CHEMISTRY & BIODIVERSITY
·
2023
·Vol. 20
·期 3
·e202200813
·
IF 2.9
Kaiwen Li,Jie Wang,Zizhen Huang,Chunxia Tan
Angelica Sinensis polysaccharide cerium (ASP−Ce) was prepared by Angelica Sinensis polysaccharide (ASP) and cerium ammonium nitrate (NH 4 ) 2 Ce(NO 3 ) 6 . and its morphology, and solid structure was investigated. The antioxidant activity of the ASP−Ce complex in vitro was evaluated. The antioxidant activity of ASP−Ce complex in vitro was evaluated by the scavenging activity of 2,2-diphenyl-1-picrylhyrazyl radical (DPPH), hydroxyl radical (⋅OH) and superoxide anion radical ( ⋅). The results showed that the ASP−Ce had the more ordered structure for inserting the Ce 4+ into the polymer chain of ASP and there was little change in the conformation of the polysaccharide from Ce 4+ . Three free radical scavenging experiments proved that ASP−Ce had better antioxidant capacity than of ASP, especially on DPPH, and then on ⋅. The scavenging rate of ASP−Ce at 1.0 mg/mL on DPPH reached 71.6 %. Therefore, these results provide references for the further development and utilization of rare earth-polysaccharide.
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高影响因子
Processes
·
2022
·Vol. 10
·期 12
·2562
·
IF 3.352
Yuxi Gao,Baofang Jin,Xiaodong Wu,Zhenguo Li,Rui Ran,Duan Weng
Two Mn0.15Ce0.85O2−δmixed oxides were synthesized by a co-precipitation method using Mn(NO3)2and KMnO4as the manganese precursors, respectively. Structural analyses by X-ray powder diffraction and Raman spectroscopy reveal the formation of MnOx-CeO2solid solutions. The Mn0.15Ce0.85O2−δcatalyst prepared from the high-valent manganese precursor exhibits higher activity for the catalytic oxidation of NO. The advantage of KMnO4is related to the improved redox property of the catalyst as supported by H2temperature-programmed reduction (TPR) and O2temperature-programmed desorption (TPD). The Mn-Ce interactions create more Mn4+, Ce3+and oxygen vacancies on the KMnO4-synthesized mixed oxides based on the Raman and X-ray photoelectron spectra (XPS).Keywords:solid solutions;precursor;oxidation state;lattice defects;NO oxidation
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FUEL
·
2022
·
IF 8.035
Caixia Zhu,Kaizhuang Xu,Yuan Fang,Qian Lv,Kun Jiang,Huibo Zhao,Yang Chen,Peng Wang,Hua Yang,Lizhi Wu,Yu Tang,Li Tan
The direct synthesis of ethanol from syngas is a promising way in the field of clean and efficient use of fossil fuel, but it still suffers from insufficient ethanol selectivity and understanding of active sites. In this work, the Rh-based catalyst with Ce as promoter and ZrO 2 as carrier exhibits excellent catalytic performance, showing the selectivity of ethanol toward 24.3 %. Moreover, the yield of methane decreases to 4.8 %, and the formation of CO 2 is inhibited to a certain degree by tuning the active sites. The carrier is changed by doping Ce into the ZrO 2 lattice, which assists to form the Rh δ+ active sites. The synergetic effect of Ce and Zr is important to influence the state of Rh species in the catalysts, leading to the differences in the CO hydrogenation process. On the other hand, the Rh δ+ active sites are also stabilized by promoted surface oxygen vacancies in the 2.0Rh5.0Ce-ZrO 2 catalyst. The high-activity catalyst with Rh δ+ active sites will be helpful to understand the real active sites of Rh-based catalysts for ethanol synthesis from syngas, thereby guiding further design of the related catalyst with high performance to meet the industrial demand in syngas converting to ethanol.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qian Wang,Can He,Yue Shan,Zhongguo Zhang,Jiuyi Li
The aim of this study is to investigate the degradation efficiency and mechanism of atenolol (ATL) by catalytic ozonation with Al 2 O 3 supported manganese-cerium mixed oxides (Mn-Ce@Al 2 O 3 ), prepared by the impregnation-calcination method. The Mn-Ce@Al 2 O 3 with 0.2 wt% manganese and 0.2 wt% cerium exhibited superior catalytic performance, resulting in complete ATL degradation and 63% mineralization. Mn-Ce solid solution on the surface significantly increased the specific surface area (279.5 m 2 /g). High amount of Ce 3+ , Mn 3+ and high density of surface-active oxygen were contained on the surface of the catalyst, which facilitates the formation of oxygen vacancies and promotes the electron transfer in the catalyst. Combined with the low charge transfer resistance, surface protonated hydroxyl group, which was the active site of 0.2Mn-Ce@Al 2 O 3 , was more likely to adsorb ozone and decompose it into reactive oxygen species . O 2 · − and •OH were found to be the dominant active radicals for ATL degradation and mineralization that followed first-order kinetics. 17 intermediates were identified and 3 main degradation pathways were summarized, in order to provide reference for the complete mineralization of ATL.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 1
·56-63
·
IF 2.172
Jie Zhang,Ben Dong,Jing Liu,Wuxu Yang,Sijie Ge,Shilong He
