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Cui Y, Wu M, Lu G, Cheng Z, Chen M, Hao Y, Mo C, Li Q, Wu J, Wu J, Hu BX. Significance of non-DLVO interactions on the co-transport of levofloxacin and titanium dioxide nanoparticles in porous media. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 351:124079. [PMID: 38692390 DOI: 10.1016/j.envpol.2024.124079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 04/22/2024] [Accepted: 04/28/2024] [Indexed: 05/03/2024]
Abstract
With the application of engineered nanomaterials and antibiotics in the fields of medicine, aerospace, new energy and agriculture, the associated contamination is detected widely in soil-groundwater systems. It is of great scientific and practical significance to deeply explore the environmental interface process between nanoparticles and antibiotics for the scientific assessment of environmental fate and ecological environmental risks, as well as the development of new composite pollution control technologies. In this study, the co-transport behaviors of positively charged titanium dioxide nanoparticles (TiO2-NPs) and negatively charged levofloxacin (LEV) in quartz sand (QS) are investigated in this study. The results show that TiO2-NPs hardly flow out when transported alone in the column because of its positive charge, which creates a strong attraction with the negatively charged quartz sand on the surface. When TiO2-NPs co-migrate with LEV in porous media, the presence of LEV promotes the transport of TiO2-NPs, while the presence of TiO2-NPs inhibits LEV transport. Non-XDLVO interactions based on molecular dynamics (MD) simulations can help explain the observed promotion and inhibition phenomena as well as the correlation between TiO2-NPs and LEV. The results indicate that TiO2-LEV complexes or aggregates can be formed during the co-transportation process of TiO2-NPs and LEV in porous media. As flow velocity increases from 0.204 cm min-1 to 1.630 cm min-1, both the transport capacities of TiO2-NPs and LEV are enhanced significantly. Under the condition of high citric acid (CA) concentration (15 mmol L-1), the transport capacity of TiO2-NPs is slightly inhibited, while the transport capacity of LEV is enhanced. This study provides new insights into the transport of nanometallic oxides and antibiotics in porous media, which suggests that non-XDLVO interactions should be considered together when assessing the environmental risks and fate of nanometallic oxides and antibiotics in soil-groundwater systems.
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Affiliation(s)
- Yiqun Cui
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou, 510632, China
| | - Ming Wu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou, 510632, China.
| | - Guoping Lu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou, 510632, China
| | - Zhou Cheng
- Guangdong Provincial Academy of Environmental Science, Guangzhou, 510045, China
| | - Meng Chen
- Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
| | - Yanru Hao
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou, 510632, China
| | - Cehui Mo
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou, 510632, China
| | - Qusheng Li
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 510632, China
| | - Jianfeng Wu
- Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China
| | - Jichun Wu
- Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China
| | - Bill X Hu
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
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2
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Shahi M, Alavi Moghaddam MR, Hosseini SM, Hashemi H, Persson M, Kowsari E. Transport and retention of functionalized graphene oxide nanoparticles in saturated/unsaturated porous media: Effects of flow velocity, ionic strength and initial particle concentration. CHEMOSPHERE 2024; 354:141714. [PMID: 38521106 DOI: 10.1016/j.chemosphere.2024.141714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 10/24/2023] [Accepted: 03/12/2024] [Indexed: 03/25/2024]
Abstract
The widespread use of nanomaterials has raised the threat of nanoparticles (NPs) infection of soils and groundwater resources. This research aims to investigate three parameters including flow velocity, ionic strength (IS), and initial particle concentration effects on transport behavior and retention mechanism of functionalization form of graphene oxide with polyvinylpyrrolidone (GO-PVP). The transport of GO-PVP was investigated in a laboratory-scale study through saturated/unsaturated (Saturation Degree = 0.91) sand columns. Experiments were conducted on flow velocity from 1.20 to 2.04 cm min-1, initial particle concentration from 10 to 50 mg L-1, and IS of 5-20 mM. The retention of GO-PVP was best described using the one-site kinetic attachment model in HYDRUS-1D, which accounted for the time and depth-dependent retention. According to breakthrough curves (BTCs), the lower transport related to the rate of mass recovery of GO-PVP was obtained by decreasing flow velocity and initial particle concentration and increasing IS through the sand columns. Increasing IS could improve the GO-PVP retention (based on katt and Smax) in saturated/unsaturated media; katt increases from 2.81 × 10-3 to 3.54 × 10-3 s-1 and Smax increases from 0.37 to 0.42 mg g-1 in saturated/unsaturated conditions, respectively. Our findings showed that the increasing retention of GO-PVP through the sand column under unsaturated condition could be recommended for the reduction of nanoparticles danger of ecosystem exposure.
