Separations
·
2025
·Vol. 12
·期 2
·27
·
IF 2.7
Zhiyu Zhao,Lianjing Mao,Tianyu Zheng,Xiao Li,Chunsen Ye,Pengrui Zhang,Huifang Li,Wei Sun,Jinhe Sun
Enriched lithium isotopes (6Li and7Li) are essential in the nuclear energy industry, where6Li is bombarded with neutrons to produce tritium for fusion reactions, while7Li is used as a core coolant and pH regulator. Separation of6Li and7Li by electromigration is a promising method for producing enriched lithium isotopes that fulfill industrial needs. In this work, based on a previously proposed biphasic system electromigration routine, a three-stage system of ‘LiCl aqueous solution (anolyte)|B12C4-[EMIm][NTf2] organic solution|NH4Cl aqueous solution (catholyte)’ was constructed and the rules of lithium isotope separation and lithium-ion migration investigated. It was shown that the isotope enrichment effect of the catholyte was greatly affected by the experimental conditions, while that of the organic solution was less affected. As the B12C4 concentration increased, enhancement of7Li enrichment in the catholyte and6Li enrichment in the organic solution was observed, and α(C/O) and α(O/A) reached 0.975 and 1.018 at B12C4 of 0.5 mol/L. With the increase in current, migration time, and LiCl concentration, the isotope that was enriched in the catholyte trended from7Li to6Li (about 6 mA, 12 h or LiCl of 5 mol/L). Taking lithium-ion transport efficiency and lithium isotope separation effect into consideration together, a current of at least 6 mA, duration of at least 12 h, LiCl concentration of at least 1 mol/L and B12C4 concentration of 0.2 mol/L are suggested for the electromigration process. The work provides an important reference for system construction and experimental design of a biphasic electromigration separation method, which is expected to be an industrial alternative because of its environmental protection and high efficiency.
研究领域:
化学工程
·
核能技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jihua Huang,Jinyuan Liu,Jia Yan,Chengjuan Wang,Ting Fei,Haiyan Ji,Yanhua Song,Cheng Ding,Chengbao Liu,Hui Xu,Huaming Li
Deposition of metal nanoparticles into pore could be regarded as promising strategy for promoting photocatalytic performance because it could enrich active species in limited space. Here, we deposited typical metal cocatalysts (Pt, Ag, Ni) within the pore of mesoporous graphitic carbon nitride (MPCN) via multiple vacuum-induced method. Through a series of characterization analysis of the obtained M (M = Pt, Ag, Ni)/MPCN composites, it could be confirmed that the metal nanoparticles successfully entered into the pore of MPCN . Further exploring the photocatalytic activity, the results indicate that the electrons enrichment-effect composites exhibits higher hydrogen production than physical blending composites, which is attributed to the metal nanoparticles grown and dispersed evenly within the confined mesoporous space, promoting effectively enrichment of photogenerated electron and improving the photocatalytic performance. Thereby, to investigate the metal nanoparticles deposited within the confined pore of MPCN for improving the photocatalytic performance is necessary.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2016
·Vol. 41
·期 5
·798-805
·
IF 1.578
Na Sun,Cuihua Tian,Zhenggang Xiao
In order to tailor the surface properties of propellants to meet the requirements of progressive burning and anti-erosion performance of propellant for high loading density tank guns, the surface migration and enrichment effects of fluorinated TiO 2 nanocomposite additives with low surface energy toward the air/solid interface of propellants were investigated. Fluorinated TiO 2 nanocomposites were prepared by emulsion polymerization and characterized by FT-IR spectroscopy, TEM, and TGA to obtain the information of chemical groups, morphology, and thermal stability. The propellant samples containing the fluorinated TiO 2 nanocomposite additives were manufactured by an extrusion process. The migration effect of the fluorinated TiO 2 nanocomposite additives was observed by SEM and X-ray energy dispersive analysis. The influence factors on the migration and enrichment properties of fluorinated TiO 2 nanocomposite additives in propellants were discussed. The results showed that there exists a gradient distribution of fluorine element in the additive modified propellants, indicating a significant surface enrichment of fluorinated groups inside the propellants. The composition of propellants and the chain structure of fluoropolymer also have a significant influence on the migration and enrichment properties of fluorinated TiO 2 nanocomposite additives in propellants. This study can bring forward the research of smart construction of slowing burning and anti-wear layers in the propellants.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 60
·91155-91164
·
IF 5.19
Xiang Xiangmei,Dong Kangyu,Li Zhanjun
