Processes
·
2025
·Vol. 13
·期 10
·3203
·
IF 2.8
Kaster Kamunur,Olesya Tyumentseva,Lyazzat Mussapyrova,Aisulu Batkal,Ardak Karagulanova,Rashid Nadirov
Coal ash represents an abundant secondary resource of rare earth elements (REEs), but their recovery is hindered by low concentrations in leachates and the presence of large amounts of competing matrix elements such as Fe, Al, Ca, and Mg. In this study, a stepwise pH-controlled precipitation approach was applied to real sulfuric acid coal ash leachates for selective recovery of Ce and La. The process combined impurity scrubbing, oxidative precipitation of Ce, and phosphate precipitation of La. Nearly complete recovery was achieved, with >95% of both Ce and La recovered and >99% phase purity. Selectivity analysis further demonstrated strong discrimination of REEs over matrix elements, with Ce showing >400 selectivity over Fe, Al, and Ca, and La showing ~170 over the same ions and ~17 over Ce. These results show the efficiency of the approach under realistic multi-element conditions.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Feng Jiao,Jinzhao Huang,Zehui Liu,Yu Zhang,Xiaolong Deng,Ke Zhang,Guixin Zhao
In this paper, sodium sulfite (Na₂SO₃) and cerium nitrate (Ce(NO₃)₃) were added in the hydrothermal method for the preparation of FeCo LDH, and needle-like Ce-FeCo LDH (NS) catalysts were grown in situ on a carbon cloth.The additions of Na₂SO₃ and Ce(NO₃)₃ regulated the electron transfer of the metal cations in the LDH, and significantly improved the performance of the catalysts. The prepared Ce-FeCo LDH (NS) catalysts exhibited excellent electrochemical properties. The overpotential of OER was 221 mV at a current density of 10 mA/cm² in 1 M KOH. The surface structure and catalytic performance of the catalysts were maintained well after 100 h stability test. This study provides a new idea for the improvement and design of OER catalysts based on FeCo LDH, which is an important reference for clean energy research.
研究领域:
材料科学
·
清洁能源研究
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2025
·
IF 4.9
Xu Dan,Qin Yuanyuan,Huang Yuhua,Wang Jiaming,Liu Xiao,Liu Feiyan,Li Xiancai,Cao Xiaohua
The enrichment and recovery of rare earth ions is an effective way to achieve sustainable utilization of wastewater resources. Using a simple ultrasound assisted synthesis method, nano hydroxyapatite (HAP) was introduced into ZIF-67 at room temperature to synthesize HAP/ZIF-67 composite materials with rich functional groups. XRD, FT-IR, SEM, XPS, and BET were used to characterize HAP/ZIF-67 composite materials. The effects of pH, contact time, adsorbent dose, ambient temperature, and initial concentration on the adsorbent were investigated through static adsorption experiments with repeated cycles. The results show that the synergistic effect of the Co–OH, –NH–, –C=N– functional groups in ZIF-67 and the Ca–OH and PO 4 3− groups in nano-HAP improves the adsorption capacity of the composite material. Under the optimal conditions, HAP/ZIF-67 reached saturation of Ce(III) adsorption within 20 min with a maximum adsorption capacity of 461.55 mg/g and an adsorption rate of 92.31%. The adsorption characteristic of Ce 3+ on HAP/ZIF-67 composites is more consistent with the Langmuir isotherm model and pseudo-second-order model, which indicate a single-layer, surface-homogeneous chemisorption process for Ce(III) adsorption. The adsorption process is a spontaneous heat absorption process according to thermodynamic research. The main mechanism of HAP/ZIF-67 adsorption of Ce(III) is surface complexation. After four elution experiments, HAP/ZIF-67 adsorbent has good reusability, indicating that HAP/ZIF-67 is a promising adsorbent in the field of rare earth ion recovery.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 8
·2270-2279
·
IF 3.186
Bie Xuan,Jiao Kunling,Gong Chunqin,Qu Baozhong,Liu Daokuan,Ma Shuangchen
To develop highly efficient NH 3 -SCR catalysts with a wide temperature range, catalysts based on MnAlO x and Cerium elements loading with various mixing ratios were prepared for selective catalytic reduction of NO by NH 3 . The special role of cerium was demonstrated by the surface structure characteristics and unique catalytic performance, involving the surface-active sites and compositions analysis. Interestingly, the strengthening of Mn 1.2 Al 0.8 Ce a O x on both acid sites, especially medium acids and strong acids, were clearly manifested. Meanwhile, the strong interaction between MnAlOx and CeO 2 enabled favorable electron transfers from MnOx to CeO 2 while generating more oxygen vacancies and active oxygen species, consequently accelerating the redox cycle. The results illustrate that the NOx conversion and the selectivity of N 2 can be improved with more medium acids tuned by appropriate Ce adding. However, an opposite effect will appear by excessive addition. In addition, the reaction mechanisms at different acid sites are revealed. Our findings, therefore, provide a strategy for the rational design of moderate-temperature NH 3 -SCR catalysts through adding-induced component engineering of composite materials. Graphic Abstract Mn 1.2 Al 0.8 Ce a O x Catalysts with different surface features were fabricated by an environment-friendly method. The strong interaction between MnAlOx and CeO 2 was systematically illustrated. Meanwhile, the importance of medium acids was convincingly revealed. And the reaction mechanisms at different acid sites were demonstrated. These provide a strategy for the rational design of moderate-temperature NH 3 -SCR catalysts through adding-induced component engineering of composite materials.