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Affiliation(s)
- Mahsa Shahi
- Civil & Environmental Engineering Department (CEE), Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., 424, 15875-4413 Tehran, Iran; Division of Water Resources Engineering, Department of Building and Environmental Technology, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Mohammad Reza Alavi Moghaddam
- Civil & Environmental Engineering Department (CEE), Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., 424, 15875-4413 Tehran, Iran.
| | - Seiyed Mossa Hosseini
- Physical Geography Department, University of Tehran, 16th Azar St., Enghelab Sq, 14155-6465 Tehran, Iran
| | - Hossein Hashemi
- Division of Water Resources Engineering, Department of Building and Environmental Technology, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Magnus Persson
- Division of Water Resources Engineering, Department of Building and Environmental Technology, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Elaheh Kowsari
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., 424, 15875-4413 Tehran, Iran
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3
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Liang Y, Liu J, Dong P, Qin Y, Zhang R, Bradford SA. Retention and release of black phosphorus nanoparticles in porous media under various physicochemical conditions. CHEMOSPHERE 2023; 339:139604. [PMID: 37482317 DOI: 10.1016/j.chemosphere.2023.139604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 07/01/2023] [Accepted: 07/19/2023] [Indexed: 07/25/2023]
Abstract
Black phosphorus nanosheets/nanoparticles (BPNs) are widely applied in many fields. However, the transport of BPNs in the subsurface still has not yet been reported and there is increasing concern about potential adverse impacts on ecosystems. Roles of median grain size and surface roughness, BPN concentration, and solution chemistries (pH, ionic strength, and cation types) on the retention and release of BPNs in column experiments were therefore investigated. The mobility of BPNs significantly increased with increasing grain size and decreasing surface roughness due to their influence on the mass transfer rate, number of deposition sites and retention capacity, and straining processes. Transport of BPNs was enhanced with an increase in pH and a decrease in ionic strength because of surface deprotonation and stronger repulsion that tends to reduce aggregation. The BPN transport was significantly sensitive to ionic strength, compared with other engineered nanoparticles. Additionally, charge heterogeneity and cation-bridging played a critical role in the retention of BPNs in the presence of divalent cations. Higher input concentrations increased the retention of BPNs, probably because collisions, aggregation at pore throat locations, and hydrodynamic bridging were more pronounced. Small fractions of BPNs can be released under decreasing IS and increasing pH due to the expansion of the electrical double layer and increased repulsion at convex roughness locations. A mathematical model that includes provisions for advective dispersive transport and time-dependent retention with blocking or ripening terms well described the retention and release of BPNs. These findings provide fundamental information that helps to understand the transport of BPNs in the subsurface environments.
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Affiliation(s)
- Yan Liang
- School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
| | - Jinxing Liu
- School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Pengcheng Dong
- School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Yan Qin
- School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Rupin Zhang
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou, 510640, China
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Wei X, Pan D, Tan Q, Shi X, Hou J, Tang Q, Xu Z, Wu W, Ma B. Surface charge property governing co-transport of illite colloids and Eu(III) in saturated porous media. CHINESE CHEM LETT 2023. [DOI: 10.1016/j.cclet.2023.108275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Krishna YSR, Seetha N, Hassanizadeh SM. Experimental and numerical investigation of the effect of temporal variation in ionic strength on colloid retention and remobilization in saturated porous media. JOURNAL OF CONTAMINANT HYDROLOGY 2022; 251:104079. [PMID: 36155204 DOI: 10.1016/j.jconhyd.2022.104079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 08/27/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
Temporal variations in the chemistry of infiltrating water into the subsurface are known to cause remobilization of colloids from the grain surfaces, thereby increasing the travel distance of the colloidal contaminants. Hence, it is essential to thoroughly understand the transport, deposition, and release mechanisms of colloids in the subsurface, through laboratory experiments and modeling. There are only a few experiments in which the chemistry of inflow water is changed rapidly during colloid transport. Also, although some models have been presented for simulating the effect of transient chemistry on the fate of colloids, there is no consensus in this regard, as the proposed models suffer from shortcomings. In this study, we systematically investigated the effect of temporal variations in ionic strength on the remobilization of deposited colloids in saturated porous media through laboratory column experiments and numerical modeling. Four sets of column experiments were performed, in which we injected carboxylate-modified latex colloids at a given ionic strength for a specified period. After breakthrough of colloids, the ionic strength of inflowing water was decreased in a stepwise manner to 0 mM (DI water). The initial ionic strength values of the four experiments were 100, 50, 25, and 10 mM. We observed partial release of deposited colloids after several steps of ionic strength decrease with significant release observed only when the ionic strength was reduced to below 10 mM. We also found that the fraction of released colloids decreased with increasing value of initial ionic strength of inflow water. We have developed a mathematical model incorporating a novel formulation for ionic strength-dependent deposition and release. The model is found to capture the colloid breakthrough curves reasonably well for all experiments with the same set of parameter values, except the one at the initial ionic strength of 25 mM.
