JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jingyu Ren,Jie Li,Lei Lv,Jian Wang
Herein, Ce doped CoOOH was used as the catalyst for caffeic acid (CA) degradation by dielectric barrier discharge (DBD) plasma. The treatment performance and catalytic mechanism were studied by a series of experiments and density functional theory (DFT) simulations. The results show that the doping amounts of Ce significantly influenced the catalytic performance of CoOOH in DBD plasma, and the catalytic effect reached maximum when the molar ratio of Ce to Co was 1:9. CA was 100 % degraded by Ce 1 /Co 9 OOH/DBD with 10 min treatment, while only 75.6 % of CA was degraded by 10 min DBD treatment. Transformation of O 3 and H 2 O 2 to ⋅OH was mainly responsible for the catalytic effect. The content of oxygen vacancies and unsaturated Co (Lewis acid sites) of CoOOH was increased by doping Ce according to the results of experiments and simulations, and the change was conducive to the catalytic reactions. DFT simulations also indicated that DBD generated O 3 and H 2 O 2 were decomposed to O atoms, OH groups and free OH by Ce/CoOOH. The presence of reductive species in DBD plasma was confirmed, and ⋅H was a kind of important reactive specie for CA degradation. CA degradation pathway was proposed based on the detected degradation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HYDROMETALLURGY
·
2016
·
IF 2.29
Shengting Kuang,Zhifeng Zhang,Yanling Li,Guolong Wu,Haiqin Wei,Wuping Liao
A novel extractant, di (2-ethylhexyl) (2-((2-ethylhexyl) amino) propan-2-yl) phosphonate (DEHAPP, abbreviated as B ), was synthesized for the selective extraction of Ce(IV) in sulfate medium. The effect of contact time, the H 2 SO 4 concentration, the DEHAPP concentration and temperature on the Ce(IV) extraction were studied systematically. DEHAPP exhibits a good extraction ability towards Ce(IV) when compared with other neutral organophosphorus extractants such as Cyanex 923, Cyanex 925 and DEHEHP. The extraction equilibrium constants and thermodynamic parameters (Δ G , Δ H and Δ S ) were calculated. The extraction reaction of Ce(IV) is an endothermic process. The extracted complexes were determined to be H 2 SO 4 · B ( org ) and Ce(HSO 4 ) 2 SO 4 ·2 B ( org ) . A extraction process to selectively recover Ce(IV) from bastnaesite leaching was proposed, by which the purity of cerium product reached 99.5% with a yield of 90.7%.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Jiajin Huang,JiaYu Chen,Jinze Yao,Siyao Zhao,Xingbei Wu,Qibin Xia
The challenge for selective catalytic reduction (SCR) of NO x with NH 3 is to improve de-NO x activity at low temperatures while simultaneously improving the tolerance of catalysts towards SO 2 poisoning. Herein, V and Ce oxides were loaded on deactivated SCR catalysts subjected to acid pickling (CAT) via impregnation to recover de-NO x activity. The resulting V–Ce@CAT catalyst exhibited 85–95% NO x conversions over a wide temperature window of 200–450 °C while conversions of only 40–78% over the same temperature range were observed with CAT (spent catalyst treated with acid). Interestingly, in addition to the high tolerance towards SO 2 displayed by V–Ce@CAT, the catalyst exhibited improved reactivity after the introduction of 200 ppm SO 2 , with the NO x conversion increasing from 80% to 87%. The results indicated that a kinetic equilibrium was reached between the formation and decomposition rates of Ce 2 (SO 4 ) 3 on V–Ce@CAT which prevented the accumulation of surface sulfate species, thereby protecting the main active species V from catalytic inactivation. Furthermore, in situ DRIFTS revealed that the NH 3 -SCR reaction pathway of V–Ce@CAT follows the L-H mechanism.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 3
·1778-1788
·
IF 4.186
Xiao Ma,Zhifeng Huang,Hailong Yuan,Yujuan Zhou,Meijuan Li,Fei Chen,Qiang Shen
Rare-earth-doped transparent glass shows great potential in white light-emitting diodes (wLEDs) application due to its excellent optical and luminous properties. Currently reported commercial wLEDs have a drawback in red emission missing, which leads to a relatively low color rendering index (CRI) and a relatively high correlated color temperature (CCT). In this work, Ce@Eu Sr–Si–O glass is fabricated using a high-temperature quenching method. The white light is available when the ratio of Ce 3+ /Eu 3+ equals 1, and the emitting color can be adjusted from blue to red by controlling the ratio of Ce 3+ /Eu 3+ . To further optimize the white light, Eu 3+ ions can be reduced to Eu 2+ according to the reaction of 6Eu 3+ + 2N 3− → 6Eu 2+ + N 2 ↑ by introducing Si 3 N 4 . As a result, the standard white light emission can be achieved in the Ce@Eu silicate glass contributed by the blue light from Ce 3+ , red light from Eu 3+ , and yellow–green light from Eu 2+ (two elements, three emission). This glass shows excellent luminous properties, such as a color coordinate is (0.3651, 0.3269) in CIE 1931 color coordinate diagram, a CRI is over 70, a high quantum yield of 36.02%, and a CCT of 4117 K.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zunchang Gao,Yanqing Wei,Xin Tian,Yang Liu,Xin Lan,Dawei Zhang,Shuaiyuan Han,Pengfei Huo
