JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Tian Yunting,Li Yongmei,Tan Kaixuan,Li Chunguang,Li Xiaojie,Liu Wei,Tang Zhipeng,Liu Longcheng
Bentonite colloids and fluid velocity significantly influence the migration behavior of the redox sensitive nuclide Se(IV) in the disposal repository. In this study, the migration behavior of Se(IV) in artificial fracture, which was created by Beishan granite and polyethylene pipe, was studied under reduced condition, with Br − as a tracer. The effects of bentonite colloids and fluid flow rate on the migration of Se(IV) in the fracture were explored. The results show that a part of Se(IV) would adsorb on the surface of granite in reduced condition. The maximum penetration rate of Se(IV) increases with the decrease of water flow rate. In addition, the colloids hindered the migration of nuclide Se(IV) in the fissure to some extent during the process of co-migration.
研究领域:
环境科学
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放射性废物管理
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DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Xiaoxue Zhang,Mengmeng Zhong,Rui Zhou,Wenxiu Qin,Youbin Si
Microbial reduction of Se(IV) to Se(0) is extremely important for the detoxification of selenium oxyanion, but the reductive mechanism is still controversial. In this study, the reduction of Se(IV) by Shewanella oneidensis MR-1 and Shewanella putrefaciens was systematically investigated. The results showed that excessive Se(IV) severely inhibited the growth of microorganisms and Se(IV) reduction. The extracellular accumulation of Nano-Se(0) particles was shown to be approximately 250–650 nm in diameter. Riboflavin facilitated Se(IV) reduction, while rotenone , as an electron inhibitor, could completely inhibit Se(IV) reduction, validating the extracellular electron transport process for biosynthesized Nano-Se(0). Importantly, the amorphous Nano-Se(0) synthesized by S. oneidensis MR-1 were mixtures of helical chains and Se 8 rings, while those synthesized by S. putrefaciens were mainly composed of helical chains. FTIR results demonstrated that Nano-Se(0) particles were wrapped by some proteins, organic substances and lipids , exhibiting superior dispersibility and biocompatibility. Biogenic Nano-Se(0) particles can also be considered for technological applications in various fields.
研究领域:
微生物学
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环境科学
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DOI
高影响因子
Food Analytical Methods
·
2016
·Vol. 10
·期 6
·1653-1660
·
IF 2.167
Wang Xiaojun,Chen Peng,Cao Liang,Xu Guoliang,Yang Siyu,Fang Ye,Wang Guozhen,Hong Xincheng
A novel and sensitive magnetic ionic liquid-based up-and-down-shaker-assisted dispersive liquid-liquid microextraction (MIL-UDSA-DLLME) was developed for the graphite furnace atomic absorption spectrometric measurement of inorganic selenium speciation from various rice matrixes. In the first microextraction step, the magnetic ionic liquid (1-butyl-3-methylimidazolium tetrachloroferrate, [C 4 mim][FeCl 4 ]) was selected to extract the complex of Se(IV) and 2,3-diaminonaphthalene from aqueous solution by the assistance of up-and-down-shaker vortex agitator. After the microextraction step, the magnetic ionic liquid containing target analytes was collected at the bottom of the tube by applying an external magnetic field around the test tube. Under the optimized conditions, the method present has low detection limit (0.018 μg L −1 ), wide linear dynamic range (0.03–10 μg L −1 ), and good repeatability (<3.0%, n = 10) for Se(IV). The proposed methodology was applied for separation and preconcentration of inorganic selenium in standard reference materials including GBW10010 rice, GBW10043 Liaoning rice, and GBW10045 Hunan rice with satisfactory results. The developed methodology was also successfully used for the speciation of Se(IV) and Se(VI) in different rice samples with the relative recoveries within the acceptable range of 94.9–104.8% for the addition recovery tests.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2011
·Vol. 173
·期 1
·267-273
·
IF 2.578
Wang Yang,Luo Xiaoyu,Tang Jie,Hu Xiaoya
A method is presented for matrix separation, preconcentration and determination by hydride generation atomic fluorescence spectrometry of trace amounts of Se(IV). It is based on solidified floating drops of 1-undecanol that are capable of extracting the target analyte after chelation with a water soluble ligand and subsequent ultrasound-assisted back-extraction into a aqueous solution. Hydride generation was then accomplished by reaction with a solution of sodium borohydride. Under optimized conditions, an enrichment factor of 15 and a linear calibration plot in the range from 0.01 to 5.0 μg L −1 were achieved using a 10.0 mL sample. The detection limit (3σ) is 7.0 ng L −1 , and the relative standard deviation (RSD) is 2.1% at 1.0 μg L −1 ( n = 11). The method was applied to determination of Se(IV) in different real water samples through recovery experiments and subsequently validated against two certified reference materials.