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Affiliation(s)
| | - N Seetha
- Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502284, India.
| | - S Majid Hassanizadeh
- Department of Civil Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502284, India; Stuttgart Center for Simulation Science (SIMTECH), Integrated Research Training Group SFB 1313, Stuttgart University, Germany; Department of Earth Sciences, Utrecht University, 3584, CB, Utrecht, the Netherlands
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6
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Wu M, Chen Y, Cheng Z, Hao Y, Hu BX, Mo C, Li Q, Zhao H, Xiang L, Wu J, Wu J, Lu G. Effects of polyamide microplastic on the transport of graphene oxide in porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 843:157042. [PMID: 35777558 DOI: 10.1016/j.scitotenv.2022.157042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 06/05/2022] [Accepted: 06/25/2022] [Indexed: 06/15/2023]
Abstract
With the rapid development of the nano-material and chemical industry, more and more microplastic (MP) and nano-material were discharged into the environment. In this study, a two-dimensional (2D) surface of Extended Darjaguin-Landau-Verwe-Overbeek (XDLVO) is proposed to quantitatively investigate the effect of polyamide (PA) on the transport of graphene oxide (GO) in porous media. The influences of mass fraction of PA, flow rate, GO concentration, ionic type and strength on the migration of GO in saturated porous media are investigated by column experiments and numerical models. The two-dimensional (2D) surfaces of XDLVO interaction energy between GO and GO, GO and QS, GO and PA, are firstly calculated to analyze the transport of GO in saturated porous media. Experimental results suggest the mobility of GO is enhanced when flow velocity and initial concentration of GO are increased. However, the mobility of GO is inhibited when the mass fraction of PA and ionic strength are increased. More important, the inhibitory effect of divalent cations on GO migration is stronger than that of monovalent cations. Simultaneously, XDLVO results suggest that ionic types and strengths are important factors affecting the mobility of GO in porous media, and the critical ionic strength is observed from the continuous variation of the secondary minimum trap of XDLVO interaction energy. Model results show that there is a linear relationship between the logarithm of the secondary minimum trap of XDLVO interaction energy and the parameters related to GO mobility, which suggests XDLVO energy surface has an important application significance in the accurate quantification of GO mobility in porous media. These findings contribute to GO transport affected by microplastic in porous media, thus laying a significant foundation for the environmental risk and contamination remediation.
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Affiliation(s)
- Ming Wu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China; Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
| | - Yanna Chen
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
| | - Zhou Cheng
- Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, China.
| | - Yanru Hao
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Bill X Hu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China; School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
| | - Cehui Mo
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Qusheng Li
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Haiming Zhao
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Lei Xiang
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Jianfeng Wu
- Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
| | - Jichun Wu
- Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
| | - Guoping Lu
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
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7
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Liu X, Liang Y, Peng Y, Meng T, Xu L, Dong P. Sensitivity of the Transport of Plastic Nanoparticles to Typical Phosphates Associated with Ionic Strength and Solution pH. Int J Mol Sci 2022; 23:ijms23179860. [PMID: 36077260 PMCID: PMC9455956 DOI: 10.3390/ijms23179860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 11/17/2022] Open
Abstract
The influence of phosphates on the transport of plastic particles in porous media is environmentally relevant due to their ubiquitous coexistence in the subsurface environment. This study investigated the transport of plastic nanoparticles (PNPs) via column experiments, paired with Derjaguin–Landau–Verwey–Overbeek calculations and numerical simulations. The trends of PNP transport vary with increasing concentrations of NaH2PO4 and Na2HPO4 due to the coupled effects of increased electrostatic repulsion, the competition for retention sites, and the compression of the double layer. Higher pH tends to increase PNP transport due to the enhanced deprotonation of surfaces. The release of retained PNPs under reduced IS and increased pH is limited because most of the PNPs were irreversibly captured in deep primary minima. The presence of physicochemical heterogeneities on solid surfaces can reduce PNP transport and increase the sensitivity of the transport to IS. Furthermore, variations in the hydrogen bonding when the two phosphates act as proton donors will result in different influences on PNP transport at the same IS. This study highlights the sensitivity of PNP transport to phosphates associated with the solution chemistries (e.g., IS and pH) and is helpful for better understanding the fate of PNPs and other colloidal contaminants in the subsurface environment.
