101
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Uwayezu JN, Yeung LWY, Bäckström M. Sorption of PFOS isomers on goethite as a function of pH, dissolved organic matter (humic and fulvic acid) and sulfate. CHEMOSPHERE 2019; 233:896-904. [PMID: 31340417 DOI: 10.1016/j.chemosphere.2019.05.252] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Revised: 05/24/2019] [Accepted: 05/27/2019] [Indexed: 06/10/2023]
Abstract
Understanding the distribution of PFOS isomers between the aqueous phase and goethite is crucial, since it is an abundant sorbent and thus may have a large influence on the mobility of PFOS. This study was conducted to understand the effects of pH, humic acid (HA), fulvic acid (FA) and sulfate on sorption of PFOS isomers. The results will increase the understanding about what parameters may control the fate and transport of PFOS in surface and ground water. The study was conducted by adding PFOS spiked water to a goethite slurry with different aqueous chemistry. Levels of total PFOS and PFOS isomers were quantified using an Ultra-Performance Liquid Chromatograph coupled to a triple quadrupole mass spectrometer. Results showed that sorption of PFOS was mainly dependent on pH; sorption decreased as pH increased. Presence of HA increased log Kd from 1.29 to 2.03, 1.76 to 1.92 and 1.51 to 1.96 at pH 5.50-7.50 for 3-/4-/4-PFOS, 6-/2-PFOS and L-PFOS, respectively. Changes in the aqueous chemistry also affected the behaviour of PFOS as the addition of Na2SO4 enhanced the sorption of PFOS. Results showed that L-PFOS was more readily sorbed to goethite at pH < 4.35 both in the presence and in the absence of humic or fulvic acids. At pH > 4.5 the 3-/4-/5-PFOS isomer group was more associated to goethite. Besides electrostatic interactions, which controlled the sorption of PFOS, this study indicate that the presence of dissolved humic substances in the aqueous phase enhances the sorption via hydrophobic mechanisms.
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Affiliation(s)
- Jean-Noel Uwayezu
- Man-Technology-Environment Research Centre (MTM), Örebro University, 701 82, Örebro, Sweden
| | - Leo W Y Yeung
- Man-Technology-Environment Research Centre (MTM), Örebro University, 701 82, Örebro, Sweden
| | - Mattias Bäckström
- Man-Technology-Environment Research Centre (MTM), Örebro University, 701 82, Örebro, Sweden.
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102
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Wang W, Mi X, Shi H, Zhang X, Zhou Z, Li C, Zhu D. Adsorption behaviour and mechanism of the PFOS substitute OBS (sodium p-perfluorous nonenoxybenzene sulfonate) on activated carbon. ROYAL SOCIETY OPEN SCIENCE 2019; 6:191069. [PMID: 31598323 PMCID: PMC6774934 DOI: 10.1098/rsos.191069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/14/2019] [Indexed: 05/24/2023]
Abstract
Perfluorooctane sulfonate (PFOS) was listed as a persistent organic pollutant by the Stockholm Convention. As a typical alternative to PFOS, sodium p-perfluorous nonenoxybenzene sulfonate (OBS) has recently been detected in the aquatic environment which has caused great concern. For the first time, the adsorption behaviour and mechanism of OBS on activated carbon (AC) with different physical and chemical properties were investigated. Decreasing the particle size of AC can accelerate its adsorption for OBS, while AC with too small particle size was not conducive to its adsorption capacity due to the destruction of its pore structure during the mechanical crushing process. Intra-particle diffusion had a lesser effect on the adsorption rate of AC with smaller particle size, higher hydrophilicity and larger pore size. Reactivation of AC by KOH can greatly enlarge their pore size and surface area, greatly increasing their adsorption capacities. The adsorption capacity of two kinds of R-GAC exceeded 0.35 mmol g-1, significantly higher than that of other ACs. However, increasing the hydrophilicity of AC would decrease their adsorption capacities. Further investigation indicated that a larger pore size and smaller particle size can greatly enhance the adsorptive removal of OBS on AC in systems with other coexisting PFASs and organic matter due to the reduction of the pore-blocking effect. The spent AC can be successfully regenerated by methanol, and it can be partly regenerated by hot water and NaOH solution. The percentage of regeneration for the spent AC was 70.4% with 90°C water temperature and up to 95% when 5% NaOH was added into the regeneration solution. These findings are very important for developing efficient adsorbents for the removal of these newly emerging PFASs from wastewater and understanding their interfacial behaviour.
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Affiliation(s)
- Wei Wang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Xin Mi
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
- Eco-environmental engineering college, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Huilan Shi
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
- Eco-environmental engineering college, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Xue Zhang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
- Eco-environmental engineering college, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Ziming Zhou
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
- Eco-environmental engineering college, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Chunli Li
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
| | - Donghai Zhu
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, People's Republic of China
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103
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Jian JM, Zhang C, Wang F, Lu X, Wang F, Zeng EY. Effect of solution chemistry and aggregation on adsorption of perfluorooctanesulphonate (PFOS) to nano-sized alumina. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 251:425-433. [PMID: 31103002 DOI: 10.1016/j.envpol.2019.05.025] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 04/15/2019] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
The interaction of pollutants with nanomaterials has attracted attention due to the extensive application of nanomaterials. In this study, the adsorption behavior of PFOS on nano-alumina with different shapes was investigated. First, the adsorption isotherms and kinetics of PFOS on alumina nanoparticles (NPs) and nanowires (NWs) were measured to calculate thermodynamic parameters. The effects of solution chemistry (e.g., pH, ionic strength, and the presence of humic acid) on adsorption were further studied. The different aggregation behavior of alumina NPs and NWs were the critical factor for PFOS adsorption, as demonstrated through dynamic light scattering (DLS) experiments. This study is the first to investigate the aggregation effects on PFOS adsorption on nanomaterials and the results should be useful in identifying the important roles of shape and aggregation of nanomaterials on the fate of organic pollutants in the environment.