The synthesis of novel Ce/Fe bimetallic metal–organic frameworks (Ce/FcDA/FA-MOFs) via an innovative hydrothermal method is reported. This method utilizes Ce as the central metal and 1,1′-ferrocene dicarboxylic acid (FcDA) and formic acid (FA) as ligands. Optimization of hydrothermal time, feed ratio, and the addition of FA yielded Ce/FcDA/FA-MOFs with ideal ortho -dodecahedral hierarchical configurations. Comprehensive characterization via FT-IR, XRD, SEM, EDS, XPS, and N 2 adsorption/desorption analyses elucidated the influence of FA on morphology and chemical structure. Phosphate adsorption tests on Ce/FcDA/FA-MOFs revealed sustained strong selectivity and adsorption capacity, even in the presence of coexisting anions and variations in pH. Kinetic, thermodynamic, and isothermal simulations indicated spontaneous, efficient, and heat-absorbing phosphate adsorption properties on Ce/FcDA/FA-MOFs. Fitting parameters from the Langmuir adsorption model demonstrated a maximum adsorption capacity of up to 530.25 mg g −1 , attributed to physical/chemical adsorption during the reaction. Furthermore, investigation into the adsorption mechanism of Ce/FcDA/FA-MOFs on phosphate through FT-IR, XRD, and XPS analyses of the adsorbed samples revealed a complex process involving the electrostatic mutual attraction of outer-sphere entities and ligand exchange in the inner-sphere. This study advances our understanding of Ce/FcDA/FA-MOFs as effective adsorbents for phosphate and contributes to the development of environmentally sustainable materials with potential applications in water treatment.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 37
·374003
·
IF 3.551
Xitong Liang,Dongfeng Xue
Novel electrode materials with desired specific capacitances are needed for supercapacitors. Rare-earth (RE)-based materials are fascinating in the field of catalysis and energy. Herein, a series of hydroxides including La, Ce, Pr and Nd was synthesized via in situ precipitation. Interestingly, only Ce(OH)3 showed a redox peak in both positive and negative ranges. The other RE hydroxides exhibited a redox peak only in the positive range. Therefore, in order to certify that Ce(OH)3 can be used as a negative electrode, symmetrical supercapacitors consisting of Ce(OH)3 as both positive and negative electrodes were assembled, and showed a voltage window of 1.3 V. Moreover, asymmetrical supercapacitors were successfully fabricated, in which the positive electrode was composed of La(OH)3, Pr(OH)3 or Nd(OH)3. These results may pave the way to novel negative electrode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Chunlei Zhang,Guangyan Xu,Yanshuang Zhang,Chuang Chang,Miao Jiang,Luna Ruan,Min Xiao,Zidi Yan,Yunbo Yu,Hong He
Selective catalytic reduction of nitrogen oxides with methane (CH 4 -SCR) has emerged as a promising technology for mitigating exhaust emissions from natural gas vehicles, while its insufficient catalytic activity and durability are key barriers to application. In this study, novel Ce/In-CHA OXZEO catalysts were prepared, demonstrating exceptional catalytic performance and stability in the CH 4 -SCR reaction. Over these OXZEO catalysts, indium species predominantly existed in the form of InO + and In x O y within the CHA zeolite framework, while CeO 2 nanoparticles primarily resided as an external layer. During the CH 4 -SCR reaction, NO oxidation to form NO 2 and nitrate species was triggered by CeO 2 , which further enhanced the activation of CH 4 on InO + sites, thus boosting the low-temperature CH 4 -SCR process by facilitating the formation of the key intermediate CH 3 NO 2 . The synergy between InO + and CeO 2 underscores the exceptional performance and stability of the Ce/In-CHA with a low SiO 2 /Al 2 O 3 ratio in reducing NO x and CH 4 emissions.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 22
·3551-3561
·
IF 2.7
Kaigang An,Xin Li,Jia Chen,Shuang Zhang,Jing Xiao,Qing Wang,Hongdeng Qiu
Tetracycline (TC) as a broad-spectrum antibiotic, is widely used in the prevention and treatment of various bacterial diseases. However, its abuse in the livestock industry may lead to interference in human microecology, thereby causing various side effects. In this study, deep eutectic solvents (DESs) were synthesized using L-(–)-threonine (L-(–)-Thr) and cerium nitrate hexahydrate (Ce(NO3)3·6H2O), and later lanthanum nitrate hexahydrate (La(NO3)3·6H2O) was doped to synthesize La–Ce hybrid nanorods. These nanorods can be used for the determination of TC with high sensitivity and selectivity by the colorimetric method. This approach has a linear response to TC between 0.05 μM and 10 μM, with a detection limit of 0.016 μM. In this system, good dispersion provides the substance with a distinct peroxidase activity, which is used to create a colorimetric sensor for detecting TC. Mechanism studies show that the superoxide radical generated by the La–Ce nanomembrane plays a key role in peroxidase catalysis. Finally, the practicality of the method was verified by the determination of TC in food products (milk, pork and honey), which demonstrated that a good recovery rate can be obtained (91.4–102%).