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In situ reduction and self-alignment of reduced graphene oxide/poly(vinylidene fluoride) composite films: Toward high dielectric constant and suppressed loss. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hasan MS, Dong J, Gadhamshetty V, Geza M. Modeling graphene oxide transport and retention in biochar. JOURNAL OF CONTAMINANT HYDROLOGY 2022; 248:104014. [PMID: 35462133 DOI: 10.1016/j.jconhyd.2022.104014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 02/28/2022] [Accepted: 04/10/2022] [Indexed: 06/14/2023]
Abstract
Experimental data from fixed-bed column studies and a numerical model based on convection-dispersion equations were used to describe transport and retention of Graphene Oxide (GO) in sand, biochar (BC), and BC modified with nanoscale zero-valent iron (BC-nZVI). Three blocking functions, namely no blocking, site-blocking, and depth-dependent blocking, were used to analyze GO transport and retention behavior in each media as a function of Ionic Strength (IS). An inverse modeling approach was implemented to determine the attachment coefficient (Ka) and maximum solid-phase retention capacity (Smax). The Langmuirian attachment model with site-blocking function effectively described experimental GO breakthrough curves (R2 ~ 0.70-0.99) compared to other models, indicating the importance of introducing a limit on the attachment capacity of the media. The Ka values for BC and BC-nZVI were significantly higher than sand, attributable to high porosity, roughness, and surface chemical properties. The models predicted an increasing trend in Ka (0.065 to 0.615 min-1) in BC with increasing IS (0.1 to 10 mM), while Ka values decreased (2.26 to 0.349 min-1) for BC-nZVI. A consistent increase in Smax was observed for both BC and BC-nZVI with increasing IS. Scenario analysis was conducted to further understand the effect of influent IS, GO concentration, and treatment depth. BC-nZVI exhibited a higher Ka and Smax and as a result, higher GO retention than BC at lower IS (0.1 and 1.0 mM). BC-nZVI had a relatively lower Ka (0.349 min-1) at 10 mM IS, however, it outperformed BC when GO retention capacities are compared over a longer period attributable to a higher Smax (6.47). Complete GO breakthrough occurred in a 5 cm media after 350 and 465 days for BC and BC-nZVI, respectively at 10 mM IS and influent concentration of 0.1 mg·L-1. GO breakthrough time increased with increasing treatment depth, however, the relation was non-linear.
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Affiliation(s)
- Md Sazadul Hasan
- Department of Civil and Environmental engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD 57701, United States
| | - Jingnuo Dong
- Department of Civil and Environmental engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD 57701, United States
| | - Venkataramana Gadhamshetty
- 2-Dimensional Materials for Biofilm Engineering Science and Technology (2DBEST) Center, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD 57701, United States
| | - Mengistu Geza
- Department of Civil and Environmental engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD 57701, United States.
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Xu L, Liang Y, Liao C, Xie T, Zhang H, Liu X, Lu Z, Wang D. Cotransport of micro- and nano-plastics with chlortetracycline hydrochloride in saturated porous media: Effects of physicochemical heterogeneities and ionic strength. WATER RESEARCH 2022; 209:117886. [PMID: 34861437 DOI: 10.1016/j.watres.2021.117886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 11/15/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
Global production and use of plastics have resulted in the wide dissemination of micro- and nano-plastics (MNPs) to the natural environment. Potentially acting as a vector, the role of MNPs on the fate and transport of environmental pollutants (e.g., antibiotics such as chlortetracycline hydrochloride; CTC) has garnered global concern recently. Herein, the cotransport of MNPs and CTC in columns packed with uncoated sand or soil colloid-coated sand (SCCS) under different degrees of physicochemical heterogeneity and ionic strength was systematically explored. Our results show that MNPs and CTC inhibit the transport of each other when they coexist. The adsorption of CTC onto sand grains, soil colloids, and MNPs, as well as the aggregation of MNPs in the presence of CTC could be the major contributors to the enhanced retention of CTC and MNPs. In SCCS with different degrees of soil colloid coating, the adsorption of CTC on soil colloids is critical to influence the transport of CTC, and the nonlinear retention of MNPs to soil colloids is mainly attributed to the alteration of collector surface roughness by soil colloids. High ionic strength slightly facilitates CTC transport due to the competition for adsorption sites and the formation of CTC macromolecules, but significantly inhibits MNPs transport by suppressing the electrostatic double layers based on colloid stability theory. Consequently, the cotransport of MNPs and CTC is governed by the coupled interplay of collector surface roughness and chemical heterogeneity, due to the soil colloid coatings and the adsorbed CTC on the surfaces associated with solution chemistries such as ionic strength. Increased cotransport of MNPs and CTC occurred under a higher concentration of MNPs due to a larger number of adsorption sites for CTC. Our findings advance the current understanding of the complex cotransport of MNPs and antibiotics in the environment. This information is valuable for understanding contaminant fate and formulating strategies for environmental remediation due to the contamination of MNPs and co-occurring contaminants.
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Affiliation(s)
- Lilin Xu
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Yan Liang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, China.
| | - Changjun Liao
- Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, China
| | - Tian Xie
- Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, China
| | - Hanbin Zhang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Xingyu Liu
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Zhiwei Lu
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Dengjun Wang
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, AL 36849, United States
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Xu Z, Niu Z, Pan D, Zhao X, Wei X, Li X, Tan Z, Chen X, Liu C, Wu W. Mechanisms of bentonite colloid aggregation, retention, and release in saturated porous media: Role of counter ions and humic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 793:148545. [PMID: 34328966 DOI: 10.1016/j.scitotenv.2021.148545] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 06/13/2021] [Accepted: 06/15/2021] [Indexed: 06/13/2023]
Abstract
In the subsurface environment, colloids play an important role in pollutant transport by acting as the carriers. Understanding colloid release, transport, and deposition in porous media is a prerequisite for evaluating the potential role of colloids in subsurface contaminant transport. In this work, the aggregation, retention, and release of bentonite colloid in saturated porous sand media were investigated by kinetic aggregation and column experiments, the correlation and mechanism of these processes were revealed by combining colloid filtration theory, interaction energy calculation and density functional theory. The results showed that the retention and release of colloids were closely related to the dispersion stability and filtration effect. Multivalent cations with higher mineral affinity reduced the colloid stability, and the dispersion stability and mobility of the colloid were greatly improved by humic acid due to the enhancement of electrostatic repulsion and steric hindrance effects. The primary minimum interaction was found to contribute more to irreversible colloid retention in a Ca2+ system, while the secondary energy minimum was found to be responsible for colloid release with the occurrence of transient solution chemistry. The deposited colloid aggregates could be redistributed and released when the solution chemistry became favorable towards dispersion. These findings provide essential insight into the environmental colloid fate as well as a vital reference for the risk of colloid-driven transport of contaminants in the subsurface aquifer environment.