A solidified floating organic drop microextraction coupled with hydride generation atomic fluorescence spectrometry for the determination of Se(IV) is described.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
Surfaces and Interfaces
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2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Biao Yuan,Pan Wu,Changjun Liu,Jian He,Wei Jiang
The absorber layers of end-of-life thin-film solar cells represent valuable sources of tellurium and selenium, necessitating efficient separation and recovery strategies for sustainable resource utilization. In this work, amorphous hydrous zirconium oxides (AHZOs) were synthesized via the sol-gel method, featuring abundant surface hydroxyl groups, and enhanced specific surface area for effective Te(IV)/Se(IV) adsorption. The maximum adsorption capacities reached 743.8 mg/g for Te(IV) at pH 8 and 375.5 mg/g for Se(IV) at pH 2, driven by spontaneous endothermic processes involving synergistic mechanisms of electrostatic attraction, hydrogen bonding, ion exchange, and surface complexation. Competitive adsorption studies revealed Te(IV)’s superior binding affinity, achieving a separation coefficient up to 1609 through the selective displacement of adsorbed Se(IV). Both single and mixed solutions can be treated as wastewater with appropriate amounts of AHZOs to achieve emission standards. A stepwise adsorption-desorption strategy yielded 99.6 %-pure Se(IV)-enriched and 95.9 %-pure Te(IV) solutions, enabling effective separation and purification. Volume-controlled desorption further facilitated resource enrichment, producing concentrated solutions containing 2324 mg/L Te(IV) and 2000 mg/L Se(IV). Through adsorption and desorption, the separation and recovery of Te(IV) and Se(IV) were achieved in the simulated leaching solution with recoveries of 90.8 % and 73.9 %, respectively. This study establishes AHZOs as a promising material for sustainable metal recovery from waste photovoltaic cells, demonstrating significant potential for resource recovery in renewable energy systems.
研究领域:
环境科学
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材料科学
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化学工程
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可再生能源
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资源回收
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Jisheng Kou,Xiangyue Wei,Hui Wu,Wensheng Linghu,Guodong Sheng,Yixin Pan
The removal of U(VI) and Se(IV) in an aqueous solution was investigated by batch experiments and characterized by spectroscopy techniques such as FTIR, XRD, SEM, TEM, XPS, using FeS@h-BN nanocomposite which was synthesized by hexagonal BN (h-BN) as the stabilizer anchored onto FeS nanoparticles to address the agglomeration of the FeS. The effects of pH, adsorbent concentration, contact time, and initial concentration of U(VI) and Se(IV) on FeS@h-BN adsorption U(VI) and Se(IV) were studied. Results showed that FeS@h-BN nanocomposite showed an excellent decontamination performance due to the large surface area and surface potential. A pseudo-second-order kinetic model well reflected the kinetic adsorption of U(VI) and Se(IV) which indicated chemical interaction mainly contributed to U(VI) and Se(IV) adsorption on FeS@h-BN. The adsorption process of removing U(VI) fitted Freundlich and D-R models well which presented multilayer adsorption on the nanocomposite surface. The Langmuir model fitted well with sorption isotherm data of Se(IV) removal displaying a single monolayer reaction between Se(IV) and FeS@h-BN. The adsorption of U(VI) and Se(IV) was high pH-dependent since pH affected the FeS@h-BN nanocomposite surface potential and U(VI) and Se(IV) speciation. The maximum sorption capacity of U(VI) and Se(IV) reached 163.11 and 196.39 mg/g, respectively. These results reveal that FeS@h-BN nanocomposite could be promising for the effective decontamination of U(VI) and Se(IV).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2020
·
IF 1.724
Liang Xu,Fenglian Fu
