JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 5
·1-9
·
IF 2.132
Ma Zhifei,Yang Yu,Yang Tianxue,Wu Daishe,Peng Xing,Xi Beidou,Jiang Yonghai,Jia Yongfeng
To evaluate the longevity of the iron-activated persulfate (PS) oxidation degradation of 2,4-dinitrotoluene (2,4-DNT), zero-valent iron (ZVI), and three different micron-scale iron oxides were used as catalysts for the activation of PS. It was revealed that 2,4-DNT was degraded more effectively by ZVI and maghemite (γ-Fe 2 O 3 ) compared to that of hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) catalyst treatments. Denitration of 2,4-DNT and oxidation of nitro groups as nitrate occurred by Fe 0 /PS and γ-Fe 2 O 3 /PS. When the 2,4-DNT removal rate was 1%, the generated sulfate concentrations of Fe 0 /PS and γ-Fe 2 O 3 /PS were 2.08 mg/L and 1.27 mg/L, respectively. Only micron scale γ-Fe 2 O 3 could activate PS for 2,4-DNT removal. ZVI was cycled and able to activate PS through multiple rounds. The size of the corrosion products of ZVI was more than 100 nm, and the particle size gradually increased in the cycling process. The first cycle of Fe 0 resulted in 45% removal of 2,4-DNT in 360 min. The 2,4-DNT removal efficiency (68.15%) increased after the second cycle, reaching the best removal efficiency in the fourth cycle. Oxidation products formed during degradation covered the ZVI surface, forming a shell. Adsorption of organic pollutants to this shell aids in the removal efficiency of 2,4-DNT and longevity of ZVI in groundwater.
Graphical abstract
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 5
·1418-1426
·
IF 2.372
Ma Yuan,Liu Jiao,Chu Mo,Yue Junrong,Cui Yanbin,Xu Guangwen
Abstract The key challenge for CO 2 methanation, an eight-electron process under kinetic limitation, relies on the design of non-noble metal catalysts so as to achieve high activity at low reaction temperatures. In this work, four Ni-based catalysts with different supports were prepared and tested for CO 2 methanation at 250–550 °C in a fixed bed quartz reactor and further characterized to reveal the structure–function relationship. The Ni-based catalysts followed an activity order of Ni/CeO 2 > Ni/Al 2 O 3 > Ni/TiO 2 > Ni/ZrO 2 , especially at temperatures lower than 350 °C. H 2 -TPR and TPD results indicated that the interaction between nickel and support was strong and the metallic nickel was well dispersed in the Ni/Al 2 O 3 catalyst, while more amount of CO 2 was adsorbed on the weak basic sites in the Ni/CeO 2 catalyst. By establishing the correlation between the catalytic performance and the catalyst structure, it was found that the Ni nanoparticles and basic support serve as H 2 and CO 2 active centers respectively and cooperatively catalyze CO 2 methanation, resulting in high low-temperature reaction activity. Graphic Abstract High CO 2 conversion was achieved over Ni/CeO 2 catalyst at 300 °C for its high H 2 uptake on Ni nanoparticles and high CO 2 adsorption capacity on the support with weak basic sites and cooperatively to catalyze CO 2 methanation.
研究领域:
催化化学
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 103
·期 3
·1475-1483
·
IF 3.67
Liu Zihui,Xue Aifang,Chen Hao,Li Shengqing
Time-resolved inductively coupled plasma mass spectrometry (ICP-MS) for studying cellular heterogeneity or detecting metals in single cells draws increasing attention in the recent years. Considering the full width of a single-cell event is about 0.5–0.9 ms, dependent on the duration of the ion plume generation in typical ICP condition, dwell time shorter than the transient event was suggested for fully profiling it. Herein we investigated the effect of dwell time (0.1–10.0 ms) on the signal profiles of single-cell events, signal-to-background ratio, duty cycle of detection, the limit of detection, and the ability of cell counting by the time-resolved ICP-MS, using yeast ( Saccharomyces cerevisiae ) cells as example. Two calibration equations with respect to the length of dwell time (0.1 ms or 5.0 ms), simply using dissolved metal standard solutions, were constructed and successfully applied to the determination of K, Mg, Zn, Mn, and Cu in single yeast cells. The limit of detection (LOD, fg per cell) obtained at dwell time 0.1 ms was 1.68 (K), 0.29 (Mg), 0.17 (Zn), 0.01 (Mn), and 0.02 (Cu) for single-cell analysis of yeast cells; the LOD (fg per cell) at 5.0 ms was 80.0 (K), 10.3 (Mg), 1.6 (Zn), 0. 14 (Mn), and 0.24 (Cu), respectively. The results showed that a short dwell time leading to high signal-to-background ratio and low LOD was a prerequisite for the quantitative analysis of ultra-trace content of metals in single cells.
