CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yuan-Pei Lan,Chaoyi Chen,Junqi Li,Xuewen Xia,Xisong Mao,Hao Zhou
Homogeneously Eu 3+ doped LaOCl single crystals are firstly synthesized in a molten KCl-LiCl flux, and the well-shaped LaOCl:Eu 3+ polyhedral micro-plates exhibit noticeable luminescent properties. The bulk LaOCl:Eu 3+ micro-plate with a width of 1.03 μm and 1.37 μm in length shows a single crystal characteristic with the crystal face orientation of [00 1 ‾ ]. Both XRD patterns and EDS mapping indicate that the Eu 3+ ions have been homogeneously doped into LaOCl lattice. LaOCl:Eu 3+ nucleuses generated in molten KCl-LiCl flux at even 350 °C benefited to the decomposition of La(OH) 3 :Eu 3+ precursor, and polyhedral LaOCl micro-plate is easily formed in molten KCl-LiCl salt due to the solid-ionic reaction and crystal growth. The luminescent properties of LaOCl:Eu 3+ are firstly enhanced and then weakened with the increasing concentration of the doped Eu 3+ , 6% Eu 3+ doped LaOCl:Eu 3+ exhibits the best luminescent properties which can be used as a potential LED material.
研究领域:
材料科学
·
光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhiyao Chu,Junqi Li,Yuan-Pei Lan,Chaoyi Chen,Jian Yang,Deyang Ning,Xuewen Xia,Xisong Mao
A ternary photocatalyst of LaOCl/CeO 2 -g-C 3 N 4 was designed and firstly synthesized by a facile KCl–LiCl molten salt method. The 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 with a 6: 4 weight ratio of LaOCl to CeO 2 has an optimal degradation ratio (nearly 100%) for methylene blue (MB) with an impressive cyclic stability. Both of adsorption and photodegradation contribute to the high MB removal ratio, and kinetic study results show that the rate constant of photocatalytic degradation route is 0.0174 min −1 , which is less than that of adsorption process (2.4406 min −1 ). The excellent adsorption performance of 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 is attributed to its negative zeta potential (−35.40 mV) and larger average pore size. The photochemical characterizations suggest that the 60 %LaOCl/40 %CeO 2 -g-C 3 N 4 form a dual Z-scheme heterojunction , which enhances its separation efficiency of photogenerated e - / h + with an outstanding redox ability, and further promotes the photocatalytic activity.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 3
·1-12
·
IF 2.253
Mao Xisong,Xia Xuewen,Ning Deyang,Li Junqi,Chen Chaoyi,Lan Yuan-Pei
Molten salts synthesis (MSS) is a simple and potential technique for ceria nanoparticles (NPs) production, but the relevant effects of salt medium and cerium precursor on the synthesized ceria NPs need further attention. In the present work, we investigated the influences of frequently employed KCl–LiCl and KOH–NaOH molten flux and typical inorganic cerium precursors on the characterizations and photocatalytic property of ceria NPs. Results show that the CeO 2 NPs obtained in molten KOH–NaOH flux have smaller particle/crystal sizes but more serious agglomeration than that from KCl–LiCl flux. UV–Vis DRS spectra reveal that the ceria synthesized in molten hydroxides from the cerium nitrate precursor has the narrowest band gap of 2.87 eV in studied ceria samples. The ceria NPs obtained from KCl–LiCl flux have wider band gaps of 3.15–3.29 eV and faster recombination rates of photo-generated e − and h + . It was found that the ceria NPs obtained in molten KCl–LiCl salt show better photocatalytic activities for methylene blue (MB) degradation and may be due to the uniform size distribution and well-dispersed particles.
研究领域:
材料科学
·
化学
·
纳米技术
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 4
·1353-1365
·
IF 1.6
Wang Zhaoyang,Shen Yubo,Zhang Yinshan,Liu Yuhui,Dong Zhimin,Quan Meiyang,Yu Fengtao,Cao Xiaohong,Zhang Zhibin,Wang Yingcai,Liu Yunhai
In order to improve the utilization of spent fuel, electrolysis is used to recover fissile elements from nuclear waste samarium. The electrochemical behaviors of Sm(III) and Pb(II) were examined by CV, SWV, and OCP techniques in LiCl–KCl molten salts at 773 K. The redox mechanism of Sm(III) ions on the liquid Pb thin film electrode was analyzed. The results demonstrate that Sm(III) electro-reduction at the inert W electrode only occurred in a soluble–soluble electrochemical transition Sm(III)/Sm(II). Additionally, the kinetic parameters of samarium and lead ions were computed. The activation energies of diffusion for Sm(III) and Pb(II) were 32.92 kJ mol −1 and 35.21 kJ mol −1 , respectively. SmPb 3 and Sm 2 Pb intermetallic compounds were derived using constant potential electrolysis and constant current electrolysis at the Pb electrode in a molten salt system. The cathodic deposition output was characterized by XRD and SEM–EDS. The ICP-AES results showed that the average extraction ratio of Sm on the Pb electrode was about 94.23%.