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Affiliation(s)
- Jun-Meng Jian
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Chi Zhang
- Department of Geology, The University of Kansas, 304 Lindley Hall, 1475 Jayhawk Blvd., Lawrence, KS 66045-7575, USA
| | - Fen Wang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Xingwen Lu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Fei Wang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
| | - Eddy Y Zeng
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
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104
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Meng P, Fang X, Maimaiti A, Yu G, Deng S. Efficient removal of perfluorinated compounds from water using a regenerable magnetic activated carbon. CHEMOSPHERE 2019; 224:187-194. [PMID: 30825849 DOI: 10.1016/j.chemosphere.2019.02.132] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/19/2019] [Accepted: 02/21/2019] [Indexed: 05/08/2023]
Abstract
Adsorption by powder activated carbon (PAC) is recognized as an efficient method for the removal of perfluorinated compounds (PFCs) in water, while the poor separation of spent PAC makes it difficult for further regeneration, increasing the treatment cost significantly. In this study, an ultrafine magnetic activated carbon (MAC) consisting of Fe3O4 and PAC was prepared by ball milling to remove PFCs from water efficiently. Increasing the percentage of Fe3O4 and balling milling time decreased its adsorption capacity for perfluoroctane sulfonate (PFOS), whereas increased the magnetic separation property to some degree. The optimized MAC was prepared with a Fe3O4 to PAC mass ratio of 1:3 after ball milling for 2 h, and the adsorption equilibriums of all the four PFCs on the optimal MAC were reached within less than 2 h, with the adsorption capacities of 1.63, 0.90, 0.33 and 0.21 mmol/g for PFOS, perfluorooctanoic acid (PFOA), perfluorohexane sulfonate (PFHxS) and perfluorobutane sulfonate (PFBS), respectively. Increasing the solution pH hindered the adsorption of PFOS significantly when the pH was less than the zero potential point (around 6) of the MAC, due to the decreased electrostatic attraction. The spent MAC could be easily separated with a magnet and regenerated by a small volume of methanol, and the regenerated MAC could be reused for more than 5 time and remain stable adsorption capacity for PFOS after 3 cycles. This study provides useful insights into the removal of PFCs by separable magnetic PAC in wastewater.
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Affiliation(s)
- Pingping Meng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xiaolu Fang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Ayiguli Maimaiti
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Shubo Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China.
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105
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Crone BC, Speth TF, Wahman DG, Smith SJ, Abulikemu G, Kleiner EJ, Pressman JG. Occurrence of Per- and Polyfluoroalkyl Substances (PFAS) in Source Water and Their Treatment in Drinking Water. CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY 2019; 49:2359-2396. [PMID: 32831535 PMCID: PMC7433796 DOI: 10.1080/10643389.2019.1614848] [Citation(s) in RCA: 110] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Per-and polyfluoroalkyl substances (PFAS) occurrence in drinking water and treatment methods for their removal are reviewed. PFAS are fluorinated substances whose unique properties make them effective surface-active agents with uses ranging from stain repellants to fire-fighting foams. In response to concerns about drinking water contamination and health risks from PFAS exposure, the United States Environmental Protection Agency published Health Advisories (HAs) for perfluorooctanoic acid and perfluorooctane sulfonic acid. The occurrence of six PFAS in drinking water has been reported in the Third Unregulated Contaminant Monitoring Rule (UCMR3), and subsequent analysis of the dataset suggested that four percent of water systems reported at least one detectable PFAS compound and 1.3 percent of water systems reported results above the HAs. Many treatment technologies have been evaluated in the literature, with the most promising and readily applied treatment technologies being activated carbon, anion exchange resins, and high-pressure membrane systems. From these data and literature reports, research and data gaps were identified and suggestions for future research are provided.
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Affiliation(s)
- Brian C. Crone
- National Risk Management Research Laboratory, U.S. Environmental Protection Agency Cincinnati, OH 45268
| | - Thomas F. Speth
- National Risk Management Research Laboratory, U.S. Environmental Protection Agency Cincinnati, OH 45268
| | - David G. Wahman
- National Risk Management Research Laboratory, U.S. Environmental Protection Agency Cincinnati, OH 45268
| | | | | | - Eric J. Kleiner
- National Risk Management Research Laboratory, U.S. Environmental Protection Agency Cincinnati, OH 45268
| | - Jonathan G. Pressman
- National Risk Management Research Laboratory, U.S. Environmental Protection Agency Cincinnati, OH 45268
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106
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Zhang Y, Zhu C, Liu F, Yuan Y, Wu H, Li A. Effects of ionic strength on removal of toxic pollutants from aqueous media with multifarious adsorbents: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 646:265-279. [PMID: 30055489 DOI: 10.1016/j.scitotenv.2018.07.279] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 07/19/2018] [Accepted: 07/19/2018] [Indexed: 05/12/2023]
Abstract
Adsorption is one of the most widely used and effective wastewater treatment methods. The role of ionic strength (IS) in shaping the adsorption performances is much necessary due to the ubiquity of electrolyte ions in water body and industrial effluents. The influences of IS on adsorption are rather complex, because electrolyte ions affect both adsorption kinetics and thermodynamics by changing the basic characteristics of adsorbents and adsorbates. For a given adsorption system, multiple or even contradictory effects of IS may coexist under identical experimental conditions, rendering the dominant mechanism recognition and net effect prediction complicated. We herein reviewed the key advancement on the interaction and mechanisms of IS, including change in number of active sites for adsorbents, ion pair for metal ions, molecular aggregation and salting-out effect for organic compounds, site competition for both inorganic and organic adsorbates, and charge compensation for adsorbent-adsorbate reciprocal interactions. The corresponding fundamental theory was thoroughly described, and the efforts made by various researchers were explicated. The structural optimization of adsorbents affected by IS was detailed, also highlighting polyamine materials with exciting "salt-promotion" effects on heavy metal removal from high salinity wastewater. In addition, the research trends and prospects were briefly discussed.
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Affiliation(s)
- Yanhong Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Changqing Zhu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Fuqiang Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal Resource Reuse, Nanjing 210023, PR China.
| | - Yuan Yuan
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Haide Wu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal Resource Reuse, Nanjing 210023, PR China
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107
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Wu T, Wu Z, Ma D, Xiang W, Zhang J, Liu H, Deng Y, Tan S, Cai X. Fabrication of Few-Layered Porous Graphite for Removing Fluorosurfactant from Aqueous Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15181-15188. [PMID: 30398350 DOI: 10.1021/acs.langmuir.8b03030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Due to the persistence, toxicity, and widespread occurrence of fluorosurfactants in the blood of general population, it is very important to develop recyclable and highly effective adsorbent material for their removal from aqueous solution. Herein, a new type of few-layered porous graphite (FPG) was fabricated as an adsorbent, and the adsorption characteristics of FPG toward potassium perfluorobutane sulfonate (PFBS), potassium perfluorohexane sulfonate (PFHxS), and potassium perfluorooctane sulfonate (PFOS) in environmental cleanup were evaluated under laboratory condition. The results indicated that the as-prepared FPG had sorption capacities of 1.22, 1.52, and 2.48 mmol g-1 for PFBS, PFHxS, and PFOS, respectively, which were the highest adsorption values of PFHxS, PFBS, and PFOS on different kinds of today's carbon materials. The efficiency of FPG remained almost constant during the first five cycles of the adsorption-desorption process after heating. The outstanding adsorption performance of FPG was attributed to its unique physical properties, such as high porosity, high hydrophobicity, low density, and excellent heat stability. The findings presented herein indicated that FPG could serve as a promising adsorbent for the removal of fluorosurfactant in waste water.