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Affiliation(s)
- Zhen Xu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Zhiwei Niu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Duoqiang Pan
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China.
| | - Xiaodong Zhao
- Department of Chemistry, Washington State University, Pullman, WA 99164, United States
| | - Xiaoyan Wei
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Xiaolong Li
- China Academy of Engineering Physics, Mianyang 621000, China
| | - Zhaoyi Tan
- China Academy of Engineering Physics, Mianyang 621000, China
| | - Ximeng Chen
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Chunli Liu
- Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry and Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Wangsuo Wu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
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12
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Won J, Kim T, Kang M, Choe Y, Choi H. Kaolinite and illite colloid transport in saturated porous media. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Bai H, Chen J, Gao W, Yang B, Yan Y, Liu W, Wang G, Lamy E. Transport and retention of bacteria through a filtration system consisting of sands and geotextiles. Colloids Surf B Biointerfaces 2021; 208:112114. [PMID: 34562783 DOI: 10.1016/j.colsurfb.2021.112114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/15/2021] [Accepted: 09/09/2021] [Indexed: 01/22/2023]
Abstract
Water-saturated column experiments were conducted to study the effect of nonwoven geotextiles on bacteria transport and deposition through two sandy porous media with grain sizes 1.05 and 3.25 mm. The breakthrough curves (BTCs) of tracer for the all porous media exhibited an asymmetrical shape with a substantial tailing, indicating that non-equilibrium and dispersive flow patterns in these porous media. The mass recovery of the bacteria from the effluent (Meff) increased with grain size. The retention profiles (RPs) exhibited hyper-exponential behavior, especially in the finer sand. The presence of the geotextiles increased bacteria retention rate. For a given geotextile, greater retention was observed in the surrounding region close to the geotextile. Moreover, the retention of bacteria became more significant in the geotextile with a lower porosity. Results demonstrated that model simulations of bacteria transport and fate need to accurately account for both observed BTC and RP behaviors and also the geotextile placement can impact mechanisms of retention.
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Affiliation(s)
- Hongjuan Bai
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
| | - Junhang Chen
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China
| | - Weiqiang Gao
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China
| | - Beibei Yang
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China
| | - Yufeng Yan
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China
| | - Wenju Liu
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
| | - Gang Wang
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
| | - Edvina Lamy
- Sorbonne université, Université de Technologie de Compiègne, UTC/ESCOM, EA 4297 TIMR, Centre de recherche Royallieu, CS 60 319, 60 203 Compiègne cedex, France
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14
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Xu Z, Niu Z, Tang Q, Wei X, Chen X, Pan D, Wu W. Adsorption characteristics of Eu(III) on colloidal bentonite particles in aqueous solution: impact of colloid concentration, pH, foreign ions, and temperature. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07976-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Nishad S, Al-Raoush RI, Alazaiza MY. Release of colloids in saturated porous media under transient hydro-chemical conditions: A pore-scale study. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126188] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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16
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Wang M, Zuo Q, Bai Y. Effects of filtration-induced size change on the subsequent transport and fate of graphene oxide in saturated porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 755:142417. [PMID: 33049539 DOI: 10.1016/j.scitotenv.2020.142417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 08/07/2020] [Accepted: 09/13/2020] [Indexed: 06/11/2023]
Abstract
A particle size change occurs ubiquitously during transport of nanoparticles in the subsurface and is likely to influence nanoparticle fate and transport behaviours. The effects of this size change on the subsequent transport of eluted graphene oxide (GO) in saturated media were therefore investigated under various ionic strength (IS) and filtration degree conditions. Aggregation kinetics revealed that size change after filtration only occurred at relatively high IS conditions. As the filtration column length increased from 15 cm to 30 cm, sizes of aggregates in filtrates for large-sized and small-sized GO populations decreased and increased, respectively, and both approached to their steady aggregate sizes. Aggregation, straining, sedimentation, bridging, DLVO interactions, or a combination of these mechanisms were involved in the size change process during filtration. After passing through the 30 cm filtration column, filtered GO, in comparison with original GO, exhibited stronger mobility than expected, suggesting neglecting size change will result in underestimation of the nanoparticle mobility in porous media.
