Analytical Methods
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2020
·Vol. 12
·期 21
·2693-2702
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IF 2.596
Meihua Liu,Longhua Guo,Yuechun Yin,Lifen Chen,Zhitao Chen,Jingjing Liu,Bin Qiu
In this work, a novel method based on gold nanoparticle preconcentration coupled with CE for electrochemiluminescence detection of ciprofloxacin, enrofloxacin, ofloxacin, and norfloxacin in European eels was developed. The addition of gold nanoparticles induced the rapid enrichment of fluoroquinolones, which was simpler than the conventional enrichment approaches such as solid phase extraction and solid-phase microextraction. More than 100 times enrichment was observed after gold nanoparticle aggregation-based preconcentration. The CE-electrochemiluminescence parameters that affected the separation and detection were optimized. Under the optimized conditions, the linear ranges for the four fluoroquinolones were 0.090–8.0 μmol L−1 with the detection limits between 0.020 and 0.050 μmol L−1. The proposed approach showed the advantages of high sensitivity, high selectivity, a wide linear range, and a low detection limit. It was used to analyze fluoroquinolones in European eel, and the results showed that the developed method can satisfy the detection requirements for fluoroquinolone determination in aquatic products set by China and the European Union.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qianxiong Wen,Meilin Fu,Heng Chen,Shuang Pan,Chaofan Shi,Xinyue Zhang,Xiaojuan Liang,Xingen Hu,Weidong Xiang
Phosphor-in-glass (PiG) plays an indispensable role as a highly tunable and easily prepared phosphor material for new-generation high-brightness and high-collimation laser lighting (blue laser diodes + colour converters). However, at low power (<5 W), the poor thermal stability and brittleness of PiGs make it challenging to develop high-intensity, high-brightness PiG materials because of their susceptibility to rupture and sudden drop in luminous efficiency (LE) owing to thermal accumulation under high-energy laser irradiation. In this study, a performance-tunable lithium-aluminium-silicate (LAS) glass system was used to adjust the glass composition and synthesise LAS-glasses that can be sintered at low temperatures. In addition to LuAG: Ce phosphor, LuAG: Ce phosphor-in-LAS (LuAG: Ce-PiGLAS) has been successfully developed, which can withstand an 8.24-W laser irradiation without heat dissipation, achieving a luminous flux of 1248 lm and LE of 204 lm/W. Furthermore, a pre-thermal treatment was used to precipitate the lithium disilicate phase to enhance the resistance of the glass to laser ablation , resulting in a power increase to 8.62 W at 1485 lm and maximum LE increase to 212 lm/W with a 2.5% attenuation at 498 K. High-brightness illumination performance was demonstrated in both transmission and reflection modules. This study is anticipated to generate new prospects for PiG applications and accelerate the development of laser lighting.
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POLYMER
·
2023
·
IF 4.6
Junji Wei,Yajun Duan,Hao Wang,Wanping Zhang
Diphenolic acid epoxy resin (DPAE), a new type of bio-based epoxy, exhibits many attractive performances, such as high reactivity, low expansion coefficient (CTE), high glass transition temperature ( T g ) and high storage modulus . However, the dielectric constant of DPAE is not satisfied for the requirements of high frequency circuit field, which need to be further improved to expand its application in emerging area of electronic information. In this work, both dicyclopentadiene phenol epoxy resin (DPR) and cyanate ester (CE) were used to modify DPAE in order to improve its dielectric property , while keeping good heat resistance and low dimensional stability. Furthermore, the influence of curing agent types on properties of DPAE/DPR system was studied. Compared with DPAE resin, both DPAE/DPR and DPAE/CE composites exhibited higher glass transition temperature ( T g ), lower dielectric constant, lower loss tangent with good compatibility between DPAE and those two resins. Moreover, CE resin exhibited better modified effect than DPR on thermal and dielectric properties of DPAE with the same addition. For example, the dielectric constant and loss tangent of DPAE/CE with 50 wt% CE were as low as 3.4 and 0.018 at 1 MHz, respectively.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Pengju Chen,Tian Tian,Chenzhuo Zhang,Xian Tang,Zhuan Li
A series of Ce-doping nanograin Gd 2 Ce x Hf 2- x O 7 (0.0 ≤ x ≤ 2.0) ceramic samples as nuclear waste forms were prepared, and their microstructure, phase evolution, and aqueous durability were systematically studied. The results revealed that the original Gd 2 Hf 2 O 7 sample comprised a single pyrochlore structure after sintering at 1673 K, but all the Gd 2 Ce x Hf 2- x O 7 (0.5 ≤ x ≤ 2.0) samples assumed defective fluorite structures with Ce-doping. As the x Ce value increased from 0.0 to 2.0, the average grain size of the samples gradually increased from 162 nm to 599 nm, whereas the relative density (measured density/theoretical density) of the samples gradually increased from 91.12% to 93.93%. The normalized release rates of Ce element in the Gd 2 Ce 2 O 7 sample after 42 days were slightly lower than those of Hf element in the Gd 2 Hf 2 O 7 sample owing to the lower porosity of the Gd 2 Ce 2 O 7 sample, and the bond dissociation energy of Ce–O (∼795 kJ/mol) was slightly higher than that of Hf–O (∼791 kJ/mol). Moreover, the normalized release rates of all considered elements were lower than 10 −5 g m −2 d −1 , indicating that the samples had excellent chemical stability.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Wenjie Liao,Ling Zhou,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Both improving the activity and reducing SO3 emissions during selective catalytic reduction of NOx by the NH3 (NH3–SCR) process over commercial V–Ti-based catalysts remain a challenge. Herein, Ce and P cooperatively modified the VMo/Ti catalyst to address this challenge. Within the temperature range of 250–350 °C, the optimal VMoCeP/Ti catalyst achieved a NO conversion of more than 95% and maintained a SO2 oxidation ratio below 1.0%. The enhanced SCR activity of the modified catalyst could be attributed to the improvement in surface acidity and redox capacity by the addition of Ce and P, which would promote NH3 adsorption and activation. Meanwhile, Ce and P coaddition could regulate the surface structure of vanadyl species from predominantly polymeric to a more dimeric form, which could also promote the SCR reaction. More importantly, except for the suppressed sulfation of vanadium species, both a lower proportion of polymeric vanadyl species and the strong interactions among V–Ce–P species could raise the energy barrier of the decomposition of sulfated vanadium species into SO3, thereby inhibiting SO2 oxidation. This work provided novel insights into developing efficient SCR catalysts with low SO2 oxidation ratios for both the academic and industrial fields.