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Affiliation(s)
| | | | | | - Weibing Xiang
- Guangdong Gaoming Industrial Innovation Research Institute , Foshan 528500 , P. R. China
| | | | | | | | | | - Xiang Cai
- Guangdong Gaoming Industrial Innovation Research Institute , Foshan 528500 , P. R. China
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108
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Mo J, Yang Q, Zhang N, Zhang W, Zheng Y, Zhang Z. A review on agro-industrial waste (AIW) derived adsorbents for water and wastewater treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 227:395-405. [PMID: 30212686 DOI: 10.1016/j.jenvman.2018.08.069] [Citation(s) in RCA: 126] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 07/20/2018] [Accepted: 08/15/2018] [Indexed: 05/10/2023]
Abstract
There is a large amount of studies surrounding the usage of agro-industrial waste (AIW) for the adsorptions of organic pollutants (dyes) and inorganic pollutants (heavy metals) in water/wastewater. This method is normally treated as an alternative approach to the conventional water/wastewater treatment. However, there are some increasing interests for investigators to identify novel adsorption materials for pollutants removal. It is particularly noteworthy that most AIW wastes are not currently used at the original state, but modified in a variety of ways to reinforce the porosity and adsorption surface area of the material. Nanostructuring, activation, carbonization, and grafting are some common modification technologies of agricultural waste adsorbents. Besides, the characteristic, preparation and application of adsorbents from various industrial wastes, including natural materials and biosorbents, were summarized. Additionally, the challenges and perspectives for future researches of waste-derived adsorbents were studied. This review provides an important insight on using AIWs as precursor materials for preparing adsorbents in water/wastewater treatment.
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Affiliation(s)
- Jiahao Mo
- School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Qi Yang
- School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Na Zhang
- College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
| | - Wenxiang Zhang
- School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
| | - Yi Zheng
- School of Environmental Science and Engineering, Southern University of Science & Technology, Shenzhen 518055, Guangdong Province, China
| | - Zhien Zhang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China.
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109
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Wimsatt JH, Montgomery C, Thomas LS, Savard C, Tallman R, Innes K, Jrebi N. Assessment of a mouse xenograft model of primary colorectal cancer with special reference to perfluorooctane sulfonate. PeerJ 2018; 6:e5602. [PMID: 30405966 PMCID: PMC6216948 DOI: 10.7717/peerj.5602] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 08/18/2018] [Indexed: 01/28/2023] Open
Abstract
Colorectal cancer ranks third among the most commonly diagnosed cancers in the United States. Current therapies have a range of side effects, and the development of a reliable animal model to speed the discovery of safe effective preventative therapies would be of great value. A cross-sectional study in a large Appalachian population recently showed an association between low circulating levels of perfluorooctane sulfonate (PFOS) and a reduced prevalence of colorectal cancer. A study using APCmin (C57BL/6J-ApcMin/J) mice prone to familial adenomatous polyposis found PFOS was protective when exposure occurred during tumor development. To test the possible benefit of PFOS on spontaneous colorectal cancer, we developed a mouse model utilizing primary patient colorectal cancer implants into NSG (NOD.Cg-PrkdcscidIl2rgtm1Wjl /Sz) mice. Study goals included: (1) to assess potential factors supporting the successful use of colorectal cancer from heterogeneous tumors for PDX studies; and, (2) evaluate PFOS as a therapy in tumor matched pairs of mice randomized to receive PFOS or vehicle. The time in days for mice to grow primary tumors to 5 mm took almost 2 months (mean = 53.3, se = 5.7, range = 17-136). Age of mice at implantation, patient age, gender and race appeared to have no discernable effect on engraftment rates. Engraftment rates for low and high-grade patient tumors were similar. PFOS appeared to reduce tumor size dramatically in one group of tumors, those from the right ascending colon. That is, by 5 weeks of treatment in two mice, PFOS had eliminated their 52.4 mm3 and 124.6 mm3 masses completely, an effect that was sustained for 10 weeks of treatment; in contrast, their corresponding matched vehicle control mice had tumors that grew to 472.7 mm3 and 340.1 mm3 in size respectively during the same period. In a third xenograft mouse, the tumor growth was dramatically blunted although not eliminated, and compared favorably to their matched vehicle controls over the same period. These preliminary findings suggested that this mouse model may be advantageous for testing compounds of potential value in the treatment of colorectal cancer, and PFOS may have utility in selected cases.
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Affiliation(s)
- Jeffrey H Wimsatt
- Department of Medicine, West Virginia University, Morgantown, WV, United States of America.,Department of Epidemiology, West Virginia University, Morgantown, WV, United States of America
| | - Caitlin Montgomery
- Department of Medicine, West Virginia University, Morgantown, WV, United States of America.,Department of Epidemiology, West Virginia University, Morgantown, WV, United States of America
| | - Laurel S Thomas
- Department of Medicine, West Virginia University, Morgantown, WV, United States of America
| | - Charity Savard
- Department of Medicine, West Virginia University, Morgantown, WV, United States of America
| | - Rachel Tallman
- Department of Medicine, West Virginia University, Morgantown, WV, United States of America
| | - Kim Innes
- Department of Epidemiology, West Virginia University, Morgantown, WV, United States of America
| | - Nezar Jrebi
- Department of Surgery, West Virginia University, Morgantown, WV, United States of America
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110
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Bao Y, Deng S, Jiang X, Qu Y, He Y, Liu L, Chai Q, Mumtaz M, Huang J, Cagnetta G, Yu G. Degradation of PFOA Substitute: GenX (HFPO-DA Ammonium Salt): Oxidation with UV/Persulfate or Reduction with UV/Sulfite? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:11728-11734. [PMID: 30207460 DOI: 10.1021/acs.est.8b02172] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hexafluoropropylene oxide dimer acid (HFPO-DA, ammonium salt with trade name: GenX) has been recently detected in river water worldwide. There are significant concerns about its persistence, and potential adverse effects to the biota. In this study, the degradability of GenX by typical advanced redox technologies (UV/persulfate and UV/sulfate) is investigated. Results demonstrate that <5% GenX is oxidized after 3 h in UV/persulfate system, which is much lower than ∼27% for PFOA. In comparison, GenX can be readily degraded and defluorinated by hydrated electron (eaq-) generated by UV/sulfite system. Specifically, GenX is not detectable after 2 h, and >90% of fluoride ion is recovered 6 h later. This is attributed to the accumulation and subsequent degradation of CF3CF2COOH and CF3COOH, which are stable intermediates of GenX degradation. Mechanistic investigations suggest that the etheric bond in the molecule is a favorable attack point for the eaq-. Such finding is corroborated by quantum chemical calculations. The side CF3- at the α-carbon probably acts as an effective barrier that prevents GenX from being cleaved by SO4-• or OH• at its most sensible point (i.e. the carboxyl group). This study illustrates that reduction by UV/sulfite might be a promising technology to remove GenX from contaminated water.