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Affiliation(s)
- Mei Wang
- School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China; Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou 450001, China; Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou 450001, China.
| | - Qiting Zuo
- School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China; Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou 450001, China; Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou 450001, China
| | - Yifan Bai
- Yellow River Engineering Consulting Corporation Limited, Zhengzhou 450003, China
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17
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Hasan MS, Geza M, Petersen JB, Gadhamshetty V. Graphene oxide transport and retention in biochar media. CHEMOSPHERE 2021; 264:128397. [PMID: 33032229 DOI: 10.1016/j.chemosphere.2020.128397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 09/11/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
This study explores the use of biochar (BC), an inexpensive filtration media, for removing graphene oxide (GO) contaminants from the aquatic subsurface environments. Mass balance approaches and column dissection tests were used to analyze the retention behavior of GO in a series of model fixed-bed columns as a function of ionic strength (IS) and flowrate. The column based on the biochar media (BC) displayed 3.6-fold higher retention compared to the quartz sand (control). To overcome the challenges of unfavorable electrostatic interactions between GO and BC, we used a facile functionalization strategy to modify the BC surfaces with nanoscale zero-valent iron (BC-nZVI). The BC-nZVI (5:1, w/w) retained 2.6-fold higher amounts of GO compared with bare biochar. Furthermore, the performance of BC-nZVI increased with decreasing values of IS, attributed to the attachment of GO to nZVI where nZVI was partially dissolved by the presence of higher chloride ion at high IS. A better GO retention (86%) at higher IS was observed in BC where the GO was primarily retained due to the higher aggregation via straining.
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Affiliation(s)
- Md Sazadul Hasan
- Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, United States
| | - Mengistu Geza
- Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, United States.
| | - Jacob B Petersen
- Engineering and Mining Experiment Station, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, United States
| | - Venkataramana Gadhamshetty
- Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, United States; 2-Dimensional Materials for Biofilm Engineering Science and Technology (2DBEST) Center, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, United States
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18
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Ramazanpour Esfahani A, Batelaan O, Hutson JL, Fallowfield HJ. Transport and retention of graphene oxide nanoparticles in sandy and carbonaceous aquifer sediments: Effect of physicochemical factors and natural biofilm. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 278:111419. [PMID: 33126193 DOI: 10.1016/j.jenvman.2020.111419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/25/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
There is a paucity of information regarding the interaction between GONPs and natural aquifer sediments. Therefore, batch and column experiments were carried out to determine the transport, retention and attachment behavior of GONPs with the surfaces of native aquifer sediments. The experiments were performed with sediments comprising contrasting mineralogical features (sand grains, quartz and limestone sediments), at different temperatures, ionic strength and compositions. Uniquely, this research also investigated the effect of natural biofilm on the retention behavior of nanoparticles in porous media. The retention rate of GONPs at 22 °C was higher than at 4 °C. Moreover, there was greater retention of GONPs onto the surfaces of collectors at higher ionic strengths and cation valence. The retention profiles (RPs) of GONPs in pristine porous media at low ionic strength were linear, which contrasted with hyper-exponential shape of RPs at high ionic strength. The size-distribution analysis of retained GONPs showed decreasing particle diameter with increasing distance from the column inlet at high ionic strength and equal diameter at low ionic strengths. The GONP retention rate was higher for natural porous media than for sand, due to the presence of metal oxides heterogeneities. The presence of biofilm on porous media increased the retention rate of GONPs when compared to the porous media in the absence of biofilm.
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Affiliation(s)
- Amirhosein Ramazanpour Esfahani
- College of Science and Engineering, Flinders University, Adelaide, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia.
| | - Okke Batelaan
- College of Science and Engineering, Flinders University, Adelaide, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia
| | - John L Hutson
- College of Science and Engineering, Flinders University, Adelaide, Australia
| | - Howard J Fallowfield
- College of Science and Engineering, Flinders University, Adelaide, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia
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19
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Zhang D, Qiu J, Shi L, Liu Y, Pan B, Xing B. The mechanisms and environmental implications of engineered nanoparticles dispersion. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137781. [PMID: 32199363 DOI: 10.1016/j.scitotenv.2020.137781] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/28/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Dispersion of engineered nanoparticles (ENPs) has drawn special research attentions because the environmental behavior, risks, and applications of ENPs are greatly dependent on their dispersing status. This review summarizes the latest research progress of dispersion mechanisms, environmental applications in contaminants adsorption, and toxicity of ENPs dispersed in liquid and in solid matrix (3D-ENPs). Dispersion mechanisms of ENPs, including steric hindrance, electrostatic repulsion and "micelle wrapping" are well understood in single dispersing agent, however, the prediction of ENPs dispersion in real environments is not straightforward because of the diversity of structures, components, and properties of natural organic molecule mixtures. The adsorption characteristics, depending on the exposed surface areas in liquid, are significantly different between dispersed and aggregated ENPs. Comparing with the aggregated ENPs, the toxicity of dispersed ENPs is generally enhanced due to the increased uptake, released metal ions, carried contaminants, and induced ROS. 3D-ENPs not only inherit the excellent adsorption performance of ENPs dispersed in liquid, but also are beneficial to the separation and recycle from aqueous solutions due to their 3D rigid structures. However, the adsorption mechanisms as affected by environmental conditions are still unclear. Additionally, the potential risks of 3D-ENPs should be paid more attentions, with an emphasis on free radicals and stability of 3D structure.