研究领域:
分析化学
·
生物化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 13
·16754-16766
·
IF 4.223
Liu Si-Yu,Yu Wen-Jing,Wang Yi-Ru,Shao Xue-Ting,Wang De-Gao
Illicit drug use has long been a key issue of international concern, and the true situation is unknown to the relevant authorities. To develop a profile of comprehensive consumption patterns of illicit drugs in China, data from 34 wastewater treatment plants in 25 cities were collected to analyze four classes of drugs, including amphetamine-type stimulants, opioids, ketamine, and cocaine. They were identified and quantified in samples using methods based on gas chromatography coupled to mass spectrometry. According to the wastewater-based epidemiology (WBE) approach, an analysis of the consumption pattern was performed regarding per inhabitant consumption based on the revised metabolic rate. The consumption quantity of illicit drug and precursor was divided into four categories based on statistical difference analyses: methamphetamine and ephedrine (precursor) were the predominant drugs in the first category, followed by ketamine and heroin in the second category, methcathinone and 3,4-methylenedioxymethamphetamine (MDMA) in the third category, and cocaine and methadone in the fourth category. There were distinctive spatial patterns: heroin and cocaine consumption was higher in Southern China than in Northern China, heroin consumption was higher in Western China than in Eastern China, and the consumption of each drug differed across seven regions of China, especially with ephedrine and methcathinone consumption higher in North China; heroin consumption higher in Southwest, Central, and Northwest China; and ketamine and MDMA consumption higher in East, South, and Central China. Compared with findings in previous studies, there were temporal patterns, in which ketamine consumption presented a downward trend but heroin remained stable. Based on correlation analyses, there were the polydrug abuse patterns between heroin and cocaine, methcathinone and ketamine, and cocaine and MDMA. In general, this study based on WBE provides a comprehensive evaluation of drug consumption in China. Graphical abstract
研究领域:
公共卫生
·
毒理学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19477-19486
·
IF 2.195
Xu Chen,Feng Yan,Mao Zemin,Zhou Yingjie,Liu Li,Cheng Weihao,Wang Jinpei,Shi Hao,Liu Xiang
Metal–organic frameworks as electrode materials have attracted significant attention due to their high specific surface area and flexible structures. Compared with the metal–organic frameworks derived products, the direct applications of metal–organic frameworks as electrode materials are rather seldom because of their insufficient conductivity. Herein, binary nickel–cobalt based metal–organic frameworks are developed as electrode materials for supercapacitor. The binary metal based metal–organic frameworks behave better electrochemical performance than the sole metal base metal–organic frameworks, and this is majorly due to the synergistic effect between the binary metals. The highest capacitances of 978.9 F g −1 at 1 A g −1 at a nickel/cobalt ratio of 2:4 can be obtained. Meanwhile, the nickel–cobalt metal–organic framework presents excellent stability even after being run for 3000 cycles. The Ni–Co-2-4-MOF//AC asymmetric capacitor shows a high energy density of 14.77 Wh kg −1 and power density of 8477 W kg −1 . These results show that Ni–Co-MOFs have a promising applications in supercapacitor electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 1
·575-581
·
IF 1.137
Cai Fei,Yan Heng,Fan Wenbin,Li Shihong,Xu Jianfeng,Wang Zheng,Tang Xiaobin
A mild HPLC method for the quality control of [ 18 F]sodium fluoride solution for injection was developed. The method used anion exchange column for separation, UV and online radio-detectors for fluoride content and fluorine-18 determination. A mixture of 100 mM sodium acetate and 25 mM sodium chloride was chosen as mobile phase. The method was validated for system suitability, specificity, fluoride concentration and radiochemical purity determination with good linearity, accuracy and precision. The good robustness of the system was also verified, enabling routine analysis of fluoride content and radiochemical purity of the [ 18 F]sodium fluoride product.