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Affiliation(s)
- Yixiang Bao
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Shanshan Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Xinshu Jiang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Yingxi Qu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Yuan He
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Liquan Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Qiwan Chai
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Mehvish Mumtaz
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Jun Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Giovanni Cagnetta
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control (BKLEOC), School of Environment, POPs Research Center , Tsinghua University , Beijing 100084 , China
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111
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Yang Y, Ding Q, Yang M, Wang Y, Liu N, Zhang X. Magnetic ion exchange resin for effective removal of perfluorooctanoate from water: study of a response surface methodology and adsorption performances. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:29267-29278. [PMID: 30120730 DOI: 10.1007/s11356-018-2797-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/18/2018] [Indexed: 06/08/2023]
Abstract
This research exhibited the use of magnetic ion exchange (MIEX) resin as an effective adsorbent for the removal of perfluorooctanoate (PFOA) in aqueous solution. The adsorption performance of PFOA was investigated by a batch experiment. All kinds of factors affecting the adsorption of PFOA, including adsorbent dosage, initial concentration, adsorption time, temperature, stirring intensity, coexistent anions, initial solution pH, natural organic matter, ion strength, and bed volume were studied. Moreover, the response surface methodology was put into use to know the key parameters affecting PFOA removal efficiency. The sorption equilibrium and kinetic data could conform well to the Langmuir and pseudo-second-order model, respectively. Thermodynamic parameters were obtained, and it was observed that the adsorption of PFOA onto MIEX resin was an endothermic and spontaneous process at the temperatures under investigation. It was summarized that both chemical absorption and physical adsorption were involved in the PFOA sorption onto the MIEX resin. Moreover, the MIEX resin could be effectively regenerated using a saturated sodium chloride solution. A series of batch experiments and characterizations demonstrated that the MIEX resin possessed a strong adsorption ability with the removal efficiency exceeding 90%, allowing a possible practical application in future water treatment.
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Affiliation(s)
- Yiqiong Yang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Qiao Ding
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Minhui Yang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Yin Wang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Ning Liu
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Xiaodong Zhang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China.
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112
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Zhao C, Hu G, Hou D, Yu L, Zhao Y, Wang J, Cao A, Zhai Y. Study on the effects of cations and anions on the removal of perfluorooctane sulphonate by nanofiltration membrane. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.03.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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113
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Liu T, Gu Y, Xing DY, Dong W, Wu X. Rapid and high-capacity adsorption of PFOS and PFOA by regenerable ammoniated magnetic particle. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:13813-13822. [PMID: 29508201 DOI: 10.1007/s11356-018-1578-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
Adsorption is well accepted as an effective method for perfluorinated compounds' (PFCs) removal from water among various conventional methods. However, development of adsorbents that combine good performance of PFC removal and regenerability has not yet been realized. This work demonstrated the fabrication and application of an ammoniated magnetic adsorbent for efficient and economical PFOS and PFOA removal. Functional ammonium groups and γ-Fe2O3 were effectively incorporated in the particle with the proposed method. These fabricated magnetic particles presented superior adsorption performance for PFOS and PFOA with short equilibrium time of 120 min and high adsorption capacity. The isotherms revealed that the adsorption process belonged to multilayer sorption with their intricate interactions including anion exchange and hydrophobic interaction. The magnetic particle maintained its removal efficacy over a wide pH range of 3-9 or with coexisting substances. Moreover, the regeneration and reuse of the magnetic particle were successfully carried out with PFOS and PFOA removal efficiency sustained higher than 80% in 15 consecutive treatment cycles. Along with the efficient adsorption and easy separation of adsorbents, we expect that this ammoniated magnetic particle can serve as an excellent alternative for PFOS and PFOA removal from water.
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Affiliation(s)
- Tongzhou Liu
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China
| | - Yurong Gu
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China
| | - Ding Yu Xing
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China.
| | - Wenyi Dong
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China
| | - Xiuwei Wu
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China
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114
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Llorca M, Schirinzi G, Martínez M, Barceló D, Farré M. Adsorption of perfluoroalkyl substances on microplastics under environmental conditions. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 235:680-691. [PMID: 29339337 DOI: 10.1016/j.envpol.2017.12.075] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 12/20/2017] [Accepted: 12/21/2017] [Indexed: 05/10/2023]
Abstract
Plastic debris has become an environmental problem during recent years. Among the plastic debris, microplastics (<5 mm; MPLs) imply an extra problem due to their capacity to enter into the fauna through ingestion. In this work, we study the capacity of three MPLs, that include high-density polyethylene (HDPE), polystyrene (PS) and polystyrene carboxylate (PS-COOH), to sorb 18 perfluoroalkyl substances (PFASs; including carboxylic acids, sulphonates and one sulphonamide) from the surrounding waters (freshwater and seawater). Conclusions drawn from the results are that perfluoro sulphonates and sulphonamides have more tendency to be sorbed onto MPLs. In addition, PS and PS-COOH have more affinity for PFASs than HDPE. Finally, the increment of conductivity and pH of the water decreases the exposure time that is necessary to reach equilibrium. However, the presence of salts decreases the tendency of PFASs to be sorbed onto plastic surfaces. These results highlight the problem associated with the presence of MPLs in inland and marine waters since toxic compounds can be sorbed onto surrounding plastics that could be ingested by aquatic fauna.
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Affiliation(s)
- Marta Llorca
- Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Gabriella Schirinzi
- Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Mònica Martínez
- Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain; Department of Materials Science and Physical Chemistry, Faculty of Chemistry, Martí i Franquès 1, 08028 Barcelona, Spain
| | - Damià Barceló
- Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain; Catalan Institute for Water Research (ICRA), H2O Building, Scientific and Technological Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain
| | - Marinella Farré
- Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
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115
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Omorodion H, Palenzuela M, Ruether M, Twamley B, Platts JA, Baker RJ. A rationally designed perfluorinated host for the extraction of PFOA from water utilising non-covalent interactions. NEW J CHEM 2018. [DOI: 10.1039/c7nj03026f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Three hosts for the encapsulation of perfluorooctanoic acid have been synthesized. The host:guest complexes have been characterized by multinuclear NMR spectroscopy in solution and the solid state.