研究领域:
分析化学
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食品安全
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 6
·1258
·
IF 3.1
Min Liu,Yansen Zhang,Song Hu,Guohong Zhou,Xianpeng Qin,Shiwei Wang
Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm3, which was close to its theoretical density of 6.70 g/cm3, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Jiaxu Zhao,Weilong Du,Dan Su,Xiaoyan He,Xiuqin Bai
Biofilms attached to various surfaces can lead to significant adverse effects in multiple areas. Cerium metal-organic framework (Ce-MOF) can function as haloperoxidase; however, their initial activity is relatively low. This study proposes a post-treatment method to enhance their enzymatic activity through the oxidation of the initial Ce-MOF. The research elucidates the haloperoxidase activity and anti-biofilm properties of Ce-MOFs. The synthesized Ce-MOFs exhibit a nanorod structure. The oxidized Ce-MOFs demonstrate substantial haloperoxidase activity, even in an alkaline environment. Both the initial and oxidized Ce-MOFs demonstrate exceptional antibacterial properties, with a concentration of 50 mg/L effectively eliminating bacteria within 30 min. The oxidized Ce-MOFs benefit from improved haloperoxidase activity, resulting in a significantly enhanced ability to inhibit biofilm formation and, consequently, improved anti-biofilm performance. This research offers methods for regulating the haloperoxidase activity of Ce-MOFs for marine antifouling applications.
研究领域:
生物化学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Mengqi Bian,Rui Liu,Qinghai Zhang,Yunlong Qu,Guanghui Chen,Jihai Duan,Hui Zhao,Weiwen Wang
The one-step preparation of methacrylic acid from isobutylene presents a significant challenge. In this study, three-dimensionally ordered macroporous (3DOM) Mo-V-P-Ce was synthesized using the hard template method and employed as a carrier for heteropolyacids in the selective oxidation of isobutene (IBN) to produce methacrylic acid (MAA). The CuNH 4 PAV@3DOM Mo-V-P-Ce catalyst developed through this method exhibits an ordered macroporous structure, which significantly enhances its thermal stability. Additionally, it contains a significant number of active species (VO 2 + ) and appropriate moderately strong acidic centers, which collectively improve the overall performance of the catalyst. The combination of CuNH 4 PAV with the 3DOM structure increases the surface concentration of oxygen vacancy species, thereby promoting the catalytic activity of the composite catalyst in converting these oxygen vacancy species into lattice oxygen species. Notably, the selectivity of the synthesized heteropolyacid catalysts for MAA increased to 84 % after loading. This work offers a novel approach to the development of efficient catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Qian Sun,Chun Zeng,Meng-Meng Xing,Bo Chen,Dan Zhao,San-Guo Hong,Ning Zhang
Deliberately engineering oxide composites on constructing and manipulating interactive structures particularly in surface layers was highly desirable for heterogeneous catalysis. Herein, upon the redox replacement reaction between Ce(IV) precursor (Ce(NO 3 ) 6 2 − ) and Cu 2 O nano-substrate, an attempt to directly engineer the surface structure of Cu-based substrate was performed by the Ce(IV)–Cu 2 O etching-embedding process, then the obtained powders were thermo-treated to get a series of Ce–O–Cu catalysts with different Ce:Cu molar ratios for NH 3 selective catalytic reduction (NH 3 -SCR) of NO. Characterized by ICP-OES, XRD, Raman, XPS, SEM, BET, H 2 -TPR, NO- and NH 3 -TPD measurements, it was demonstrated that the Cu–O–Ce catalysts were structured as CuO matrix with an interactive surface composed by co-present Cu(I)–Cu(II) and Ce(III)–Ce(IV) species, even the introduction of Ce was confined in a quite low loading range (0.83–2.3 wt.%); such a surface exhibited the distinct synergistic effect with positively manipulated physical-chemistry properties such as active site distributions, redox features and surface reactivity compared to pure CuO and traditional Cu–Ce composite catalyst, leading to attractive catalytic performance such as ≥ 9 0 % NO conversion with ≥ 9 5 % N 2 selectivity and the two-fold TOF enhancement versus traditional catalysts, even SO 2 was present in reactant mixture on well-manipulated catalyst (Ce loading at 1.6 wt.%) These results indicated that the etching-embedding strategy illuminated in this work could be referred as a feasible method to directly engineer and construct interactive oxide composite surface for advanced application as well as current efficient Ce–O–Cu catalytic interface for heterogeneous catalysis.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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