研究领域:
药学
·
核医学
✓ 已验证
DOI
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 12
·期 1
·41-49
·
IF 2.786
Lan Zhou,Lu Yangcheng
Benzyl iodide, an important organic synthesis intermediate, has high reaction activity as well as high commercial value due to its weakest carbon-halogen bond. However, the development of direct iodination of toluene for benzyl iodide is limited by the fact that the C-I bond is easily decomposed under heat or light. In this work, the photoiodination of toluene to synthesize benzyl iodide in the I 2 /PhI(OAc) 2 / t BuOH system was carefully investigated in the flow photoreactor under LEDs irradiation. The reaction window suitable for the reaction kinetic characteristics recognition was revealed with the considerations of the effects of various parameters including light color, light intensity, reaction temperature, residence time, and usage of each substrate. And an optimized result is to achieve 95.83 % of yield and over 99 % of selectivity under a red light with 2.05 mW/cm 2 of light intensity at 80 o C after 15 min reaction. The reaction kinetic model coupling the iodination reaction (photo and thermal reaction) with the decomposition reaction is established, which fits well the experimental results and provides fundamentals for process design and optimization. Graphical abstract
研究领域:
有机化学
·
化学工程
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2020
·Vol. 9
·期 1
·1-11
·
IF 13.714
Xing Jun,Zhao Chen,Zou Yuting,Kong Wenchi,Yu Zhi,Shan Yuwei,Dong Qingfeng,Zhou Ding,Yu Weili,Guo Chunlei
Defect density is one of the most significant characteristics of perovskite single crystals (PSCs) that determines their optical and electrical properties, but few strategies are available to tune this property. Here, we demonstrate that voltage regulation is an efficient method to tune defect density, as well as the optical and electrical properties of PSCs. A three-step carrier transport model of MAPbBr 3 PSCs is proposed to explore the defect regulation mechanism and carrier transport dynamics via an applied bias. Dynamic and steady-state photoluminescence measurements subsequently show that the surface defect density, average carrier lifetime, and photoluminescence intensity can be efficiently tuned by the applied bias. In particular, when the regulation voltage is 20 V (electrical poling intensity is 0.167 V μm −1 ), the surface defect density of MAPbBr 3 PSCs is reduced by 24.27%, the carrier lifetime is prolonged by 32.04%, and the PL intensity is increased by 112.96%. Furthermore, a voltage-regulated MAPbBr 3 PSC memristor device shows an adjustable multiresistance, weak ion migration effect and greatly enhanced device stability. Voltage regulation is a promising engineering technique for developing advanced perovskite optoelectronic devices.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 3
·1180-1188
·
IF 2.047
Ji Xinran,Zhou Ke,Zhao Ye,Sun Meiling,Dong Shijun,Zhang Hongbo,Cao Hechun,Zheng Hui,Wu Qiong,Zhang Yang
The regulation of magnetic and dielectric properties for yttrium iron garnet ferrites by ion doping is highly desirable in microwave devices. In this work, yttrium iron garnet ferrites co-doped with Pr-Zn-Zr atoms with the chemical formula Pr x Y 3-x Zn 0.1 Zr 0.1 Fe 4.8 O 12 (x = 0, 0.1, 0.15, and 0.2) were prepared. The dependence of the crystal structure, microstructure, magnetic, and dielectric properties of the obtained samples on the Pr doping concentration was investigated. The morphologies and crystal structure characterizations confirm that the Pr ion has effectively doped in the yttrium iron garnet ferrites and increased the lattice parameter and grain size. The magnetic characterization shows that the saturation magnetization also increases with the Pr concentration and obtains a maximum value of 27.68 emu/g at x = 0.15. Additionally, the doping of Pr increases the magnetic anisotropy constant K 1 which increases ferromagnetic resonance linewidth. Lastly, the dielectric properties measurement further indicates that Pr doping improves both real and imaginary parts of permittivity, and the highest value of the real part of the permittivity is obtained at x = 0.15. Consequently, the crystal structure, microstructure, magnetic properties, and dielectric properties of garnet ferrite can be effectively regulated by the Pr doping concentration, and excellent properties of the ceramic can be obtained at x = 0.15, which allows potential applications in microwave devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21164-21177
