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Wang J, Shaheen SM, Anderson CWN, Xing Y, Liu S, Xia J, Feng X, Rinklebe J. Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:2698-2706. [PMID: 32045518 DOI: 10.1021/acs.est.9b05685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Mercury (Hg) contamination of paddy field poses a health risk to rice consumers, and its remediation is a subject of global scientific attention. In recent years focus has been given to in situ techniques which reduce the risk of Hg entering the food chain. Here, we investigate the use of nanoactivated carbon (NAC) as a soil amendment to minimize Hg uptake by rice plants. Application of 1-3% NAC to soil (by weight) reduced Hg concentration in the pore water (by 61-76%) and its bioaccumulation in the tissues of rice plants (by 15-63%), relative to the corresponding control. Specifically, NAC reduced the Hg concentration of polished rice by 47-63% compared to the control, to a level that was 29-49% lower than the food safety value (20 ng g-1) defined by the Chinese government. The NAC induced a change in Hg binding from organic matter to nano-HgS in the soil as a function of soil amendment. This Hg speciation transformation might be coupled to the reduction of sulfoxide to reduced sulfur species (S0) by NAC. The NAC amendment may be a practical and effective solution to mitigate the risk of Hg transferring from contaminated soil to rice grains at locations around the world.
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Affiliation(s)
- Jianxu Wang
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550081 Guiyang, P. R. China
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
- CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, P. R. China
| | - Sabry M Shaheen
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
- King Abdulaziz University, Faculty of Meteorology, Environment, and Arid Land Agriculture, Department of Arid Land Agriculture, Jeddah 21589, Kingdom of Saudi Arabia
- University of Kafrelsheikh, Faculty of Agriculture, Department of Soil and Water Sciences, 33516 Kafr El-Sheikh, Egypt
| | - Christopher W N Anderson
- Environmental Sciences, School of Agriculture and Environment, Massey University, 4442 Palmerston North, New Zealand
| | - Ying Xing
- School of Chemistry and Materials Science, Guizhou Normal University, 550001 Guiyang, P. R. China
| | - Shirong Liu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550081 Guiyang, P. R. China
| | - Jicheng Xia
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550081 Guiyang, P. R. China
| | - Xinbin Feng
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550081 Guiyang, P. R. China
- CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, P. R. China
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
- University of Sejong, Department of Environment, Energy and Geoinformatics, 98 Gunja-Dong, Guangjin-Gu, Seoul 05006, Republic of Korea
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52
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Matsumoto M, Liu H. Mercury speciation and remediation strategies at a historically elemental mercury spilled site. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121351. [PMID: 31600697 DOI: 10.1016/j.jhazmat.2019.121351] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 09/25/2019] [Accepted: 09/28/2019] [Indexed: 06/10/2023]
Abstract
This study quantified the mercury speciation in a contaminated area three decades after an elemental mercury spill from a sodium nuclear reactor experiment, and evaluated ex situ and in situ remediation strategies. Soil samples were taken across multiple sites with different soil depths. A majority of total mercury was distributed in surface soils with depths between 0-0.5 m, and decreased exponentially with depths. In top soils with depths between 0-0.5 m, a considerable fraction of mercury exists in chemical forms that are highly mobile (i.e., bound to inorganic ions) or potential mobile (i.e., bound to soil humic substances). This suggests that bioremediation and phytoremediation may be effective to remove mercury in the top soils at contaminated sites. In deep soils below 1 m, mercury predominantly exists as elemental form that is tightly bound to soil particles. While this fraction of mercury poses no immediate health risk, in situ thermal treatment may be evaluated to remove this mercury fraction. Furthermore, size fractionation data suggest that as an ex situ excavation cleanup option, reducing the volume of contaminated soils is possible by only selecting the sand and gravel size fractions of soil for offsite treatment.
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Affiliation(s)
- Mark Matsumoto
- School of Engineering, University of California at Merced, Merced, CA 95343, USA
| | - Haizhou Liu
- Department of Chemical and Environmental Engineering, University of California at Riverside, Riverside, CA 92521, USA.
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53
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Chalkidis A, Jampaiah D, Hartley PG, Sabri YM, Bhargava SK. Mercury in natural gas streams: A review of materials and processes for abatement and remediation. JOURNAL OF HAZARDOUS MATERIALS 2020; 382:121036. [PMID: 31473516 DOI: 10.1016/j.jhazmat.2019.121036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 08/01/2019] [Accepted: 08/17/2019] [Indexed: 06/10/2023]
Abstract
The role of natural gas in mitigating greenhouse gas emissions and advancing renewable energy resource integration is undoubtedly critical. With the progress of hydrocarbons exploration and production, the target zones become deeper and the possibility of mercury contamination increases. This impacts on the industry from health and safety risks, due to corrosion and contamination of equipment, to catalyst poisoning and toxicity through emissions to the environment. Especially mercury embrittlement, being a significant problem in LNG plants using aluminum cryogenic heat exchangers, has led to catastrophic plant incidents worldwide. The aim of this review is to critically discuss the conventional and alternative materials as well as the processes employed for mercury removal during gas processing. Moreover, comments on studies examining the geological occurrence of mercury species are included, the latest developments regarding the detection, sampling and measurement are presented and updated information with respect to mercury speciation and solubility is displayed. Clean up and passivation techniques as well as disposal methods for mercury-containing waste are also explained. Most importantly, the environmental as well as the health and safety implications are addressed, and areas that require further research are pinpointed.
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Affiliation(s)
- Anastasios Chalkidis
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia; CSIRO Energy, Private Bag 10, Clayton South, VIC, 3169, Australia
| | - Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia
| | - Patrick G Hartley
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia; CSIRO Energy, Private Bag 10, Clayton South, VIC, 3169, Australia
| | - Ylias M Sabri
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia.
| | - Suresh K Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia.
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Raj D, Kumar A, Maiti SK. Brassica juncea (L.) Czern. (Indian mustard): a putative plant species to facilitate the phytoremediation of mercury contaminated soils. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2020; 22:733-744. [PMID: 31928218 DOI: 10.1080/15226514.2019.1708861] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A Phytoremediation experimental set up was established by spiking the soil with varying concentrations of mercury (Hg) (Treatment: T1:10; T2:50; T3:100; T4:500 and T5:1,000 mg Hg/kg soil). Hg removal ability of the Indian mustard plant was determined after 30, 60 and 90 days of exposure. Hg accumulation trend in second and third month of exposure was root > leaf > stem, while for the 1st month it was root > stem > leaf. The highest percentage of Hg accumulation (81%) and glutathione (14 mg/kg) was observed in the plants of T4 and T5 treatment, respectively at 90 days of exposure indicating a high level of Hg stress tolerance. At 90 days of exposure the chlorophyll a content in leaves grown on Hg-free soil (control soil) was 1.8, 2.4, 2.8, 3.6 and 4.4 fold higher than T1, T2, T3, T4 and T5 treatment respectively. With increase in exposure duration, translocation factor decreased whereas bioconcentration factor increased signifying Hg is mainly accumulated in the roots. The study suggests that Brassica juncea can withstand under high Hg contamination and can show great potential to phytostabilize Hg when grown under 100 mg/kg of soil Hg without showing any significant detrimental effect on the plant.
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Affiliation(s)
- Deep Raj
- Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - Adarsh Kumar
- Department of Experimental Biology and Biotechnology, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
| | - Subodh Kumar Maiti
- Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
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55
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Fu Y, Sun Y, Chen Z, Ying S, Wang J, Hu J. Functionalized magnetic mesoporous silica/poly(m-aminothiophenol) nanocomposite for Hg(II) rapid uptake and high catalytic activity of spent Hg(II) adsorbent. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 691:664-674. [PMID: 31325865 DOI: 10.1016/j.scitotenv.2019.07.153] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 07/10/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
Currently, magnetic mesoporous silica nanospheres have been employed widely as adsorbents due to their large surface area and easy recovery. Herein, the functionalized magnetic mesoporous silica/organic polymers nanocomposite (MMSP) was fabricated by the grafted poly(m-aminothiophenol) embedded the aminated magnetic mesoporous silica nanocomposite based on Fe3O4 magnetic core, which was shelled by mesoporous silica and further modified by (3-aminopropyl) triethoxysilane. The adsorption properties of as-developed MMSP were systematically explored by altering the experimental parameters. The results indicated that the adsorption capacity and removal percentage of the MMSP could reach 243.83 mg/g and 97.53% within only 10 min at pH 4.0, and the coexisting ions had no significant effect on the selective Hg(II) ions removal from aqueous solutions, meanwhile, the adsorbent recovered by a magnet still exhibited good adsorption performance after recycled 5 times. In addition, by analyzing experimental data, the adsorption process of Hg(II) ions belonged to spontaneous exothermic adsorption, and the possible adsorption mechanisms were proposed based on the pseudo-second-order model and Langmuir model. After adsorption study, the waste material adsorbed Hg(II) was developed as an efficient catalyst for transformation of phenylacetylene to acetophenone with yield of 97.06%. In this study, we designed an efficient and selective material for Hg(II) ions remove and provided a treatment of the post-adsorbed mercury adsorbent by converting the waste into an excellent catalyst, which reduced the economic and environmental impact from conventional adsorption techniques.
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Affiliation(s)
- Yong Fu
- Center for Molecular Science and Engineering, College of Sciences, Northeastern University, Shenyang 110819, PR China
| | - Yu Sun
- Center for Molecular Science and Engineering, College of Sciences, Northeastern University, Shenyang 110819, PR China
| | - Zhangpei Chen
- Center for Molecular Science and Engineering, College of Sciences, Northeastern University, Shenyang 110819, PR China
| | - Shaoming Ying
- Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, College of Chemistry and Materials, Ningde Normal University, PR China; Fujian Province University Engineering Research Center of Mindong She Medicine, College of Chemistry and Materials, Ningde Normal University, PR China
| | - Jiwei Wang
- Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, College of Chemistry and Materials, Ningde Normal University, PR China; Fujian Province University Engineering Research Center of Mindong She Medicine, College of Chemistry and Materials, Ningde Normal University, PR China.
| | - Jianshe Hu
- Center for Molecular Science and Engineering, College of Sciences, Northeastern University, Shenyang 110819, PR China.
