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. ymluo@yic.ac.cn
发表期刊JOURNAL OF NANOPARTICLE RESEARCH
ISSN1388-0764
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
DOI10.1007/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
被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
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. ymluo@yic.ac.cn
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
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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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