研究领域:
催化化学
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环境科学
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材料科学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Yan Ge,Caiyi Fan,Qiyue Zhang,Hui Yang,Saisai Yuan,Bin Xu
In situ synthesis of S-scheme COF/Ce-MOF heterojunctions significantly enhances photocatalytic H 2 O 2 production under ambient conditions. The directional charge separation, precise band alignment, and synergistic dual active sites of the heterojunction enable efficient, stable, and selective H 2 O 2 generation. The CRM (Ce-MOF/COF) heterojunction delivers an H 2 O 2 yield that is 11.2-fold higher than pristine Ce-MOF and 3.1-fold higher than pure COF. Moreover, the CRM heterojunction maintains excellent productivity over a 6-h reaction period. In situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) analyses revealed not only the elemental composition and chemical states at the heterojunction interface but also the interfacial electronic redistribution and band alignment responsible for the enhanced photocatalytic performance. Specifically, the combined experimental and theoretical results confirmed the presence of strong interfacial coupling, the formation of an internal electric field, and the establishment of an S-scheme charge transfer pathway, all of which contribute to efficient charge separation and the preservation of high redox potentials, thereby enabling superior H 2 O 2 generation activity. Overall, this work not only deepens the understanding of MOF-based photocatalysts but also provides valuable design principles for constructing next-generation heterojunction materials with superior efficiency in photocatalytic H 2 O 2 production for environmental remediation.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yong Zhang,Yutao Zhang,Caihong Wu,Yiting Yang,Qiang Li,Yongnan Chen
To improve the high-temperature oxidation resistance and electrical conductivity of ferritic stainless steels , protective Ce-doped NiMn 2 O 4 spinel coatings were fabricated on the surface of SUS430 steel by electrophoretic deposition (EPD). The phase structure and microstructure of Ce-doped NiMn 2 O 4 in both powder and coating forms were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The high-temperature oxidation of the NiMn 2 O 4 spinel coating before and after Ce doping in the air at 800 °C for 168 h was studied by weight gain experiments. The area-specific resistance (ASR) of coatings was measured by a standard four-probe method. It was found that the Ce-doped NiMn 2 O 4 spinel powder displayed a stable structure, high crystallinity, fine grain size, and decreased agglomeration when the Ce content was fixed at 0.05 mol∙L −1 . The oxidation kinetics of NiMn 2 O 4 -coated SUS430 steel before and after Ce doping obeyed a parabolic law with parabolic rate constants of 4.58 × 10 −15 g 2 cm −4 s −1 and 1.83 × 10 −15 g 2 cm −4 s −1 , respectively. When oxidized at 800 °C for 50 h, the ASR value of the coated samples before and after Ce doping stabilized at about 15.2 mΩ∙cm 2 and 14.5 mΩ∙cm 2 , respectively. This work demonstrated that the Ce-doped NiMn 2 O 4 spinel coating improved the high-temperature oxidation resistance and the electrical conductivity of metal interconnects.