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56
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Johs A, Eller VA, Mehlhorn TL, Brooks SC, Harper DP, Mayes MA, Pierce EM, Peterson MJ. Dissolved organic matter reduces the effectiveness of sorbents for mercury removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 690:410-416. [PMID: 31299573 DOI: 10.1016/j.scitotenv.2019.07.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 06/27/2019] [Accepted: 07/01/2019] [Indexed: 06/10/2023]
Abstract
Mercury (Hg) contamination of soils and sediments impacts numerous environments worldwide and constitutes a challenging remediation problem. In this study, we evaluate the impact of dissolved organic matter (DOM) on the effectiveness of eight sorbent materials considered for Hg remediation in soils and sediments. The materials include both engineered and unmodified materials based on carbon, clays, mesoporous silica and a copper alloy. Initially, we investigated the kinetics of Hg(II) complexation with DOM for a series of Hg:DOM ratios. Steady-state Hg-DOM complexation occurred within 48 to 120 h, taking longer time at higher Hg:DOC (dissolved organic carbon) molar ratios. In subsequent equilibrium experiments, Hg(II) was equilibrated with DOM at a defined Hg:DOC molar ratio (2.4 · 10-6) for 170 h and used in batch experiments to determine the effect of DOM on Hg partition coefficients and sorption isotherms by comparing Hg(II) and Hg-DOM. Hg sorption capacities of all sorbents were severely limited in the presence of DOM as a competing ligand. Thiol-SAMMS®, SediMite™ and pine biochar were most effective in reducing Hg concentrations. While pine biochar and lignin-derived carbon processed at high temperatures released negligible amounts of anions into solution, leaching of sulfate and chloride was observed for most engineered sorbent materials. Sulfate may stimulate microbial communities harboring sulfate reducing bacteria, which are considered one of the primary drivers of microbial mercury methylation in the environment. The results highlight potential challenges arising from the application of sorbents for Hg remediation in the field.
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Affiliation(s)
- Alexander Johs
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA.
| | - Virginia A Eller
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
| | - Tonia L Mehlhorn
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
| | - Scott C Brooks
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
| | - David P Harper
- Center for Renewable Carbon, University of Tennessee, 2506 Jacob Drive, Knoxville, TN 37996, USA
| | - Melanie A Mayes
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
| | - Eric M Pierce
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
| | - Mark J Peterson
- Environmental Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
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57
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Wang X, Yuan W, Lin CJ, Zhang L, Zhang H, Feng X. Climate and Vegetation As Primary Drivers for Global Mercury Storage in Surface Soil. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:10665-10675. [PMID: 31434480 DOI: 10.1021/acs.est.9b02386] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Soil is the largest Hg reservoir globally. Data of Hg concentration in surface soil are fundamental to understanding environmental Hg cycling. However, present knowledge on the quantity and global distribution of Hg in soil remains deficient. Using stable Hg isotopic analyses and geospatial data, the concentration and global spatial distribution of Hg in surface soil of 0-20 cm depth have been developed. It is estimated that 1088 ± 379 Gg of Hg is stored in surface soil globally. Thirty-two percent of the surface Hg storage resides in tropical/subtropical forest regions, 23% in temperate/boreal forest regions, 28% in grassland and steppe and shrubland, 7% in tundra, and 10% in desert and xeric shrubland. Evidence from Hg isotopic signatures points to atmospheric Hg0 dry deposition through vegetation uptake as the primary source of Hg in surface soil. Given the influence of changing climate on vegetative development, global climate change can act as an important forcing factor for shaping spatial distribution of Hg in surface soil. This active forcing cycle significantly dilutes the impacts caused by Hg release from anthropogenic sources, and needs to be considered in assessing the effectiveness of reducing Hg use and emissions as specified in Minamata Convention on Mercury.
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Affiliation(s)
- Xun Wang
- State Key Laboratory of Environmental Geochemistry , Institute of Geochemistry, Chinese Academy of Sciences , Guiyang 550081 , China
| | - Wei Yuan
- State Key Laboratory of Environmental Geochemistry , Institute of Geochemistry, Chinese Academy of Sciences , Guiyang 550081 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Che-Jen Lin
- Center for Advances in Water and Air Quality , Lamar University , Beaumont , Texas 77705 , United States
- Department of Civil and Environmental Engineering , Lamar University , Beaumont , Texas 77705 , United States
| | - Leiming Zhang
- Air Quality Research Division, Science and Technology Branch , Environment and Climate Change Canada , Toronto , Ontario M3H 5T4 , Canada
| | - Hui Zhang
- State Key Laboratory of Environmental Geochemistry , Institute of Geochemistry, Chinese Academy of Sciences , Guiyang 550081 , China
| | - Xinbin Feng
- State Key Laboratory of Environmental Geochemistry , Institute of Geochemistry, Chinese Academy of Sciences , Guiyang 550081 , China
- Center for Excellence in Quaternary Science and Global Change , Chinese Academy of Sciences , Xian 710061 , China
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58
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Chang J, Yang Q, Dong J, Ji B, Si G, He F, Li B, Chen J. Reduction in Hg phytoavailability in soil using Hg-volatilizing bacteria and biochar and the response of the native bacterial community. Microb Biotechnol 2019; 12:1014-1023. [PMID: 31241863 PMCID: PMC6681405 DOI: 10.1111/1751-7915.13457] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 04/23/2019] [Accepted: 06/14/2019] [Indexed: 01/02/2023] Open
Abstract
Biological approaches are considered promising and eco-friendly strategies to remediate Hg contamination in soil. This study investigated the potential of two 'green' additives, Hg-volatilizing bacteria (Pseudomonas sp. DC-B1 and Bacillus sp. DC-B2) and sawdust biochar, and their combination to reduce Hg(II) phytoavailability in soil and the effect of the additives on the soil bacterial community. The results showed that the Hg(II) contents in soils and lettuce shoots and roots were all reduced with these additives, achieving more declines of 12.3-27.4%, 24.8-57.8% and 2.0-48.6%, respectively, within 56 days of incubation compared to the control with no additive. The combination of DC-B2 and 4% biochar performed best in reducing Hg(II) contents in lettuce shoots, achieving a decrease of 57.8% compared with the control. Pyrosequencing analysis showed that the overall bacterial community compositions in the soil samples were similar under different treatments, despite the fact that the relative abundance of dominant genera altered with the additives, suggesting a relatively weak impact of the additives on the soil microbial ecosystem. The low relative abundances of Pseudomonas and Bacillus, close to the background levels, at the end of the experiment indicated a small biological disturbance of the local microbial niche by the exogenous bacteria.
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Affiliation(s)
- Junjun Chang
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Qingchen Yang
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Jia Dong
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Bohua Ji
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Guangzheng Si
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Fang He
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Benyan Li
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Jinquan Chen
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
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59
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Beckers F, Mothes S, Abrigata J, Zhao J, Gao Y, Rinklebe J. Mobilization of mercury species under dynamic laboratory redox conditions in a contaminated floodplain soil as affected by biochar and sugar beet factory lime. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 672:604-617. [PMID: 30970288 DOI: 10.1016/j.scitotenv.2019.03.401] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 03/21/2019] [Accepted: 03/25/2019] [Indexed: 06/09/2023]
Abstract
Mercury and its species are toxic and therefore strategies to immobilize them or to impede the formation of bioaccumulative MeHg are a hot topic of ongoing research. Biochar (BC) and sugar beet factory lime (SBFL) are suggested to have the potential to meet these goals. However, their ability to restrain the mobilization of total Hg (Hgt), methylmercury (MeHg), and ethylmercury (EtHg) or the formation of MeHg and EtHg has not been examined to date. Moreover, the effect of systematically altered redox conditions on the release dynamics of Hgt, MeHg, and EtHg in a contaminated floodplain soil as affected by these soil amendments has not been studied. Therefore, we investigated the impact of pre-defined redox conditions on the release dynamics of Hgt, MeHg, and EtHg in a contaminated floodplain soil (CS) and the soil amended with either BC (CS+BC) or SBFL (CS+SBFL). The mobilization of Hgt, MeHg, and EtHg was generally higher at low redox potential (EH) and decreased with increasing EH, irrespective of soil treatment. Both BC and SBFL diminished the release of Hgt from soil but not the methylation and ethylation of Hg. In CS+SBFL approximately half of Hgt was found in solution compared to CS. However, higher methylation efficiency (MeHg/Hgt ratio) was found in CS+SBFL counterbalancing this benefit. Abundances of specific phospholipid fatty acids suggest the presence of sulfate-reducing bacteria, which are considered as primary Hg methylators. The results indicate that both BC and SBFL have the potential to curtail the release of Hgt from inundated soils, while SBFL was more efficient. However, these amendments had no marked effect on the MeHg and EtHg concentrations. Therefore, further research should be conducted to identify soil additives that are capable to reduce the release and formation of these Hg species.
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Affiliation(s)
- Felix Beckers
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
| | - Sibylle Mothes
- UFZ Helmholtz Centre for Environmental Research, Department of Analytical Chemistry, Permoserstraße 15, 04318 Leipzig, Germany
| | - Jens Abrigata
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany
| | - Jiating Zhao
- CAS Key Laboratory of Nuclear Analytical Techniques, Key Lab for Biomedical Effects of Nanomaterial and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yuxi Gao
- CAS Key Laboratory of Nuclear Analytical Techniques, Key Lab for Biomedical Effects of Nanomaterial and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany; Department of Environment, Energy & Geoinformatics, Sejong University, 98 Gunja-Dong, Guangjin-Gu, Seoul, South Korea.
