其他题名Mechanisms of mobility and retention of nano-TiO_2 in acidic porous media in the presence of humus acids
张瑞昌; 章海波
; 涂晨; 骆永明发表期刊中国环境科学
ISSN1000-6923
2018-09-20
卷号38期号:09页码:3542-3551
关键词纳米TiO2titanium dioxide nanoparticlesfulvic acid富里酸humic acidstability胡敏酸transport稳定性迁移性
产权排序(1)河南科技大学化工与制药学院; (2)中国科学院南京土壤研究所中国科学院土壤环境与污染修复重点实验室; (3)中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室
作者部门海岸带环境过程实验室
英文摘要The mechanisms of mobility and retention of titanium dioxide nanoparticles (nTiO_2) in well-defined porous media composed of clean quartz sand in the presence of fulvic acid (FA) and humic acid (HA) were studied under acidic conditions.nTiO_2 were immobile in the porous media in the absence of FA and HA at pH 4.0.FA and HA could be adsorbed onto the surface of nTiO_2,change the electrokinetic properties of nTiO_2,and facilitate the transport of nTiO_2.The elution of nTiO_2 increased from 0.01 and 0.88 to 0.91 and 0.94 with the increase of FA and HA from 1mg/L to 10mg/L respectively.Compared to FA,more HA was adsorbed onto nTiO_2,and thus the facilitated effect of HA on transport of nTiO_2 was stronger.Ions inhibited the mobility of nTiO_2,and the effect of CaCl_2 was greater than that of NaCl in same concentration.The mobility of nTiO_2 was better in the presence of HA than FA.In addition,7%~56% nTiO_2 was deposited in the secondary energy minimum well in the presence of HA,higher than 4%~17% in the presence of FA,which could be easily released when the environmental conditions changed.High energy barriers between nTiO_2 and quartz promoted the mobility of nTiO_2,while a combination of the secondary minimum energy,straining,diffusion and gravitational deposition were involved in the retention of nTiO_2.
中文摘要探讨了富里酸(FA)和胡敏酸(HA)存在条件下饱和石英砂填充柱中纳米二氧化钛(nTiO_2)的迁移和滞留机制.结果表明,pH 4.0条件下,不存在FA和HA时,nTiO_2不发生迁移;FA和HA吸附到nTiO_2表面,改变nTiO_2电动性质,促进其在饱和多孔介质柱中迁移.随着FA和HA浓度由1mg/L升高至10mg/L,nTiO_2的流出率(填充柱流出液与进液中nTiO_2总量的比值)分别由0.01和0.88升高至0.91和0.94;相同条件下,HA在nTiO_2表面的吸附量比FA大,对nTiO_2迁移性的促进作用也更大.离子抑制nTiO_2的迁移,且Ca Cl2影响大于Na Cl.相同Na Cl浓度,与FA相比,HA作用下nTiO_2的迁移性更强,并且7%～56%的nTiO_2沉降在第二极小势能区,高于FA作用下的4%～17%,更易被重新释放.nTiO_2与石英砂之间的高势垒促进nTiO_2的迁移,而低势垒、第二最小势能、阻塞作用、扩散和重力沉降是nTiO_2滞留的主要原因.
资助机构国家自然科学基金项目#41171248; 国家自然科学基金项目#41601520
收录类别CSCD
语种中文
CSCD记录号CSCD:6328737
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/24673
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
中科院海岸带环境过程与生态修复重点实验室_污染过程与控制实验室
中科院海岸带环境过程与生态修复重点实验室
作者单位1.河南科技大学化工与制药学院;
2.中国科学院南京土壤研究所中国科学院土壤环境与污染修复重点实验室;
3.中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室
推荐引用方式
GB/T 7714张瑞昌,章海波,涂晨,等. 腐殖酸作用下酸性多孔介质中纳米TiO_2的迁移与滞留机制[J]. 中国环境科学,2018,38(09):3542-3551.
APA张瑞昌,章海波,涂晨,&骆永明.(2018).腐殖酸作用下酸性多孔介质中纳米TiO_2的迁移与滞留机制.中国环境科学,38(09),3542-3551.
MLA张瑞昌,et al."腐殖酸作用下酸性多孔介质中纳米TiO_2的迁移与滞留机制".中国环境科学 38.09(2018):3542-3551.
PDF全文下载地址:
点我下载PDF
