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Li S, Feng D, Liu J, Liu Q, Tang J. Surfactant-enhanced reduction of soil-adsorbed nitrobenzene by carbon-coated nZVI: Enhanced desorption and mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 856:159186. [PMID: 36202351 DOI: 10.1016/j.scitotenv.2022.159186] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/12/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
The reduction process of pollutants by nano zero-valent iron (nZVI) is limited by mass transfer and its effective utilization, and previous studies have ignored the electron loss caused by its oxidative passivation. The carbon-coated structure can effectively inhibit the oxidation of nZVI, but the effectiveness of carbon-coated nZVI (Fe0@C) as a reducing agent in soil remediation is unclear. Therefore, in this study, the Fe0@C/surfactant system was used to remove soil-adsorbed nitrobenzene (NB) to simultaneously enhance the mass transfer process and effective utilization of nZVI. The results showed that the use of surfactants effectively promoted the desorption of NB adsorbed by the soil, and the desorption process was affected by factors such as the type and concentration of surfactants, water-soil ratio, and soil organic matter (SOM) content. The enhanced desorption of NB by the surfactant in the soil system promoted the effective contact between the composite and NB, thereby enhancing the reduction of NB by the composite. In addition, Fe0@C exhibited excellent performance for the reduction of soil-adsorbed NB compared with the conventional nZVI, and this advantage was more obvious in the potting soil system. However, the composite will be gradually passivated due to the alkaline environment during the reduction process, and this phenomenon was especially obvious in the campus soil system. When the pH value decreased from 9 to 3, the proportion of aniline (AN) generated in the campus soil system increased from 19.37 % to 69.29 %. In addition, in potting soil systems with high SOM content, the adsorption of soil particles to the composite and the high dissolved organic matter (DOM) content resulting from the high SOM content also negatively affected the reduction process. The conclusions of this study demonstrate the great potential of the Fe0@C/surfactant system for in-situ contaminated site remediation applications.
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Affiliation(s)
- Song Li
- College of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, Jiangsu, China; Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Di Feng
- Shandong Facility Horticulture Bioengineering Research Center/Weifang University of Science and Technology, Weifang 262700, Shandong, China
| | - Juncheng Liu
- Tianjin Huakan Environmental Protection Technology Co., Ltd, Tianjin 300170, China
| | - Qinglong Liu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingchun Tang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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Li S, Li S, Wen N, Wei D, Zhang Y. Highly effective removal of lead and cadmium ions from wastewater by bifunctional magnetic mesoporous silica. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118341] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Lu H, Dong J, Xi B, Cai P, Xia T, Zhang M. Transport and retention of porous silicon-coated zero-valent iron in saturated porous media. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 276:116700. [PMID: 33621736 DOI: 10.1016/j.envpol.2021.116700] [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: 10/27/2020] [Revised: 01/26/2021] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
Porous silicon-coated zero-valent iron (Fe0@p-SiO2) is a promising material for in-situ contaminated groundwater remediation. However, investigations of factors that affect the transport of Fe0@p-SiO2 remain incomplete. In the present study, Fe0@p-SiO2 composites were prepared by a SiO2-coated technology, and a series of column experiments were conducted to examine the effects of media size, ionic strength, and injection velocity and concentration on retention and transport in saturated porous media. Results showed that the obtained Fe0@p-SiO2 is a core-shell composite with zero-valent iron as the core and porous silicon as the shell. Media size, injection velocity, Fe0 concentration, and ionic strength had a significant impact on the transport of Fe0@p-SiO2. Fe0@p-SiO2 effluent concentrations decreased with a smaller media size. Increasing initial particle concentration and ionic strength led to a decrease in particle transport. High particle retention was observed near the middle of the column, especially with high injection concentration. That was also observable in the condition of lower injection velocity or finer media. The results indicated that two transport behaviors during particles transport, which were "agglomeration-straining" and "detachment-re-migration". Moreover, the dominated mechanisms for Fe0@p-SiO2 transport and retention in saturated porous media are hydrodynamic dispersion and interception. Given the results, in practical engineering applications, proper injection velocity and concentration should be selected depending on the pollution status of groundwater and the geochemical environment to ensure an effective in-situ reaction zone.