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60
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Nguyen TH, Sun T, Grattan KTV. A Turn-On Fluorescence-Based Fibre Optic Sensor for the Detection of Mercury. SENSORS (BASEL, SWITZERLAND) 2019; 19:E2142. [PMID: 31075827 PMCID: PMC6539747 DOI: 10.3390/s19092142] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/01/2019] [Accepted: 05/02/2019] [Indexed: 12/26/2022]
Abstract
The design, development, and evaluation of an optical fibre sensor for the detection of Hg2+ in aqueous media are discussed in detail in this paper. A novel fluorescent polymeric material for Hg2+ detection, based on a coumarin derivative (acting as the fluorophore) and an azathia crown ether moiety (acting as the mercury ion receptor), has been synthesized. The fluorophore was covalently immobilized onto the fibre surface by polymerisation using the ion imprinting technique and exhibited a significant increase in fluorescence intensity in response to Hg2+ via a photoinduced electron transfer (PET) mechanism. The sensor provided a response over a concentration range of 0-28 µM with an acceptable response rate of around 11 min and a recovery rate of around 30 min in a Tris-EDTA buffer solution. A detection limit of 0.15 µM was obtained with a possibility of improvement by changing the thickness of the polymer layer and using a more sensitive detector. High-quality performance is seen through a high selectivity for Hg2+ over other metal ions, excellent photo-stability and reversibility which was also demonstrated, making this type of sensor potentially well suited for in-situ monitoring of mercury in the environment.
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Affiliation(s)
- T Hien Nguyen
- Photonics and Instrumentation Research Centre, City University of London, London EC1V 0HB, UK.
| | - Tong Sun
- Photonics and Instrumentation Research Centre, City University of London, London EC1V 0HB, UK.
| | - Kenneth T V Grattan
- Photonics and Instrumentation Research Centre, City University of London, London EC1V 0HB, UK.
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Shetty D, Boutros S, Eskhan A, De Lena AM, Skorjanc T, Asfari Z, Traboulsi H, Mazher J, Raya J, Banat F, Trabolsi A. Thioether-Crown-Rich Calix[4]arene Porous Polymer for Highly Efficient Removal of Mercury from Water. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12898-12903. [PMID: 30852896 DOI: 10.1021/acsami.9b02259] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A rational design of adsorbents with high uptake efficiency and fast kinetics for highly toxic pollutants is a key challenge in environmental remediation. Here, we report the design of a well-defined thioether-crown-rich porous calix[4]arene-based mesoporous polymer S-CX4P and its utility in removal of highly relevant toxic mercury (Hg2+) from water. The polymer shows an exceptional, record-high uptake efficiency of 1686 mg g-1 and the fastest initial adsorption rate of 278 mg g-1 min-1. Remarkably, S-CX4P can effectively remove Hg2+ from high concentration (5 ppm) to below the acceptable limit for drinking water (2 ppb) even in the presence of other competitive metals at high concentrations. In addition, the polymer can be easily regenerated at room temperature and reused multiple times with negligible loss in uptake rate and efficiency. The results demonstrate the potential of rationally designed thioether-crown-rich polymers for high performance mercury removal.
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Affiliation(s)
- Dinesh Shetty
- Science Division , New York University Abu Dhabi (NYUAD) , P.O. Box 129188, Saadiyat Island, Abu Dhabi , UAE
| | - Sandra Boutros
- Science Division , New York University Abu Dhabi (NYUAD) , P.O. Box 129188, Saadiyat Island, Abu Dhabi , UAE
| | - Asma Eskhan
- Chemical Engineering Department , Khalifa University , P.O. Box 127788, Abu Dhabi , UAE
| | - Anna Marie De Lena
- Chemical Engineering Department , Khalifa University , P.O. Box 127788, Abu Dhabi , UAE
| | - Tina Skorjanc
- Science Division , New York University Abu Dhabi (NYUAD) , P.O. Box 129188, Saadiyat Island, Abu Dhabi , UAE
| | - Zouhair Asfari
- Equipe Synthèse Pour l'Analyse (SynPA), Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178 CNRS/UdS, 67087 Strasbourg Cedex, France
| | | | | | - Jesus Raya
- Membrane Biophysics and NMR, Institute of Chemistry, UMR 7177 , University of Strasbourg , 67000 Strasbourg , France
| | - Fawzi Banat
- Chemical Engineering Department , Khalifa University , P.O. Box 127788, Abu Dhabi , UAE
| | - Ali Trabolsi
- Science Division , New York University Abu Dhabi (NYUAD) , P.O. Box 129188, Saadiyat Island, Abu Dhabi , UAE
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Kinetic Analysis of the Thermal Decomposition of a Synthetic Mercury Jarosite. MINERALS 2019. [DOI: 10.3390/min9040200] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Jarosites are widely used in the hydrometallurgical industry of zinc to eliminate iron and other impurities contained in the concentrates. However, these compounds can also incorporate elements of significant environmental concern such as Tl+, Hg2+, Pb2+, Cd2+, Cr(VI), and As(V). In this work, the characterization of a synthetic mercury jarosite and its thermal decomposition kinetics are reported. XRD and FTIR analyses confirm that a mercury jarosite—Hg0.40(H3O)0.2]Fe2.71(SO4)2.17(OH)4.79(H2O)0.44—was successfully synthesized. Four mass loss events were observed by thermogravimetric analysis at 290 °C, 365 °C, 543 °C, and 665 °C. The third event corresponds to mercury decomposition into mercury oxide, whilst the forth is related to the jarosite to hematite transformation determined by X-ray diffraction starting at around 600 °C. According to the kinetic parameters (activation energy and frequency factor) of the thermal decomposition process, the fourth stage required the highest energy (Ea = 234.7 kJ∙mol−1), which corresponds to elimination of sulfur and oxygen from the jarosite lattice. Results show that jarosite-type compounds have the capability to incorporate heavy metals into their structure, retaining them even at high temperatures. Therefore, they can be used as a remediation strategy for heavy metals, such as mercury and others elements of environmental concern.
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63
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Iron Sulfide Minerals as Potential Active Capping Materials for Mercury-Contaminated Sediment Remediation: A Minireview. SUSTAINABILITY 2019. [DOI: 10.3390/su11061747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Several innovative approaches have been proposed in recent years to remediate contaminated sediment to reduce human health and environmental risk. One of the challenges of sediment remediation stems from its unfeasible high cost, especially when ex situ strategies are selected. Therefore, in situ methods such as active capping have been emerging as possible options for solving sediment problems. Active capping methods have been extensively tested in field-scale sediment remediation for organic pollutants (e.g., PCBs, PAHs, DDT) contamination with good sequestration efficiency; however, these methods have not been widely tested for control of heavy metal pollutants, such as mercury (Hg). In this review, the potentials of using iron sulfide minerals to sequestrate Hg were discussed. Iron sulfide minerals are common in the natural environment and have shown good effectiveness in sequestrating Hg by adsorption or precipitation. Iron sulfides can also be synthesized in a laboratory and modified to enhance their sequestration ability for Hg. Some of the potential advantages of iron sulfides are pointed out here. Additional tests to understand the possibility of applying iron sulfides as active caps to remediate complicated environment systems should be conducted.
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Han C, Wang H, Xie F, Wang W, Zhang T, Dreisinger D. Feasibility study on the use of thiosulfate to remediate mercury-contaminated soil. ENVIRONMENTAL TECHNOLOGY 2019; 40:813-821. [PMID: 29183254 DOI: 10.1080/09593330.2017.1408693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 11/18/2017] [Indexed: 06/07/2023]
Abstract
The feasibility of using sodium thiosulfate to remediate the mercury-contaminated soil around a local chemical plant in northeastern China has been investigated. Effects of solid-to-reagent ratio and temperature on mercury extraction from soil samples with thiosulfate solutions were examined. BCR (European Community Bureau of Reference) analysis indicated that more than 90% of weak acid soluble and reducible mercury in the soil sample could be extracted by thiosulfate solution. Mercury extraction kinetics can be described by the two-step first-order reaction model in which the readily extractable fraction and the less extractable fraction of mercury were associated with their own rate constants. Mercury extraction with thiosulfate solutions could be slightly promoted when the contaminated soil was pre-oxidized with hydrogen peroxide. The results suggest that thiosulfate is a potentially effective complexing lixiviant in mercury-contaminated soil remediation.
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Affiliation(s)
- Chao Han
- a School of Metallurgy , Northeastern University , Shenyang , People's Republic of China
| | - Hui Wang
- a School of Metallurgy , Northeastern University , Shenyang , People's Republic of China
| | - Feng Xie
- a School of Metallurgy , Northeastern University , Shenyang , People's Republic of China
| | - Wei Wang
- a School of Metallurgy , Northeastern University , Shenyang , People's Republic of China
| | - Ting'an Zhang
- a School of Metallurgy , Northeastern University , Shenyang , People's Republic of China
| | - David Dreisinger
- b Department of Materials Engineering , University of British Columbia , Vancouver , Canada
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65
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Lu J, Wu X, Li Y, Liang Y, Cui W. Facile Fabrication of 3D Graphene⁻Silica Hydrogel Composite for Enhanced Removal of Mercury Ions. NANOMATERIALS 2019; 9:nano9030314. [PMID: 30818745 PMCID: PMC6473818 DOI: 10.3390/nano9030314] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/15/2019] [Accepted: 02/20/2019] [Indexed: 11/26/2022]
Abstract
Adsorption is a highly promising and widely used approach to remove Hg(II) ions from contaminated water. The key to this technology is exploring the effective adsorbent. The three-dimensional (3D) graphene as reduced graphene oxide hydrogel (rGH)-encapsulated silica gel (SG-PEI/rGH) was prepared by a moderate chemical reduction strategy using ascorbic acid. This composite structure was characterized by FTIR, XRD, and SEM analysis and used as adsorbents for Hg(II) ions. Its adsorption capacity toward Hg(II) ions was 266 mg/g and increased about 32% compared with the silica gel because of reduced graphene oxide hydrogel (rGH). Mechanism study showed that the high adsorption ability was due to the formation of an N–Hg complex with multi-amino groups on the surface of polyethyleneimine-modified silica gel (SG-PEI) and the rapid diffusion of adsorbed ions attributed to the rGH network structure. This composite SG-PEI/rGH would be a promising material for the removal of Hg(II) ions.
