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Wu W, Han L, Chen X, Zhang W, Yang L, Chen H, Hou S, Li J, Chen M. The impact of heteroaggregation between nZVI and SNPs on the co-transport of Cd(II) in saturated sand columns. WATER RESEARCH 2024; 258:121822. [PMID: 38796915 DOI: 10.1016/j.watres.2024.121822] [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: 02/23/2024] [Revised: 04/25/2024] [Accepted: 05/21/2024] [Indexed: 05/29/2024]
Abstract
This study investigated the co-transport behaviors of nano zero-valent iron (nZVI) and Cd(II) in the presence of soil nanoparticles (SNPs) under various SNPs/nZVI mass ratios. It was illustrated that the mobility of colloidal Cd(II) was highly dependent on the nZVI-SNPs heteroaggregation behavior. In the case of 40 mg/L nZVI with SNPs/nZVI mass ratios > 1, the formation of stable SNPs-nZVI heteroaggregates with hydrodynamic diameters (Dh) < 500 nm facilitated the nZVI and colloidal Cd(II) transport at their effluent mass recoveries of 34.76-37.82 % and 9.81-17.17 %, respectively. However, in the case of 100 mg/L nZVI with SNPs/nZVI mass ratios of 0.4-2, the interception of nZVI-SNPs heteroaggregates with Dh > 1500 nm by quartz sands led to almost complete retention of nZVI and colloidal Cd(II) in the columns. Combined with analytical results of zeta potentials and XRD spectrum, it was revealed that the Cd(II) ions could accelerate nZVI corrosion. The positively charged Fe3O4 and γ-FeOOH on corroded nZVI surface could facilitate the heteroaggregation of nZVI-SNPs by the patch-charge attraction, which further reduced the environmental risk of colloidal Cd(II) transport. These findings revealed the important effects of heteroaggregation between nZVI and SNPs on the transport risk of Cd(II) in groundwater.
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Affiliation(s)
- Wenpei Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Science, Beijing 100049, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Lu Han
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Xueyan Chen
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Science, Beijing 100049, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Wenying Zhang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Lei Yang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Hongping Chen
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Shaolin Hou
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
| | - Jing Li
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing Jinghongze Environmental Technology Co Ltd, Nanjing 210000, China
| | - Mengfang Chen
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
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2
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Ke Q, Ren J, Feng K, Zhang Z, Huang W, Xu X, Zhao L, Qiu H, Cao X. Crucial roles of soil inherent Fe-bearing minerals in enhanced Cr(VI) reduction by biochar: The electronegativity neutralization and electron transfer mediation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 350:124014. [PMID: 38642792 DOI: 10.1016/j.envpol.2024.124014] [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: 02/03/2024] [Revised: 04/16/2024] [Accepted: 04/17/2024] [Indexed: 04/22/2024]
Abstract
Biochar has been used for soil Cr(VI) remediation in the last decade due to its enriched redox functional groups and good electrochemical properties. However, the role of soil inherent Fe-bearing minerals during the reduction of Cr(VI) has been largely overlooked. In this study, biochar with different electron-donating capacities (EDCs) was produced at 400 °C (BC400) and 700 °C (BC700), and their performance for Cr(VI) reduction in soils with varied properties (e.g., Fe content) was investigated. The addition of BC400 caused around 14.2-36.0 mg g-1 Cr(VI) reduction after two weeks of incubation in red soil, paddy soil, loess soil, and fluvo-aquic soil, while a less Cr(VI) was reduced by BC700 (2.57-16.7 mg g-1) with smaller EDCs. The Cr(VI) reduction by both biochars in different soils was closely related to Fe content (R2 = 0.93-0.98), so red soil with the richest Fe (14.8% > 1.79-3.49%) showed the best reduction capability, and the removal of soil free Fe oxides (e.g., hematite) resulted in 71.9% decrease of Cr(VI) reduction by BC400. On one hand, Fe-bearing minerals could increase the soil acidity, neutralize the surface negative charge of biochar, enhance the contact between Cr(VI) and biochar, and thus facilitate the direct Cr(VI) reduction by biochar in soils. On the other hand, Fe-bearing minerals could also facilitate the indirect Cr(VI) reduction by mediating the electron from biochar to Cr(VI) with the cyclic transformation of Fe(II)/Fe(III). This study demonstrates the key role of soil Fe-bearing minerals in Cr(VI) reduction by biochar, which advances our understanding on the biochar-based remediation mechanism of Cr(VI)-contaminated soils.
