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Jeong WG, Kim JG, Lee SM, Baek K. CaO 2-based electro-Fenton-oxidation of 1,2-dichloroethane in groundwater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 843:157065. [PMID: 35780882 DOI: 10.1016/j.scitotenv.2022.157065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/06/2022] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
It has been well recognized that the Fenton reaction requires a rigorous pH control and suffers from the fast self-degradation of H2O2. In an effort to resolve the technical demerits of the conventional Fenton reaction, particular concern on the use of CaO2-based Fenton reaction was paid in this study. To realize the practical use of CaO2 in the Fenton reaction for groundwater remediation, it could be of great importance to control its reaction rate in the subsurface. As such, this study laid great emphasis on the combined process of electrochemical oxidation and CaO2-based Fenton oxidation, using 1,2-dichloroethane (1,2-DCA) as a model compound. It was hypothesized that the reaction rate is also highly contingent on the formation of Fe(II) (stemmed from iron anode oxidation). Eighty percent of 1,2-DCA were degraded by the CaO2-based Fenton reaction. The final pH was neutral, inferring that the reaction could be a viable option for the subsurface environment. Moreover, the supply of electric current in an iron anode expedited 1,2-DCA degradation efficiency from 35 % to 62 % via electrically generated Fe(II), which donated electrons to H2O2, producing more hydroxyl radicals. An anode-cathode configuration from the single-well system enhanced the degradation of 1,2-DCA, with less amount of energy consumption than the double-well system. Based on results, CaO2-based electro-Fenton oxidation can remove well 1,2-DCA in groundwater and can be a strategic measure for groundwater remediation.
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Affiliation(s)
- Won-Gune Jeong
- Department of Environment & Energy, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea
| | - Jong-Gook Kim
- Department of Environment & Energy, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea
| | - Su-Min Lee
- Department of Environment & Energy, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea
| | - Kitae Baek
- Department of Environment & Energy, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea; School of Civil, Environmental, and Resources-Energy Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea.
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Treatment of arsenite contaminated water by electrochemically activated persulfate oxidation process. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119999] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Degradation and statistical optimization of 3,5,6-trichloro-2-pyridinol by zero valent iron-activated persulfate. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-018-0222-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kim JG, Park SM, Lee ME, Kwon EE, Baek K. Photocatalytic co-oxidation of As(III) and Orange G using urea-derived g-C 3N 4 and persulfate. CHEMOSPHERE 2018; 212:193-199. [PMID: 30144680 DOI: 10.1016/j.chemosphere.2018.08.081] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 07/26/2018] [Accepted: 08/15/2018] [Indexed: 05/27/2023]
Abstract
Urea was thermally degraded to be transformed into graphitic carbon nitride (g-C3N4), and the fabricated charring compound was aimed to use a photocatalyst for the simultaneous removal of Orange G (OG) and trivalent arsenic (As(III)) through photocatalytic oxidation. This study experimentally revealed that the degradation of OG substantially restricted the oxidation performance for As(III). To mitigate the unwanted inhibition arising from the decomposition of OG, persulfate (PS) was intentionally added, which synergistically expedited the reaction kinetics for governing the oxidation performance for both OG and As(III). Hydroxyl radicals formed in the presence of g-C3N4 become a driving force for PS to expedited sulfate radicals, which substantially increased the oxidation of OG and As(III). The intrinsic structure of g-C3N4 enhancing the photocatalytic stability guaranteed the re-usability of the photocatalyst. For instance, the fabricated photocatalyst in this study exhibited the same oxidation performance at least three times. Despite the intrinsic charring compound (i.e., high porosity), this study reported that the synthesized catalyst did not adsorb As species, therefore, the further treatment is required to remove the oxidized As. Thus, all experimental findings suggest that g-C3N4 derived from urea and PS could synergistically co-oxidize azo dye compound and As(III) from the aqueous phase.
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Affiliation(s)
- Jong-Gook Kim
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 54896, Republic of Korea
| | - Sang-Min Park
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 54896, Republic of Korea
| | - Myeong Eun Lee
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 54896, Republic of Korea
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University, Seoul, 05006, Republic of Korea
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 54896, Republic of Korea.