In this article, Mn doping on Ce-based γ-Al2O3 (i.e., Mn-Ce-γ-Al2O3) was synthesized and then employed as catalysts to study the removal of phenol from aqueous solutions through catalytic ozonation process. The results showed that the phenol removal was remarkably increased to 97.50% if Mn-Ce-γ-Al2O3 was adopted as the catalyst. In addition, the kinetic rate of the reaction was increased, approximately, about 1.49 times when using Ce-γ-Al2O3 catalyst with Mn doping. Moreover, X-ray diffraction, transmission electron microscopy, Brunner-Emmet-Teller measurements, and X-ray photoelectron spectroscopy techniques were used to comprehensively characterize the physicochemical properties of the synthesized Mn-Ce-γ-Al2O3 catalyst, including the phases, morphologies, textural properties, and dispersity of the surface active species. More uniform channel mesoporous structures were obtained after Mn doping on Ce-γ-Al2O3, which could enhance the gas-liquid mass transfer rate, surface hydroxyl groups, Ce3+/Ce4+ ratio, and the formation of Mn-Ce solid solution. In this study, the effects of Mn doping on Ce-based γ-Al2O3 on phenol degradation were investigated and the removal mechanisms were suggested for a better understanding of the improved removal efficiency.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 7
·4974-4985
·
IF 4.186
Hang Liu,Xiaofeng Zhao,Yuancheng Teng,Yuxiang Li,Xiayu Zheng,Shanlin Wang,Lang Wu,Pritam Kumar Panda,Rajeev Ahuja
LnPO 4 · 0.667H 2 O rhabdophane has been considered as a potential material for the precipitation of actinides from radioactive waste liquid, owing to its outstanding characteristics of high actinide bearing and easy synthesis in acid solutions. However, a comprehensive understanding of the actinide occupation and the precipitation response of rhabdophane to remove actinides has yet to be established. In this study, the effect of ions concentration and pH values on the detailed precipitation reaction of Ce x Nd 1- x PO 4 · 0.667H 2 O rhabdophane in acid solutions are systematically investigated. Some specific issues such as structural distortion and flexibility, and occupation mechanism are discussed by combining with experiments and density functional theory (DFT) calculation. The results reveal that ions concentration and pH values have a significant impact on the crystallization nucleation step before 12 h. The obtained removal rate of Nd 3+ is more than 99% in pH 1–5 solutions with the ions concentration of 0.05–0.1 mol/L. Moreover, incorporating Nd in CePO 4 · 0.667H 2 O rhabdophane will easily result in the lattice distortion in b -axis. DFT calculation and X-ray photoelectron spectroscopy (XPS) results reveal that Nd is preferentially incorporated in nonhydrated site to form a weaker binding energy of NdO 8 polyhedron.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 104
·期 2
·380-386
·
IF 2.606
Yang Xiaobing,Pan Junjie,Fang Ming,Su Taichao,Cheng Kejun
Photocatalysis, as one of the most advanced oxidation techniques, has been paid more and more attention due to its advantages in solving environmental pollution problems, such as low cost, eco-friendly, efficiently and no secondary pollution. In this paper, we fabricated a series of Ce doped CoIn 2 S 4 photocatalyst with different Ce content via solvothermal reaction and explored the influence of Ce on the photocatalytic activity of CoIn 2 S 4 . The properties of all samples were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), ultraviolet spectrophotometer (UV–vis), transmission electron microscope (TEM) and so on. The results show that the doping of Ce can highly improve the photocatalytic activity of CoIn 2 S 4 . When CoIn 2 S 4 is doped with 0.1 g of Ce(NO 3 ) 3 ·6H 2 O, it exhibits the highest photocatalytic activity and can degrade 98.55% of rhodamine B (RhB). This strategy of doping rare earth element on semiconductor provides a facile and promising way to the remediation of environmental pollution.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 6
·596
·
IF 4.501
Silun Zhu,Shuying Shi,Xinhua Zheng,Xinqiang Wang,Gang Yu,Yonggang Jiang,Jian Feng,Luyi Zhu,Guanghui Zhang
In this paper, cerium was incorporated into polyhydroxyltriacetictin (PHTES) using the sol-gel method combined with electrospinning technology to prepare a series of composite oxide fiber catalysts SnxCe1−xO2in different proportions. The structures and soot catalytic activities of SnxCe1−xO2fibers were studied under loose contact conditions. When Ce entered the crystal lattice of SnO2, the structural symmetry of the SnO2was destroyed, which inhibited the crystallization and grain growth of the fiber, and fiber catalysts with a larger specific surface area were obtained. Moreover, the introduction of Ce improved the number of oxygen vacancies and redox ability of the catalyst, thus promoting the catalytic activity of the catalyst for soot particles. In particular, among them, the Sn0.7Ce0.3O2fiber catalysts had the strongest catalytic oxidation ability regarding soot particles and could oxidize soot particles at a lower temperature and faster catalytic rate. The results of the temperature-programmed oxidation of Sn0.7Ce0.3O2fiber catalyst, conducted three times under the same conditions, were basically consistent, indicating that the experimental results are reliable and repeatable. In addition, the Sn0.7Ce0.3O2fiber catalyst showed good cycle stability.Keywords:electrospinning;SnxCe1−xO2fiber catalyst;soot combustion
