JOURNAL OF RARE EARTHS
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2025
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IF 7.2
Yinzhong Liu,Xuechun Yang,Yun Guo,Lingchao Wang,Xiaoshun Wei,Qingjie Wang,Yiyu Qiao,Xiaotao Zhu,Lingli Cheng,Zheng Jiao
n -Butanol, a volatile organic compound with relatively low toxicity, requires precise detection for public health and environmental safety. In this research, metal-organic framework (MOF)-ZnO nanostructures (zinc oxide nano-materials with the utilization of metal-organic frameworks as precursors) doped with rare earth elements (Ce, Eu, and Er) were synthesized via a homogeneous co-precipitation route. The produced samples were comprehensively characterized employing X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy to evaluate the morphological, structural, and optical characteristics. The gas-sensing capabilities of the RE (Ce, Eu, Er)-ZnO series of sensors were subsequently assessed in comparison to those of pristine MOF-ZnO by adjusting the doping type and ratio of rare earth elements to optimize the sensor performance. Among the materials tested, the 0.08 wt% Eu-ZnO sensor exhibits the best-of-breed sensitivity and selectivity, achieving the impressive response value of 616.11 and the detection limit of 361.52 ppb working at 230 °C under 100 ppm of n- butanol exposure, this achievement attains 8.7 times greater than that of pristine MOF-ZnO (70.72). Moreover, with the aid of ultraviolet excitation, the performance of the 0.08 wt% Eu-ZnO sensor is further enhanced, with the sensitivity response elevating to 1000.65 and 4.3 times greater than that of pristine MOF-ZnO (231), leading to the lower detection limit of 259.70 ppb at 220 °C. These findings underscore the significant potential of rare earth incorporation and UV irradiation playing as the synergistic strategy to augment the gas-sensing capabilities, preeminently in the detection of low-concentration volatile organic compounds.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Qianqian Qiao,Zerui Liu,Fei Hu,Ziqiang Xu,Ying Kuang,Cao Li
Catalytic medicine, using enzymes or nanozymes, is an emerging method for cancer treatment. However, its applicability is limited by the low catalytic activity in the tumor microenvironment (TME). In this work, a versatile and synthesis-friendly nanozyme, CeO 2 Mn 1.08 O x nanoclusters, is prepared. This novel Ce─Mn heterojunction is formed by oxidation of CeO 2 nanoparticles through H 2 SO 4 /KMnO 4 . CeO 2 Mn 1.08 O x exhibits high multi-enzymatic catalytic activities and acts as a catalase (CAT), peroxidase (POD), and oxidase (OXD) mimics under acidic conditions. It can regulate the TME by relieving hypoxia and consuming endogenous glutathione (GSH). Glucose oxidase (GOx) is then incorporated into CeO 2 Mn 1.08 O x and linked with poly(ethylene glycol) (PEG) to obtain the cascade enzyme system (Ce─Mn)-PEI/GOx-PEG. CeO 2 Mn 1.08 O x exhibits CAT-like properties, which sensitize GOx-based starvation therapy, and POD- and OXD-like properties, which generate highly cytotoxic reactive oxygen species (ROS) in cancer cells. The glucose catabolic product, H 2 O 2 , is also used to generate O 2 and ROS. In addition, the heterojunction structure provides CeO 2 Mn 1.08 O x with near-infrared (NIR) photothermal capability, making it suitable for photothermal therapy (PTT). Density functional theory (DFT) calculations provide possible reasons for the high catalytic activity and photothermal capability of CeO 2 Mn 1.08 O x . When combining mild PTT with catalytic therapy, the cascade enzyme system (Ce─Mn)-PEI/GOx-PEG can efficiently ablate tumors.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhikang Li,Guoping Zhao,Chen Sun,Jianan Li,Chengzhe Xie,Yang Hou,Zhongjian Li,Lecheng Lei,Bin Yang
The electrochemically upgrading sulfate to high-value persulfate (PS) offers significant potential but suffers from impaired selectivity due to competing oxygen evolution reactions (OER). Boron-doped diamond (BDD) electrodes serve as ideal anodes for PS electrosynthesis due to their wide electrochemical window, low adsorption propensity, and superior hydroxyl radical ( OH) generation capacity. Herein, we engineered BDD anodes via a facile one-pot deposition-calcination strategy to construct a Ce 0.1 Sn 2.2 Sb 0.25 O x catalytic layer, dramatically enhancing OH production. The modified electrode exhibited substantially elevated oxygen evolution potential (increasing from 2.726 to 2.905 V vs. RHE), achieved a record Faradaic efficiency (FE) of 90.22 % for PS synthesis at 250 mA/cm 2 , and reached 66.7 μmol/min/cm 2 . The resulting PS solution was concentrated to 1.16 mol/L (15.3 wt%), the highest value reported to date for electrochemical PS synthesis. Electron paramagnetic resonance (EPR) studies confirmed the significant augmentation in OH yields. The incorporation of Sb refined SnO 2 crystallites and strengthened H 2 O adsorption, whereas trace Ce doping markedly improved the stability of catalytic layer and facilitated electron transfer, as evidenced by only a 0.95 % activity loss after 30 successive electrolysis cycles. Mechanistic investigations reveal that the catalytic layer preferentially promotes the indirect oxidation pathways via OH mediation, leading to a marked increase in PS selectivity. This work establishes a simple, cost-effective, and scalable BDD modification strategy with significant industrial potential for electrochemical PS synthesis and waste sulfate resource valorization.