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Affiliation(s)
- Di Zhang
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Junke Qiu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Lin Shi
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Yang Liu
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
| | - Bo Pan
- Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China; Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China.
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States.
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20
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Ramazanpour Esfahani A, Batelaan O, Hutson JL, Fallowfield HJ. Effect of bacteria and virus on transport and retention of graphene oxide nanoparticles in natural limestone sediments. CHEMOSPHERE 2020; 248:125929. [PMID: 32014635 DOI: 10.1016/j.chemosphere.2020.125929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 12/20/2019] [Accepted: 01/14/2020] [Indexed: 06/10/2023]
Abstract
This research was conducted to evaluate the effect of co-transport of different-sized microorganisms on graphene oxide nanoparticles (GONPs) transport and retention in saturated pristine and biofilm-conditioned limestone columns. The transport and retention behavior of GONPs was studied in columns in the presence of MS2 -as a nano-sized- and Escherichia coli (E.coli) -as a micro-sized- microorganisms at low and high ionic strength conditions. Results showed no changes in GONPs transport and retention at high ionic strength in the presence of MS2 or E. coli, which was attributed to the effect of high concentration of divalent cation on aggregation of nanoparticles and microorganisms. Furthermore, simultaneous enhanced transport and decreased retention of GONPs in column was observed in the co-presence of microorganisms at low ionic strength. Results revealed that the main mechanism governing increasing GONPs transport in porous media was occupation of reactive surface sites of collectors by microorganisms, which prevented attachment of nanoparticles. The pre-saturation of columns with MS2 and E. coli caused increasing transport of GONPs in the columns, due to the occupation of surface reactive sites. Moreover, conditioning limestone collectors with natural biofilm resulted in the same rates of nanoparticle elution and retention (i.e., in the presence or absence of microorganisms) by straining of GONPs in the inlet end of columns which shows that the biofilm acts as a bio-filter against discharging nanoparticles into the effluents. Finally, from the obtained results, it can be postulated that the presence of microorganisms in a MAR site causes risk of groundwater pollution by toxic nanoparticles.
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Affiliation(s)
- Amirhosein Ramazanpour Esfahani
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia.
| | - Okke Batelaan
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia
| | - John L Hutson
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - Howard J Fallowfield
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia; National Centre for Groundwater Research and Training, SA, 5001, Australia
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21
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Georgopoulou MP, Syngouna VI, Chrysikopoulos CV. Influence of graphene oxide nanoparticles on the transport and cotransport of biocolloids in saturated porous media. Colloids Surf B Biointerfaces 2020; 189:110841. [DOI: 10.1016/j.colsurfb.2020.110841] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 12/28/2019] [Accepted: 02/01/2020] [Indexed: 01/19/2023]
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22
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Lu L, Chen B. Biochar-amendment-reduced cotransport of graphene oxide nanoparticles and dimethyl phthalate in saturated porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 705:135094. [PMID: 31837545 DOI: 10.1016/j.scitotenv.2019.135094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 10/17/2019] [Accepted: 10/19/2019] [Indexed: 06/10/2023]
Abstract
Production and application of graphene oxide (GO) and biochar for water and soil treatment is steadily growing, driving the necessity to understand the cotransport behavior of contaminants and GO nanoparticles in porous media and the possible effect of biochar to reduce their cotransport. The cotransport of GO nanoparticles and dimethyl phthalate (DMP) as a model in a sand column and biochar-amended sand column (biochar column) was compared. The transport of DMP in the test columns was independent of the solution ionic strength (IS), while the transport of GO decreased with increased IS due to the enhanced aggregation of GO nanoparticles. The sand column had no retention capacity (less than 1%) for DMP, while the biochar column had significantly increased retention of DMP (100%). The retention of GO in the biochar column was significantly higher than that of the sand column because biochar can improve the roughness of the media and adsorb GO via π-π interactions. Under low-IS conditions, GO facilitated DMP transport by providing vehicles and adsorption sites (vehicle effect). Due to reversible adsorption-desorption, the adsorbed DMP on GO could be released, resulting in tailing during the flushing phase. The vehicle effect of GO on DMP transport was significantly weakened in the biochar columns, and DMP tailing during the flushing phase was not observed in the biochar columns, which was attributed to the strong retention/adsorption of the biochar columns for both GO and DMP, higher affinity of DMP on biochar than GO, and desorption hysteresis of DMP on biochar. These observations are important for evaluating the potential role of biochar in soil and water remediation, as well as mitigating the health risks of GO and organic contaminants in the environment.
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Affiliation(s)
- Lun Lu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollutant Process and Control, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollutant Process and Control, Zhejiang University, Hangzhou, Zhejiang 310058, China.