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Affiliation(s)
| | - Miguel Palenzuela
- School of Chemistry
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | - Manuel Ruether
- School of Chemistry
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | - Brendan Twamley
- School of Chemistry
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | | | - Robert J. Baker
- School of Chemistry
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
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116
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Kucharzyk KH, Darlington R, Benotti M, Deeb R, Hawley E. Novel treatment technologies for PFAS compounds: A critical review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 204:757-764. [PMID: 28818342 DOI: 10.1016/j.jenvman.2017.08.016] [Citation(s) in RCA: 192] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 07/26/2017] [Accepted: 08/08/2017] [Indexed: 05/20/2023]
Abstract
Perfluorinated compounds such as perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have recently drawn great attention due to their wide distribution in aquatic environments. The understanding of the physicochemical properties and fate and transport of PFAs in groundwater is still limited. Preliminary studies indicate that these compounds can readily bioaccumulate and pose human and animal health concerns. Due to their physicochemical properties, PFOS and PFOA are water soluble, nonvolatile and persistent in the environment, which is a cause of concern related to their treatment with conventional remediation technologies. Extraction with inefficient carbon adsorption is one of the most common treatment technologies for remediation of PFOS- or PFOA-impacted groundwater. Several other innovative and promising technologies, including sonochemistry, bioremediation and photolysis, have been tested for their effectiveness in removal of perfluorinated compounds. This paper provides a baseline for understanding research needs to better develop treatment technologies for PFOA and PFOS in groundwater. Frontiers for improving the state of practice for PFOA and PFOS treatment include the development of more cost-effective ex situ treatment methods and the development and demonstration of promising in situ treatment technologies at the pilot and full scale.
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Affiliation(s)
| | | | - Mark Benotti
- Newfields Environmental, Rockland, MA, 02371, USA
| | - Rula Deeb
- Geosyntec Consultants, Atlanta, GA, 30319, USA
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117
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Facile and efficient synthesis of polyacrylonitrile-based functional fibers and its sorption properties of perfluorooctane sulfonate and perfluorooctanoate. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.090] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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118
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Adsorption of perfluorooctane sulfonate (PFOS) on corn straw-derived biochar prepared at different pyrolytic temperatures. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.06.013] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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119
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Mudumbi JBN, Ntwampe SKO, Matsha T, Mekuto L, Itoba-Tombo EF. Recent developments in polyfluoroalkyl compounds research: a focus on human/environmental health impact, suggested substitutes and removal strategies. ENVIRONMENTAL MONITORING AND ASSESSMENT 2017; 189:402. [PMID: 28721589 DOI: 10.1007/s10661-017-6084-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 06/20/2017] [Indexed: 06/07/2023]
Abstract
Between the late 1940s and early 1950s, humans manufactured polyfluoroalkyl compounds (PFCs) using electrochemical fluorination and telomerisation technologies, whereby hydrogen atoms are substituted by fluorine atoms, thus conferring unnatural and unique physicochemical properties to these compounds. Presently, there are wide ranges of PFCs, and owing to their bioaccumulative properties, they have been detected in various environmental matrices and in human sera. It has thus been suggested that they are hazardous. Hence, this review aims at highlighting the recent development in PFC research, with a particular focus on perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS), the most studied and predominantly found PFCs in various environmental matrices, although recent reports have included perfluorobutane sulfonate (PFBS), which was previously regarded as innocuously harmless, when compared to its counterparts, PFOA and PFOS. As such, proper investigations are thus required for a better understanding of short-chain PFC substitutes, which have been suggested as suitable replacements to long-chained PFCs, although these substitutes have also been suggested to pose various health risks comparable to those associated with long-chain PFCs. Similarly, several novel technologies, such as PFC reduction using zero-valent iron, including removal at point of use, adsorption and coagulation, have been proposed. However, regardless of how efficient removers some of these techniques have proven to be, short-chain PFCs remain a challenge to overcome for scientists, in this regard.
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Affiliation(s)
- John Baptist Nzukizi Mudumbi
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, PO Box 652, Cape Town, 8000, South Africa.
| | - Seteno Karabo Obed Ntwampe
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, PO Box 652, Cape Town, 8000, South Africa
| | - Tandi Matsha
- Department of Bio-Medical Sciences, Faculty of Health and Wellness Science, Cape Peninsula University of Technology, PO Box 1906, Bellville, 7535, South Africa
| | - Lukhanyo Mekuto
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, PO Box 652, Cape Town, 8000, South Africa
| | - Elie Fereche Itoba-Tombo
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, PO Box 652, Cape Town, 8000, South Africa
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120
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Wu D, Li X, Tang Y, Lu P, Chen W, Xu X, Li L. Mechanism insight of PFOA degradation by ZnO assisted-photocatalytic ozonation: Efficiency and intermediates. CHEMOSPHERE 2017; 180:247-252. [PMID: 28411540 DOI: 10.1016/j.chemosphere.2017.03.127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 03/06/2017] [Accepted: 03/21/2017] [Indexed: 06/07/2023]
Abstract
Zinc oxide (ZnO) nanorods were prepared by a directly pyrolysis method and employed as catalyst for perfluorooctanoic acid (PFOA) degradation. Comparative experiments were conducted to discuss the catalytic activity and flexibility of ZnO. After ZnO addition, the best PFOA degradation efficiency (70.5%) was achieved by ZnO/UV/O3 system, only 9.5% by sole ozonation and 18.2% by UV254 light irradiation. PFOA degradation was sensitive with pH value and temperature. The better PFOA removal efficiency was achieved at acidic condition. A novel relationship was found among PFOA degradation efficiency with hydroxyl radicals and photo-generated holes. Hydroxyl radicals generated on the surfaces of ZnO nanorods played dominant roles in PFOA degradation. PFOA degradation was found to follow the photo-Kolbe reaction mechanism. C2-C7 shorter-chain perfluorocarboxylic acids and fluoride ion were detected as main intermediates during PFOA degradation process. Based on the results, a proposal degradation pathway was raised.
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Affiliation(s)
- Dan Wu
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China
| | - Xukai Li
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China; Guangdong Provincial Key Lab of Functional Materials for Environmental Protection, Guangzhou 510006, China
| | - Yiming Tang
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China; Guangdong Provincial Key Lab of Functional Materials for Environmental Protection, Guangzhou 510006, China
| | - Ping Lu
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China; Guangdong Provincial Key Lab of Functional Materials for Environmental Protection, Guangzhou 510006, China
| | - Weirui Chen
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China
| | - Xiaoting Xu
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China
| | - Laisheng Li
- School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China; Guangdong Provincial Key Lab of Functional Materials for Environmental Protection, Guangzhou 510006, China.