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Nano Research
·
2024
·
IF 9.5
Li Rushuo,Ban Tao,Zhao Danfeng,Lin Jing,Liu Zhiyuan,Wang Linmeng,Huang Xiubing,Tao Zhiping,Wang Ge
Olefin hydrogenation under mild condition is crucial and challenging for industrial applications. Herein, defective UiO-66(Ce) was constructed by using cyanuric acid as the molecular etching “scissors” and further to synthesize heterogeneous catalyst with highly dispersed RuNi nanoparticles (Ru 1 Ni 1.5 @UiO-66(Ce)-12 h). The construction of Ce-O-Ru/Ni heterogeneous interfaces and Ni–Ru bonds provide electron transfer channels from Ce-oxo clusters and Ni species to Ru species. Furthermore, the microenvironment and electronic structure of Ru 0 active sites were synergistically regulated by adjusting the content of metal-organic frameworks (MOFs) defects and Ni promoter, thereby enhancing the adsorption and activation ability of H–H and C=C bonds. Therefore, Ru 1 Ni 1.5 @UiO-66(Ce)-12 h achieved dicyclopentadiene saturated hydrogenation (100% conversion) to tetrahydrodicyclopentadiene (∼ 100% selectivity) under mild condition (35 °C, 1 MPa) with only 25 min. Meanwhile, the sample exhibited excellent structural stability after 6 cycles test. This study provides a promising strategy for the rational design of remarkable noble metal-based catalysts for practical applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
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IF 4.326
Jun Xiao,Mengmeng Wang,Yaru Wang,Xunxun Li,Jiaqin He,Yunchong Liu,Qingfeng Xu,Hua Li,Najun Li,Dongyun Chen,Jianmei Lu
Catalytic oxidation is one of the most promising methods to remove toluene; manganese-cerium catalysts have high activity in the catalytic oxidation of toluene. Herein, nano-sized ZSM-5 was synthesized using a simple hydrothermal method, and catalysts with different Mn and Ce contents were prepared via alcohol-induced redox precipitation at room temperature. In addition, zeolite provides sufficient surface area for the dispersion of manganese cerium catalysts and plays a role in concentration and enrichment in the catalytic conversion of toluene. Based on the experimental characterization results, the 20Ce/M1Z1 catalyst exhibited the best catalytic activity, achieving 90% toluene conversion at 215 °C. Moreover, the catalyst still has excellent catalytic activity in humid environments. This work provides a new strategy to expose more active sites and enhance toluene adsorption, which provides a reference for the development of more efficient catalysts in the future.
