Mechanisms of mobility and retention of nano-TiO2 in acidic porous media in the presence of humus acids
ZHANG Rui-chang1,3, ZHANG Hai-bo2, TU Chen2, LUO Yong-ming3
1. Chemical Engineering and Pharmaceutics School, Henan University of Science and Technology, Luoyang 471023, China;
2. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
3. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Sciences, Chinese Academy of Sciences, Nanjing 210008, China
The mechanisms of mobility and retention of titanium dioxide nanoparticles (nTiO2) 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. nTiO2 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 nTiO2, change the electrokinetic properties of nTiO2, and facilitate the transport of nTiO2. The elution of nTiO2 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 nTiO2, and thus the facilitated effect of HA on transport of nTiO2 was stronger. Ions inhibited the mobility of nTiO2, and the effect of CaCl2 was greater than that of NaCl in same concentration. The mobility of nTiO2 was better in the presence of HA than FA. In addition, 7%~56% nTiO2 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 nTiO2 and quartz promoted the mobility of nTiO2, while a combination of the secondary minimum energy, straining, diffusion and gravitational deposition were involved in the retention of nTiO2.
张瑞昌, 章海波, 涂晨, 骆永明. 腐殖酸作用下酸性多孔介质中纳米TiO2的迁移与滞留机制[J]. 中国环境科学, 2018, 38(9): 3542-3551.
ZHANG Rui-chang, ZHANG Hai-bo, TU Chen, LUO Yong-ming. Mechanisms of mobility and retention of nano-TiO2 in acidic porous media in the presence of humus acids. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3542-3551.
Chen G X, Liu X Y, Su C M. Distinct effects of humic acid on transport and retention of TiO2 rutile nanoparticles in saturated sand columns[J]. Environmental Science & Technology, 2012,46(13):7142-7150.
[2]
Loosli F, Le Coustumer P, Stoll S. TiO2 nanoparticles aggregation and disaggregation in presence of alginate and Suwannee River humic acids. pH and concentration effects on nanoparticle stability[J]. Water Research, 2013,47(16):6052-6063.
[3]
Petosa A R, Brennan S J, Rajput F, et al. Transport of two metal oxide nanoparticles in saturated granular porous media:role of water chemistry and particle coating[J]. Water Research, 2012,46(4):1273-1285.
[4]
Chowdhury I, Hong Y, Honda R J, et al. Mechanisms of TiO2 nanoparticle transport in porous media:role of solution chemistry, nanoparticle concentration, and flowrate[J]. Journal of Colloid and Interface Science, 2011,360(2):548-555.
[5]
Godinez I G, Darnault C J G. Aggregation and transport of nano-TiO2 in saturated porous media:effects of pH, surfactants and flow velocity[J]. Water Research, 2011,45(2):839-851.
[6]
陈怀满.环境土壤学[M]. 北京:科学出版社, 2005.
[7]
Fang J, Xu M J, Wang D J, et al. Modeling the transport of TiO2 nanoparticle aggregates in saturated and unsaturated granular media:effects of ionic strength and pH[J]. Water Research, 2013,47(3):1399-1408.
[8]
Yang K, Lin D H, Xing B S. Interactions of humic acid with nanosized inorganic oxides[J]. Langmuir, 2009,25(6):3571-3576.
[9]
Zhang R C, Zhang H B, Tu C, et al. Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions[J]. Journal of Nanoparticle Research, 2015,17:165.
[10]
Litton G M, Olson T M. Colloid deposition rates on silica bed media and artifacts related to collector surface preparation methods[J]. Environmental Science & Technology, 1993,27(1):185-193.
[11]
Tufenkji N, Elimelech M. Deviation from the classical colloid filtration theory in the presence of repulsive DLVO interactions[J]. Langmuir, 2004,20(25):10818-10828.
[12]
El Badawy A M, Hassan A A, Scheckel K G, et al. Key factors controlling the transport of silver nanoparticles in porous media[J]. Environmental Science & Technology, 2013,47(9):4039-4045.
[13]
Wang D J, Su C M, Liu C X, et al. Transport of fluorescently labeled hydroxyapatite nanoparticles in saturated granular media at environmentally relevant concentrations of surfactants[J]. Colloids and Surfaces a-Physicochemical and Engineering Aspects, 2014, 457(5):58-66.
[14]
Fritz G, Schadler V, Willenbacher N, et al. Electrosteric stabilization of colloidal dispersions[J]. Langmuir, 2002,18(16):6381-6390.
[15]
Tufenkji N, Elimelech M. Correlation equation for predicting single-collector efficiency in physicochemical filtration in saturated porous media[J]. Environmental Science & Technology, 2004,38(2):529-536.
[16]
Louie S M, Tilton R D, Lowry G V. Effects of molecular weight distribution and chemical properties of natural organic matter on gold nanoparticle aggregation[J]. Environmental Science & Technology, 2013,47(9):4245-4254.
[17]
Bian S W, Mudunkotuwa I A, Rupasinghe T, et al. Aggregation and dissolution of 4nm ZnO nanoparticles in aqueous environments:influence of pH, ionic strength, size, and adsorption of humic acid[J]. Langmuir, 2011,27(10):6059-6068.
[18]
Zhang Y, Chen Y S, Westerhoff P, et al. Impact of natural organic matter and divalent cations on the stability of aqueous nanoparticles[J]. Water Research, 2009,43(17):4249-4257.
Amirbahman A, Olson T M. Deposition kinetics of humic matter-coated hematite in porous-media in the presence of Ca2+[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 1995, 99(1):1-10.
Zhang Y, Chen Y S, Westerhoff P, et al. Stability of commercial metal oxide nanoparticles in water[J]. Water Research, 2008,42(8/9):2204-2212.
[23]
Cosgrove T. Colloid science:Principles, methods and applications[M]. UK:John Wiley & Sons, 2010.
[24]
Zhou D M, Wang D J, Cang L, et al. Transport and re-entrainment of soil colloids in saturated packed column:effects of pH and ionic strength[J]. Journal of Soils and Sediments, 2011,11(3):491-503.
[25]
Song L, Elimelech M. Dynamics of colloid deposition in porous-media:modeling the role of retained particles[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 1993,73:49-63.
[26]
Torkzaban S, Tazehkand S S, Walker S L, et al. Transport and fate of bacteria in porous media:coupled effects of chemical conditions and pore space geometry[J]. Water Resources Research, 2008,44(4):W04403.
[27]
Bradford S A, Yates S R, Bettahar M, et al. Physical factors affecting the transport and fate of colloids in saturated porous media[J]. Water Resources Research, 2002,38(12):63-1-61-12.
[28]
Chen G X, Liu X Y, Su C M. Transport and retention of TiO2 rutile nanoparticles in saturated porous media under low-ionic-strength conditions:measurements and mechanisms[J]. Langmuir, 2011, 27(9):5393-5402.
[29]
Rahman T, George J, Shipley H J. Transport of aluminum oxide nanoparticles in saturated sand:effects of ionic strength, flow rate, and nanoparticle concentration[J]. Science of the Total Environment, 2013,463-464(1):565-571.
[30]
Zhuang J, Qi J, Jin Y. Retention and transport of amphiphilic colloids under unsaturated flow conditions:effect of particle size and surface property[J]. Environmental Science & Technology, 2005,39(20):7853-7859.