研究领域:
核化学
·
电化学
·
材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Can Xu,Xianwei Hu,Jiangyu Yu,Pengwei Li,Aimin Liu,Shaohua Luo,Zhongning Shi,Zhaowen Wang
The study on the ionic structure of SmCl 3 -KCl-LiCl molten systems is of guiding significance for the practical production of metal samarium and samarium alloys via Molten salt electrolysis (MSE) using this system as electrolyte. Based on density functional theory (DFT), the possible ionic groups in SmCl 3 -KCl-LiCl molten system were simulated by Gaussian and GaussView program and their theoretical Raman spectra were calculated. The calculated spectra were then compared with the experimental Raman spectra of molten 0.1–2 mol% SmCl 3 -(41 mol% KCl-59 mol% LiCl) to identify the ionic groups which might have existed. It is thought that SmCl 4 - , SmCl 6 3- , Sm 2 Cl 8 2- and Sm 2 Cl 7 - exist in the molten system. When the temperature is unchanged, the “lifetime” of SmCl 6 3- is reduced while those of SmCl 4 - , Sm 2 Cl 8 2- and Sm 2 Cl 7 - is increased with the increase of SmCl 3 content. Within the temperature range of 773–809 K, when the content of SmCl 3 remains unchanged, the “lifetime” of these complex ions decreases with the increase of temperature. Besides, the relative content of SmCl 6 3- decreases with the increase of temperature. The wave function analysis of the four kinds of Sm-Cl ionic groups was also carried out using Multiwfn program. The net atomic charge of each ionic group, the direction of electron migration during the formation of the ionic groups, as well as the most prone to electrophilic and nuclear reactions of each ionic group, and the order of bond breaking during chemical reactions for the four groups were obtained.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 8
·e202404358
·
IF 2
Yuanpei Lan,Zhou Zou,Shuang Liu,Arun Murali,Baolei Wang,Qingwei Jia,Shirong Wang
Graphical A series of Fe 2 O 3 ─CeO 2 ─C 3 N 4 (Fe–Ce–CN) catalysts were synthesized by a KCl–LiCl molten salt method. The 0.5 wt.% Fe 2 O 3 loaded Fe–Ce–CN which synthesized at 550 °C for 4 h had an excellent photocatalytic activity towards to tetracycline (TC) degradation due to the significantly boosted separation efficiency of photoexcited electron-hole pairs. In this work, Fe 2 O 3 ─CeO 2 ─C 3 N 4 (Fe–Ce–CN) catalysts were synthesized in the KCl–LiCl molten salt system, and their photocatalytic properties towards tetracycline (TC) degradation in wastewater were studied. The obtained 0.5 wt.% Fe–Ce–CN, synthesized at 550 °C for 4 h with 0.5 wt.% Fe 2 O 3 , had the highest photocatalytic degradation efficiency for tetracycline (TC), which achieved degradation ratios of 98.3% and 96.9% for TC solutions at concentrations of 20 mg/L and 80 mg/L, respectively. Characterizations indicated that the 0.5 wt.% Fe–Ce–CN had significantly enhanced photo-excited electron-hole separation efficiency and promoted photocatalytic activity. Additionally, superoxide radicals · O 2 − and electrons ( e − ) were identified as the key reactive species for TC degradation with 0.5 wt.% Fe–Ce–CN, attributing to its band structure. The possible enhancement mechanism was discussed and proposed. The findings in this work provide a new approach to preparing high-performance photocatalysts and offer insights into the Fe–Ce–CN ternary photocatalysts.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chao Ma,Li Feng,Junpeng Cui,Zhipeng Hu,Qianqian Chu,Shipeng Xu,Weiqian Chen,Bo Chen,Putsiata Artur,Luoyi Zhang
To improve the service reliability of components used during spent nuclear fuel electrorefining, La 2 Zr 2 O 7 (LZO) protective coatings were prepared on SS 316L by atmospheric plasma spraying (APS) followed by vacuum annealing. The effects of annealing temperature and holding time on the phase structure, apparent porosity, and surface wettability of the LZO coatings were systematically investigated. The optimized coating was then exposed to KCl-LiCl molten salt at 600 °C for up to 640 h to evaluate its corrosion behavior and degradation mechanism. Annealing at 1200 °C for 2 h reduced apparent porosity from 18.96% to 8.21% and suppressed spreading of the salt-containing test solution. Within the initial 80 h, the as-sprayed and annealed coatings gained 1.3 and 0.6 mg·cm -2 , respectively, with apparent mass-change rates of 0.015 and 0.0075 mg·cm -2 ·h -1 . Both coatings shifted from mass gain to mass loss during 80-160 h, and the apparent mass-change rate of LZO-C640 reached -0.0525 mg·cm -2 ·h -1 . During 160-320 h, the apparent rates became positive as connected defects enabled deeper salt penetration and local interaction with the NiCrAlY bond coating. Preferential degradation of Al- and Cr-rich regions exposed and redistributed Ni-bearing material. NiO and NiCr 2 O 4 were subsequently detected at 320 h as secondary products. LaOCl was also detected at 320 h, whereas LiAlO 2 appeared after extended exposure. Throughout the final stage of 320-640 h, LZO-C640 maintained a low positive rate of 0.0075 mg·cm -2 ·h -1 . In contrast, the cumulative mass-change of H/LZO-C640 increased from -0.6 to -0.3 mg·cm -2 as its apparent rate approached zero. After 640 h, the annealed coating retained its overall skeleton, whereas the as-sprayed coating underwent top-layer disintegration. These results indicate that vacuum annealing did not completely prevent degradation, but limited molten-salt ingress and improved the long-term corrosion resistance of LZO coating.
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高影响因子
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