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121
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Du L, Wu Y, Zhang X, Zhang F, Chen X, Cheng Z, Wu F, Tan K. Preparation of magnetic molecularly imprinted polymers for the rapid and selective separation and enrichment of perfluorooctane sulfonate. J Sep Sci 2017; 40:2819-2826. [DOI: 10.1002/jssc.201700157] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/05/2017] [Accepted: 05/07/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Lingling Du
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Yongqiong Wu
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Xiaoli Zhang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Fang Zhang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Xianping Chen
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Zhen Cheng
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
| | - Fei Wu
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
- Chongqing Academy of Environmental Sciences; Chongqing China
| | - Kejun Tan
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering; Southwest University; Chongqing China
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122
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Zhang J, Liu M, Yang T, Yang K, Wang H. Synthesis and characterization of a novel magnetic biochar from sewage sludge and its effectiveness in the removal of methyl orange from aqueous solution. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1539-1547. [PMID: 28402294 DOI: 10.2166/wst.2017.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A novel magnetic biochar from sewage sludge (MSBC) using SrFe12O19 as magnetic substrate was successfully synthesized under high-temperature and oxygen-free conditions. Several techniques and methodologies (X-ray diffraction, Fourier transform infrared spectroscopy and vibrating sample magnetometer) were used to determine the surface functional groups and physicochemical properties of MSBC, which showed that the MSBC combined the features of both SrFe12O19 and sludge biochar (SBC). And then the adsorption behavior of methyl orange (MO) from aqueous solution onto the MSBC was investigated. And the influence of variables including pH, initial concentration of MO, adsorbent dosage and contact time was studied in detail. The optimal adsorption amount of MO (149.18 mg·g-1) was obtained with 600 MO mg·L-1, 2 MSBC g·L-1, at pH of 5 for 40 min. The equilibrium data were evaluated using Langmuir and Freundlich isotherms. The Langmuir model better described the absorption of MO. Besides, the kinetic data were analyzed using pseudo-first-order and pseudo-second-order equations, and the pseudo-second order exhibited the better fit for the kinetic studies (R2 = 0.9982). This study showed that MSBC could be utilized as an efficient, magnetically separable adsorbent for the environmental cleanup.
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Affiliation(s)
- Jing Zhang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail:
| | - Mao Liu
- School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail:
| | - Tao Yang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail:
| | - Kai Yang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail:
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China E-mail:
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123
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Meng P, Deng S, Du Z, Wang B, Huang J, Wang Y, Yu G, Xing B. Effect of hydro-oleophobic perfluorocarbon chain on interfacial behavior and mechanism of perfluorooctane sulfonate in oil-water mixture. Sci Rep 2017; 7:44694. [PMID: 28300199 PMCID: PMC5353549 DOI: 10.1038/srep44694] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 02/13/2017] [Indexed: 11/17/2022] Open
Abstract
Perfluorocarbon chain of perfluorooctane sulfonate (PFOS) is not only hydrophobic but also oleophobic, and its effect on PFOS distribution in oil-water mixture and underlying mechanism are unclear. For the first time, we propose that PFOS can emulsify oil-water mixture only in the presence of air, completely different from hydrocarbon surfactants. The perfluorocarbon chain repels hydrophobic compounds and its oleophobicity increases with decreasing polarity of organic solvents. The formed emulsion in oil phase contains high concentrations of PFOS, resulting in PFOS decrease in water. The increase of shaking speed and time as well as oil and air volume all increase the emulsification and decrease PFOS concentrations in water. During the settling process, the emulsion gradually disappears and the concentrated PFOS is released into water. The emulsification mechanism of PFOS based on air bubbles is proposed, and PFOS partitions to the interfaces of air bubbles with the hydro-oleophobic perfluorocarbon chain stretching into air bubbles and the polar head in water. This study clarifies the ambiguous understanding of the oleophobicity of perfluorocarbon chain in PFOS, and it is helpful for the understanding of the transport and fate of PFOS at oil-water interfaces in aquatic environments as well as the enhanced removal of PFOS from wastewater.
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Affiliation(s)
- Pingping Meng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Shubo Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Ziwen Du
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Bin Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Jun Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Yujue Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts, 01003, USA
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124
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Hale SE, Arp HPH, Slinde GA, Wade EJ, Bjørseth K, Breedveld GD, Straith BF, Moe KG, Jartun M, Høisæter Å. Sorbent amendment as a remediation strategy to reduce PFAS mobility and leaching in a contaminated sandy soil from a Norwegian firefighting training facility. CHEMOSPHERE 2017; 171:9-18. [PMID: 28002769 DOI: 10.1016/j.chemosphere.2016.12.057] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/09/2016] [Accepted: 12/11/2016] [Indexed: 05/12/2023]
Abstract
Aqueous film-forming foams (AFFF) containing poly- and perfluoroalkyl substances (PFAS) used for firefighting have led to the contamination of soil and water at training sites. The unique physicochemical properties of PFAS results in environmental persistency, threatening water quality and making remediation of such sites a necessity. This work investigated the role of sorbent amendment to PFAS contaminated soils in order to immobilise PFAS and reduce mobility and leaching to groundwater. Soil was sampled from a firefighting training facility at a Norwegian airport and total and leachable PFAS concentrations were quantified. Perfluorooctanesulfonic acid (PFOS) was the most dominant PFAS present in all soil samples (between 9 and 2600 μg/kg). Leaching was quantified using a one-step batch test with water (L/S 10). PFOS concentrations measured in leachate water ranged between 1.2 μg/L and 212 μg/L. Sorbent amendment (3%) was tested by adding activated carbon (AC), compost soil and montmorillonite to selected soils. The extent of immobilisation was quantified by measuring PFAS concentrations in leachate before and after amendment. Leaching was reduced between 94 and 99.9% for AC, between 29 and 34% for compost soil and between 28 and 40% for the montmorillonite amended samples. Sorbent + soil/water partitioning coefficients (KD) were estimated following amendment and were around 8 L/kg for compost soil and montmorillonite amended soil and ranged from 1960 to 16,940 L/kg for AC amended soil. The remediation of AFFF impacted soil via immobilisation of PFAS following sorbent amendment with AC is promising as part of an overall remediation strategy.
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Affiliation(s)
| | | | | | | | | | - Gijs D Breedveld
- Norwegian Geotechnical Institute, Oslo, Norway; Department of Geosciences, University of Oslo, Norway
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125
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Chen W, Zhang X, Mamadiev M, Wang Z. Sorption of perfluorooctane sulfonate and perfluorooctanoate on polyacrylonitrile fiber-derived activated carbon fibers: in comparison with activated carbon. RSC Adv 2017. [DOI: 10.1039/c6ra25230c] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PANF-derived activated carbon fibers (PACFs) were prepared using a one step carbonation–activation, and used for the sorption of PFOS and PFOA.