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Affiliation(s)
- Qiang Ke
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jia Ren
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Kanghong Feng
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Zehong Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Wenfeng Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xiaoyun Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Ling Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Hao Qiu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xinde Cao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, Shanghai Jiao Tong University, Shanghai, 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
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Gu T, Niu W, Huo L, Zhou L, Jia Y, Li R, Wu Y, Zhong H. Molasses-based in situ bio-sequestration of Cr(VI) in groundwater under flow condition. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 344:123337. [PMID: 38266698 DOI: 10.1016/j.envpol.2024.123337] [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: 10/06/2023] [Revised: 01/08/2024] [Accepted: 01/08/2024] [Indexed: 01/26/2024]
Abstract
The in situ biosequestration of Cr(VI) in groundwater with molasses as the carbon source was studied based on column experiments and model simulation in this study. Compared with biological reduction, molasses-based chemical reduction did not cause significant Cr(VI) removal at molasses concentration as high as 1.14 g L-1. The molasses at a concentration as low as 0.57 g L-1 could support biofilm-based Cr(VI) sequestration under flow conditions and showed better sequestration performances than D-glucose and emulsified vegetable oil (8 g L-1). The existence of molasses (1.14 g L-1) decreased the pH of the effluent from 7.5 to 6.3 and the oxidation-reduction potential from 275 mV to 220 mV in the groundwater, which was responsible for reduction and thus the sequestration of Cr(VI). Advection-dispersion-reaction model well described the process of the Cr(VI) transport with biosequestration in the column (R2 ≥ 0.96). Owing to the Cr(VI) toxicity to the biofilms, the removal ratio decreased by 24% with a rise of Cr(VI) concentration from 8.6 to 43 mg L-1. The prolongation of hydraulic retention time could promote the performance of Cr(VI) biosequestration. The chemical form of Cr deposited as the product of bio-reduction was confirmed as Cr(OH)3·H2O and other complexes of Cr(III). Our work demonstrated the efficacy of molasses for in situ sequestration of Cr(VI) under the dynamic flow condition and provide some useful information for Cr-contaminated groundwater remediation.
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Affiliation(s)
- Tianyuan Gu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Wenjing Niu
- Environmental Science and Technology Information Service Center, Zhoukou 466000, China
| | - Lili Huo
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Lian Zhou
- Ningbo Institute of Digital Twin, Eastern Institute of Technology, Ningbo 315200, China
| | - Yufei Jia
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Rongfu Li
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330012, China
| | - Yongming Wu
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330012, China
| | - Hua Zhong
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; Ningbo Institute of Digital Twin, Eastern Institute of Technology, Ningbo 315200, China.
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Zhang W, Guo X, Jiang M. Influence of humic acid and bovine serum albumin on colloid-associated heavy metal transport in saturated porous media. ENVIRONMENTAL TECHNOLOGY 2023; 44:3965-3974. [PMID: 35546295 DOI: 10.1080/09593330.2022.2077135] [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: 02/15/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
Colloid-facilitated contaminant transport in porous media has been widely observed in laboratory and field studies. In this study, the influence of two dissolved organic matters (DOMs), humic acid (HA) and bovine serum albumin (BSA), on the colloid-associated heavy metal transport, was investigated. Soil colloids with particle sizes <2 μm were prepared from bentonite. Glass bead was used as porous media for the column tests. The influence of DOM on the adsorption of Pb2+ and Cu2+ onto colloids was tested. Colloid mobility and colloid-metal co-transport in the presence/absence of DOMs were investigated by breakthrough tests. The test results showed that DOMs facilitated colloid mobility. The measured ζ-potentials showed that DOMs enhanced the electrostatic repulsion between colloids and glass beads and reduced colloid deposition. These findings were further confirmed by calculating the interaction energy using the DLVO theory. Batch tests showed the strong adsorption of Pb2+ and Cu2+ on the colloid, and the adsorption was enhanced by DOMs. The colloid-metal co-transport tests showed that colloids can significantly facilitate the transport of Pb2+ and Cu2+ and that the facilitation was further enhanced by DOMs. By heavy metals, the colloid mobility was retarded, mainly due to the increased deposition. The transport of Cu2+ facilitated by DOM was more obvious than that of Pb2+. Compared to BSA, the effect of HA on enhancing colloid mobility, increasing colloid adsorption to heavy metals, and hence on the facilitation of colloid-associated heavy metals transport was more prominent.