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Affiliation(s)
- Jinrong Lu
- College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
| | - Xiaonan Wu
- College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
| | - Yao Li
- College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
| | - Yinghua Liang
- College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
| | - Wenquan Cui
- College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
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Mbanga O, Ncube S, Tutu H, Chimuka L, Cukrowska E. Mercury accumulation and biotransportation in wetland biota affected by gold mining. ENVIRONMENTAL MONITORING AND ASSESSMENT 2019; 191:186. [PMID: 30806796 DOI: 10.1007/s10661-019-7329-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 02/15/2019] [Indexed: 05/04/2023]
Abstract
Phytoremediation is a cost-effective, eco-friendly technology for the removal of metals from polluted areas. In this study, six different plant species (Datura stramonium, Phragmites australis, Persicaria lapathifolia, Melilotus alba, Panicum coloratum, and Cyperus eragrostis) growing in a gold mine contaminated wetland were investigated as potential phytoremediators of mercury. The accumulation of total mercury and methylmercury in plant tissues was determined during the wet and dry seasons to establish the plants' variability in accumulation. The highest accumulation of total mercury was in the tissues of Phragmites australis with recorded concentrations of 806, 495, and 833 μg kg-1 in the roots, stem, and leaves, respectively, during the dry season. The lowest accumulation levels were recorded for Melilotus alba during both seasons. The highest amount of the methylmercury was found in Phragmites australis during the dry season with a value of 618 μg kg-1. The accumulation and biotransportation were not significantly different between the seasons for some plants. The results of this study indicated that plants growing in wetlands can be used for phytoremediation of mercury and suggest the choice of species for constructed wetlands.
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Affiliation(s)
- Odwa Mbanga
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg, 2050, South Africa
| | - Somandla Ncube
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg, 2050, South Africa
| | - Hlanganani Tutu
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg, 2050, South Africa
| | - Luke Chimuka
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg, 2050, South Africa
| | - Ewa Cukrowska
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg, 2050, South Africa.
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67
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Naguib MM, Khairalla AS, El-Gendy AO, Elkhatib WF. Isolation and characterization of mercury-resistant bacteria from wastewater sources in Egypt. Can J Microbiol 2019; 65:308-321. [PMID: 30633555 DOI: 10.1139/cjm-2018-0379] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An important mechanism for microbial resistance to mercury is its reduction into elemental mercury (facilitated by the merA gene). Thirty-eight microbial isolates from a variety of wastewater sources in Egypt were collected. Approximately 14 of the 38 isolates exhibited not only a high degree of tolerance to mercury (up to 160 ppm) but also a high degree of resistance to other tested heavy metals (Cu, Co, Ni, and Zn). From these 14, the 10 most resistant isolates were selected for further study and were found to include 9 Gram-negative and 1 Gram-positive bacterial strains. Multi-antibiotic-resistance profiles were detected for 6 out of the 10 selected isolates. All the tested Gram-negative isolates (n = 9) harbored a plasmid-encoded merA gene. The mercury removal effectiveness for the 10 selected isolates ranged between 50% and 99.9%, among which Stenotrophomonas maltophilia ADW10 recorded the highest rate (99.9%; at an initial mercury concentration of 20 ppm). To the best of our knowledge, this is the first study to (i) demonstrate the presence of a multimetal-resistant S. maltophilia bacterium with a high mercury tolerance capacity that would make it a suitable candidate for future bioremediation efforts in heavy-metal-polluted areas in Egypt and (ii) report Pseudomonas otitidis as one of the mercury-resistant bacteria.
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Affiliation(s)
- Martha M Naguib
- a Department of Biotechnology and Life Sciences, Faculty of Post Graduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef, Egypt
| | - Ahmed S Khairalla
- b Department of Microbiology & Immunology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Ahmed O El-Gendy
- b Department of Microbiology & Immunology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Walid F Elkhatib
- c Department of Microbiology & Immunology, Faculty of Pharmacy, Ain Shams University, African Union Organization St., Abbassia 11566, Cairo, Egypt.,d Department of Microbiology and Immunology, School of Pharmacy & Pharmaceutical Industries, Badr University in Cairo, Entertainment Area, Badr City, Cairo, Egypt
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68
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Adverse effect of heavy metals (As, Pb, Hg, and Cr) on health and their bioremediation strategies: a review. Int Microbiol 2018; 21:97-106. [DOI: 10.1007/s10123-018-0012-3] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 05/23/2018] [Accepted: 05/28/2018] [Indexed: 01/23/2023]
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Esdaile LJ, Chalker JM. The Mercury Problem in Artisanal and Small-Scale Gold Mining. Chemistry 2018; 24:6905-6916. [PMID: 29314284 PMCID: PMC5969110 DOI: 10.1002/chem.201704840] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Indexed: 11/11/2022]
Abstract
Mercury-dependent artisanal and small-scale gold mining (ASGM) is the largest source of mercury pollution on Earth. In this practice, elemental mercury is used to extract gold from ore as an amalgam. The amalgam is typically isolated by hand and then heated-often with a torch or over a stove-to distill the mercury and isolate the gold. Mercury release from tailings and vaporized mercury exceed 1000 tonnes each year from ASGM. The health effects on the miners are dire, with inhaled mercury leading to neurological damage and other health issues. The communities near these mines are also affected due to mercury contamination of water and soil and subsequent accumulation in food staples, such as fish-a major source of dietary protein in many ASGM regions. The risks to children are also substantial, with mercury emissions from ASGM resulting in both physical and mental disabilities and compromised development. Between 10 and 19 million people use mercury to mine for gold in more than 70 countries, making mercury pollution from ASGM a global issue. With the Minamata Convention on Mercury entering force this year, there is political motivation to help overcome the problem of mercury in ASGM. In this effort, chemists can play a central role. Here, the problem of mercury in ASGM is reviewed with a discussion on how the chemistry community can contribute solutions. Introducing portable and low-cost mercury sensors, inexpensive and scalable remediation technologies, novel methods to prevent mercury uptake in fish and food crops, and efficient and easy-to-use mercury-free mining techniques are all ways in which the chemistry community can help. To meet these challenges, it is critical that new technologies or techniques are low-cost and adaptable to the remote and under-resourced areas in which ASGM is most common. The problem of mercury pollution in ASGM is inherently a chemistry problem. We therefore encourage the chemistry community to consider and address this issue that affects the health of millions of people.
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Affiliation(s)
- Louisa J. Esdaile
- Centre for NanoScale Science and Technology, College of Science and EngineeringFlinders UniversitySturt RoadBedford Park, South AustraliaAustralia
| | - Justin M. Chalker
- Centre for NanoScale Science and Technology, College of Science and EngineeringFlinders UniversitySturt RoadBedford Park, South AustraliaAustralia
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70
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Zhang Q, Wang S, Nan Z, Li Y, Zang F. Accumulation, fractionation, and risk assessment of mercury and arsenic in the soil-wheat system from the wastewater-irrigated soil in Baiyin, northwest China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:14856-14867. [PMID: 29546511 DOI: 10.1007/s11356-018-1641-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 02/28/2018] [Indexed: 06/08/2023]
Abstract
Wastewater irrigation can increase metal concentrations in soil and wheat, thereby posing metal-associated health risk via food ingestion. We investigated levels of mercury (Hg) and arsenic (As) in roots, husks, stems, leaves, and grains of wheat and their fractionations in farmland soil from Baiyin City, an industrial and mining city, northwest China. Results show that the mean concentrations of Hg in soils from Dongdagou and Xidagou stream in Baiyin were 8.5 times and three times higher than local soil background values, respectively. Those of As were 4.5 times and 1.6 times higher, respectively. Most Hg and As were mainly accumulated in wheat leaves. The spatial distributions of As in soils and grains exhibit a very similar pattern, which suggest that As pollution in soils might be predicted by its level in wheat grains. Residual fractions for Hg (RES-Hg) and As (RES-As) are the highest compared to other fractions, indicating weak mobility of Hg and As in soil. The crop oral intake hazard quotients of both Hg and As for children were approximately two times higher than that for adults, indicating that children have higher exposure risks to Hg- and As-contaminated wheat. The crop oral intake was the main route of exposure causing non-carcinogenic and carcinogenic risk for local residents.
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Affiliation(s)
- Qian Zhang
- Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, Gansu Province, 730000, China
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000, Gansu Province, China
| | - Shengli Wang
- Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, Gansu Province, 730000, China.
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000, Gansu Province, China.
| | - Zhongren Nan
- Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, Gansu Province, 730000, China
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000, Gansu Province, China
| | - Yepu Li
- Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, Gansu Province, 730000, China
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000, Gansu Province, China
| | - Fei Zang
- Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, Gansu Province, 730000, China
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou, 730000, Gansu Province, China
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71
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Naguib MM, El-Gendy AO, Khairalla AS. Microbial Diversity of Mer Operon Genes and Their Potential Rules in Mercury Bioremediation and Resistance. ACTA ACUST UNITED AC 2018. [DOI: 10.2174/1874070701812010056] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:Mercury is a toxic metal that is present in small amounts in the environment, but its level is rising steadily, due to different human activities, such as industrialization. It can reach humans through the food chain, amalgam fillings, and other sources, causing different neurological disorders, memory loss, vision impairment, and may even lead to death; making its detoxification an urgent task.Methods:Various physical and chemical mercury remediation techniques are available, which generally aim at: (i) reducing its mobility or solubility; (ii) causing its vaporization or condensation; (iii) its separation from contaminated soils. Biological remediation techniques, commonly known as bioremediation, are also another possible alternative, which is considered as cheaper than the conventional means and can be accomplished using either (i) organisms harboring themeroperon genes (merB,merA,merR,merP,merT,merD,merF,merC,merE,merHandmerG), or (ii) plants expressing metal-binding proteins. Recently, differentmerdeterminants have been genetically engineered into several organisms, including bacteria and plants, to aid in detoxification of both ionic and organic forms of mercury.Results:Bacteria that are resistant to mercury compounds have at least a mercuric reductase enzyme (MerA) that reduces Hg+2to volatile Hg0, a membrane-bound protein (MerT) for Hg+2uptake and an additional enzyme, MerB, that degrades organomercurials by protonolysis. Presence of bothmerA andmerB genes confer broad-spectrum mercury resistance. However,merA alone confers narrow spectrum inorganic mercury resistance.Conclusion:To conclude, this review discusses the importance of mercury-resistance genes in mercury bioremediation. Functional analysis ofmeroperon genes and the recent advances in genetic engineering techniques could provide the most environmental friendly, safe, effective and fantastic solution to overcome mercuric toxicity.