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Affiliation(s)
- Haojie Lu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Jun Dong
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China.
| | - Beidou Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Peiyao Cai
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
| | - Tian Xia
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
| | - Mengyue Zhang
- Key Lab of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun, 130026, PR China
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Madan S, Thapa U, Tiwari S, Tiwari SK, Jakka SK, Soares MJ. Designing of a nanoscale zerovalent iron@fly ash composite as efficient and sustainable adsorbents for hexavalent chromium (Cr(VI)) from water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:22474-22487. [PMID: 33415643 DOI: 10.1007/s11356-020-11692-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
The present study encompasses a unique concept involving the formation of core-shell particles with surface-activated fly ash (FA) as core and nanoscale zerovalent iron (nZVI) particles as shell, which not only imparts high adsorption efficiency for Cr(VI) but also contributes to fruitful utilization of FA while overcoming the drawbacks associated with ZVI nanoparticles (aggregation, rapid oxidation and less durability). The otherwise inert surface of FA has been modified and activated to achieve a uniform and stable layer of nZVI over FA. The functionalized particles were studied using FE-SEM/EDAX, HR-TEM, XRD and FT-IR studies for its physical, functional and morphological characteristics. The results indicate the strong adsorption ability of nZVI@FA particles, with 100% removal efficiency within 10 min at low initial concentrations of Cr(VI), which is appreciably higher than that of pure fly ash (26%) after 60 min of reaction. Besides, the so-formed structure of composite aids to improve its life, as the synthesized nZVI@FA particles could be efficiently regenerated and reused up to 5 subsequent adsorption-desorption cycles, which is in contrast with the ability of fly ash considering its low desorption potential. Hence, the composite material proves to be an effective and sustainable alternative for treatment of a waste using a waste.
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Affiliation(s)
- Shubhangi Madan
- Amity Institute of Applied Sciences, Amity University, Noida, 201303, India
| | - Urvashi Thapa
- Amity Institute of Applied Sciences, Amity University, Noida, 201303, India
| | - Sangeeta Tiwari
- Amity Institute of Applied Sciences, Amity University, Noida, 201303, India.
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Shi B, Gao S, Yu H, Zhang L, Song C, Huang K. Fe0 nanoparticles encapsulated in hollow porous nanosphere frameworks for efficient degradation of methyl orange. REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104614] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Liu S, Gao H, Cheng R, Wang Y, Ma X, Peng C, Xie Z. Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron. Sci Rep 2020; 10:8831. [PMID: 32483261 PMCID: PMC7264320 DOI: 10.1038/s41598-020-65814-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 05/07/2020] [Indexed: 11/09/2022] Open
Abstract
In order to clarify the mechanism and effect of bentonite-supported nanoscale zero-valent iron (nZVI@Bent) on Cr(VI) removal in soil suspended liquid, nZVI@Bent was prepared by liquid-phase reduction method in this research. A number of factors, including the mass ratio of Fe2+ to bentonite during preparation of nZVI@Bent, nZVI@Bent dosage, soil suspended liquid pH value and reaction temperature were assessed to determine their impact on the reduction of Cr(VI) in soil suspended liquid. The nZVI@Bent was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyze the mechanism of removal of Cr(VI) from the soil. The results showed that the temperature of soil suspended liquid had a significant effect on the removal efficiency. Calculated by the Arrhenius formula, nZVI@Bent removes Cr(VI) from the soil suspended liquid as an endothermic reaction with a reaction activation energy of 47.02 kJ/mol, showed that the reaction occurred easily. The removal of mechanism Cr(VI) from the soil by nZVI@Bent included adsorption and reduction, moreover, the reduction process can be divided into direct reduction and indirect reduction. According to XPS spectrogram analysis, the content of Cr(III) in the reaction product was 2.1 times of Cr(VI), indicated that the reduction effect was greater than the adsorption effect in the process of Cr(VI) removal. The experiment proved that nZVI@Bent can effectively remove Cr(VI) from soil suspension, and can provide technical support for repairing Cr(VI)-polluted paddy fields.