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Affiliation(s)
- Wenjie Zhang
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
| | - Xingzhang Guo
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
| | - Mohan Jiang
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
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5
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Gu X, Mo H, Wang L, Zhang L, Ding Z. Co-transport of Cr(VI) and Bentonite Colloid in Saturated Porous Media. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 110:30. [PMID: 36580113 DOI: 10.1007/s00128-022-03675-4] [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: 03/31/2022] [Accepted: 09/28/2022] [Indexed: 06/17/2023]
Abstract
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16-18 mesh and 40-60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min-1. Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%-21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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Affiliation(s)
- Xinfeng Gu
- School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu Southern Road, Nanjing, 211816, People's Republic of China
| | - Huijing Mo
- School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu Southern Road, Nanjing, 211816, People's Republic of China
| | - Lei Wang
- School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu Southern Road, Nanjing, 211816, People's Republic of China
| | - Lianyi Zhang
- School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu Southern Road, Nanjing, 211816, People's Republic of China
| | - Zhuhong Ding
- School of Environmental Science and Engineering, Nanjing Tech University, 30 Puzhu Southern Road, Nanjing, 211816, People's Republic of China.
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El-Naggar A, Mosa A, Ahmed N, Niazi NK, Yousaf B, Sarkar B, Rinklebe J, Cai Y, Chang SX. Modified and pristine biochars for remediation of chromium contamination in soil and aquatic systems. CHEMOSPHERE 2022; 303:134942. [PMID: 35577128 DOI: 10.1016/j.chemosphere.2022.134942] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/04/2022] [Accepted: 05/08/2022] [Indexed: 06/15/2023]
Abstract
Chromium (Cr) contamination in soil and water poses high toxicity risks to organisms and threatens food and water security worldwide. Biochar has emerged as a promising material for cleaning up Cr contamination owing to biochar's strong capacity to immobilize Cr. This paper synthesizes information on biochar modification for the efficient remediation of Cr contamination in soil and water, and critically reviews mechanisms of Cr adsorption on pristine and modified biochars. Biochar modification methods include physical activation via ball milling or ultraviolet irradiation, chemical activation via magnetization, alkali/acid treatment, nano-fabrication or loading of reductive agents, and biological activation via integrating biochars with microorganisms and their metabolites. Modified biochars often have multi-fold enhancement in Cr adsorption/reduction capacity than pristine biochars. Iron (Fe)-supported magnetic biochars have the most promising Cr removal abilities with high reusability of the biochars. Pre-pyrolysis modification with Fe could load Fe3O4 micro-/nanoparticles on biochars, and increase the surface area and electrostatic attraction between chromate anions and biochar surfaces, and reduce Cr(VI) to Cr(III). Post-pyrolysis modification could enrich oxygen-containing functional groups such as CO and -OH on biochar surfaces and promote Cr reduction and adsorption. Future research directions for Cr mitigation using advanced biochar products are discussed in this review.
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Affiliation(s)
- Ali El-Naggar
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China; Department of Soil Sciences, Faculty of Agriculture, Ain Shams University, Cairo, 11241, Egypt; Department of Renewable Resources, University of Alberta, Edmonton, Alberta, T6G 2H1, Canada
| | - Ahmed Mosa
- Soils Department, Faculty of Agriculture, Mansoura University, Mansoura, 35516, Egypt
| | - Naveed Ahmed
- U.S. Pakistan Center for Advanced Studies in Water, Mehran University of Engineering and Technology, Jamshoro, 76062, Sindh, Pakistan
| | - Nabeel Khan Niazi
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan
| | - Balal Yousaf
- CAS-Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, PR China; Department of Environmental Engineering, Middle East Technical University, Ankara, 06800, Turkey
| | - Binoy Sarkar
- Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water and Waste Management, Laboratory of Soil and Groundwater Management, Pauluskirchstraße 7, 42285, Wuppertal, Germany; International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University, Solan, 173212, Himachal Pradesh, India
| | - Yanjiang Cai
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China
| | - Scott X Chang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China; Department of Renewable Resources, University of Alberta, Edmonton, Alberta, T6G 2H1, Canada.
