Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2017, Vol. 53 ›› Issue (4): 749-757.DOI: 10.13209/j.0479-8023.2017.090

• Orginal Article • Previous Articles     Next Articles

Influence of Typical Anions on the Transport of Titanium Dioxide Nanoparticles in Iron Oxide-Coated Porous Media

Xiaoting LUO1,2, Dan WU2, Jialiang LIANG2, Meiping TONG1,2()   

  1. 1. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055
    2. Key Laboratory of Water and Sediment Sciences (MOE); College of Environmental Sciences and Engineering, Peking University, Beijing 100871
  • Received:2016-03-07 Revised:2016-04-12 Online:2017-05-12 Published:2017-07-20


罗小廷1,2, 吴丹2, 梁嘉良2, 童美萍1,2()   

  1. 1. 北京大学深圳研究生院环境与能源学院, 深圳 518055
    2. 水沙科学教育部重点实验室, 北京大学环境科学与工程学院, 北京 100871
  • 基金资助:


This study investigated the effects of typical anions such as Cl-, NO3-, SO42-, and PO43- on the transport and deposition behaviors of titanium dioxide nanoparticles (nTiO2) in iron oxide-coated sand under environmental related conditions (ionic strength and pH). In iron oxide-coated sand, the breakthrough curves and retained profiles of nTiO2 were equivalent in NaCl, NaNO3, and Na2SO4 solutions. However, under the same solution conditions (ionic strength and pH), the breakthrough curves of nTiO2 in the NaH2PO4 solution were higher yet the retained profiles were lower relative to other three solutions. The results indicated that under the examined solution conditions (pH and ionic strength), Cl-, NO3-, and SO42- had similar effects on the transport of nTiO2 in iron-coated sand, yet the presence of PO43- could facilitate the transport of nTiO2. The alteration of the surface properties of both nanoparticles and porous media, the change of particle sizes, as well as the competition of deposition sites on sand grain surfaces by PO43- ions contributed to the increased nTiO2 transport in iron oxide-coated sand in NaH2PO4 solutions.

Key words: titanium dioxide nanoparticles, anions, transport, deposition, porous media


以纳米二氧化钛为研究对象, 考察系列环境相关条件下(不同pH、离子类型与离子强度)纳米二氧化钛在载铁石英砂多孔介质中的迁移规律。结果表明, 纳米二氧化钛在NaCl, NaNO3和Na2SO4 3种溶液中的穿透曲线和滞留曲线没有显著差异, 但与其他溶液相比, 在NaH2PO4溶液中的穿透曲线和滞留曲线分别有明显的升高和降低; 磷酸根离子会促进纳米二氧化钛在载铁石英砂多孔介质中的迁移行为。机理探究发现, 由于PO43-会被吸附至纳米二氧化钛和载铁石英砂多孔介质的表面上, 增大纳米二氧化钛和多孔介质的表面Zeta电位, 导致纳米二氧化钛与介质表面之间静电斥力的增加, 从而加大纳米二氧化钛被吸附于多孔介质表面位点的难度, 减少沉积; 同时, 纳米二氧化钛Zeta电位的增加会减少纳米二氧化钛颗粒间的碰撞团聚, 导致其水力学粒径变小, 从而促进其迁移行为。此外, PO43-会与纳米二氧化钛竞争多孔介质表面的吸附位点, 导致纳米二氧化钛可沉积位点的减少, 增加迁移能力。

关键词: 二氧化钛, 阴离子, 迁移, 沉积, 多孔介质

CLC Number: