Journal of Superconductivity and Novel Magnetism
·
2024
·
IF 1.6
Pi Siwen,Li Jie,Zhang Yingde,Zhou Weina,Shan Shuo,Zhao Xuan
Ce-substituted M-type Sr 1– x Ce x Fe 12 O 19 ( x = 0.00–0.08) ferrites were successfully synthesized via the ball milling method, and the sintering temperature at 1200 °C for 2 h. The synthesized materials were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The elemental makeup of the samples was characterized by energy-dispersive spectrometry (EDS). The XRD results showed the crystal structure and purity of the samples. The FTIR spectroscopy indicated tetrahedral and octahedral tensile vibrations of M-type strontium ferrite at two characteristic peak bands of 554 and 454 cm −1 . The FESEM showed that Ce doping resulted in fine grains. The EDS indicated that Ce content increased with decreasing Sr concentration but that the concentrations of other elements remained basically unchanged. The mass ratio of Sr:Fe is calculated from EDS results and the measured Sr:Fe mass ratio is quite close to the mass ratio calculated from the reactants used to synthesize each sample. The VSM showed that at a Ce doping of x = 0.02, the coercivity of the samples reached the maximum, and the coercivity values and the saturation magnetization were 3878.25 Oe and 73.625 emu/g, respectively. And such high thermal stability further determines that Ce-substituted strontium ferrites have infinite potential in application fields (T = 450.2 °C).
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Materials Today Communications
·
2024
·
IF 3.7
Xiaoyun Shang,Xiangming Wang,Min Chen,Haoran Tu,Hongguo Zhang,Ming Yue,Xiaobo Du
To balance the utilization of rare-earth resources and reduce the preparation cost, the La and Ce substituted Nd 2 Fe 14 C hard magnetic alloys were prepared by a facile mechanochemical method for the first time. A two-step process is typically employed: 1) Decomposition of hydrocarbon and disproportionation of (Nd 1-x RE x ) 2.5 Fe 14 B 0.08 (RE=La or Ce, x=0–0.3) alloys during high-energy ball milling, Nd+Nd 2 Fe 17 +n-hexane→NdH 2+δ +α-Fe+Fe 7 C 3 ; 2) (Nd, RE) 2 Fe 14 C hard magnetic powders were obtained via the vacuum annealing at 800 °C for 2 min. The phase relation, magnetic properties and microstructural evolution of (Nd, RE) 2 Fe 14 B 0.08 C 0.92 (named Nd-RE-Fe-C-based) alloys were systematically investigated. Substitution of La for x=0.1 Nd in the Nd-RE-Fe-C-based alloy increase the coercivity from 15.6 kOe to 18.6 kOe without reducing the remanence. First-principles calculation was performed to study the mechanism of magnetic properties La and Ce substituted samples. The results showed that La tends to be expelled from 2:14:1 phase to form more minor phases which act as the domain wall pinning center, increasing the coercivity. However, Ce prefers to enter the 2:14:1 phase, diminishing the permanent magnetic properties due to the poor intrinsic magnetic properties. This paper provides a novel viewpoint for the effective utilization of high abundant rare earth and the investigation of low cost Nd 2 Fe 14 C permanent magnet materials.
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Catalysts
·
2025
·Vol. 15
·期 3
·250
·
IF 4
Jingjing Wang,Peixiang Shi,Jiahao Han,Yuhao Tian,Zhiqiang Yan,Pengcheng Luo,Hongyan Ban,Yanchun Li,Weijie Cai,Guanjing Lin,Zhiqiang Zhai,Congming Li
The hydrogenation of CO2to methanol over Cu-based catalysts is one of the attractive routes to reduce greenhouse gas emissions and generate high-value-added chemicals. Industrial CuZnAl catalysts possess some shortcomings, but various promoters can enhance the activity and durability of Cu-based catalysts for CO2hydrogenation. Herein, we systematically investigated the variations in the physicochemical properties of ternary CuZnM (M: Cr, Ce, Zr, Al) catalysts induced by different promoters, as well as their impact on CO2hydrogenation to methanol. The results demonstrate that the catalytic activity followed the order of CZCr > CZCe > CZZr > CZAl, with CZCr exhibiting the highest stability among them. Combined with XRD, SEM, TEM, H2-TPR, TPD, XPS, Raman findings and the experimental results, the smaller Cu particle size was conducive to increasing the CH3OH yield, and the lower Cu+/Cu0ratio exhibited better stability in CO2hydrogenation to methanol reaction. This approach offers theoretical insights and practical solutions for the industrial application of ternary Cu-based catalysts.