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Nanoscale
·
2022
·Vol. 14
·期 39
·14471-14481
·
IF 8.307
Danyang Li,Enna Ha,Jingge Zhang,Luyang Wang,Junqing Hu
Near-infrared light-induced catalysts are considered to be potential nanoagents for tumor therapy. Cerium (Ce) is a non-biotoxic lanthanide element and exhibits variable valence states for catalytic reactions. In this work, we report a one-step hydrothermal synthesis for Ce-doped MoOx (CMO) nanomaterials. The obtained CMO nanomaterials show high absorption in the NIR II regime and a high photothermal conversion efficiency of 67.7% (1064 nm). Moreover, due to the doping of Ce element, the consumption of hydrogen peroxide (H2O2) and glutathione (GSH) is boosted which enhances the chemodynamic and photodynamic therapy simultaneously. Under NIR II laser irradiation, the designed CMO nanocatalysts induce metabolism disruption and mitochondrial damage in the tumor cells. As-prepared CMO nanomaterials also show good biocompatibility and pH-responsive degradation behavior, which can be degraded rapidly under alkaline conditions (pH = 7.4) and remain stable in acidic solution (pH = 5.6). These properties make CMO nanomaterials ideal biodegradable nanotheranostic agents for synergistic chemodynamic–photodynamic–photothermal antitumor therapy.
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高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Shuzhen Cui,Faqiang Wang,Kanjun Sun,Xin Wang,Qinzheng Hu,Hui Peng,Guofu Ma,Ziqiang Lei
Doping metal ions into metal compounds is an effective strategy to improve ionic and electronic conductivity and electrochemical properties of metal compounds. Herein, we demonstrate the design and fabrication of novel Ce-doped NiMoO4 nanosheets by a simple hydrothermal method without adding any surfactants and templates toward achieving high-specific energy aqueous hybrid supercapacitors. The doping of Ce ions into the sheet structure of the NiMoO4 material can expand the tunnel structure of the crystal and enhance the electronic conductivity of the nanomaterials, thus providing the electrode material with a large ion storage space and easy ion diffusion channels. The Ce-doped NiMoO4 nanosheet shows a high specific capacity of 107 mA h g–1 at 1 A g–1, which is higher than that of the bare NiMoO4 nanosheet. In addition, a novel hybrid supercapacitor (HSC) is fabricated by using Ce-doped NiMoO4 nanosheets as the positive electrode and Fe3O4@Bi2O3 nanoarrays as the negative electrode, with aqueous KOH as the electrolyte. The Ce-doped NiMoO4//Fe3O4@Bi2O3 HSC has a high output voltage (1.65 V) and a high energy density of 32.8 W h kg–1 at a power density of 415 W kg–1 as well as good electrochemical stability. The results show that Ce-doped NiMoO4 nanosheets can be used as an advanced electrode for supercapacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 32
·43815-43830
·
IF 4.223
Liu Yaxin,Ma Yongwen,Wan Jinquan,Wang Yan,Sun Jian,Xue Yangyang
In this work, Co-Ce-Zr/γ-Al 2 O3 3 particle electrodes were prepared for the efficient degradation of ciprofloxacin (CIP). Co-Ce-Zr/γ-Al 2 O 3 particle electrodes were analyzed with a scanning electron microscope (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence Spectrometer (XRF), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). According to the results, significant amounts of Co 3 O 4 , CeO 2 , and ZrO 2 were formed on the Co-Ce-Zr/γ-Al 2 O 3 particle electrodes. It was shown that when the conditions of the reaction system were at pH=6, conductivity of 4 ms/cm, current of 0.2 A, initial pollutant concentration of 100 mg/L, and material dosage of 15 g, CIP could be completely degraded within 40 min, and the energy consumed in the reaction was 41.3 kWh/kg CIP. The rate of total organic carbon (TOC) removal by Co-Ce-Zr/γ-Al 2 O 3 particle electrodes was recorded to be approximately 52.6%. Using a response surface methodology, we explored the optimal operating conditions. At the same time, we also explored the influence of inorganic anions in water and actual water medium on the rate of CIP removal. In addition, the ESR data proved that the main active substance in the reaction system was ·OH. The degradation intermediates were investigated, and the possible mechanism was proposed. Thus, this research provided a new solution for the treatment of antibiotic-containing wastewater.
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Biosensors-Basel
·
2021
·Vol. 11
·期 7
·204
·
IF 5.519
Yanyan Cheng,Ling Liang,Fanggui Ye,Shulin Zhao
Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, theKm(H2O2and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.Keywords:nanozyme;Ce-MOF;haloperoxidase-like activity;ratiometric colorimetric;hydrogen peroxide
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