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Kim HB, Kim SH, Jeon EK, Kim DH, Tsang DCW, Alessi DS, Kwon EE, Baek K. Effect of dissolved organic carbon from sludge, Rice straw and spent coffee ground biochar on the mobility of arsenic in soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 636:1241-1248. [PMID: 29913586 DOI: 10.1016/j.scitotenv.2018.04.406] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 04/28/2018] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
To date, studies on the mobility of arsenic (As) in soil amended with biochar have primarily relied on broad empirical observations, resulting in a gap between the behavior of As in amended soil and the chemical mechanisms controlling that behavior. This study focuses on the influence of abiotic factors in As mobility in As-contaminated soils amended with biochar. In order to understand the leaching of DOC and phosphate across a range of biomass feedstock and pyrolysis temperature, rice straw and granular sludge from an anaerobic digester were pyrolyzed at 300, 550, and 700 °C, and subjected to leaching studies by mixing air dried soil with 10 wt% of biochar at a soil: water ratio of 1:1(w/v). The concentration of DOC in the presence of granular sludge biochar and rice straw biochar increased from 190 mg L-1 to 2605 mg L-1 and 1192 mg L-1, respectively, which considerable accelerated the mobilization of Fe and As. More specifically, DOC drove the reduction of Fe(III) to Fe(II). Our results suggest enhanced release of As via the reductive dissolution of iron oxides, including by the chelating-enhanced dissolution of Fe oxides, and competitive desorption by DOC and phosphate from biochar. The influence of DOC and phosphate was further evaluated using realistic application amounts (1, 3, and 5 wt%) of biochars derived from pyrolysis of granular sludge, rice straw and spent coffee ground at 300 and 550 °C. The results from these experiments further confirm that DOC is a key factor for influencing the mobility of As in the amendment of biochar to As-contaminated soil, which indicates that biochar having low levels of leachable carbon should be amended to As-contaminated soils, and with caution.
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Affiliation(s)
- Hye-Bin Kim
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University,Jeonju, Jeollabukdo 57896, Republic of Korea
| | - Seon-Hee Kim
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University,Jeonju, Jeollabukdo 57896, Republic of Korea
| | - Eun-Ki Jeon
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University,Jeonju, Jeollabukdo 57896, Republic of Korea
| | - Do-Hyung Kim
- Korea Environmental Industry and Technology Institute, Seoul 03367, Republic of Korea
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Daniel S Alessi
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University,Jeonju, Jeollabukdo 57896, Republic of Korea.
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Lee ME, Jeon EK, Tsang DCW, Baek K. Simultaneous application of oxalic acid and dithionite for enhanced extraction of arsenic bound to amorphous and crystalline iron oxides. JOURNAL OF HAZARDOUS MATERIALS 2018; 354:91-98. [PMID: 29729603 DOI: 10.1016/j.jhazmat.2018.04.083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 04/18/2018] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
To extract As bound to amorphous and crystalline iron oxides, this study proposed simultaneous application of oxalic acid and dithionite, which was observed to induce synergistic effect and accomplish effective extraction of As bound to both iron oxides. However, the formation of arsenic sulfide decreased overall removal of As because the insoluble precipitate form of As remained as a residual fraction of As in soil. Therefore, stepwise addition of dithionite in the simultaneous application was applied to minimize the formation of secondary minerals and maximize the As extraction. As a result, 74% of As bound to amorphous iron oxides and 65% of As bound to crystalline iron oxides were removed. More importantly, the stepwise application of oxalic acid and dithionite was effective to reduce the bioaccessible concentration of As in the treated soil. Therefore, the proposed application could reduce the potential risk of contaminated soil to human health by extraction-based remedial action.
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Affiliation(s)
- Myeong Eun Lee
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea
| | - Eun-Ki Jeon
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea.
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Yoon G, Park SM, Yang H, Tsang DCW, Alessi DS, Baek K. Selection criteria for oxidation method in total organic carbon measurement. CHEMOSPHERE 2018; 199:453-458. [PMID: 29453072 DOI: 10.1016/j.chemosphere.2018.02.074] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/06/2018] [Accepted: 02/11/2018] [Indexed: 06/08/2023]
Abstract
During the measurement of total organic carbon (TOC), dissolved organic carbon is converted into CO2 by using high temperature combustion (HTC) or wet chemical oxidation (WCO). However, the criteria for selecting the oxidation methods are not clear. In this study, the chemical structures of organic material were considered as a key factor to select the oxidation method used. Most non-degradable organic compounds showed a similar oxidation efficiency in both methods, including natural organic compounds, dyes, and pharmaceuticals, and thus both methods are appropriate to measure TOC in waters containing these compounds. However, only a fraction of the carbon in the halogenated compounds (perfluorooctanoic acid and trifluoroacetic acid) were oxidized using WCO, resulting in measured TOC values that are considerably lower than those determined by HTC. This result is likely due to the electronegativity of halogen elements which inhibits the approach of electron-rich sulfate radicals in the WCO, and the higher bond strength of carbon-halogen pairs as compared to carbon-hydrogen bonds, which results in a lower degree of oxidation of the compounds. Our results indicate that WCO could be used to oxidize most organic compounds, but may not be appropriate to quantify TOC in organic carbon pools that contain certain halogenated compounds.
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Affiliation(s)
- GeunSeok Yoon
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 561-756, Republic of Korea
| | - Sang-Min Park
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 561-756, Republic of Korea
| | - Heuiwon Yang
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 561-756, Republic of Korea
| | - Daniel C W Tsang
- Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Daniel S Alessi
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 561-756, Republic of Korea.
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Adsorption and photocatalytic activity of biochar with graphitic carbon nitride (g-C 3 N 4 ). J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.05.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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