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Journal of Environmental Sciences
·
2024
·
IF 5.9
Xuan Liang,Jin Zhang,Juntai Tian,Zenghua Xie,Yue Liu,Peng Liu,Daiqi Ye
Herein, three supported catalysts, CuO/Al 2 O 3 , CeO 2 /Al 2 O 3 , and CuO-CeO 2 /Al 2 O 3 , were synthesized by the convenient impregnation method to reveal the effect of CeO 2 addition on catalytic performance and reaction mechanism for toluene oxidation. Compared with CuO/Al 2 O 3 , the T 50 and T 90 (the temperatures at 50% and 90% toluene conversion, respectively) of CuO-CeO 2 /Al 2 O 3 were reduced by 33 and 39 °C, respectively. N 2 adsorption-desorption experiment, XRD, SEM, EDS mapping, Raman, EPR, H 2 -TPR, O 2 -TPD, XPS, NH 3 -TPD, Toluene-TPD, and in-situ DRIFTS were conducted to characterize these catalysts. The excellent catalytic performance of CuO-CeO 2 /Al 2 O 3 could be attributed to its strong copper-cerium interaction and high oxygen vacancies concentration. Moreover, in-situ DRIFTS proved that CuO-CeO 2 /Al 2 O 3 promoted the conversion of toluene to benzoate and accelerated the deep degradation path of toluene. This work provided valuable insights into the development of efficient and economical catalysts for volatile organic compounds.
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高影响因子
TALANTA
·
2024
·
IF 5.6
Yi Xiao,Pengcheng Huang,Fang-Ying Wu
α-Glucosidase, which directly involves in the metabolism of starch and glycogen and causes an increase in blood sugar level, is the major target enzyme for the precaution and therapy of type II diabetes. Based on the previous work, we adopted a post-synthetic modification method to encapsulate Tb 3+ into Ce-MOF nanozyme which owned mixed valence states. Tb@Ce-MOF displayed induced luminescence characteristic and exceptional oxidase-like activity that could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue ox-TMB. α-Glucosidase can hydrolyze the substrate l -ascorbic acid-2- O -α- d -glucopyranosyl (AAG) to generate ascorbic acid (AA), which could increase the Ce 3+ /Ce 4+ redox valence mode in Tb@Ce-MOF, leading to the inhibition of the allochroic reaction of TMB and the decreased absorption of ox-TMB at 652 nm. The energy transfer (EnT) process from Ce 3+ to Tb 3+ will enhance due to the increased Ce 3+ /Ce 4+ mode in Tb@Ce-MOF, which will result in an enhanced fluorescence signal of Tb@Ce-MOF at 550 nm. But the addition of inhibitor acarbose will inhibit the above process. We have constructed a dual-mode detection platform of α-glucosidase and its inhibitor via colorimetric and fluorometric method. The linear range of α-glucosidase were 0.01–0.5 U/mL (colorimetric mode) and 0.8–1.5 U/mL (fluorometric mode), respectively, with a detection limit as low as 0.0018 U/mL. Furthermore, our approach was also successfully employed to the analysis of α-glucosidase in serum samples.
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Small
·
2025
·
IF 12.1
Jialiang Guo,Mengdie Jin,Yongkang Huang,Leilei Yin,Xiaopeng Li,Yaping Du,Xinyun Zhai
Specific regulation of the tumor microenvironment (TME) is a potential strategy for tumor therapy. Although many TME-responsive nanozymes have been developed for tumor therapy, the limited substrates affect the therapeutic effect. In this study, cerium single-atom nanozymes (Ce SAs) are prepared by immobilizing cerium (Ce) using zeolitic imidazolate framework-8 (ZIF-8) as a precursor. The reversible conversion between Ce 3+ and Ce 4+ endows Ce SAs with multiple enzyme-like activities, such as peroxidase (POD)-like activity, oxidase (OD)-like activity, catalase (CAT)-like activity, glucose oxidase (GOD)-like activity, and glutathione peroxidase (GSH-Px)-like activity. All of the above enzyme activities give Ce SAs cascade self-circulation properties and can be used for tumor therapy in the TME. In addition, the prepared Ce SAs also have photothermal properties, which can achieve photothermal therapy (PTT) of tumor cells under 808 nm near-infrared (NIR) irradiation. Combining the cascade self-cycling enzyme-like activities and the photothermal properties of Ce SAs, this synergistic therapy makes Ce SAs have attractive efficacy in tumor treatment.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qin Yao,Jian Zou,Jun Yang
The high solar reflectance and good colour performance are requisite for the practical application of the colour-cool pigment. In this work, Ce-doped Yb 3 Al 5 O 12 and (Y, Yb) 3 Al 5 O 12 ceramic pigments were prepared by the sol-gel method. Both Ce 3+ and Ce 4+ ions coexist in the doped pigments. Due to the 4f→5d electron transition of Ce 3+ , the Ce-doped pigments have a selective absorption at around 400–520 nm, which is responsible for the yellow hue. The content of the Ce 3+ ion determines the colour performance of the pigment. The size effect from the smaller Yb 3+ ion results in an increased content of Ce 3+ in the Ce-doped pigments, leading to an improved colour performance. The incorporation of Y 3+ ion can effectively decrease the absorption at 975 nm, thereby enhancing the solar reflectance to 80.6 %, while maintaining good colour performance (Yb 0.7 Y 2.1 Ce 0.2 Al 5 O 12 , L* = 91.40, a* = -4.89, b* = 45.33). In a simulation experiment, the ceramic glaze coating based on the prepared pigment showed a temperature reduction of 5.2 °C compared to the commercial yellow pigment ceramic coating .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zuozhu Yin,Qingqing Yu,Hong Chen,Xiaoxiang Chen,Kaiyuan Liu,Min Li,Xiaoze Yang,Yuhua Chen,Yu Xie,Yidan Luo,Mingshan Xue
The discharge of oily wastewater and sewage in industry and life was increasing, seriously affecting the sustainability of the environment and ecosystem. In this work, a multifunctional superhydrophobic nanocellulose-based membrane was prepared by spraying Ce-MOF nanoparticles onto the nanocellulose membrane, which had a hydrostatic contact angle of up to 170°: (i) Resistance to harsh conditions (including high temperatures, abrasion, ultraviolet light exposure, bending, and self-cleaning); (ii) Achieve efficient separation of mixed oil and water. It has shown commendable efficacy in separating wastewater containing mixed oils. The separation flux of mixed oil wastewater was 179 L·m −2 ·h −1 (n-hexane and chloroform/water), and the separation efficiency was >94 % (n-hexane and chloroform/water); (iii) Efficient and rapid photocatalytic removal of pollutants, which is a useful property to prevent organic pollution; (iv) Effectively prevent biological pollutants adhesion, reducing the amount of microbial adhesion by 67.74 %. In many fields, such as industrial production and urban sewage treatment, wastewater treatment in harsh environments as well as the durability of materials has always been an issue. The appearance of this new material provides a feasible solution to this problem.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tao Zhang,Sujie Shan,Dongqing Liu,Yu Han,Kai Sun,Wei Wang
Under the double pressure of eutrophication and phosphorus deficiency, there is an urgent need to remove excess phosphate from wastewater efficiently. Preparing cerium-based materials with excellent application potential inevitably leads to Ce(III) oxidation to Ce(IV), which reduces the phosphate adsorption effect and restricts its development. To solve this problem, we introduced a protective agent and successfully synthesised cerium-modified activated carbon sorbent containing 100 % Ce(III) during the synthesis process. Compared with CeAC without a protecting agent, CeAC-A contained more Ce(III) (100 %) and exchange groups (–OH accounted for 82.76 %), achieving an adsorption capacity of up to 448.57 mg-P/g Ce, improving of 4.3 times. At the same time, the size of the cerium active component was reduced from the micron level to the nanometer level, and the mass transfer rate was significantly improved. In addition, with the enormous specific surface area and well-developed pore structure of activated carbon, it showed high dispersibility, with P/Ce molar ratio as high as 2.03, which is 1.1–4.8 times higher than other cerium-based adsorbents. Phosphate was removed primarily through electrostatic attraction and ligand exchange. In treating municipal wastewater with complex water quality, CeAC-A showed strong selectivity, a wide range of adaptability and easy repeat regeneration, making it a promising adsorbent for phosphate uptake from wastewater.