研究领域:
材料科学
·
表面工程
·
高温材料
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Yanbin Wang,Ziqiu Cheng,Junhao Ye,Chen Hu,Zhenzhen Zhou,Yuyang Chen,Haohong Chen,Denis Yu Kosyanov,Jiang Li
Compared to phosphor and phosphor in glass, phosphor ceramics have higher thermal properties , and are less prone to thermal quenching. (Ce,Lu) 3 Al 5 O 12 (Ce:LuAG) has better thermal stability than most of the phosphors, such as (Ce,Y) 3 Al 5 O 12 (Ce:YAG). However, the high melting point of Lu 3 Al 5 O 12 (LuAG; up to 2010 °C) presents a great challenge in producing transparent ceramics (TCs), so a series of Ce:LuAG nanopowders with high sintering activity were prepared by the co-precipitation method and then used as initial materials to obtain x at.% Ce:LuAG ( x = 0.05, 0.1, 0.2, 0.3, 0.35, 0.4, 0.5, 0.55, 0.6, 0.65, 0.7) TCs by vacuum sintering at 1775 °C for 10 h. Moreover, the luminous properties of typical Ce-doped LuAG phosphors were systematically investigated using excitation by light-emitting diodes or laser diodes (LEDs/LDs). The emission intensity of 0.4 at.% Ce doped sample is the highest among all TCs with Ce amount ranging from 0.05 to 0.7 at.% at room temperature. The photoluminescence intensity of 0.4 at.% Ce:LuAG only decreases by 12.5% from 25 to 225 °C. The 0.4 at.% Ce:LuAG based on 0.8 W LEDs and 1.1 W LDs has the optimum luminous flux of 71.5 and 113.7 lm and the luminous efficiency of 89.3 and 101.4 lm∙W −1 , respectively. As Ce concentration increases, a decrease in the luminescence saturation threshold of TCs is observed with a blue laser power density of 2.5–36.9 W∙mm −2 . A high-flux yellow-green light of 1166.9 lm is obtained from 0.1 at.% Ce:LuAG when excited with a high-power LD with an energy density of 36.9 W∙mm −2 . This work explored the best Ce doping level in Ce:LuAG TCs, as well as the luminescence saturation threshold in remote laser lighting applications.
研究领域:
材料科学
·
光学工程
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jun Cai,Yuanhang Ren,Yi Xia,Lei Tao,Xueqian Wang,Langlang Wang,Ping Ning,Yixing Ma
A cubic SrTiO 3 (STO) composite material co-doped with Ce and Cr ions was synthesized by solvothermal method . The fully characterized samples were employed as photocatalysts for the oxidation of Hg 0 . The co-doped samples afforded excellent catalytic removal efficiency of 98.99% using UV irradiation and 89.9% using visible light irradiation for Hg 0 compared with the single-doped samples. It was found that co-doped samples had a lower electron-hole recombination rate, largest Brunauer-Emmett-Teller specific surface area , and reduced band gap. The electron spin resonance results revealed that ·O 2 − and ·OH were the main active species in the catalytic process. Moreover, the co-doped samples exhibited the best electron transfer rate and the highest photocurrent response intensity. The electron transfer between the elements in the co-doped sample enables it to achieve stable and efficient catalytic performance. In addition, even after five consecutive catalytic runs, the co-doped sample maintained high catalytic activity . This work highlights the potential of the perovskite-type STO materials in the photocatalytic oxidation of gaseous mercury.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhanghao Cheng,Siyao Li,Xingying Wu,Yichi Zhang,Chenyu Wang,Yuezhen Mao,Chunwen Sun
As one of the most widely used composite electrolyte matrices, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) offers many advantages, such as excellent mechanical flexibility and a high dielectric constant. However, its inadequate mechanical strength leads to a limited ability to inhibit the growth of lithium dendrites, thus restricting its performance in solid-state lithium metal batteries. The key to overcoming this bottleneck lies in incorporating fillers to simultaneously improve the ionic conductivity and mechanical robustness of the electrolyte. In this work, lithium niobate (LiNbO3) and Ce-doped lithium niobate (LiNb0.9Ce0.1O3) nanofibers were employed as fillers in the PVDF-HFP-based electrolyte to promote the dissociation of lithium salts, thereby establishing a microenvironment conducive to efficient lithium-ion transport. The results demonstrate that when LiNb0.9Ce0.1O3 nanofibers are incorporated as electrolyte fillers, the dissociation of lithium salt is enhanced, thereby improving the ionic conductivity and Li+ transference number of the composite electrolyte. Furthermore, the composite solid electrolyte incorporated with LiNb0.9Ce0.1O3 nanofibers (LNCO CSE) exhibited an exceptional dendrite suppression capability, enabling lithium symmetric cells to operate stably at 0.1 mA cm–2 for over 1100 h. The Li||LNCO CSE||LiFePO4 full cells demonstrated outstanding rate performance and long-term cycling stability, delivering a reversible specific capacity of 136.9 mAh g–1 after 600 cycles at 1C. Furthermore, the Li||LNCO CSE||LiNi0.8Co0.1Mn0.1O2 full cell also exhibited excellent rate capability, and its capacity retention rate reaches as high as 74.1% after 500 cycles at 0.5 C.
