溶解性有机质的表面吸附行为及其对金属基纳米颗粒环境行为的影响
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摘要
随着纳米科技的不断进步,越来越多的金属基纳米颗粒(MNPs)被添加到油漆、除草剂、杀虫剂等产品中.其大量应用使得MNPs在储存、运输、使用以及处理等过程中不可避免地进入到环境中,从而对生物乃至人类健康产生威胁.环境中丰富的溶解性有机质(DOMs)容易通过静电吸引、配体交换、疏水性等作用吸附到纳米颗粒的表面,从而影响MNPs的迁移转化及生态效应.DOMs的吸附可能会降低MNPs表面电势,加速颗粒聚集,或堵塞表面微孔而减小颗粒的有效暴露面积,抑制金属离子的释放;DOMs吸附也可能增加其释放出的金属离子发生络合反应的几率,从而促进MNPs的溶解.以上矛盾结论的产生是因为DOMs在MNPs表面的吸附行为机制还不十分清晰,有待更深入的研究.因此,本文就DOMs在MNPs表面产生吸附的机理,及其对MNPs聚集、分散及溶解等过程产生的影响进行了系统的评述,并重点剖析了如何量化DOMs在MNPs表面的吸附作用,及不同环境因子对DOMs在MNPs表面的吸附行为的影响,提出为了提高MNPs环境行为及生态效应评估的准确性,建立DOMs吸附作用与MNPs聚集、分散和溶解间的相关关系将是今后研究的重点.
More and more metal-based nanoparticles(MNPs) have been added to products such as paints, herbicides and pesticides owing to the continuous improvement of nanotechnology. The wide application of MNPs makes them inevitably enter the environment duringstorage, transportation, use and processing, thus threatening the health of environmental organisms and even human beings. Dissolved organic matters(DOMs) are abundant in the environment. They are easily adsorbed on the surface of MNPs by electrostatic attraction, ligand exchange and hydrophobic interactions, which affect the migration, transformation and ecological effects of MNPs in the environment. On the one hand, the adsorption of DOMs onto the surface of MNPs may lead to the decrease of their surface potential, which makes MNPs easy to aggregate. DOMs can also block the micropore on the surface of MNPs and reduce the effective specific surface area of MNPs exposed to the medium, thus inhibiting the release of metal ions from MNPs. On the other hand, the adsorption of DOMs onto the surface of MNPs may increase the possibility of complexing metal ions with DOMs, thereupon promoting the dissolution of MNPs. However, at present, the adsorption mechanism of DOMs onto the surface of MNPs is still unclear, which leads to the contradiction of the above conclusions and needs further investigation. Therefore, this article systematically reviewed the underlying adsorption mechanisms of DOMs onto the surface of MNPs, and their potential effects on the aggregation, dispersion and dissolution of MNPs. It also focused on how to quantitatively determine the adsorption of DOMs onto the surface of MNPs, and how to describe the influence of different environmental factors on DOMs adsorption onto the surface of MNPs. To improve the accuracy for assessing the environmental behaviors and ecological effects of MNPs, the relationship between the adsorption of DOMs and the aggregation, dispersion and dissolution of MNPs should be well understood.
More and more metal-based nanoparticles(MNPs) have been added to products such as paints, herbicides and pesticides owing to the continuous improvement of nanotechnology. The wide application of MNPs makes them inevitably enter the environment duringstorage, transportation, use and processing, thus threatening the health of environmental organisms and even human beings. Dissolved organic matters(DOMs) are abundant in the environment. They are easily adsorbed on the surface of MNPs by electrostatic attraction, ligand exchange and hydrophobic interactions, which affect the migration, transformation and ecological effects of MNPs in the environment. On the one hand, the adsorption of DOMs onto the surface of MNPs may lead to the decrease of their surface potential, which makes MNPs easy to aggregate. DOMs can also block the micropore on the surface of MNPs and reduce the effective specific surface area of MNPs exposed to the medium, thus inhibiting the release of metal ions from MNPs. On the other hand, the adsorption of DOMs onto the surface of MNPs may increase the possibility of complexing metal ions with DOMs, thereupon promoting the dissolution of MNPs. However, at present, the adsorption mechanism of DOMs onto the surface of MNPs is still unclear, which leads to the contradiction of the above conclusions and needs further investigation. Therefore, this article systematically reviewed the underlying adsorption mechanisms of DOMs onto the surface of MNPs, and their potential effects on the aggregation, dispersion and dissolution of MNPs. It also focused on how to quantitatively determine the adsorption of DOMs onto the surface of MNPs, and how to describe the influence of different environmental factors on DOMs adsorption onto the surface of MNPs. To improve the accuracy for assessing the environmental behaviors and ecological effects of MNPs, the relationship between the adsorption of DOMs and the aggregation, dispersion and dissolution of MNPs should be well understood.
引文
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[8] KTEEBA S M,EL-ADAWI H I,EL-RAYIS O A,et al.Zinc oxide nanoparticle toxicity in embryonic zebrafish:Mitigation with different natural organic matter[J].Environmental Pollution,2017,230:1125-1140.
[9] DALAI S,ISWARYA V,BHUVANESHWARI M,et al.Different modes of TiO2 uptake by Ceriodaphnia dubia:relevance to toxicity and bioaccumulation[J].Aquatic Toxicology,2014,152(4):139-146.