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Forests
·
2024
·Vol. 15
·期 10
·1830
·
IF 2.4
Yong Liu,Jiake Chen,Cunxin Li,Xiangna Han,Hao Wang,Jinsong Bai,Xiaohua Liu
Block lifting is a key step in stabilizing and removing fragile remains at archaeological excavation sites. Due to its favorable working properties and adhesive effect, menthol has recently been proposed as a volatile binding medium for temporary consolidation in archaeological conservation. This paper presents a case study on the use of menthol in the extraction and restoration of a large wooden coffin lid, approximately 1.9 m long and 0.9 m wide, from tomb 11 (M11) at Xie’ertala, located east of a Xie’ertala town in Hailar City, Inner Mongolia, dating to the 7th to 10th centuries CE. This coffin lid had fragmented into numerous wooden pieces, and was preserved in a relatively arid steppe environment, necessitating the extraction of the lid as a consolidated block. The use of menthol for consolidating and lifting the highly fragmented wooden coffin lid was intended to preserve critical archaeological information while avoiding damage to the underlying objects. An analysis of the physicochemical properties of these wooden remains suggests that the timber used for the coffin lid belongs to a common pine species from the Hulunbuir region. The degradation of the coffin lid was relatively mild, as shown by Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscope (SEM) results. Dynamic Vapor Sorption (DVS) tests indicated that the hygroscopicity of the archaeological wood was 23.4%, compared to 21.1% for the reference sample, demonstrating good environmental stability. The safety of menthol as a treatment for fragile wooden remains was evaluated by comparing changes in the morphological and porosity characteristics of the coffin lid before and after menthol treatment. After treatment, the widths of the fissures remained largely unchanged, with all relative variations being less than 1%, and the porosity as well as pore size distribution of the wood showed negligible changes. Gas Chromatography–Mass Spectrometry (GC-MS) results showed that only 0.6% of menthol residue remained after 8 days of sublimation. This pilot study demonstrates that menthol is a safe temporary consolidant for block lifting and offers a promising alternative to the widely used cyclododecane. In conclusion, this research provided a new approach for conservators to safely lift similarly large and fragile wood remains during archaeological excavations.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Qian Liu,Li Zhang,Yucheng Liu,Xiaoqiang Zheng,Xuna Liu,Zhongquan Zhong,Liping Wei,Qianqian Zhao,Tingting Yao,Ping Yang
With appropriate cerium (Ce) doping, the layered lithium ion-sieve precursor Li 1.37 Ce 0.001 Mn 1.22 O 3 was synthesized using hydrothermal and solid-phase calcination, which exhibited Li/Mn ratio exceeding 1, indicating a high theoretical adsorption capacity. The incorporation of Ce further stabilized the spatial configuration of the layered ion-sieve and controlled the dissolution loss ratio of manganese (Mn) to approximately 0.55%. At 25 °C, with pH of 9 and initial lithium-containing solution concentration of 100 mg/L, the adsorption capacity can reach around 33 mg/g. Despite the presence of interfering ions, it maintained selective adsorption of lithium (Li). The lithium adsorption process by layered lithium ion-sieve adhered to the Langmuir adsorption isotherm model, while the kinetics of adsorption conformed to pseudo-second-order kinetics. This adsorption process was characterized as spontaneous and endothermic, with higher temperatures and concentrations of lithium solutions facilitating both the adsorption process and capacity. It was found that in simulation analysis, compared to the cubic ion-sieve precursor, Li in the layered structure occupied more spatial points, resulting in a more compact stacking and increased bond energy. It alleviated the dissolution loss of Mn during the pickling process. The proximity of Ce resulted in a reduction of the charge on Mn and Li. An appropriate amount of Ce doping will enhance the valence state of Mn; however, excessive Ce doping led to the depletion of electrons from nearby Mn and Li. During pickling process, the Li surrounding Ce in the precursor were preferentially replaced by hydrogen (H) due to their lower charge.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenyue Jiang,Bingxin Zhao,Ziting Li,Peng Zhou,Yuxin Zhao,Xiaoshuang Chen,Jinping Wang,Rui Yang,Chunling Zuo
The investigation of cost-effective and highly efficient electrocatalysts for alkaline water and simulative seawater oxidation is essential to the conversion and storage of renewable energy . In this paper, the Ce–NiSe 2 /CoP catalyst with multihole and ultrathin nanosheet structure is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets contribute the excellent OER performance under different alkaline 1 M KOH and simulated seawater (1 M KOH + 0.5 M NaCl) electrolytes. Specifically, this catalyst exhucture is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets conibits the low overpotentials of 287 and 304 mV at the current density of 10 mA cm −2 , along with the Tafel slopes of 87.1 and 78.8 mV dec −1 in two solutions, respectively. Moreover, the Ce–NiSe 2 /CoP target product also displays good stability. The present study introduces a promising strategy for the advancement of high-performance electrocatalysts in green energy field.
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