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Affiliation(s)
- Wei Chen
- School of Environment and Energy
- South China University of Technology
- Guangzhou Higher Education Mega Centre
- Guangzhou 510006
- PR China
| | - Xiaoping Zhang
- School of Environment and Energy
- South China University of Technology
- Guangzhou Higher Education Mega Centre
- Guangzhou 510006
- PR China
| | - Mairambek Mamadiev
- School of Environment and Energy
- South China University of Technology
- Guangzhou Higher Education Mega Centre
- Guangzhou 510006
- PR China
| | - Zihao Wang
- School of Environment and Energy
- South China University of Technology
- Guangzhou Higher Education Mega Centre
- Guangzhou 510006
- PR China
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126
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Gong Y, Wang L, Liu J, Tang J, Zhao D. Removal of aqueous perfluorooctanoic acid (PFOA) using starch-stabilized magnetite nanoparticles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 562:191-200. [PMID: 27100000 DOI: 10.1016/j.scitotenv.2016.03.100] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 03/14/2016] [Accepted: 03/14/2016] [Indexed: 06/05/2023]
Abstract
Fully stabilized magnetite (Fe3O4) nanoparticles were prepared with a water-soluble starch as a stabilizer and tested for removal of aqueous perfluorooctanoic acid (PFOA). The presence of starch at ≥0.2wt% can fully stabilize 0.1g/L as Fe of the Fe3O4 nanoparticles. The particle stabilization technique resulted in 2.4 times higher PFOA uptake. Fourier transform infrared spectra suggested that the main PFOA removal mechanism was inner-sphere complexation. Batch kinetic experiments revealed that the starch-stabilized nanoparticles facilitated a rapid PFOA uptake with a sorption equilibrium time of 30min, and the sorption process followed a pseudo-second-order kinetic model. The Langmuir model was able to well interpret the adsorption isotherm, with a maximum adsorption capacity of 62.5mg/g. Increasing pH from 4.7 to 9.6 led to a sharp increase (by 2.6 times) in PFOA uptake. The presence of 12mg/L humic acid inhibited PFOA uptake by 96%, while effect of ionic strength (CaCl2=0-2mmol/L) was negligible. The nanoparticles significantly reduced the biological toxicity of PFOA. The results demonstrated promise of starch-stabilized Fe3O4 nanoparticles as a "green" adsorbent for effective removal of PFOA in soil and groundwater.
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Affiliation(s)
- Yanyan Gong
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin 300350, China; Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China
| | - Lin Wang
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Juncheng Liu
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingchun Tang
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin 300350, China; Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
| | - Dongye Zhao
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA.
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127
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Kinetics, equilibrium and thermodynamics studies of Pb2+ adsorption onto new activated carbon prepared from Persian mesquite grain. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.03.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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128
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Lu X, Deng S, Wang B, Huang J, Wang Y, Yu G. Adsorption behavior and mechanism of perfluorooctane sulfonate on nanosized inorganic oxides. J Colloid Interface Sci 2016; 474:199-205. [PMID: 27127908 DOI: 10.1016/j.jcis.2016.04.032] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 04/20/2016] [Accepted: 04/20/2016] [Indexed: 10/21/2022]
Abstract
Adsorption of perfluorooctane sulfonate (PFOS) on manufactured nanoparticles (NPs) is critical for understanding their transport and fate in aquatic environments. In this study, the adsorption behavior of PFOS on nanosized Al2O3, Fe2O3, SiO2 and TiO2 was examined in terms of adsorption isotherms and influences of pH, ionic strength and heavy metallic cations. The nano-oxides had much higher adsorption capacities than bulk particles due to higher surface hydroxyl density. PFOS adsorption showed strong pH dependence due to different species of surface hydroxyl groups on nano-oxides. Besides electrostatic interaction, sulfonic group of PFOS possibly formed hydrogen bonds on the surface of nano-oxides. Because of the bridging effect in the co-adsorption process, the coexisting PFOS and heavy metallic cations greatly enhanced their adsorption onto the nano-oxides. Comparative adsorption of different perfluorinated sulfonates indicated the possible formation of bilayer PFOS adsorption on the nano-oxides, leading to the enhanced Cu(II) adsorption on the sulfonic groups of PFOS on the surfaces through electrostatic interaction.
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Affiliation(s)
- Xinyu Lu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Shubo Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Bin Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jun Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yujue Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China
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129
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Niu J, Li Y, Shang E, Xu Z, Liu J. Electrochemical oxidation of perfluorinated compounds in water. CHEMOSPHERE 2016; 146:526-538. [PMID: 26745381 DOI: 10.1016/j.chemosphere.2015.11.115] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/26/2015] [Accepted: 11/27/2015] [Indexed: 06/05/2023]
Abstract
Perfluorinated compounds (PFCs) are persistent and refractory organic pollutants that have been detected in various environmental matrices and municipal wastewater. Electrochemical oxidation (EO) is a promising remediation technique for wastewater contaminated with PFCs. A number of recent studies have demonstrated that the "non-active" anodes, including boron-doped diamond, tin oxide, and lead dioxide, are effective in PFCs elimination in wastewater due to their high oxygen evolution potential. Many researchers have conducted experiments to investigate the optimal conditions (i.e., potential, current density, pH value, plate distance, initial PFCs concentration, electrolyte, and other factors) for PFCs elimination to obtain the maximal elimination efficiency and current efficiency. The EO mechanism and pathways of PFCs have been clearly elucidated, which undergo electron transfer, Kolbe decarboxylation or desulfonation, hydrolysis, and radical reaction. In addition, the safety evaluation and energy consumption evaluation of the EO technology have also been summarized to decrease toxic ion release from electrode and reduce the cost of this technique. Although the ultrasonication and hydrothermal techniques combined with the EO process can improve the removal efficiency and current efficiency significantly, these coupled techniques have not been commercialized and applied in industrial wastewater treatment. Finally, key challenges facing EO technology are listed and the directions for further research are pointed out (such as combination with other techniques, treatment for natural waters contaminated by low levels of PFCs, and reactor design).