研究领域:
催化化学
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环境化学
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材料科学
·
化学工程
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CHEMICAL PHYSICS LETTERS
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2023
·
IF 2.8
Ruizhi Feng,Ying Zhang,Caigan Yan,Haihe Xiao,Xiaobiao Zhu,Xiaohui Wang
Electrochemical advanced oxidation processes (EAOPs) has attracted wide attention to researchers on all walks of life for the treatment of stubborn pollutants because of the strong oxidizing properties. However, the electrode materials currently developed have problems such as short life and low catalytic activity. In this work, the modification of PbO 2 electrode was started by introducing into blue nanotubes (Blue-TiO 2 -NTs) based on the titanium plate to enhance the conductivity of the electrode. Then the β-PbO 2 active layer was optimized by using cerium (Ce) and dodecyl trimethyl ammonium bromide (CTAB) through the method of electrodeposition to improve the electrocatalytic oxidation and stability. In the experiment of electrochemical oxidation, the degradation efficiency of phenol (100 mg/L) reached more than 96% after 120 min on the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode. To further investigate the optimization mechanism of the Blue-TiO 2 /PbO 2 -Ce-CTAB anode in the electrocatalytic oxidation process, the surface structure, morphology, volt-ampere charge, oxygen evolution potential, and charge transfer resistance were evaluated. The result showed that the addition of CTAB reduced the crystal particles of PbO 2 , higher specific surface area of the electrode longitudinally by the Ce element, lower oxygen evolution potential, and smaller the resistance of charge transfer. Finally, the service life of the electrode was 6792 h by the accelerated life test on the current density of 25 mA cm −2 . The energy consumption after 240 min of degradation was 0.079 kWh gCOD −1 .This research proves that the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode has potential application value in the degradation of phenol wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yangjie Fu,Yanjie Mao,Longyang Wang,Mengyi Qiu,Youran Xu,Jianying Qian,Men Tan,Kejie Zhang,Derek Hao,Qi Wang,Guoxiang Yang
Proper design and successful synthesis of photocatalysts with efficient interfacial charge transfer, strong redox capabilities, and strong environmental applications are critical. Herein, a novel Z-scheme heterojunction AgI/Ce-2MI nanocomposite with redox-retaining properties was successfully prepared by a simple precipitation method. Compared with AgI and Ce-2MI, the efficiency of the optimized Z-scheme AgI/Ce-2MI composites in photocatalytic reduction of Cr(VI) in water within 75 min could exceed 90%. The reduction rate of AgI/Ce-2MI to Cr(VI) was 0.0277 min −1 , which was 2.6 times and 6.8 times that of AgI and Ce-2MI, respectively. In addition, the cycle performance of AgI/Ce-2MI under different pH conditions was compared, and it was found that under the condition of pH= 2, its five-time catalytic activity stability showed good performance. Moreover, the enhancement process of reactive oxygen species •O 2 - and •OH were further verified by active radical capture experiment and ESR. Therefore, this study can provide a Z-scheme heterojunction nanocomposite photocatalytic process with environmental purification functions.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuohai Fang,Tonghan Yang,Wei He,Wenchao Yang,Nannan Wang,Shengshou Ma,Kaimin Shih,Changzhong Liao
High-entropy oxides have gained more attention in recent years due to their excellent performance. In this work, five new Ce-free high entropy fluorite oxides ((Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ ) were successfully synthesized by solution combustion synthesis with glycine as fuel. Their formation, oxygen vacancy, and long-term thermal stability were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. XRD results show that single fluorite phase was observed in (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ samples when sintering at 300, 600 and 900 °C, respectively, but (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample with single-phase fluorite structure can only obtain by sintering at 900 °C and 1200 °C. For (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample, single fluorite phase can be obtained at 300 °C using calculated fuel and at 900 °C with using excess fuel. In addition, all the samples may have lower crystallinity due to excess glycine. XPS results indicate that factors of sintering temperature, fuel ratio and cationic radii strongly affect the generation of oxygen vacancy, especially for the sintering temperature. Morphology of the high entropy fluorite oxides presents in sponge-like microstructure. Superior long-term stability at high temperature was found in samples (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ . The findings in this work may have great potential applications in oxygen-deficient catalyst and high temperature catalyst.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Shuai Liu,Hao Qu,Yu Mao,Lili Yao,Baolei Dong,Lei Zheng
