165. |
| MLA | Zhang, Ruichang,et al."Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions".JOURNAL OF NANOPARTICLE RESEARCH 17.4(2015):165. |
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