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Affiliation(s)
- Junfeng Niu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
| | - Yang Li
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Enxiang Shang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Zesheng Xu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Jinzi Liu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
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130
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A Porous Aromatic Framework Constructed from Benzene Rings Has a High Adsorption Capacity for Perfluorooctane Sulfonate. Sci Rep 2016; 6:20311. [PMID: 26843015 PMCID: PMC4740861 DOI: 10.1038/srep20311] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 01/04/2016] [Indexed: 12/25/2022] Open
Abstract
A low-cost and easily constructed porous aromatic framework (PAF-45) was successfully prepared using the Scholl reaction. PAF-45 was, for the first time, used to remove perfluorooctane sulfonate (PFOS) from aqueous solution. Systematic experiments were performed to determine the adsorption capacity of PAF-45 for PFOS and to characterize the kinetics of the adsorption process. The adsorption of PFOS onto PAF-45 reached equilibrium in 30 min, and the adsorption capacity of PAF-45 for PFOS was excellent (5847 mg g−1 at pH 3). The amount of PFOS adsorbed by PAF-45 increased significantly as the cation (Na+, Mg2+, or Fe3+) concentration increased, which probably occurred because the cations enhanced the interactions between the negatively charged PFOS molecules and the positively charged PAF-45 surface. The cations Na+, Mg2+, and Fe3+ were found to form complexes with PFOS anions in solution. Density functional theory was used to identify the interactions between PFOS and Na+, Mg2+, and Fe3+. We expect that materials of the same type as PAF-45 could be useful adsorbents for removing organic pollutants from industrial wastewater and contaminated surface water.
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131
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He J, Dai J, Zhang T, Sun J, Xie A, Tian S, Yan Y, Huo P. Preparation of highly porous carbon from sustainable α-cellulose for superior removal performance of tetracycline and sulfamethazine from water. RSC Adv 2016. [DOI: 10.1039/c6ra00277c] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hierarchical carbon materials with ultrahigh specific surface area were synthesized by KOH activation from sustainable α-cellulose and employed as adsorbents for the effective removal of tetracycline (TC) and sulfamethazine (SMZ) from water.
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Affiliation(s)
- Jinsong He
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Jiangdong Dai
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Tao Zhang
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Jun Sun
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Atian Xie
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Sujun Tian
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Yongsheng Yan
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials (Ministry of Education)
| | - Pengwei Huo
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
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132
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Xue A, Yuan ZW, Sun Y, Cao AY, Zhao HZ. Electro-oxidation of perfluorooctanoic acid by carbon nanotube sponge anode and the mechanism. CHEMOSPHERE 2015; 141:120-126. [PMID: 26172515 DOI: 10.1016/j.chemosphere.2015.06.095] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 06/24/2015] [Accepted: 06/25/2015] [Indexed: 06/04/2023]
Abstract
As an emerging persistent organic pollutant (POPs), perfluorooctanoic acid (PFOA) exists widely in natural environment. It is of particular significance to develop efficient techniques to remove low-concentration PFOA from the contaminated waters. In this work, we adopted a new material, carbon nanotube (CNT) sponge, as electrode to enhance electro-oxidation and achieve high removal efficiency of low-concentration (100μgL(-1)) PFOA from water. CNT sponge was pretreated by mixed acids to improve the surface morphology, hydrophilicity and the content of carbonyl groups on the surface. The highest removal efficiencies for low-concentration PFOA electrolyzed by acid-treated CNT sponge anode proved higher than 90%. The electro-oxidation mechanism of PFOA on CNT sponge anode was also discussed. PFOA is adsorbed on the CNT sponge rapidly increasing the concentration of PFOA on anode surface. When the potential on the anode is adjusted to more than 3.5V, the adsorbed PFOA undergoes electrochemically oxidation and hydrolysis to produce shorter-chain perfluorocarboxylic acids with less CF2 unit. The efficient electro-oxidation of PFOA by CNT sponge anode is due to the combined effect of adsorption and electrochemical oxidation. These findings provide an efficient method to remove actual concentration PFOA from water.
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Affiliation(s)
- An Xue
- Department of Environmental Engineering, Peking University, Beijing 100871, People's Republic of China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, People's Republic of China
| | - Zi-Wen Yuan
- Department of Environmental Engineering, Peking University, Beijing 100871, People's Republic of China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, People's Republic of China
| | - Yan Sun
- Department of Environmental Engineering, Peking University, Beijing 100871, People's Republic of China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, People's Republic of China
| | - An-Yuan Cao
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Hua-Zhang Zhao
- Department of Environmental Engineering, Peking University, Beijing 100871, People's Republic of China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, People's Republic of China.
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133
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Comparison of 2-amino benzyl alcohol adsorption onto activated carbon, silicon carbide nanoparticle and silicon carbide nanoparticle loaded on activated carbon. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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134
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Du Z, Deng S, Chen Y, Wang B, Huang J, Wang Y, Yu G. Removal of perfluorinated carboxylates from washing wastewater of perfluorooctanesulfonyl fluoride using activated carbons and resins. JOURNAL OF HAZARDOUS MATERIALS 2015; 286:136-43. [PMID: 25585266 DOI: 10.1016/j.jhazmat.2014.12.037] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 12/10/2014] [Accepted: 12/20/2014] [Indexed: 05/08/2023]
Abstract
Perfluorooctanesulfonyl fluoride (PFOSF) washing wastewater contains high concentrations of perfluorinated carboxylates (PFCAs) including perfluorohexanoate (PFHxA, 0.10 mmol/L), perfluoroheptanoate (PFHpA, 0.11 mmol/L), and perfluorooctanoate (PFOA, 0.29 mmol/L). For the first time, we investigated the removal of these PFCAs from actual wastewater using the bamboo-derived activated carbon (BAC) and resin IRA67. Adsorption kinetics, effects of adsorbent dose, solution pH, and inorganic ions, as well as regeneration and reuse experiments were studied. The removal percents of three PFCAs by BAC and IRA67 followed the increasing order of PFHxA < PFHpA < PFOA, but the adsorption equilibrium time conformed to the reverse trend. PFCAs removal on IRA67 decreased with increasing pH, but BAC almost kept stable PFCAs removal at pH above 5.0. Among competitive adsorption of three PFCAs, PFOA was preferentially adsorbed on both BAC and IRA67. PFCAs removal from actual wastewater by BAC was higher than that in simulated solution, due to the presence of high concentration of inorganic ions in the wastewater. However, the co-existing organic compounds in wastewater significantly suppressed the adsorption of PFCAs. Both spent BAC and IRA67 were successfully regenerated by ethanol solution or NaCl/methanol mixture, and IRA67 showed the stable removal of PFCAs in five adsorption cycles.
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Affiliation(s)
- Ziwen Du
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
| | - Shubo Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Youguang Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
| | - Bin Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jun Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yujue Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
| | - Gang Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing Key Laboratory for Control of Emerging Organic Contaminants, School of Environment, Tsinghua University, Beijing 100084, China
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