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72
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Opiso EM, Aseneiro JPJ, Banda MHT, Tabelin CB. Solid-phase partitioning of mercury in artisanal gold mine tailings from selected key areas in Mindanao, Philippines, and its implications for mercury detoxification. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2018; 36:269-276. [PMID: 29378500 DOI: 10.1177/0734242x17753534] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The solid-phase partitioning of mercury could provide necessary data in the identification of remediation techniques in contaminated artisanal gold mine tailings. This study was conducted to determine the total mercury content of mine wastes and identify its solid-phase partitioning through selective sequential extraction coupled with cold vapour atomic absorption spectroscopy. Samples from mine tailings and the carbon-in-pulp (CIP) process were obtained from selected key areas in Mindanao, Philippines. The results showed that mercury use is still prevalent among small-scale gold miners in the Philippines. Tailings after ball mill-gravity concentration (W-BM and Li-BM samples) from Mt Diwata and Libona contained high levels of mercury amounting to 25.024 and 6.5 mg kg-1, respectively. The most prevalent form of mercury in the mine tailings was elemental/amalgamated mercury, followed by water soluble, exchangeable, organic and strongly bound phases, respectively. In contrast, mercury content of carbon-in-pulp residues were significantly lower at only 0.3 and 0.06 mg kg-1 for P-CIP (Del Pilar) and W-CIP (Mt Diwata), respectively. The bulk of mercury in P-CIP samples was partitioned in residual fraction while in W-CIP samples, water soluble mercury predominated. Overall, this study has several important implications with regards to mercury detoxification of contaminated mine tailings from Mindanao, Philippines.
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Affiliation(s)
- Einstine M Opiso
- 1 Geoenvironmental Engineering Group, Central Mindanao University, Bukidnon, Philippines
| | - John Paul J Aseneiro
- 2 Material Science Research Group, Central Mindanao University, Bukidnon, Philippines
| | - Marybeth Hope T Banda
- 1 Geoenvironmental Engineering Group, Central Mindanao University, Bukidnon, Philippines
| | - Carlito B Tabelin
- 3 Division of Sustainable Resources Engineering, Hokkaido University, Sapporo, Japan
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73
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Worthington MJH, Kucera RL, Albuquerque IS, Gibson CT, Sibley A, Slattery AD, Campbell JA, Alboaiji SFK, Muller KA, Young J, Adamson N, Gascooke JR, Jampaiah D, Sabri YM, Bhargava SK, Ippolito SJ, Lewis DA, Quinton JS, Ellis AV, Johs A, Bernardes GJL, Chalker JM. Laying Waste to Mercury: Inexpensive Sorbents Made from Sulfur and Recycled Cooking Oils. Chemistry 2017; 23:16219-16230. [PMID: 28763123 PMCID: PMC5724514 DOI: 10.1002/chem.201702871] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Indexed: 11/07/2022]
Abstract
Mercury pollution threatens the environment and human health across the globe. This neurotoxic substance is encountered in artisanal gold mining, coal combustion, oil and gas refining, waste incineration, chloralkali plant operation, metallurgy, and areas of agriculture in which mercury-rich fungicides are used. Thousands of tonnes of mercury are emitted annually through these activities. With the Minamata Convention on Mercury entering force this year, increasing regulation of mercury pollution is imminent. It is therefore critical to provide inexpensive and scalable mercury sorbents. The research herein addresses this need by introducing low-cost mercury sorbents made solely from sulfur and unsaturated cooking oils. A porous version of the polymer was prepared by simply synthesising the polymer in the presence of a sodium chloride porogen. The resulting material is a rubber that captures liquid mercury metal, mercury vapour, inorganic mercury bound to organic matter, and highly toxic alkylmercury compounds. Mercury removal from air, water and soil was demonstrated. Because sulfur is a by-product of petroleum refining and spent cooking oils from the food industry are suitable starting materials, these mercury-capturing polymers can be synthesised entirely from waste and supplied on multi-kilogram scales. This study is therefore an advance in waste valorisation and environmental chemistry.
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Affiliation(s)
- Max J. H. Worthington
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Renata L. Kucera
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Inês S. Albuquerque
- Instituto de Medicina MolecularFaculdade de Medicina da Universidade de LisboaLisbonPortugal
| | - Christopher T. Gibson
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Alexander Sibley
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Ashley D. Slattery
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Jonathan A. Campbell
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Salah F. K. Alboaiji
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Katherine A. Muller
- Environmental Sciences DivisionOak Ridge National LaboratoryOak RidgeTennesseeUSA
| | - Jason Young
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Flinders Analytical, School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Nick Adamson
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
- School of Chemical and Biomedical EngineeringUniversity of MelbourneParkvilleVictoriaAustralia
| | - Jason R. Gascooke
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of ScienceRMIT UniversityMelbourneVictoriaAustralia
| | - Ylias M. Sabri
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of ScienceRMIT UniversityMelbourneVictoriaAustralia
| | - Suresh K. Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of ScienceRMIT UniversityMelbourneVictoriaAustralia
| | - Samuel J. Ippolito
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of ScienceRMIT UniversityMelbourneVictoriaAustralia
- School of EngineeringRMIT UniversityMelbourneVictoriaAustralia
| | - David A. Lewis
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Jamie S. Quinton
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
| | - Amanda V. Ellis
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
- School of Chemical and Biomedical EngineeringUniversity of MelbourneParkvilleVictoriaAustralia
| | - Alexander Johs
- Environmental Sciences DivisionOak Ridge National LaboratoryOak RidgeTennesseeUSA
| | - Gonçalo J. L. Bernardes
- Instituto de Medicina MolecularFaculdade de Medicina da Universidade de LisboaLisbonPortugal
- Department of ChemistryUniversity of CambridgeCambridgeUnited Kingdom
| | - Justin M. Chalker
- School of Chemical and Physical SciencesFlinders UniversityBedford ParkSouth AustraliaAustralia
- Centre for NanoScale Science and TechnologyFlinders UniversityBedford ParkSouth AustraliaAustralia
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74
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Evaluation of Energy Consumption in the Mercury Treatment of Phosphor Powder from Spent Fluorescent Lamps Using a Thermal Process. SUSTAINABILITY 2017. [DOI: 10.3390/su9112013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In a pilot-plant-scale thermal mercury treatment of phosphor powder from spent fluorescent lamps, energy consumption was estimated to control mercury content by the consideration of reaction kinetics. Mercury content was analyzed as a function of treatment temperature and time. The initial mercury content of the phosphor powder used in the thermal process was approximately 3500 mg/kg. The target mercury content in the phosphor powder thermal process of the phosphor powder was 5 mg/kg or less at 400 °C or higher because the target mercury content was recommended by Minamata Convention and Basel Convention. During thermal processing, the reaction rate was represented by a first order reaction with the Arrhenius equation. The reaction rate constant increased with temperature from 0.0112 min−1 at 350 °C to 0.0558 min−1 at 600 °C. The frequency factor was 2.51 min−1, and the activation energy was 6509.11 kcal/kg. Reaction rate constants were used to evaluate the treatment time required to reduce mercury content in phosphor powder to be less than 5 mg/kg. The total energy consumption in a pilot-plant-scale thermal process was evaluated to determine the optimal temperature for removing mercury in phosphor powder.
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75
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Ding X, Wang R, Li Y, Gan Y, Liu S, Dai J. Insights into the mercury(II) adsorption and binding mechanism onto several typical soils in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:23607-23619. [PMID: 28856565 DOI: 10.1007/s11356-017-9835-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/25/2017] [Indexed: 06/07/2023]
Abstract
To better understand the Hg(II) adsorption by some typical soils and explore the insights about the binding between Hg(II) and soils, a batch of adsorption and characteristic experiments was conducted. Results showed that Hg(II) adsorption was well fitted by the Langmuir and Freundlich. The maximum adsorption amount of cinnamon soil (2094.73 mg kg-1) was nearly tenfold as much as that of saline soil (229.49 mg kg-1). The specific adsorption of Hg(II) on four soil surface was confirmed by X-ray photoelectron spectroscopy (XPS) owing to the change of elemental bonding energy after adsorption. However, the specific adsorption is mainly derived from some substances in the soil. Fourier transform infrared spectroscopy (FTIR) demonstrated that multiple oxygen-containing functional groups (O-H, C=O, and C-O) were involved in the Hg(II) adsorption, and the content of oxygen functional groups determined the adsorption capacity of the soil. Meanwhile, scanning electron microscopy combined with X-ray energy dispersive spectrometer (SEM-EDS) more intuitive revealed the binding of mercury to organic matter, metal oxides, and clay minerals in the soil and fundamentally confirmed the results of XPS and FTIR to further elucidate adsorptive phenomena. The complexation with oxygen-containing functional groups and the precipitation with minerals were likely the primary mechanisms for Hg(II) adsorption on several typical soils. This study is critical in understanding the transportation of Hg(II) in different soils and discovering potential preventative measures.
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Affiliation(s)
- Xiuhong Ding
- Environment Research Institute, Shandong University, Jinan, 250100, China
| | - Renqing Wang
- Environment Research Institute, Shandong University, Jinan, 250100, China
- School of Life Science, Shandong University, Jinan, 250100, China
| | - Yuncong Li
- Department of Soil and Water Science, Tropical Research and Education Center, University of Florida, Homestead, FL, 33031, USA
| | - Yandong Gan
- Environment Research Institute, Shandong University, Jinan, 250100, China
| | - Shuwei Liu
- School of Life Science, Shandong University, Jinan, 250100, China
| | - Jiulan Dai
- Environment Research Institute, Shandong University, Jinan, 250100, China.
- School of Life Science, Shandong University, Jinan, 250100, China.
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76
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Ordoñez S, Flores MU, Patiño F, Reyes IA, Islas H, Reyes M, Méndez E, Palacios EG. Kinetic Analysis of the Decomposition Reaction of the Mercury Jarosite in NaOH Medium. INT J CHEM KINET 2017. [DOI: 10.1002/kin.21116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sayra Ordoñez
- Área Académica de Ciencias de la Tierra y Materiales; Universidad Autónoma del Estado de Hidalgo; 42184 Hidalgo México
| | - Mizraim U. Flores
- Área de Electromecánica Industrial; Universidad Tecnológica de Tulancingo; 43642 Tulancingo Hidalgo México
| | - Francisco Patiño
- Ingeniería en Energía; Universidad Politécnica Metropolitana de Hidalgo; 43860 Tulancingo, Tolcayuca Hidalgo México
| | - Iván A. Reyes
- Catedrático CONACYT-Instituto de Metalurgia; Universidad Autónoma de San Luis Potosí; 78210 San Luis Potosí S.L.P. México
| | - Hernán Islas
- Área Académica de Ciencias de la Tierra y Materiales; Universidad Autónoma del Estado de Hidalgo; 42184 Hidalgo México
| | - Martín Reyes
- Área Académica de Ciencias de la Tierra y Materiales; Universidad Autónoma del Estado de Hidalgo; 42184 Hidalgo México
| | - Eliecer Méndez
- Área Académica de Ciencias de la Tierra y Materiales; Universidad Autónoma del Estado de Hidalgo; 42184 Hidalgo México
| | - Elia G. Palacios
- Departamento de Ingeniería en Metalurgia y Materiales; ESIQIE-IPN, UPALM; 07738 México, D.F. México
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77
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Smolinska B, Leszczynska J. Photosynthetic pigments and peroxidase activity of Lepidium sativum L. during assisted Hg phytoextraction. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:13384-13393. [PMID: 28386894 PMCID: PMC5434162 DOI: 10.1007/s11356-017-8951-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/27/2017] [Indexed: 05/30/2023]
Abstract
The study was conducted to evaluate metabolic answer of Lepidium sativum L. on Hg, compost, and citric acid during assisted phytoextraction. The chlorophyll a and b contents, total carotenoids, and activity of peroxidase were determined in plants exposed to Hg and soil amendments. Hg accumulation in plant shoots was also investigated. The pot experiments were provided in soil artificially contaminated by Hg and/or supplemented with compost and citric acid. Hg concentration in plant shoots and soil substrates was determined by cold vapor atomic absorption spectroscopy (CV-AAS) method after acid mineralization. The plant photosynthetic pigments and peroxidase activity were measured by standard spectrophotometric methods. The study shows that L. sativum L. accumulated Hg in its aerial tissues. An increase in Hg accumulation was noticed when soil was supplemented with compost and citric acid. Increasing Hg concentration in plant shoots was correlated with enhanced activation of peroxidase activity and changes in total carotenoid concentration. Combined use of compost and citric acid also decreased the chlorophyll a and b contents in plant leaves. Presented study reveals that L. sativum L. is capable of tolerating Hg and its use during phytoextraction assisted by combined use of compost and citric acid lead to decreasing soil contamination by Hg.
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Affiliation(s)
- Beata Smolinska
- Department of Biotechnology and Food Sciences, Institute of General Food Chemistry, Lodz University of Technology, 4/10 Stefanowskiego Str, 90-924, Lodz, Poland.
| | - Joanna Leszczynska
- Department of Biotechnology and Food Sciences, Institute of General Food Chemistry, Lodz University of Technology, 4/10 Stefanowskiego Str, 90-924, Lodz, Poland
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78
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Shen J, Ren C, Zeng H. Surprisingly High Selectivity and High Affinity in Mercury Recognition by H-Bonded Cavity-Containing Aromatic Foldarands. J Am Chem Soc 2017; 139:5387-5396. [PMID: 28151660 DOI: 10.1021/jacs.6b13342] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the absence of macrocyclic ring constraints, few synthetic systems, possessing a mostly solvent-independent well-folded conformation that is predisposed for highly selective and high affinity recognition of metal ions, have been demonstrated. We report here such a unique class of conformationally robust modularly tunable folding molecules termed foldarands that can recognize Hg2+ ions surprisingly well over 22 other metal ions. Despite the lack of sulfur atoms and having only oxygen-donor atoms in its structure, the best foldarand molecule, i.e., tetramer 4, exhibits a selectivity factor of at least 19 in differentiating the most tightly bound Hg2+ ion from all other metal ions, and a binding capacity that is ≥18 times that of thio-crown ethers. These two noteworthy binding characters make possible low level removal of Hg2+ ions. With a [4]:[Hg2+] molar ratio of 5:1 and a single biphasic solvent extraction, the concentration of Hg2+ ions could be reduced drastically by 98% (from 200 to 4 ppb) in pure water. 4 could also effect a highly efficient reduction in mercury content by 98% (from 500 to 10 ppb) in artificial groundwater via multiple successive extractions with an overall consumption of 4 being 9:1 in terms of [4]:[Hg2+] molar ratio.
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Affiliation(s)
- Jie Shen
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos, Singapore 138669
| | - Changliang Ren
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos, Singapore 138669
| | - Huaqiang Zeng
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos, Singapore 138669
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79
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Ayangbenro AS, Babalola OO. A New Strategy for Heavy Metal Polluted Environments: A Review of Microbial Biosorbents. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2017; 14:ijerph14010094. [PMID: 28106848 PMCID: PMC5295344 DOI: 10.3390/ijerph14010094] [Citation(s) in RCA: 528] [Impact Index Per Article: 75.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/26/2016] [Accepted: 01/13/2017] [Indexed: 01/29/2023]
Abstract
Persistent heavy metal pollution poses a major threat to all life forms in the environment due to its toxic effects. These metals are very reactive at low concentrations and can accumulate in the food web, causing severe public health concerns. Remediation using conventional physical and chemical methods is uneconomical and generates large volumes of chemical waste. Bioremediation of hazardous metals has received considerable and growing interest over the years. The use of microbial biosorbents is eco-friendly and cost effective; hence, it is an efficient alternative for the remediation of heavy metal contaminated environments. Microbes have various mechanisms of metal sequestration that hold greater metal biosorption capacities. The goal of microbial biosorption is to remove and/or recover metals and metalloids from solutions, using living or dead biomass and their components. This review discusses the sources of toxic heavy metals and describes the groups of microorganisms with biosorbent potential for heavy metal removal.
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Affiliation(s)
- Ayansina Segun Ayangbenro
- Food Security and Safety Niche Area, Faculty of Agriculture, Science and Technology, North-West University, Private Bag X2046, Mmabatho 2735, South Africa.
| | - Olubukola Oluranti Babalola
- Food Security and Safety Niche Area, Faculty of Agriculture, Science and Technology, North-West University, Private Bag X2046, Mmabatho 2735, South Africa.
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80
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Singh RP, Manchanda G, Li ZF, Rai AR. Insight of Proteomics and Genomics in Environmental Bioremediation. ACTA ACUST UNITED AC 2017. [DOI: 10.4018/978-1-5225-2325-3.ch003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
Bioremediation of hazardous substances from environment is a major human and environmental health concern but can be managed by the microorganism due to their variety of properties that can effectively change the complexity. Microorganisms convey endogenous genetic, biochemical and physiological assets that make them superlative proxies for pollutant remediation in habitat. But, the crucial step is to degrade the complex ring structured pollutants. Interestingly, the integration of genomics and proteomics technologies that allow us to use or alter the genes and proteins of interest in a given microorganism towards a cell-free bioremediation approach. Resultantly, efforts have been finished by developing the genetically modified (Gm) microbes for the remediation of ecological contaminants. Gm microorganisms mediated bioremediation can affect the solubility, bioavailability and mobility of complex hazardous.
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81
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Rodríguez L, Alonso-Azcárate J, Villaseñor J, Rodríguez-Castellanos L. EDTA and hydrochloric acid effects on mercury accumulation by Lupinus albus. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:24739-24748. [PMID: 27658402 DOI: 10.1007/s11356-016-7680-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
The efficiency of white lupine (Lupinus albus) to uptake and accumulate mercury from a soil polluted by mining activities was assessed in a pot experiment with chemically assisted phytoextraction. The mobilizing agents tested were ethylenediaminetetracetic acid (EDTA) and hydrochloric acid (HCl). Two doses of each amendment were used (0.5 and 1.0 g of amendment per kg of soil), and unamended pots were used as a control. Addition of HCl to the soil did not negatively affect plant biomass, while the use of EDTA led to a significant decrease in plant growth when compared to that found for non-treated pots, with plants visually showing symptoms of toxicity. The addition of hydrochloric acid increased root, shoot and total plant Hg uptake of white lupine by 3.7 times, 3.1 times and 3.5 times, respectively, in relation to non-amended plants. The greatest efficiency was obtained for the highest HCl dose. EDTA led to higher concentrations of total plant Hg than that found with the control, but, due to the aforementioned decrease in plant biomass, the Hg phytoextraction yield was not significantly increased. These results were attributed to the capability of both amendments to form stable Hg complexes. The concentration of Hg in the water of the soil pores after the phytoextraction experiment was very low for all treatments, showing that risks derived from metal leaching could be partially avoided by using doses and chemicals suitable to the concentration of metal in the soil and plant performance.