In order to treat selenium pollution, the study presents the use of potassium ferrate (K2FeO4) as an environmentally friendly agent for in situ removal of Se(IV) from aqueous media. Batch experiments were carried out to evaluate the influences of various factors including dosage of K2FeO4, ex-situ and in-situ adsorption, initial pH, and adsorption isotherms. The results showed that increasing dosage of K2FeO4 benefited the removal of total selenium with the efficiency up to 97.0% and Se(IV) removal significantly depended on pH, and as the pH increases, the decrease in Se(IV) adsorption efficiency is a general trend of pH dependence. The X-ray powder diffraction, Fourier transformed infrared spectrometer and high-resolution X-ray photoelectron spectroscopy analysis indicated that Se(IV) was removed from the aqueous solution by adsorbing on the surface of the decomposition products of K2FeO4 which are ferric oxide nanoparticles, and the selenium adsorbed on the generated ferric oxide nanoparticles existed in the forms of Se(IV) and Se(VI). Se(IV) and Se(VI) were adsorbed to the decomposition products of K2FeO4 by forming an inner-sphere complexes and an outer-sphere complexes, respectively.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
BMC MICROBIOLOGY
·
2026
·
IF 5.4
Xu Weijun,Xia Xuesen,Wang Xiaoyin,Zhang Qimin,Zhang Wenke,Liang Yusheng,Sun Cuicui,Chen Jianping,Wu Zhenqiang,Zhong Bin
Mechanisms supporting microbial survival under lethal selenite [Se(IV)] concentrations during bioremediation remain elusive. This study employed integrated multi-omics to analyze Lactiplantibacillus plantarum BSe (LPB) under extreme Se(IV) stress. LPB achieved 76.32% removal at 100 mM Se(IV), but this high efficiency came at a significant cost to cell viability and intracellular biomass. Multi-omics integration suggested a sophisticated survival strategy coupling metabolic reprogramming with a sacrificial cell lysis. Specifically, carbon flux was redirected from glycolysis to the pentose phosphate pathway to fuel NADPH generation. Furthermore, a > 35-fold surge in intracellular dehydroascorbic acid strongly suggests the putative activation of de novo ascorbic acid synthesis as a potential alternative reductant pathway. Finally, multi-omics data lead us to propose a mechanism whereby LPB adopts a putative sacrificial cell lysis to extrude SeNPs, evidenced by the downregulation of peptidoglycan-binding proteins and concurrent upregulation of autolysins like lysozyme and RecX. Collectively, these findings suggest LPB survives lethal Se(IV) stress through a trade-off mechanism: rewiring metabolism to power an ascorbic acid-associated Se(IV) reduction pathway while sacrificing structural integrity to export SeNPs.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 21
·21609-21618
·
IF 2.914
Tan Guangcai,Mao Yi,Wang Hongyuan,Junaid Muhammad,Xu Nan
Biochar (BC) and activated carbon (AC) were both produced from corn straw. Biochar-supported zerovalent iron (BC-ZVI) and activated carbon-supported zerovalent iron (AC-ZVI) were synthesized and applied for Se(IV)/Se(VI) removal. The sorption capacity of BC-ZVI for Se(IV) and Se(VI) was reported at 62.52 and 35.39 mg g −1 , higher than that of AC-ZVI (56.02 and 33.24 mg g −1 ), respectively, due to its higher iron content and more positive charges. The spectroscopic analyses showed that Se(IV)/Se(VI) were reduced to Se(0)/Se(-II) of less toxicity and solubility. The effects of various factors such as pH, ionic strength, co-existing cations and anions, and natural organic matter (NOM) were also investigated. Ionic strength showed no significant effect on Se(IV)/Se(VI) removal, but pH was critical. The presence of NO 3 − and SO 4 2− did not cause obvious inhibition to the removal, while PO 4 3− inhibited the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI) significantly. Common cations (K + , Ca 2+ , and Mg 2+ ) were found to slightly enhance the removal, while NOM significantly decreased the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI). Besides, NOM showed stronger inhibition effect on AC-ZVI than that on BC-ZVI. These results indicated that BC-ZVI, compared with AC-ZVI, could be a promising sorbent to remove Se(IV)/Se(VI) due to its low cost and high efficiency.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）