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Feng YX, Tian P, Li CZ, Hu XD, Lin YJ. Elucidating the intricacies of the H 2S signaling pathway in gasotransmitters: Highlighting the regulation of plant thiocyanate detoxification pathways. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 276:116307. [PMID: 38593497 DOI: 10.1016/j.ecoenv.2024.116307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 04/02/2024] [Accepted: 04/06/2024] [Indexed: 04/11/2024]
Abstract
In recent decades, there has been increasing interest in elucidating the role of sulfur-containing compounds in plant metabolism, particularly emphasizing their function as signaling molecules. Among these, thiocyanate (SCN-), a compound imbued with sulfur and nitrogen, has emerged as a significant environmental contaminant frequently detected in irrigation water. This compound is known for its potential to adversely impact plant growth and agricultural yield. Although adopting exogenous SCN- as a nitrogen source in plant cells has been the subject of thorough investigation, the fate of sulfur resulting from the assimilation of exogenous SCN- has not been fully explored. There is burgeoning curiosity in probing the fate of SCN- within plant systems, especially considering the possible generation of the gaseous signaling molecule, hydrogen sulfide (H2S) during the metabolism of SCN-. Notably, the endogenous synthesis of H2S occurs predominantly within chloroplasts, the cytosol, and mitochondria. In contrast, the production of H2S following the assimilation of exogenous SCN- is explicitly confined to chloroplasts and mitochondria. This phenomenon indicates complex interplay and communication among various subcellular organelles, influencing signal transduction and other vital physiological processes. This review, augmented by a small-scale experimental study, endeavors to provide insights into the functional characteristics of H2S signaling in plants subjected to SCN--stress. Furthermore, a comparative analysis of the occurrence and trajectory of endogenous H2S and H2S derived from SCN--assimilation within plant organisms was performed, providing a focused lens for a comprehensive examination of the multifaceted roles of H2S in rice plants. By delving into these dimensions, our objective is to enhance the understanding of the regulatory mechanisms employed by the gasotransmitter H2S in plant adaptations and responses to SCN--stress, yielding invaluable insights into strategies for plant resilience and adaptive capabilities.
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Affiliation(s)
- Yu-Xi Feng
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China; Jiangmen Laboratory of Carbon Science and Technology, Hong Kong University of Science and Technology (Guangzhou), Jiangmen, Guangdong 529199, People's Republic of China; The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541004, People's Republic of China.
| | - Peng Tian
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Cheng-Zhi Li
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Xiao-Dong Hu
- Jiangmen Laboratory of Carbon Science and Technology, Hong Kong University of Science and Technology (Guangzhou), Jiangmen, Guangdong 529199, People's Republic of China
| | - Yu-Juan Lin
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, People's Republic of China; The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541004, People's Republic of China; Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, People's Republic of China.
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Ullah A, Tian P, Zhang H, Yu XZ. Exogenous thiocyanate inhibits sulfurtransferase pathway and induces β-cyanoalanine synthase pathway to enhance exogenous cyanide assimilation in rice plants. CHEMOSPHERE 2023; 339:139683. [PMID: 37532205 DOI: 10.1016/j.chemosphere.2023.139683] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 07/13/2023] [Accepted: 07/29/2023] [Indexed: 08/04/2023]
Abstract
Cyanide (CN-) assimilation in plants takes place by β-cyanoalanine synthase (β-CAS) and sulfurtransferase (ST), in which the ST pathway converts CN- into thiocyanate (SCN-). Both chemicals (CN- and SCN-) are frequently detected in the effluent of gold mining operations. In this connection, exogenous SCN- was applied to rice plants with CN- and compared with CN- alone to investigate its effects on CN- assimilation and degradation pathways. Interestingly, the CN- and SCN- content in both roots and shoots were increased with the increase in "CN-" treatments, but surprisingly their content under "SCN-+CN-" treatments did not show the similar trend. The increasing trend remained the same for CN- but the SCN- content was constant with increasing CN- concentrations in comparison with the control (SCN- alone). Additionally, the assimilation rates of CN- in rice plants under "SCN-+CN-" treatments were significantly higher than "CN-" treatments. The application of SCN- with CN- mostly alters the expression of both β-CAS and ST-associated genes. On one side, the application of SCN- significantly repressed the expression of genes encoded with ST in rice plants, but on the other side, it significantly up-regulated the expression of the β-CAS gene located in mitochondria. These results reveal that the application of exogenous SCN- increases CN- assimilation rates by inhibiting the ST pathway and stimulating the β-CAS pathway. This study would provide new insight into the positive effects of exogenous SCN- in increasing CN- assimilation by altering the degradation pathways in rice plants.
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Affiliation(s)
- Abid Ullah
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Peng Tian
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Hua Zhang
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Xiao-Zhang Yu
- College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China.
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Jaramillo-Fierro X, Alvarado H, Montesdeoca F, Valarezo E. Faujasite-Type Zeolite Obtained from Ecuadorian Clay as a Support of ZnTiO 3/TiO 2 NPs for Cyanide Removal in Aqueous Solutions. Int J Mol Sci 2023; 24:ijms24119281. [PMID: 37298234 DOI: 10.3390/ijms24119281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/12/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023] Open
Abstract
In this study, zeolites prepared by the hydrothermal method from Ecuadorian clay were combined with the precursor clay and with the semiconductor ZnTiO3/TiO2 prepared by the sol-gel method to adsorb and photodegrade cyanide species from aqueous solutions. These compounds were characterized by X-ray powder diffraction, X-ray fluorescence, scanning electron microscopy, energy-dispersive X-rays, point of zero charge, and specific surface area. The adsorption characteristics of the compounds were measured using batch adsorption experiments as a function of pH, initial concentration, temperature, and contact time. The Langmuir isotherm model and the pseudo-second-order model fit the adsorption process better. The equilibrium state in the reaction systems at pH = 7 was reached around 130 and 60 min in the adsorption and photodegradation experiments, respectively. The maximum cyanide adsorption value (73.37 mg g-1) was obtained with the ZC compound (zeolite + clay), and the maximum cyanide photodegradation capacity (90.7%) under UV light was obtained with the TC compound (ZnTiO3/TiO2 + clay). Finally, the reuse of the compounds in five consecutive treatment cycles was determined. The results reflect that the compounds synthesized and adapted to the extruded form could potentially be used for the removal of cyanide from wastewater.
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Affiliation(s)
- Ximena Jaramillo-Fierro
- Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
| | - Hipatia Alvarado
- Ingeniería Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
| | - Fernando Montesdeoca
- Ingeniería Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
| | - Eduardo Valarezo
- Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
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Jaramillo-Fierro X, León R. Effect of Doping TiO 2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide-A Comparative Study. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13061068. [PMID: 36985962 PMCID: PMC10055693 DOI: 10.3390/nano13061068] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/10/2023] [Accepted: 03/11/2023] [Indexed: 06/01/2023]
Abstract
Free cyanide is a highly dangerous compound for health and the environment, so treatment of cyanide-contaminated water is extremely important. In the present study, TiO2, La/TiO2, Ce/TiO2, and Eu/TiO2 nanoparticles were synthesized to assess their ability to remove free cyanide from aqueous solutions. Nanoparticles synthesized through the sol-gel method were characterized by X-ray powder diffractometry (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transformed infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and specific surface area (SSA). Langmuir and Freundlich isotherm models were utilized to fit the adsorption equilibrium experimental data, and pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to fit the adsorption kinetics experimental data. Cyanide photodegradation and the effect of reactive oxygen species (ROS) on the photocatalytic process were investigated under simulated solar light. Finally, reuse of the nanoparticles in five consecutive treatment cycles was determined. The results showed that La/TiO2 has the highest percentage of cyanide removal (98%), followed by Ce/TiO2 (92%), Eu/TiO2 (90%), and TiO2 (88%). From these results, it is suggested that La, Ce, and Eu dopants can improve the properties of TiO2 as well as its ability to remove cyanide species from aqueous solutions.
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Affiliation(s)
- Ximena Jaramillo-Fierro
- Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
| | - Ricardo León
- Maestría en Química Aplicada, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador
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Xiao X, An X, Jiang Y, Wang L, Li Z, Lai F, Zhang Q. A newly developed consortium with a highly efficient thiocyanate degradation capacity: A comprehensive investigation of the degradation and detoxification potential. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 318:120878. [PMID: 36526057 DOI: 10.1016/j.envpol.2022.120878] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 12/10/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Thiocyanate-containing wastewater harms ecosystems and can cause serious damage to animals and plants, so it is urgent to treat it effectively. In this study, a new efficient thiocyanate-degrading consortium was developed and its degradation characteristics were studied. It was found that up to 154.64 mM thiocyanate could be completely degraded by this consortium over 6 days of incubation, with a maximum degradation rate of 1.53 mM h-1. High-throughput sequencing analysis showed that Thiobacillus (77.78%) was the predominant thiocyanate-degrading bacterial genus. Plant toxicology tests showed that the germination index of mung bean and rice seeds cultured with media obtained after thiocyanate degradation by the consortium increased by 94% and 84.83%, respectively, compared with the control group without thiocyanate degradation. Cytotoxicity tests showed that thiocyanate without degradation significantly decreased the Neuro-2a cell activity and mitochondrial membrane potential; induced reactive oxygen species generation and apoptosis; increased the cellular Ca2+ concentration; and damaged the cell nucleus and DNA. Furthermore, the thiocyanate degradation products produced the consortium were almost totally non-toxic, revealing the same characteristics as those of the control using distilled water. This study shows that the consortium has a high degradation efficiency and detoxification characteristics, as well as great application potential in bioremediation of industrial thiocyanate-containing wastewater.
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Affiliation(s)
- Xiaoshuang Xiao
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China.
| | - Xuejiao An
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China
| | - Yuling Jiang
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China
| | - Liuwei Wang
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China
| | - Zelin Li
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China
| | - Fenju Lai
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China
| | - Qinghua Zhang
- College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, 330045, PR China.
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Salmin VV, Morgun AV, Olovyannikova RY, Kutyakov VA, Lychkovskaya EV, Brusina EB, Salmina AB. Atmospheric Reactive Oxygen Species and Some Aspects of the Antiviral Protection at the Respiratory Epithelium. BIOCHEMISTRY (MOSCOW), SUPPLEMENT SERIES B: BIOMEDICAL CHEMISTRY 2022; 16:79-90. [PMID: 35601461 PMCID: PMC9113385 DOI: 10.1134/s1990750822020068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/18/2021] [Accepted: 10/20/2021] [Indexed: 11/22/2022]
Affiliation(s)
- V. V. Salmin
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
| | - A. V. Morgun
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
| | - R. Ya. Olovyannikova
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
| | - V. A. Kutyakov
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
| | - E. V. Lychkovskaya
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
| | - E. B. Brusina
- Kemerovo State Medical University, ul. Voroshilova 22A, 650056 Kemerovo, Russia
| | - A. B. Salmina
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, 660022 Krasnoyarsk, Russia
- Research Center of Neurology, Volokolamskoe shosse 80, 125367 Moscow, Russia
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Salmin VV, Morgun AV, Olovyannikova RY, Kutyakov VA, Lychkovskaya EV, Brusina EB, Salmina AB. [Atmospheric reactive oxygen species and some aspects of the antiviral protection of the respiratory epithelium]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2021; 67:383-393. [PMID: 34730551 DOI: 10.18097/pbmc20216705383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The review focuses on molecular and biochemical mechanisms of nonspecific protection of respiratory epithelium. The authors provide a comprehensive analysis of up-to-date data on the activity of the lactoperoxidase system expressed on the surface of the respiratory epithelium which provides the generation of hypothiocyanate and hypoiodite in the presence of locally produced or inhaled hydrogen peroxide. Molecular mechanisms of production of active compounds with antiviral and antibacterial effects, expression profiles of enzymes, transporters and ion channels involved in the generation of hypothiocyanite and hypoiodate in the mucous membrane of the respiratory system in physiological and pathological conditions (inflammation) are discussed. In the context of antibacterial and antiviral defense special attention is paid to recent data confirming the effects of atmospheric air composition on the efficiency of hypothiocyanite and hypoiodate synthesis in the respiratory epithelium. The causes and outcomes of lactoperoxidase system impairment due to the action of atmospheric factors are discussed in the context of controlling the sensitivity of the epithelium to the action of bacterial agents and viruses. Restoration of the lactoperoxidase system activity can be achieved by application of pharmacological agents aimed to compensate for the lack of halides in tissues, and by the control of chemical composition of the inhaled air.
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Affiliation(s)
- V V Salmin
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
| | - A V Morgun
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
| | - R Ya Olovyannikova
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
| | - V A Kutyakov
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
| | - E V Lychkovskaya
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia
| | - E B Brusina
- Kemerovo State Medical University, Kemerovo, Russia
| | - A B Salmina
- Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, Russia; Research Center of Neurology, Moscow, Russia
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Suman SG, Snæbjörnsson T, Ragnarsdóttir O, Polukeev AV, Wendt OF. Synthesis of mixed salts of the [Mo2O2(μ-S)2(SCN)6-n(L)n](4+n)− anion (n = 0–2); structures of [Mo2O2(μ-S)2(SCN)5(CH3CN)]3−, [Mo2O2(μ-S)2(CN)5]3−, and [Mo2O2(μ-S)2(CN)2(O)]2−, and probing the ligand exchange of thiocyanate and cyanide. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gretarsdottir JM, Jonsdottir S, Lewis W, Hambley TW, Suman SG. Water-Soluble α-Amino Acid Complexes of Molybdenum as Potential Antidotes for Cyanide Poisoning: Synthesis and Catalytic Studies of Threonine, Methionine, Serine, and Leucine Complexes. Inorg Chem 2020; 59:18190-18204. [PMID: 33249838 DOI: 10.1021/acs.inorgchem.0c02672] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Water-soluble complexes are desirable for the aqueous detoxification of cyanide. Molybdenum complexes with α-amino acid and disulfide ligands with the formula K[(L)Mo2O2(μ-S)2(S2)] (L = leu (1), met (2), thr (3), and ser (4)) were synthesized in a reaction of [(DMF)3MoO(μ-S)2(S2)] with deprotonated α-amino acids; leu, met, thr, and ser are the carboxylate anions of l-leucine, l-methionine, l-threonine, and l-serine, respectively. Potassium salts of α-amino acids (leu (1a), met (2a), thr (3a), and ser (4a)) were prepared as precursors for complexes 1-4, respectively, by employing a nonaqueous synthesis route. The ligand exchange reaction of [Mo2O2(μ-S)2(DMF)6](I)2 with deprotonated α-amino acids afforded bis-α-amino acid complexes, [(L)2Mo2O2(μ-S)2] (6-8). A tris-α-amino acid complex, [(leu)2Mo2O2(μ-S)2(μ-leu + H)] (5; leu + H is the carboxylate anion of l-leucine with the amine protonated), formed in the reaction with leucine. 5 crystallized from methanol with a third weakly bonded leucine as a bridging bidentate carboxylate. An adduct of 8 with SCN- coordinated, 9, crystallized and was structurally characterized. Complexes 1-4 are air stable and highly water-soluble chiral molecules. Cytotoxicity studies in the A549 cell line gave IC50 values that range from 80 to 400 μM. Cyclic voltammetry traces of 1-8 show solvent-dependent irreversible electrochemical behavior. Complexes 1-4 demonstrated the ability to catalyze the reaction of thiosulfate and cyanide in vitro to exhaustively transform cyanide to thiocyanate in less than 1 h.
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Affiliation(s)
| | | | - William Lewis
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Trevor W Hambley
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Sigridur G Suman
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
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Shafiei F, Watts MP, Pajank L, Moreau JW. The effect of heavy metals on thiocyanate biodegradation by an autotrophic microbial consortium enriched from mine tailings. Appl Microbiol Biotechnol 2020; 105:417-427. [PMID: 33263791 PMCID: PMC7778618 DOI: 10.1007/s00253-020-10983-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 10/17/2020] [Accepted: 10/26/2020] [Indexed: 11/28/2022]
Abstract
Abstract Bioremediation systems represent an environmentally sustainable approach to degrading industrially generated thiocyanate (SCN−), with low energy demand and operational costs and high efficiency and substrate specificity. However, heavy metals present in mine tailings effluent may hamper process efficiency by poisoning thiocyanate-degrading microbial consortia. Here, we experimentally tested the tolerance of an autotrophic SCN−-degrading bacterial consortium enriched from gold mine tailings for Zn, Cu, Ni, Cr, and As. All of the selected metals inhibited SCN− biodegradation to different extents, depending on concentration. At pH of 7.8 and 30 °C, complete inhibition of SCN− biodegradation by Zn, Cu, Ni, and Cr occurred at 20, 5, 10, and 6 mg L−1, respectively. Lower concentrations of these metals decreased the rate of SCN− biodegradation, with relatively long lag times. Interestingly, the microbial consortium tolerated As even at 500 mg L−1, although both the rate and extent of SCN− biodegradation were affected. Potentially, the observed As tolerance could be explained by the origin of our microbial consortium in tailings derived from As-enriched gold ore (arsenopyrite). This study highlights the importance of considering metal co-contamination in bioreactor design and operation for SCN− bioremediation at mine sites. Key points • Both the efficiency and rate of SCN−biodegradation were inhibited by heavy metals, to different degrees depending on type and concentration of metal. • The autotrophic microbial consortium was capable of tolerating high concentrations of As, potential having adapted to higher As levels derived from the tailings source. Supplementary Information The online version contains supplementary material available at 10.1007/s00253-020-10983-4.
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Affiliation(s)
- Farhad Shafiei
- School of Earth Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Mathew P Watts
- School of Earth Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Lukas Pajank
- School of Earth Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - John W Moreau
- School of Earth Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia. .,School of Geographical & Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, UK.
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11
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Turan A, Keyikoglu R, Kobya M, Khataee A. Degradation of thiocyanate by electrochemical oxidation process in coke oven wastewater: Role of operative parameters and mechanistic study. CHEMOSPHERE 2020; 255:127014. [PMID: 32679632 DOI: 10.1016/j.chemosphere.2020.127014] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 05/06/2020] [Accepted: 05/07/2020] [Indexed: 06/11/2023]
Abstract
This study presents the removal of thiocyanate (SCN-) from coke oven wastewater by the electrooxidation (EO) process. Initially, the performances boron-doped diamond (BDD) and different DSA (Dimensionally stable anode) electrodes including Ti/IrO2, Ti/IrO2-RuO2, and Ti/IrO2-RuO2-TiO2 in SCN- removal were compared. BDD anode outperformed the Ti-based mixed metal oxide (MMO) anodes achieving 96.51% SCN- removal efficiency. The most favorable conditions for the removal of SCN- using BDD anode were determined as follows: pH = 9, current density = 43.10 A m-2, and the electrolyte concentration (Na2SO4) = 2.5 g L-1. The strong role of ⦁OH in the removal of SCN- was confirmed by the addition of radical quenching agents. The evolution of the intermediates as a result of the EO of SCN- was determined. Under the determined conditions, the EO process could remove 84.13% of SCN- and 94.67% of phenol from a real coke oven wastewater, which was comparable to that of the simulated solution. The electrical energy consumption cost of the process to remove 1 kg of SCN- was calculated as 0.208 US $. Overall, the study showed the EO using BDD anode is a cost-effective method for the removal of SCN- from a coke oven wastewater.
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Affiliation(s)
- Ayşenur Turan
- Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey
| | - Ramazan Keyikoglu
- Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey
| | - Mehmet Kobya
- Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey
| | - Alireza Khataee
- Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey; Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
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12
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Biswas P, Bhunia P, Saha P, Sarkar S, Chandel H, De S. In situ photodecyanation of steel industry wastewater in a pilot scale. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:33226-33233. [PMID: 32529620 DOI: 10.1007/s11356-020-09632-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
The photodegradation of cyanide from steel industry wastewater was explored in pilot plant scale using hydrogen peroxide (H2O2) under UV irradiation. However, it was interesting to notice that only H2O2 or only UV was inefficient to degrade the cyanide from industrial wastewater. There was a synergy between H2O2 and UV radiation for the degradation of cyanide. The generated hydroxyl radicals from irradiated H2O2 were responsible for the efficient degradation of cyanide. Besides, the dissolved oxygen had a significant role on the degradation process. The photodecyanation rate was faster initially and decreased gradually thereafter ensuring the industrial viability of the process. The dozing rate of H2O2 and the UV lamp power were systematically optimized and they were found to be 8 l/m3 and 640 W, respectively. The photodecyanation kinetics was also explored simultaneously and the rate constant was found to be 3.21 × 10-2 min-1 at the selected dosage of 8 l/m3. This work demonstrates a scalable and facile decyanation technique from steel plant effluent without generation of toxic by-products.
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Affiliation(s)
- Pinakpani Biswas
- Environmental Research Group, TATA Steel R&D, Jamshedpur, 831007, India
| | - Prasenjit Bhunia
- Environmental Research Group, TATA Steel R&D, Jamshedpur, 831007, India
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, 721302, India
| | - Priyanka Saha
- Environmental Research Group, TATA Steel R&D, Jamshedpur, 831007, India
| | - Supriya Sarkar
- Environmental Research Group, TATA Steel R&D, Jamshedpur, 831007, India
| | - Harsh Chandel
- Environmental Research Group, TATA Steel R&D, Jamshedpur, 831007, India
| | - Sirshendu De
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, 721302, India.
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Suman SG, Gretarsdottir JM, Penwell PE, Gunnarsson JP, Frostason S, Jonsdottir S, Damodaran KK, Hirschon A. Reaction Chemistry of the syn-[Mo 2O 2(μ-S) 2(S 2)(DMF) 3] Complex with Cyanide and Catalytic Thiocyanate Formation. Inorg Chem 2020; 59:7644-7656. [PMID: 32401019 DOI: 10.1021/acs.inorgchem.0c00608] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Removal of cyanide as nontoxic thiocyanate under physiological conditions may serve as a catalytic detoxification route in vivo. Aqueous catalytic reaction conditions were explored where at the conditions employed the reaction proceeded to exhaustion in 1 h. The complex, syn-[Mo2O2(μ-S)2(S2)(DMF)3] 1, participates in a ligand exchange reaction of the dimethylformamide ligands and cyanide. Simultaneous sulfur abstraction reaction from the terminal disulfide group forms thiocyanate and terminal sulfido ligand. Respective reaction rates for the two reactions appear competitive where different products were isolated solely based on change of reaction temperature. The approach to determine the number of cyanide ligands participating in the ligand exchange reaction by varying the stoichiometry and reaction temperature led to identification and isolation of tetranuclear complexes 2 and 5 and dinuclear complexes 3, 4, and 6. A synthesized and fully characterized thiocyanate analog of 6 (7) supports spectroscopic characterization of 6. The tetranuclear anion, [Mo4O4(μ-S)6(CN)4]4-, 2, was crystallized from a reaction at ambient temperature. The dinuclear anion, [Mo2O2(μ-S)2(S)(CN)3]3-, 3, was crystallized from similar reaction conditions at lower temperature. The reaction yield of thiocyanate obtained at pH of 7.4 and at 9.2 as a function of time, for several ratios of cyanide, favors the sulfur abstraction reaction at elevated pH. The sulfur abstraction reaction is the first step in a proposed mechanism of the reaction of cyanide and thiosulfate to form thiocyanate and sulfite by 1.
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Affiliation(s)
- Sigridur G Suman
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland.,Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
| | | | - Paul E Penwell
- Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
| | - Jon P Gunnarsson
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | - Sindri Frostason
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | | | | | - Albert Hirschon
- Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
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