·
IF 2.478
Liu Jikang,Ding Yuqing,Li Chongyang,Bai Wangfeng,Zheng Peng,Zhang Jingji,Zhai Jiwei
Although high-applied electric field can usually generate high energy storage performance (ESP) for most dielectric materials, the presence of high risk at high electric field and large cost of insulation technology are the main obstacles that critically restrict the actual applications of dielectric ceramics in the energy storage area. Herein, simultaneously realizing high energy storage density ( W rec )/efficiency ( η ) and charge–discharge performance under low working electric fields is proposed in relaxor ferroelectrics via combining the non-ergodic and ergodic relaxor state (NR-ER) and dominated ER features. Based on this idea, a high W rec (2.03 J/cm 3 ) and favorable η (72%), together with excellent frequency dependence (0.5–100 Hz), moderate temperature stability (20–140 °C, and satisfactory fatigue endurance (10 0 –10 5 cycles), can be simultaneously achieved in 0.3[0.955(Bi 0.5 Na 0.5 )TiO 3 –0.045Ba(Al 0.5 Ta 0.5 )O 3 ]–0.7Sr 0.3 (Bi 0.7 Na 0.67 Li 0.03 ) 0.5 TiO 3 (BNT–BAT–0.7SBNLT) ceramic at a low electric field of 200 kV/cm. Moreover, the indicated ceramics also possess great charge–discharge performance at 140 kV/cm, featured by a large power density P D of 46.2 MW/cm 3 , discharge energy density W d of 0.62 J/cm 3 , fast charge-discharge rate t 0.9 of 210 ns, and excellent cycling reliability. Thus, the designed BNT–BAT–0.7SBNLT ceramic possesses superior comprehensive ESP under low electric field, which has broad prospects in practical high-power ceramic capacitors applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3453-3464
·
IF 2.936
Zhao Mengqi,Pan Zhiquan,Chen Qingrong,Zhou Hong
Diosgenin is an important intermediate of drugs, the special structure similar to hormone determines its important position in drug synthesis. Diosgenin was generally obtained by sulfuric acid hydrolysis of dioscorea, which produced too much acid wastewater, and caused environmental issues. A new solid acid based on TiO 2 was designed and synthesized through the sulfonation of the prepared TiO 2 , the structure was fully characterized by FTIR, SEM, EDX, XPS and XRD. Under the optimized conditions, the yield of diosgenin reached 30.75%, the value was much higher than that of H 2 SO 4 of the same quality. To explore the factors that affect the yield, the usage amount of the solid acid, the temperature, the solvent volume and the extraction time were taken into the analysis, and the results of the recycling experiments indicated that the prepared solid acid can be used for three time and maintain its high activity. A highly efficient solid acid catalyst for diosgenin extraction from saponins was successfully synthesized, and the extraction method was environmentally friendly. Graphical Abstract
研究领域:
药物化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 32
·期 21
·25725-25734
·
IF 2.22
Wang Ruoming,Bai Pengwei,Zhao Biao,Bai Zhongyi,Guo Xiaoqin,Zhang Rui
In this work, the honeycomb-like SnO 2 with excellent microwave absorbing (MA) capability was successfully prepared by a template method. Furthermore, honeycomb-like SnO 2 configuration with various pore sizes can be prepared by altering the size of polystyrene (PS) nano-sphere. The microstructure, crystallographic structure, elemental chemical state and MA properties of honeycomb-like SnO 2 were measured by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric-difffferential scanning calorimetry (TG-DSC) and Vector network analyzer (VNA), respectively. Interestingly, the microwave absorption properties were determined by their honeycomb configurations. Furthermore, honeycomb SnO 2 prepared using 148 nm PS spheres as template, presented a minimal RL of −47.4 dB at 11.1 GHz with the layer thickness of 3.2 mm. Meanwhile, the value of RL less than -10 dB was found in the range of 9.8–15.2 GHz. The combination of interfacial polarization, dielectric loss and cellular structure can inhibit the propagation of electromagnetic waves and dissipate microwave energy through heat or other forms. It is believed that the honeycomb-like structures could be expected to be candidates for a new generation of absorbing materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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