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Affiliation(s)
- Shichao Liu
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Hongjun Gao
- Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, 130033, China
| | - Rui Cheng
- Key Laboratory of Aquatic Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yujun Wang
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China.
| | - Xiulan Ma
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Chang Peng
- Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun, 130033, China
| | - Zhonglei Xie
- College of Plant Science, Jilin University, Changchun, 130062, China. .,College of Construction Engineering, Changchun Sci-Tech University, Changchun, 130600, China.
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Pd nanoparticle incorporated mesoporous silicas with excellent catalytic activity and dual responsivity. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124074] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Zhang M, Dong Y, Gao S, Cai P, Dong J. Effective stabilization and distribution of emulsified nanoscale zero-valent iron by xanthan for enhanced nitrobenzene removal. CHEMOSPHERE 2019; 223:375-382. [PMID: 30784744 DOI: 10.1016/j.chemosphere.2019.02.099] [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: 08/23/2018] [Revised: 02/12/2019] [Accepted: 02/15/2019] [Indexed: 06/09/2023]
Abstract
The reactivity and delivery of remediants and treatment of organic contaminants in heterogeneous aquifer are particularly challenging issues for injection-based remedial treatments. Our objective was to enhance the reactivity and delivery of nanoscale zero-valent iron (nZVI) and improve the sweeping efficiency of nZVI into low permeable zones (LPZs) to reduce nitrobenzene (NB). This was accomplished by conducting batch and transport experiments that quantified NB degradation by different modified nZVI and the ability of emulsified nZVI (EZVI) or xanthan carried EZVI (XG-EZVI) to penetrate and cover a lens. By incorporating the xanthan and emulsified oil with nZVI, it possessed higher stability and stronger reactivity to reduce NB. Results showed that the stability of EZVI was improved by xanthan, and there were no adverse effects on NB removal in use of XG-EZVI at limited xanthan addition of ≦100 mg L-1. By the injection of XG-EZVI in 2D-tank experiments, the degradation of NB was 8 times that of EZVI added, while NB adsorption on media was only 1/50 of initial NB. 1205 mg of NB totally entered into the tank, the quality of aniline in effluent was approximately 90.0 mg in addition of XG-EZVI at 40 h, but not detected in presence of EZVI. The greater NB reduction by XG-EZVI resulted from higher sweeping efficiency in LPZ. These observations support the couple use of xanthan and emulsified oil for modifying nZVI as a means of achieving greater stability and reactivity and enhancing nZVI delivery into LPZs for the treatment of NB.
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Affiliation(s)
- Mengyue Zhang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China
| | - Yang Dong
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China
| | - Song Gao
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China
| | - Peiyao Cai
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China
| | - Jun Dong
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China.
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Wang Q, Luo W, Chen X, Fan J, Jiang W, Wang L, Jiang W, Zhang W, Yang J. Porous‐Carbon‐Confined Formation of Monodisperse Iron Nanoparticle Yolks toward Versatile Nanoreactors for Metal Extraction. Chemistry 2018; 24:15663-15668. [DOI: 10.1002/chem.201803433] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Qingqing Wang
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
| | - Wei Luo
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
| | - Xinqi Chen
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
- School of Physics and Mechanical & Electrical Engineering Hubei University of Education Wuhan 430205 P. R. China
| | - Jianwei Fan
- College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China
| | - Weizhong Jiang
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
| | - Lianjun Wang
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
| | - Wan Jiang
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
- School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 P. R. China
| | - Wei‐xian Zhang
- College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China
| | - Jianping Yang
- State Key Laboratory for Modification of Chemical Fibers, and Polymer Materials College of Materials Science and Engineering Institute of Functional Materials Donghua University Shanghai 201620 P. R. China
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