Microplastics (MPs) have aroused tremendous attentions because of their ability in accumulating contaminants from adjacent environment. However, their capability of concentrating hydrophobic organic contaminants might be influenced by huge amounts of coexisting natural particles (NaPs). Yet, our knowledge about the relative concentrating capability of MPs versus NaPs is still rare. Herein, the distribution behavior of several hydrophobic pollutants was studied in simplified MPs/NaPs/pollutant/water quaternary systems. We found that 1-(4-(phenylzao)phenyl)azo-2-naphthol (Sudan III) had similar distribution behavior with many hydrophobic pollutants and thus was used as a model pollutant. Polyethylene (PE) film debris derived from disposable plastic wrap was the most efficient microplastic which concentrated tens of times Sudan III than coexisting NaPs including bentonite, kaolin, sawdust, and diatomite. An enrichment coefficient of over 1000 times was observed in the case of PE film debris versus quartz sand. The concentrating capability of PE film MPs was found approximately equal to biochar particles. MPs seem to have limited contribution on the long distance transportation of hydrophobic organic pollutants. However, notably, over 70% of the adsorbed Sudan III could be released back into water within 0.5 h in the presence of 0.5% sodium oleate, which is a common amphipathic matter forming micelles in digestive fluid. Microplastics might play an important vector-like role in increasing the biological accumulation of hydrophobic pollutants via intestine digestive absorption. Due to much bigger quantity of NaPs, the relative concentrating effect of MPs to hydrophobic organic pollutants over NaPs is possibly a more reasonable reference when considering their potential ecological risk.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2018
·Vol. 50
·期 1
·26-33
·
IF 2.879
Si Chen,Zhinan Guo,David K. Sang,Huide Wang,Yanhua Xu,Siying Tang,Qian Luo,Rui Cao,Xiaolei Wang,Ling Zhang,Jianghai Liao,Han Zhang,Xue-Feng Yu,Bing Zhao,Dianyuan Fan
This paper reports the fabrication of gold-patterned microarray chips for fast and ultrasensitive surface enhanced Raman scattering (SERS) detection of trace samples. By micro-nano machining based on electron-beam lithography, magnetron sputtering, and chemical modification, gold-patterned microarray chips with hydrophilic and hydrophobic periodic structures are fabricated, and a polyethylene glycol (PEG) layer is coated on the surface of the gold well, making the chips long-term stable. The hydrophilic surface of each gold well is surrounded by a hydrophobic layer, which makes the ultratrace sample amount for SERS measurement only 0.3 μl. In the detection of malachite green (MG), 4-mercaptopyridine (4-MPY), rhodamine 6G (R6G), and melamine, great enhanced SERS signals with the detection limit reaching nM level can be achieved due to the enrichment effect of the periodic structures and the hot-spots generated between the sandwich structure built on the gold wells. Such gold-patterned microarray chip is promising in fast and ultrasensitive SERS detection of various chemical and biological species with trace amount.
研究领域:
分析化学
·
纳米技术
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Wei Xinjie,Luo Xuan,Xu Shuai,Xi Fengna,Zhao Tingting
Fast, convenient, and highly sensitive detection of antibiotic is essential to avoid its overuse and the possible harm. Owing to enrichment effect and antifouling ability of ultrasmall nanochannels, the vertically ordered mesoporous silica nanochannel film (VMSF) has great potential in the development of the facile electrochemiluminescence (ECL) sensor for direct and sensitive analysis of antibiotics in complex samples. In this study, we demonstrated a flexible ECL sensor based on a cost-effective electrode covered with a VMSF for sensitive detection of clindamycin. Polyethylene terephthalate coated with indium tin oxide (PET-ITO) is applied as a flexible electrode to grow VMSF using the electrochemically assisted self-assembly (EASA) method. The negatively charged VMSF nanochannels exhibit significant enrichment toward the commonly used cationic ECL luminophores, tris(2,2-bipyridyl) dichlororuthenium (II) (Ru (bpy)32+). Using the enhanced ECL of Ru (bpy)32+ by clindamycin, the developed VMSF/PET-ITO sensor can sensitively detect clindamycin. The responses were linear in the concentration range of 10 nM–25 μM and in the concentration range of 25–70 μM. Owing to the nanoscale thickness of the VMSF and the high coupling stability with the electrode substrate, the developed flexible VMSF/PET-ITO sensor exhibits high signal stability during the continuous bending process. Considering high antifouling characteristic of the VMSF, direct analysis of clindamycin in a real biological sample, human serum, is realized.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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