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Affiliation(s)
- Luis Rodríguez
- Department of Chemical Engineering, School of Civil Engineering, University of Castilla-La Mancha, Avenida Camilo José Cela, s/n, 13071, Ciudad Real, Spain.
| | - Jacinto Alonso-Azcárate
- Department of Physical Chemistry, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avenida Carlos III, s/n, 45071, Toledo, Spain
| | - José Villaseñor
- Department of Chemical Engineering, Institute of Chemical and Environmental Technologies (ITQUIMA), University of Castilla-La Mancha, Avenida Camilo José Cela, s/n, 13071, Ciudad Real, Spain
| | - Laura Rodríguez-Castellanos
- Department of Chemical Engineering, School of Civil Engineering, University of Castilla-La Mancha, Avenida Camilo José Cela, s/n, 13071, Ciudad Real, Spain
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82
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Azubuike CC, Chikere CB, Okpokwasili GC. Bioremediation techniques-classification based on site of application: principles, advantages, limitations and prospects. World J Microbiol Biotechnol 2016; 32:180. [PMID: 27638318 PMCID: PMC5026719 DOI: 10.1007/s11274-016-2137-x] [Citation(s) in RCA: 306] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/08/2016] [Indexed: 11/17/2022]
Abstract
Environmental pollution has been on the rise in the past few decades owing to increased human activities on energy reservoirs, unsafe agricultural practices and rapid industrialization. Amongst the pollutants that are of environmental and public health concerns due to their toxicities are: heavy metals, nuclear wastes, pesticides, green house gases, and hydrocarbons. Remediation of polluted sites using microbial process (bioremediation) has proven effective and reliable due to its eco-friendly features. Bioremediation can either be carried out ex situ or in situ, depending on several factors, which include but not limited to cost, site characteristics, type and concentration of pollutants. Generally, ex situ techniques apparently are more expensive compared to in situ techniques as a result of additional cost attributable to excavation. However, cost of on-site installation of equipment, and inability to effectively visualize and control the subsurface of polluted sites are of major concerns when carrying out in situ bioremediation. Therefore, choosing appropriate bioremediation technique, which will effectively reduce pollutant concentrations to an innocuous state, is crucial for a successful bioremediation project. Furthermore, the two major approaches to enhance bioremediation are biostimulation and bioaugmentation provided that environmental factors, which determine the success of bioremediation, are maintained at optimal range. This review provides more insight into the two major bioremediation techniques, their principles, advantages, limitations and prospects.
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Affiliation(s)
- Christopher Chibueze Azubuike
- Department of Microbiology, Faculty of Science, University of Port Harcourt, East-West Road, PMB 5323, Choba, Port Harcourt, 500004, Rivers State, Nigeria.
| | - Chioma Blaise Chikere
- Department of Microbiology, Faculty of Science, University of Port Harcourt, East-West Road, PMB 5323, Choba, Port Harcourt, 500004, Rivers State, Nigeria
| | - Gideon Chijioke Okpokwasili
- Department of Microbiology, Faculty of Science, University of Port Harcourt, East-West Road, PMB 5323, Choba, Port Harcourt, 500004, Rivers State, Nigeria
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83
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Gold and silver nanoparticles and indicator dyes as active agents in colorimetric spot and strip tests for mercury(II) ions: a review. Mikrochim Acta 2016. [DOI: 10.1007/s00604-016-1967-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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84
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85
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Vogel C, Krüger O, Herzel H, Amidani L, Adam C. Chemical state of mercury and selenium in sewage sludge ash based P-fertilizers. JOURNAL OF HAZARDOUS MATERIALS 2016; 313:179-184. [PMID: 27060867 DOI: 10.1016/j.jhazmat.2016.03.079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 03/18/2016] [Accepted: 03/27/2016] [Indexed: 06/05/2023]
Abstract
Phosphorus-fertilizers from secondary resources such as sewage sludge ash (SSA) will become more important in the future as they could substitute conventional fertilizers based on the nonrenewable resource phosphate rock. Thermochemical approaches were developed which remove heavy metals from SSA prior to its fertilizer application on farmlands. We analyzed the chemical state of mercury and selenium in SSA before and after thermochemical treatment under different conditions for P-fertilizer production by X-ray absorption near edge structure (XANES) spectroscopy. In some incineration plants the mercury loaded carbon adsorber from off-gas cleaning was collected together with the SSA for waste disposal. SSAs from those plants contained mercury mainly bound to carbon/organic material. The other SSAs contained inorganic mercury compounds which are most probably stabilized in the SSA matrix and were thus not evaporated during incineration. During thermochemical treatment, carbon-bound mercury was removed quantitatively. In contrast, a certain immobile fraction of inorganic mercury compounds remained in thermochemically treated SSA, which were not clearly identified. HgSe might be one of the inorganic compounds, which is supported by results of Se K-edge XANES spectroscopy. Furthermore, the chemical state of selenium in the SSAs was very sensitive to the conditions of the thermochemical treatment.
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Affiliation(s)
- Christian Vogel
- Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
| | - Oliver Krüger
- Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Hannes Herzel
- Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Lucia Amidani
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Christian Adam
- Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
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86
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Limmer M, Burken J. Phytovolatilization of Organic Contaminants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:6632-43. [PMID: 27249664 DOI: 10.1021/acs.est.5b04113] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Plants can interact with a variety of organic compounds, and thereby affect the fate and transport of many environmental contaminants. Volatile organic compounds may be volatilized from stems or leaves (direct phytovolatilization) or from soil due to plant root activities (indirect phytovolatilization). Fluxes of contaminants volatilizing from plants are important across scales ranging from local contaminant spills to global fluxes of methane emanating from ecosystems biochemically reducing organic carbon. In this article past studies are reviewed to clearly differentiate between direct- and indirect-phytovolatilization and we discuss the plant physiology driving phytovolatilization in different ecosystems. Current measurement techniques are also described, including common difficulties in experimental design. We also discuss reports of phytovolatilization in the literature, finding that compounds with low octanol-air partitioning coefficients are more likely to be phytovolatilized (log KOA < 5). Reports of direct phytovolatilization at field sites compare favorably to model predictions. Finally, future research needs are presented that could better quantify phytovolatilization fluxes at field scale.
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Affiliation(s)
- Matt Limmer
- University of Delaware , Department of Plant & Soil Sciences, Newark, Delaware 19716, United States
| | - Joel Burken
- Missouri University of Science and Technology , Department of Civil, Architectural and Environmental Engineering, Rolla, Missouri 65409, United States
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87
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Dadová J, Andráš P, Kupka J, Krnáč J, Andráš P, Hroncová E, Midula P. Mercury contamination from historical mining territory at Malachov Hg-deposit (Central Slovakia). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:2914-27. [PMID: 26490889 DOI: 10.1007/s11356-015-5527-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 10/01/2015] [Indexed: 05/07/2023]
Abstract
Environmental contamination caused by mercury is a serious problem worldwide. The study was conducted in order to identify Hg contamination in soil, technosoil from dumps, groundwater, and surface water in the surroundings of the abandoned Hg deposit of Malachov in Central Slovakia. Soil from the Malachovský brook valley was classified as cambi-soil (rendzina). The highest Hg concentrations (44.24 mg kg(-1)) were described in the soil from the mining area at the Vel'ká Studňa locality. In the groundwater, the maximal Hg content is 0.84 μg L(-1), and in the surface water it is 394 μg L(-1). The speciation study proved that in most samples, Hg occurs in the form of cinnabarite. The release of Hg into the environment as a consequence of weathering is limited.
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88
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Crockett MP, Evans AM, Worthington MJH, Albuquerque IS, Slattery AD, Gibson CT, Campbell JA, Lewis DA, Bernardes GJL, Chalker JM. Sulfur-Limonene Polysulfide: A Material Synthesized Entirely from Industrial By-Products and Its Use in Removing Toxic Metals from Water and Soil. Angew Chem Int Ed Engl 2016; 55:1714-8. [PMID: 26481099 PMCID: PMC4755153 DOI: 10.1002/anie.201508708] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Indexed: 01/22/2023]
Abstract
A polysulfide material was synthesized by the direct reaction of sulfur and d-limonene, by-products of the petroleum and citrus industries, respectively. The resulting material was processed into functional coatings or molded into solid devices for the removal of palladium and mercury salts from water and soil. The binding of mercury(II) to the sulfur-limonene polysulfide resulted in a color change. These properties motivate application in next-generation environmental remediation and mercury sensing.
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Affiliation(s)
- Michael P Crockett
- Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, Oklahoma, United States
| | - Austin M Evans
- Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, Oklahoma, United States
| | - Max J H Worthington
- School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia
| | - Inês S Albuquerque
- Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal
| | - Ashley D Slattery
- Centre for NanoScale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia
| | - Christopher T Gibson
- Centre for NanoScale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia
| | - Jonathan A Campbell
- Centre for NanoScale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia
| | - David A Lewis
- Centre for NanoScale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia
| | - Gonçalo J L Bernardes
- Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal
- Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Justin M Chalker
- School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia, Australia.