Propyl gallate (PG) is a commonly used synthetic phenolic antioxidant in foodstuffs and industrial products. Due to the potential health risk of PG, rapid and on-site detection in food and environment samples are important to guarantee human health. Herein, we demonstrated rapid monitoring of PG by a fluorescence turn-on strategy based on a specific fluorogenic reaction between PG and polyethyleneimine (PEI). Specifically, Ce 4+ with oxidase-mimicking activity oxidized PG to its oxides, which then reacted with PEI through the Michael addition to generate the fluorescent compound. The proposed fluorogenic reaction had good specificity for PG, which could distinguish PG from other phenolic antioxidants and interferences. Furthermore, portable and low-cost organogel test kits were prepared using poly(ethylene glycol) diacrylate for quantitative and on-site detection of PG via a smartphone-based sensing platform. The organogel-based assay detection limit was 1.0 μg mL –1 with recoveries ranging from 80.2% to 106.2% in edible oils and surface water. Suitability of the developed assay was also validated by high-performance liquid chromatography . Our study provides an effective fluorescent approach to rapid, specific, and convenient monitoring of PG, which is useful for diminishing the risk of PG exposure.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2023
·
IF 3.9
Honghui Xiong,Jinglei Liu,Yongjun Zhang,Hao Wang,Enhao Sun
To reduce the coke formation, a novel Al/Si/Cr/Ce composite ceramic coating was prepared on the surface of the Cr 25 Ni 35 Nb alloy substrate by pack cementation. The microstructure, phase composition, surface morphology and element distribution of substrate and coating were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results reveal that the outer layer of the coating forms a protective layer with a high proportion of AlN and Cr 3 Si and trace amounts of Ce. The inter-diffusion layer is mainly aluminide coating (AlNi and AlFe) and transition layer contains a small amount of AlN. The anti-coking performance of the coating was assessed using naphtha steam cracking. To study coking behavior, the morphology and microstructure of the coke layer were analyzed and characterized by SEM and Laser Micro-Raman Spectrometer. The coke layer on uncoated sample has a higher focal density and is more likely to spall and peel off when subjected to coking experiment. A large number of filamentous and granular cokes appear on the surface of the uncoated sample, whereas only less granular cokes appear on the surface of the coated sample, and the coke on the uncoated sample has a more disordered and amorphous carbon structure. The coating significantly inhibited the growth of filamentous coke and reduced coke accumulation.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yukun Li,Yongfu Liu,Zhaohua Luo,Zehua Liu,Svenja Hanson,Chengheng Pang,Hui Lin,Haiming Qin,Jun Jiang
Ce/Mn/Cr: Y 3 Al 5 O 12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn 2+ and Cr 3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce 3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce 3+ to Mn 2+ /Cr 3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn 2+ /Cr 3+ doping concentration, the lifetime of Ce 3+ , quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yunlong Li,Miao Liu,Yixian Liu,Lilong Zhou,Jilong Han,Zhengjie Li,Jimmy Yun,Runjing Liu
Two kinds of Ce-doped UiO-66 were synthesized by using CeCl 3 ·7H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 as cerium precursors, namely Ce(III)- and Ce(IV)-UiO-66. The effect of valence states of cerium precursors on adsorption performance towards Rhodamine B (RhB) was investigated for the first time. Ce atoms are in two valence states of +3 and + 4, where Ce 3+ ions turn their surfaces negatively charged. The higher cerium content (24.8%) and ratio of Ce 3+ /Ce 4+ ions (1.4:1) of Ce(IV)-UiO-66 made its surface more negatively charged, which is contributed to form stronger electrostatic interaction with cationic dyes. The adsorption amounts of RhB were 239.5 mg/g and 431.7 mg/g for Ce(III)- and Ce(IV)-UiO-66, which are 2.38 and 5.11 times higher than pristine UiO-66, respectively. The well-fit Langmuir model and pseudo-second-order model suggest a monolayer chemisorption process. The adsorption mechanism suggests that the electrostatic interaction and the complexation interaction between Ce 3+ and RhB are dominant factors affecting RhB adsorption. Since Ce 3+ severed as adsorption sites, the higher Ce content and stronger electrostatic interaction of Ce(IV)-UiO-66 together promoted its RhB adsorption than Ce(III)-UiO-66. The obtained results help to understand how the mixed-valences of incorporated metals affect the adsorption behaviors of bimetallic MOFs deeply.
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