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[11] WANG Z,XIA B,CHEN B,et al.Trophic transfer of TiO2 nanoparticles from marine microalga (Nitzschia closterium) to scallop (Chlamys farreri) and related toxicity[J].Environmental Science Nano,2016,4(2):415-424.
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[13] NEBBIOSO A,PICCOLO A.Molecular characterization of dissolved organic matter (DOM):A critical review[J].Analytical & Bioanalytical Chemistry,2013,405(1):109-124.
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[17] REN M,HORN H,FRIMMEL F H.Aggregation behavior of TiO2 nanoparticles in municipal effluent:Influence of ionic strengthen and organic compounds[J].Water Research,2017,123:678-686.
[18] YU S,LIU J,YIN Y,et al.Interactions between engineered nanoparticles and dissolved organic matter:A review on mechanisms and environmental effects[J].Journal of Environmental Sciences,2018,63(1):198-217.
[19] GHOSH S,JIANG W,MCCLEMENTS J D,et al.Colloidal stability of magnetic iron oxide nanoparticles:Influence of natural organic matter and synthetic polyelectrolytes[J].Langmuir,2011,27(13):8036-8043.
[20] PHILIPPE A,SCHAUMANN G E.Interactions of dissolved organic matter with natural and engineered inorganic colloids:A review[J].Environmental Science & Technology,2014,48(16):8946-8962.
[21] JAYALATH S,WU H,LARSEN S C,et al.Surface adsorption of Suwannee river humic acid on TiO2 nanoparticles:A Study of pH and particle size[J].Langmuir the Acs Journal of Surfaces & Colloids,2018,34(9):3136-3145.
[22] CHEN W,QIAN C,LIU X Y,et al.A two-dimensional correlation spectroscopic analysis on the interaction between humic acids and TiO2 nanopaticles[J].Environmental Science & Technology,2014,48(19):11119-11126.
[23] YANG K,LIN D,XING B.Interactions of humic acid with nanosized inorganic oxides[J].Langmuir,2009,25(6):3571-3576.
[24] JOHNSON S B,YOON T H,KOCAR B D,et al.Adsorption of organic matter at mineral/water interfaces.2.Outer-sphere adsorption of maleate and implications for dissolution processes[J].Langmuir,2004,20(12):4996-5006.
[25] 郭金仓.金属氧化物/水界面上NOM吸附机制的研究[D].武汉:武汉理工大学,2009.GUO J C.Study on NOM adsorption mechanism on metal oxide/water surface[D].Wuhan:Wuhan University of Technology,2009 (in Chinese).
[26] JOHNSON S B,YOON T H,SLOWEY A J,et al.Adsorption of organic matter at mineral/water interfaces:3.Implications of surface dissolution for adsorption of oxalate[J].Langmuir the ACS Journal of Surfaces & Colloids,2004,20(26):11480-11492.
[27] 胡慧萍,王梦,丁治英,等.FT-IR、XPS和DFT研究水杨酸钠在针铁矿或赤铁矿上的吸附机理[J].物理化学学报,2016,32(8):2059-2068.HU H P,WANG M,DING Z Y,et al.FT-IR,XPS and DFT study of the adsorption mechanism of sodium salicylate onto goethite or hematite[J].Journal of Physical Chemistry,2016,32(8):2059-2068 (in Chinese).
[28] SUN D D,PEI F L.TiO2 microsphere for the removal of humic acid from water:Complex surface adsorption mechanisms[J].Separation & Purification Technology,2012,91(19):30-37.
[29] FAN J,LIU F,HU Y,et al.Effects of pH and ionic composition on sorption/desorption of natural organic matter on zero-valent iron and magnetite nanoparticles[J].Water Science and Technology,2015,72(2):303-310.
[30] 姚晨曦,杨春信,周成龙.Langmuir吸附等温式推导浅析[J].化学与生物工程,2018,35(1):31-35.YAO C X,YANG C X,ZHOU C L.Brief analysis of deduction of langmuir adsorption isotherm[J].Chemical and Biological Engineering,2018(1):31-35 (in Chinese).
[31] RAHMAN M S,WHALEN M,GAGNON G A.Adsorption of dissolved organic matter (DOM) onto the synthetic iron pipe corrosion scales (goethite and magnetite):Effect of pH[J].Chemical Engineering Journal,2013,234(12):149-157.
[32] 郭惠莹,梁妮,周丹丹,等.天然有机质模型化合物在无机矿物表面的吸附[J].环境化学,2017,36(3):564-571.GUO H Y,LIANG N,ZHOU D D,et al.Adsorption mechanisms of natural organic matter model compounds on inorganic minerals[J].Environmental Chemistry,2017,36(3):564-571 (in Chinese).
[33] YANG K,XING B.Adsorption of organic compounds by carbon nanomaterials in aqueous phase:Polanyi theory and its application[J].Cheminform,2010,110(10):5989-6008.
[34] YANG K,ZHU L,XING B.Adsorption of polycyclic aromatic hydrocarbons by carbon nanomaterials[J].Environmental Science & Technology,2006,40(6):1855-1861.
[35] FRANCO C A,CORTéS F B,NASSAR N N.Adsorptive removal of oil spill from oil-in-fresh water emulsions by hydrophobic alumina nanoparticles functionalized with petroleum vacuum residue[J].Journal of Colloid & Interface Science,2014,425(7):168-177.
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