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JOURNAL OF SEPARATION SCIENCE
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2020
·Vol. 43
·期 11
·2193-2200
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IF 2.878
Lei Xu,Weiqi Meng,Jing Lu,Fengjuan Cui,Lidi Gao,Lin Chen,Yang Xin
A sensitive approach of capillary electrophoresis coupled with field-amplified sample injection and transient isotachophoresis was developed for the simultaneous determination of two β-blockers: sotalol and metoprolol. In this dual focusing technique, the samples were prepared via only dissolution in ultrapure water and then injected electrokinetically. Phosphate acted as both the background electrolyte and the leading electrolyte. Its optimized concentration was 80 mM. A total of 25 mM of glycine was used as the terminating electrolyte. Under optimum conditions, good separation of sotalol and metoprolol was achieved within 10 min. In comparison with the conventional method, the sensitivity enhancement factors were up to 1031 and 919 for sotalol and metoprolol, respectively. The proposed method was employed in the determination of sotalol and metoprolol in spiked human urine samples. The limits of detection and limits of quantitation obtained via ultraviolet detection were 5 and 12 ng/mL, respectively, for sotalol, and 10 and 25 ng/mL, respectively, for metoprolol. The intraday repeatability values were lower than 2.7 and 1.7% for peak area and migration time, respectively. The assay is a simple and efficient strategy with potential for application in clinical and biochemical laboratories for monitoring sotalol and metoprolol.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Yupeng Zhai,Jialin Yu,Lijuan Zhang,Yunshan Zhou,Yuxu Zhong,Ying Yang,Yong’An Wang
In this study, an α-Keggin-type polyoxometalate H 5 PV 2 Mo 10 O 40 was loaded into the adamantane cage (18 Å) of MOF-808(Ce) by an immersion method to obtain composites with different polyoxometalate loadings. The effects of the H 5 PV 2 Mo 10 O 40 loading in the composite, the reaction time, and the quantity of the composite during the decontamination of the erosive agent surrogate, 2-chloroethyl ethyl sulfide (CEES) were investigated, and the optimized catalytic conditions for CEES were determined. The decontamination rate of 4 μL CEES reached 93.91% in 120 min using 40 mg of optimized composite, and the decontamination rate of 160 μL of the nerve agent surrogate, methyl paraoxon (DMNP) reached 100% in 25 min using 5 mg of the composite. Decontamination of CEES and DMNP by the composite followed first-order reaction kinetics. The half-life ( t 1/2 ) and kinetic rate constant ( k ) of these two reactions were 27.77 min and −0.02496 min −1 and 1.895 min and −0.36569 min −1 , respectively. The composite exhibited good decontamination performance after four replicate experiments. The results showed that CEES was oxidized to CEESO, while DMNP was hydrolyzed to p -nitrophenol and dimethyl phosphonate in the presence of the composite, showing that the proposed composite is an effective bifunctional catalyst for the selective oxidation and hydrolysis of chemical warfare agent surrogates.
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Catalysts
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2020
·Vol. 10
·期 2
·207
·
IF 3.52
Hua Nie,Wei Li,Qirong Wu,Vladislav Rac,Vesna Rakić,Xuesen Du
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2was higher than that of V2O5-Ce(SO4)2/TiO2at low temperatures. V2O5-Ce(SO4)2/TiO2performed better than V2O5-WO3/TiO2when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2.
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FUEL
·
2024
·
IF 6.7
Xiao Yang,Zhuwei Yang,Linsen Li,Zhao Jiang,Guangxu Cheng
Dry methane reforming (DRM) represents a highly promising approach to greenhouse gas conversion (CO 2 and CH 4 ) to valuable byproducts. However, severe carbon deposition and catalyst deactivation inhibit large-scale applications. The work designed new catalysts with a yolk-shell structure using the water-in-oil microemulsion method. The catalysts were composed of a yolk-shell structure, with Ni-M as the active point and silica as the shell. The catalytic performance evaluation indicates that the Ni-M @SiO 2 catalysts show higher CH 4 and CO 2 conversion compared with the Ni@SiO 2 and conventional catalysts at 750 ℃, suggesting the yolk-shell structure and added M species enhance the DRM activity. The XRD, HRTEM, XPS, BET, H 2 -TPR, and CO 2 -TPD analysis confirmed the existence of yolk-shell configuration and evident electronic effect among Ni, M species, and SiO 2 . The long term measurements indicate that the added M species also bring higher carbon deposition tolerance for DRM, where Ni-Ce@SiO 2 and Ni-Zr@SiO 2 exhibit good structural and catalytic stability for DRM over 100 h. Through XRD, TEM, and TGA characterizations of the exhausted catalysts, it is determined that the coke deposition resistance of the catalyst is improved as a result of increased oxygen mobility and enhanced Ni dispersion on the catalytic surface, both of which are enhanced by the added Ce species. The structural analysis of the spent catalysts indicates that the tolerance of carbon deposition is improved by the yolk-shell samples. This study can offer valuable insights for the development of Ni-based catalysts with exceptional carbon deposition capability for DRM.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Lei Chen,Wenjie Yao,Xu Chen,Gang Yang
The Cu-Ce modified SAPO-34/ZSM-5 (S-Z) composite molecular sieve catalysts were synthesized via a stepwise crystallization process using triethylamine (TEA) and tetraethylammonium hydroxide (TEAOH) as dual templates. This method significantly reduces the crystallization time from 24 hours to 12 hours. The incorporation of metal ions alters the structure and acid strength of the molecular sieves, thereby decreasing the rate of coke formation during the reaction, which in turn extends the catalyst's lifetime. Experimental results demonstrated that the catalyst's lifetime increased progressively with the addition of Ce. In the methanol-to-olefin reaction, the catalytic lifetime of the S-Z/Cu 0.05 -Ce 0.05 samples reached 1440 mins, approximately 480 mins longer than that of the S-Z samples, while maintaining a selectivity for low-carbon olefins at around 89.6%.