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PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6
Xiangwei Ren,Yue Zhang,Shuzhen Lyu,Li Wang,Ruichen Liu,Guozhu Liu,Rongrong Zhang
Oxidation of methylene compounds remains a critical challenge due to the difficult activation of C–H bond. Herein, Ce–Al composite oxide was prepared and employed for oxidation of 2-alkyl-anthrone and anthracene to corresponding anthraquinone (AQ) which is used widely in the H 2 O 2 production by the anthraquinone process and fine chemical industries, with air at mild conditions. Characterization results show that incorporation of Ce, existing partially in CeAlO 3 phase, results in the generation of oxygen vacancies and enhancement of reducibility. The optimal Ce–Al composite oxide (10%CeAl) exhibits superior performance in oxidation of 2-alkyl-anthrone and anthracene to AQ. The conversion of 100% could be achieved for 2-alkyl-anthrone to AQ at reaction time of 8 h and for 2-alkyl-anthracene to AQ at 15 h over 10%CeAl, with 100% selectivity. In-situ electron paramagnetic resonance measurements and DFT calculations reveal that the Ce–O–Al structure in CeAlO 3 phase promotes the formation of carbon-centered radical R • through altering the C–H cleavage mechanism from hydrogen atom transfer to proton-coupled electron transfer (PCET), and superoxide anion radicals (O 2 •− ) formed on oxygen vacancies promote oxidation of R • .
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junli Liu,Wenxia Cheng,Kaitao Zhang,Hui Liu
Bacterial infections is a serious threat to our health. Thus, there is an urgent need to develop a new effective antibacterial agent. In this work, we developed a novel and environmentally friendly Ce–MoS 2 /WO 3 nanocomposite antimicrobial agent with excellent antimicrobial effect and the antimicrobial efficiency against E. coli reached to 97.8% under visible light irradiation. Electron paramagnetic resonance (EPR) spectra showed that the large amounts of superoxide anion radical (•O 2 − ) and hydroxyl radical (•OH) were generated by the nanocomposites under light excitation, which were the main active substances causing oxidative damage for bacteria. Simultaneously, the photothermal curve and peroxidase activity test of Ce–MoS 2 /WO 3 nanocomposites confirmed it has the excellent photothermal effect and enhanced enzyme-like activity, which further assisted in antibacterial effects. Ce doping enlarges the layer spacing of MoS 2 and forms lattice dislocations and distortions, effectively increasing the defect sites at the layer edges, and the coupling of Ce–MoS 2 and WO 3 to construct heterojunctions reduces the charge separation rate, which further improves the photocatalytic antibacterial performance and enzyme-like antibacterial activity of Ce–MoS 2 /WO 3 nanocomposites.
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Frontiers in Environmental Science
·
2022
·
IF 5.411
Wang Qinghong,Ji Yuanyuan,Hu Jingze,Ye Huangfan,Liu Ya,Wang Yuxian,Chen Chunmao,Li Zhuoyu
Cerium oxides loaded silica catalysts were synthesized by an impregnation method by simply mixing Ce precursor with silica spherule (Ce/SS) and ordered MCM-41 zeolites (Ce/MCM-41), followed by a mild calcination. Compared with pure SS and MCM-41, Ce modified Ce/SS and Ce/MCM-41 demonstrate much improved catalytic ozonation activities for mineralization of recalcitrant nitrobenzene (NB). At solution pH of 6, 86 and 97% TOC mineralization rates were achieved within 60 min for Ce/MCM-41 and Ce/SS, respectively. Characterization results suggest that Ce loading significantly increases the surface Lewis acidic sites, which would synergize with Ce3+/Ce4+ redox cycle for the activity improvement. With the aid of in situ electron paramagnetic resonance (EPR) spectra and quenching tests, hydroxyl radical (·OH), superoxide radical (O2•–), and singlet oxygen (1O2) are identified as the O3 catalytic decomposition products, while ·OH mainly accounts for NB mineralization. The detailed degradation route of NB was further investigated by the multi-chromatography analysis. NB is firstly oxidized into polyhydroxy compounds, followed by small molecular organic acids, and finally being mineralized into CO2 and H2O. This study established a facile strategy to synthesize highly active and stable Ce/SiO2 catalysts for catalytic ozonation, and elucidated the in-depth mechanisms for the activity origins of the Ce loaded silica-based materials in catalytic ozonation processes (COP).
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