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89
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Wang Y, Zhang Y, Hou C, He X, Liu M. Preparation of a novel TETA functionalized magnetic PGMA nano-absorbent by ATRP method and used for highly effective adsorption of Hg(II). J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2015.05.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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90
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YAYAYÜRÜK O, HENDEN E. Use of Ni/Ni xB Nanoparticles as a Novel Adsorbent for the Preconcentration of Mercury Species prior to Cold Vapor-Atomic Fluorescence Spectrometric Determination. ANAL SCI 2016; 32:867-73. [DOI: 10.2116/analsci.32.867] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Onur YAYAYÜRÜK
- Department of Chemistry, Faculty of Science, Ege University
| | - Emür HENDEN
- Department of Chemistry, Faculty of Science, Ege University
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91
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Crockett MP, Evans AM, Worthington MJH, Albuquerque IS, Slattery AD, Gibson CT, Campbell JA, Lewis DA, Bernardes GJL, Chalker JM. Sulfur-Limonene Polysulfide: A Material Synthesized Entirely from Industrial By-Products and Its Use in Removing Toxic Metals from Water and Soil. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508708] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Michael P. Crockett
- Department of Chemistry and Biochemistry; The University of Tulsa; Tulsa Oklahoma United States
| | - Austin M. Evans
- Department of Chemistry and Biochemistry; The University of Tulsa; Tulsa Oklahoma United States
| | - Max J. H. Worthington
- School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
| | - Inês S. Albuquerque
- Instituto de Medicina Molecular; Faculdade de Medicina da Universidade de Lisboa; Lisboa Portugal
| | - Ashley D. Slattery
- Centre for NanoScale Science and Technology; School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
| | - Christopher T. Gibson
- Centre for NanoScale Science and Technology; School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
| | - Jonathan A. Campbell
- Centre for NanoScale Science and Technology; School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
| | - David A. Lewis
- Centre for NanoScale Science and Technology; School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
| | - Gonçalo J. L. Bernardes
- Instituto de Medicina Molecular; Faculdade de Medicina da Universidade de Lisboa; Lisboa Portugal
- Department of Chemistry; University of Cambridge; Cambridge United Kingdom
| | - Justin M. Chalker
- School of Chemical and Physical Sciences; Flinders University; Bedford Park South Australia Australia
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92
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He X, Yang D, Chen H, Zheng W, Li H. A highly sensitive and reversible chemosensor for Hg2+detection based on porphyrin-thymine conjugates. J Mol Recognit 2015; 28:293-8. [DOI: 10.1002/jmr.2442] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 08/27/2014] [Accepted: 10/27/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Xiangzhu He
- College of Chemistry; Xiangtan University; Xiangtan 411105 Hunan Province China
| | - Duanguang Yang
- College of Chemistry; Xiangtan University; Xiangtan 411105 Hunan Province China
| | - Hongbiao Chen
- College of Chemistry; Xiangtan University; Xiangtan 411105 Hunan Province China
| | - Wei Zheng
- College of Chemistry; Xiangtan University; Xiangtan 411105 Hunan Province China
| | - Huaming Li
- College of Chemistry; Xiangtan University; Xiangtan 411105 Hunan Province China
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, and Key Lab of Environment-Friendly Chemistry and Application of Ministry of Education; Xiangtan University; Xiangtan 411105 Hunan Province China
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93
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Removal of Hg from Real Polluted Sediments Using Enhanced-EK Decontamination: Verification of Experimental Methods and Batch-Test Preliminary Results. J CHEM-NY 2015. [DOI: 10.1155/2015/270451] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The aim of the research is to apply a biosurfactant-enhanced-EK technology to marine sediment contaminated by high level of Hg. In this work, data from batch-tests using different novel biosurfactant agents were reported. In addition, a dedicated EK bench-scale apparatus was designed and carried out. Technical test was also performed to evaluate the optimal operating features of the EK bench-scale apparatus, assessing the influence of applied voltage and treatment time on the current intensity and electroosmotic flow. Batch experiments were conducted using two sugar esters as biosurfactants and EDTA salt at different concentrations. Results showed that the maximum extraction efficiency was observed for the biosurfactant Olimpicon GC (15%), for which the Hg extraction was shown to be 3.6-fold higher than for 0.2 M EDTA. From technical tests, the observed reduction of current intensity and electroosmotic flow with time highlights the necessity of using conditioning agents during the treatment. Data demonstrates also the good working features of the experimental apparatus. Preliminary results show that EK treatment jointly with biosurfactants such as sugar esters could be a better choice for the remediation of Hg-polluted sediments. The results obtained are of scientific and practical interest and can be used for further researches.
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94
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Hseu ZY, Huang YT, Hsi HC. Effects of remediation train sequence on decontamination of heavy metal-contaminated soil containing mercury. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2014; 64:1013-1020. [PMID: 25282998 DOI: 10.1080/10962247.2014.917129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/12/2014] [Indexed: 06/03/2023]
Abstract
When a contaminated site contains pollutants including both nonvolatile metals and Hg, one single remediation technology may not satisfactorily remove all contaminants. Therefore, in this study, chemical extraction and thermal treatment were combined as a remediation train to remove heavy metals, including Hg, from contaminated soil. A 0.2 M solution of ethylenediamine tetraacetic acid (EDTA) was shown to be the most effective reagent for extraction of considerable amounts of Cu, Pb, and Zn (> 50%). Hg removal was ineffective using 0.2 M EDTA, but thermogravimetric analysis suggested that heating to 550 degrees C with a heating rate of 5 degrees C/min for a duration of 1 hr appeared to be an effective approach for Hg removal. With the employment of thermal treatment, up to 99% of Hg could be removed. However executing thermal treatment prior to chemical extraction reduced the effectiveness of the subsequent EDTA extraction because nonvolatile heavy metals were immobilized in soil aggregates after the 550 degrees C treatment. The remediation train of chemical extraction followed by thermal treatment appears to remediate soils that have been contaminated by many nonvolatile heavy metals and Hg. Implications: A remediation train conjoining two or more techniques has been initialized to remove multiple metals. Better understandings of the impacts of treatment sequences, namely, which technique should be employed first on the soil properties and the decontamination efficiency, are in high demand. This study provides a strategy to remove multiple heavy metals including Hg from a contaminated soil. The interactions between thermal treatment and chemical extraction on repartitioning of heavy metals was revealed. The obtained results could offer an integrating strategy to remediate the soil contaminated with both heavy metals and volatile contaminants.
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95
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Hamdan SH, Molelekwa GF, Van der Bruggen B. Electrokinetic Remediation Technique: An Integrated Approach to Finding New Strategies for Restoration of Saline Soil and to Control Seawater Intrusion. ChemElectroChem 2014. [DOI: 10.1002/celc.201402071] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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96
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Zhou Y, Zhang J, Luo X, Lin X. Adsorption of Hg(II) in aqueous solutions using mercapto-functionalized alkali lignin. J Appl Polym Sci 2014. [DOI: 10.1002/app.40749] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Yan Zhou
- College of Chemistry and Chemical Engineering; Mianyang Normal University; Mianyang 621000 Sichuan China
| | - Jianping Zhang
- Engineering Research Center of Biomass Materials; Ministry of Education; Southwest University of Science and Technology; Mianyang 621010 Sichuan China
- The Eighth Research Institute, China Academy of Engineering Physics; Mianyang 621900 Sichuan China
| | - Xuegang Luo
- Engineering Research Center of Biomass Materials; Ministry of Education; Southwest University of Science and Technology; Mianyang 621010 Sichuan China
| | - Xiaoyan Lin
- Engineering Research Center of Biomass Materials; Ministry of Education; Southwest University of Science and Technology; Mianyang 621010 Sichuan China
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97
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Bafana A, Chakrabarti T, Krishnamurthi K. Mercuric reductase activity of multiple heavy metal-resistantLysinibacillus sphaericusG1. J Basic Microbiol 2013; 55:285-92. [DOI: 10.1002/jobm.201300308] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 07/08/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Amit Bafana
- Environmental Health Division, National Environmental Engineering Research Institute (NEERI); Council of Scientific and Industrial Research (CSIR); Nagpur India
| | - Tapan Chakrabarti
- Environmental Health Division, National Environmental Engineering Research Institute (NEERI); Council of Scientific and Industrial Research (CSIR); Nagpur India
| | - Kannan Krishnamurthi
- Environmental Health Division, National Environmental Engineering Research Institute (NEERI); Council of Scientific and Industrial Research (CSIR); Nagpur India
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98
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Detoxification of mercury by methanobactin from Methylosinus trichosporium OB3b. Appl Environ Microbiol 2013; 79:5918-26. [PMID: 23872554 DOI: 10.1128/aem.01673-13] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Many methanotrophs have been shown to synthesize methanobactin, a novel biogenic copper-chelating agent or chalkophore. Methanobactin binds copper via two heterocyclic rings with associated enethiol groups. The structure of methanobactin suggests that it can bind other metals, including mercury. Here we report that methanobactin from Methylosinus trichosporium OB3b does indeed bind mercury when added as HgCl2 and, in doing so, reduced toxicity associated with Hg(II) for both Alphaproteobacteria methanotrophs, including M. trichosporium OB3b, M. trichosporium OB3b ΔmbnA (a mutant defective in methanobactin production), and Methylocystis sp. strain SB2, and a Gammaproteobacteria methanotroph, Methylomicrobium album BG8. Mercury binding by methanobactin was evident in both the presence and absence of copper, despite the fact that methanobactin had a much higher affinity for copper due to the rapid and irreversible binding of mercury by methanobactin. The formation of a gray precipitate suggested that Hg(II), after being bound by methanobactin, was reduced to Hg(0) but was not volatilized. Rather, mercury remained associated with methanobactin and was also found associated with methanotrophic biomass. It thus appears that although the mercury-methanobactin complex was cell associated, mercury was not removed from methanobactin. The amount of biomass-associated mercury in the presence of methanobactin from M. trichosporium OB3b was greatest for M. trichosporium wild-type strain OB3b and the ΔmbnA mutant and least for M. album BG8, suggesting that methanotrophs may have selective methanobactin uptake systems that may be based on TonB-dependent transporters but that such uptake systems exhibit a degree of infidelity.
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99
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Prakash D, Gabani P, Chandel AK, Ronen Z, Singh OV. Bioremediation: a genuine technology to remediate radionuclides from the environment. Microb Biotechnol 2013; 6:349-60. [PMID: 23617701 PMCID: PMC3917470 DOI: 10.1111/1751-7915.12059] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 03/19/2013] [Accepted: 03/25/2013] [Indexed: 12/01/2022] Open
Abstract
Radionuclides in the environment are a major human and environmental health concern. Like the Chernobyl disaster of 1986, the Fukushima Daiichi nuclear disaster in 2011 is once again causing damage to the environment: a large quantity of radioactive waste is being generated and dumped into the environment, and if the general population is exposed to it, may cause serious life-threatening disorders. Bioremediation has been viewed as the ecologically responsible alternative to environmentally destructive physical remediation. Microorganisms carry endogenous genetic, biochemical and physiological properties that make them ideal agents for pollutant remediation in soil and groundwater. Attempts have been made to develop native or genetically engineered (GE) microbes for the remediation of environmental contaminants including radionuclides. Microorganism-mediated bioremediation can affect the solubility, bioavailability and mobility of radionuclides. Therefore, we aim to unveil the microbial-mediated mechanisms for biotransformation of radionuclides under various environmental conditions as developing strategies for waste management of radionuclides. A discussion follows of '-omics'-integrated genomics and proteomics technologies, which can be used to trace the genes and proteins of interest in a given microorganism towards a cell-free bioremediation strategy.
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Affiliation(s)
- Dhan Prakash
- Institute of Microbial Technology (CSIR), Sector 39-A, Chandigarh, 160036, India
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100
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Navarro A, Cardellach E, Cañadas I, Rodríguez J. Solar thermal vitrification of mining contaminated soils. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.minpro.2012.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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