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FUEL
·
2025
·
IF 7.5
Chen-Xu Chen,Jing-Pei Cao,Nai-Yu Yao,Wen Tang,Wei Jiang,Chuang Zhang,Xiao-Yan Zhao,Xiao-Yu Qiao,Tungalagtamir Bold
Improving the catalytic efficiency and catalyst life of Pt/Al 2 O 3 catalyst for methylcyclohexane dehydrogenation is of great significance for the study of organic liquid hydrogen storage. In this work, the promotion effects of Ga and Ce on the substantial improvement of catalytic stability and activity over the Pt / Al 2 O 3 during the methylcyclohexane dehydrogenation were investigated. The catalyst with optimizing Ga and Ce loading (1.5 wt%) exhibits ∼99.76 % selectivity and H 2 evolution rate of 2102 mol/g Pt /min at 300 °C. In 100 h long-time reaction, the conversion of methylcyclohexane remains around 75 % with no significant decrease. The characterization results show that introducing proper amount of Ga and Ce helps Ga 3+ cations incorporate into the lattice structure of CeO 2 that increase concentration of oxygen vacancies and CeO 2 reducibility in the catalyst, which boost the capability of methylcyclohexane dehydrogenation and tolerance for coke formation. Thus, the excellent stability and activity are achieved over the GaCe-modified catalyst. This study may share new light on the rational construction of highly efficient Pt-based catalysts for methylcyclohexane dehydrogenation.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Bingguo Liu,Yanghan Guo,Yangzi Li,Shiqing Pang,Shunzi Li,Peng Xu,Dan Zhao,Carsten Dam-Hansen,Jian Xu,Baoli Du,Ole Bjarlin Jensen
Phosphor-in-glass film (PiG-film) displays great potential for high performance laser-driven white lighting, benefiting from its facile fabrication and high efficiency. However, the low thermal conductivity of the glass matrix may lead to thermal quenching of phosphors and limit the maximum luminous flux of the light source . Here, boron nitride (BN) with high thermal conductivity and low absorption coefficient was embedded into Y 3 Al 5 O 12 :Ce PiG-film to facilitate the heat-transfer process, and to regulate the propagation of both laser and fluorescence. The influences of BN particle size and doping concentration on surface morphology (pore formation), luminescence saturation threshold (LST), luminous flux, and the spatial distribution of correlated color temperature (CCT) were investigated and correlated. Moreover, the luminescence spot confinement was analyzed and luminous exitance was obtained. Benefiting from the formation of effective BN heat-transfer network, the luminous efficacy of both YAG-45-2 % and YAG-45-1 % films surpass the non-doped one as laser power density >19.00 W/mm 2 . A LST higher than 27.04 W/mm 2 was observed in YAG-45-2 % film, more than 42 % higher than the non-doped one. Though the extra reflection of blue laser by BN particles downgrades the CCT spatial distribution uniformity, the particles strongly scatter the fluorescence and restrict the fluorescence-emitting spot (diameter) expansion from 307 to 174 μm, and a high luminous exitance of 1614 lm/mm 2 was achieved in YAG-45-2 % film. These results firmly demonstrate that incorporation of particles with high thermal conductivity and low absorption coefficient in PiG-film is a feasible strategy for achieving high-brightness laser lighting.
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