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Wang Y, Jiang Q, Yang Y, Cheng J, Bao C, Pan Y, Liu Y, Yang G, Leng Y, Tuo X. Adsorption Properties of Cs(I) and Co(II) on GMZ Bentonite Colloids. NUCL TECHNOL 2022. [DOI: 10.1080/00295450.2022.2083749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Yanhui Wang
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
| | - Qiao Jiang
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
| | - Yexin Yang
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
| | - Jianfeng Cheng
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
| | - Chenyang Bao
- Southwest University of Science and Technology, School of National Defense Science and Technology, Mianyang 621000, Sichuan, China
| | - Yuelong Pan
- China Nuclear Power Engineering Co Ltd, Shenzhen 518124, Guandong, China
| | - Yu Liu
- China Nuclear Power Engineering Co Ltd, Shenzhen 518124, Guandong, China
| | - Gang Yang
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
| | - Yangchun Leng
- Southwest University of Science and Technology, School of National Defense Science and Technology, Mianyang 621000, Sichuan, China
| | - Xianguo Tuo
- Chengdu University of Technology, Nuclear Technology Automation Process Academy, Chengdu 610059, Sichuan, China
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Xu Z, Pan D, Tang Q, Wei X, Liu C, Li X, Chen X, Wu W. Co-transport and co-release of Eu(III) with bentonite colloids in saturated porous sand columns: Controlling factors and governing mechanisms. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 298:118842. [PMID: 35031401 DOI: 10.1016/j.envpol.2022.118842] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/21/2021] [Accepted: 01/09/2022] [Indexed: 06/14/2023]
Abstract
Accurate prediction of the colloid-driven transport of radionuclides in porous media is critical for the long-term safety assessment of radioactive waste disposal repository. However, the co-transport and corelease process of radionuclides with colloids have not been well documented, the intrinsic mechanisms for colloids-driven retention/transport of radionuclides are still pending for further discussion. Thus the controlling factors and governing mechanisms of co-transport and co-release behavior of Eu(III) with bentonite colloids (BC) were discussed and quantified by combining laboratory-scale column experiments, colloid filtration theory and advection dispersion equation model. The results showed that the role of colloids in facilitating or retarding the Eu(III) transport in porous media varied with cations concentration, pH, and humic acid (HA). The transport of Eu(III) was facilitated by the dispersed colloids under the low ionic strength and high pH conditions, while was impeded by the aggregated colloids cluster. The enhancement of Eu(III) transport was not monotonically risen with the increase of colloids concentration, the most optimized colloids concentration in facilitating Eu(III) transport was approximately 150 mg L-1. HA showed significant promotion on both Eu(III) and colloid transport because of not only its strong Eu(III) complexion ability but also the increased dispersion of HA-coated colloid particles. The HA and BC displayed a synergistic effect on Eu(III) transport, the co-transport occurred by forming the ternary BC-HA-Eu(III) hybrid. The transport patterns could be simulated well with a two-site model that used the advection dispersion equation by reflecting the blocking effect. The retarded Eu(III) on the stationary phase was released and remobilized by the introduction of colloids, or by a transient reduction in cation concentration. The findings are essential for predicting the geological fate and the migration risk of radionuclides in the repository environment.
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Affiliation(s)
- Zhen Xu
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Duoqiang Pan
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.
| | - Qingfeng Tang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoyan Wei
- 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
| | - Xiaolong Li
- China Academy of Engineering Physics, Mianyang, 621000, China
| | - Ximeng Chen
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Wangsuo Wu
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
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Yang C, Offiong NA, Zhang C, Liu F, Zhang W, Dong J. Density-regulated remediation of dense non-aqueous phase liquids using colloidal biliquid aphrons (CBLA): Force model of transport and distribution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 807:151057. [PMID: 34710427 DOI: 10.1016/j.scitotenv.2021.151057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/01/2021] [Accepted: 10/14/2021] [Indexed: 06/13/2023]
Abstract
Using colloidal biliquid aphrons (CBLAs) for density control has been proved to a promising technology in dense non-aqueous phase liquids (DNAPLs) contaminated aquifer remediation. However, the transport and distribution of CBLAs in aquifer is an urgent issue for actual application in groundwater. Especially considering the fact that CBLAs have a lower density than water. In this work, the role of buoyancy force on CBLA transport in water-saturated sandbox was investigated, and the force model of CBLA in pore space was developed. Furthermore, the density regulation of trichloroethylene (TCE) in sandbox was studied using CBLA. We found that buoyancy plays a significant role compared with other interaction forces in the transport of CBLA, and the sine of the rising angle of CBLA has a significant correlation with the force on CBLA. CBLA at 5 times the volume of TCE displaced the TCE at the bottom of the tank by upward mobility and the maximum concentration dramatically decreased to 31.23 mg/L. These results can be used for predicting the transport of CBLA (as well as other remediation reagents that are less dense than water) in aquifer and are beneficial to the subsequent remediation application of CBLA in actual contaminated sites.
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Affiliation(s)
- Chaoge Yang
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China
| | - Nnanake-Abasi Offiong
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China
| | - Chunpeng Zhang
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China
| | - Fangyuan Liu
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China
| | - Weihong Zhang
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China.
| | - Jun Dong
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, 2519 Jiefang Road, Changchun, Jilin 130021, China.
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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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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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