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23
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Abstract
This study used polystyrene latex colloids as model microplastic particles (MPs) and systematically investigated their retention and transport in glass bead-packed columns. Different pore volumes (PVs) of MP influent suspension were first injected into the columns at different ionic strengths (ISs). The breakthrough curves (BTCs) were obtained by measuring the MP concentrations of the effluents. Column dissection was then implemented to obtain retention profiles (RPs) of the MPs by measuring the concentration of attached MPs at different column depths. The results showed that the variation in the concentrations of retained MPs with depth changed from monotonic to non-monotonic with the increase in the PV of the injected influent suspension and solution IS. The non-monotonic retention was attributed to blocking of MPs and transfer of these colloids among collectors in the down-gradient direction. The BTCs were well simulated by the convection-diffusion equation including two types of first-order kinetic deposition (i.e., reversible and irreversible attachment). However, this model could not well simulate the non-monotonic retention profiles due to the fact that the transfer of colloids among collectors was not considered. The results in this study are critical to developing models to simulate the fate and transport of MPs in porous media such as soil.
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He J, Wang D, Zhang W, Zhou D. Deposition and release of carboxylated graphene in saturated porous media: Effect of transient solution chemistry. CHEMOSPHERE 2019; 235:643-650. [PMID: 31276877 DOI: 10.1016/j.chemosphere.2019.06.187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/21/2019] [Accepted: 06/24/2019] [Indexed: 06/09/2023]
Abstract
Chemical perturbation of pore-water in porous media may remobilize and release deposited colloids/nanomaterials into bulk flow. This re-entrainment process is important to accurately assessing the fate and transport of colloids/nanomaterials in the subsurface. This study investigated deposition and subsequent release of carboxylated graphene nanomaterials (CG) in water-saturated sand columns by first depositing CG at 100 mM NaCl or 2 mM CaCl2 (Phase 1), followed by Phase 2 (elution with sequences of 50, 10, and 1 mM NaCl, or sequences of 0.5 and 0.1 mM CaCl2), and then Phase 3 elution using deionized water. Approximate 89.2%-98.7% of injected CG was retained in sand through Derjaguin-Landau-Verwey-Overbeek (DLVO) interactions, Ca2+ bridging, and straining in Phase 1. Sequential reduction of ionic strength in Phases 2 and 3 resulted in increased release of deposited CG mainly due to the expansion of the electrical double layer thickness and thus decreased depth of the attractive secondary minimum. With increasing pulses of flushing solution, unrecoverable CG increased because weakly associated CG via the secondary minimum was likely translated to immobile regions. Significant tailing of CG released in Phase 3 suggests that CG retained in CaCl2 was more resistant upon detachment than in NaCl. In cation exchange experiment, only 0.7% of applied CG was released, possibly ascribed to the CG remobilized by cation exchange was immediately re-entrained by the secondary minimum in 50 mM NaCl. Our findings indicate that retained nanomaterials (e.g., CG) can be remobilized and transported downward in transient solution chemistries, raising concerns about their potential migration risk to groundwater.
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Affiliation(s)
- Jianzhou He
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, United States
| | - Dengjun Wang
- National Research Council Resident Research Associate at the U.S. Environmental Protection Agency, Ada, OK, 74820, United States.
| | - Wei Zhang
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, United States
| | - Dongmei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
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Zeng Z, Wang Y, Zhou Q, Yang K, Lin D. New insight into the aggregation of graphene oxide in synthetic surface water: Carbonate nanoparticle formation on graphene oxide. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 250:366-374. [PMID: 31022642 DOI: 10.1016/j.envpol.2019.03.112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 03/25/2019] [Accepted: 03/27/2019] [Indexed: 06/09/2023]
Abstract
Graphene oxide (GO), used in a wide variety of applications, is increasingly being introduced into aquatic environments; this situation calls for research on GO aggregation and sedimentation to regulate the environmental behaviors and risks. Many studies have investigated the aggregation and the mechanism of GO in water with a single background salt (monosalt system); however, this may not reflect real water environments where multiple salts coexist (multisalt system). A typical synthetic surface water (soft water) with representative multisalts was therefore used to study the aggregation and sedimentation of GO. The GO concentration-dependent aggregation (low concentration aggregation, high concentration stability) was observed in the soft water, and this concentration-dependent aggregation is opposite to the aggregation in monosalt systems (NaCl or CaCl2 solutions). The presence of GO sheets induced the formation of amorphous CaMg(CO3)2 nanoparticles on the GO surfaces in the soft water, and the formed nanoparticles promoted the aggregation and sedimentation of low concentrations of GO through bridging action. Neutral and alkaline conditions were favorable for the formation of CaMg(CO3)2 nanoparticles and the induced GO aggregation. These findings show a new mechanism of GO aggregation in environmentally relevant waters and help us to better evaluate the environmental fate of GO.
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Affiliation(s)
- Zhiyuan Zeng
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Yanlong Wang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Qingbo Zhou
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Kun Yang
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou, 310058, China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou, 310058, China.
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