Journal of Inorganic and Organometallic Polymers and Materials
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2019
·Vol. 30
·期 5
·1589-1599
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IF 1.637
Zhao Peng,Zhang Jinteng,Jiang Jingjing,Wang Hongtao,Xie Tengfeng,Lin Yanhong
A novel Pt/CeO 2 /ZnO ternary composite is synthesized via two simple procedures of hydrothermal and photoreduction. The crystal structure, morphology, and composition of as-prepared samples are characterized by XRD, SEM, HRTEM, XPS and UV–Vis DRS. Because both ZnO and CeO 2 are good photocatalytic semiconductors, photocatalytic activities of the samples are evaluated by the degradation of phenol aqueous solution (25 mg/L). Under the strong interaction among the Pt, CeO 2 and ZnO, the maximum photocatalytic activity is observed in the Pt/CeO 2 /ZnO ternary composites and 91% phenol can be degraded in 60 min under UV light irradiation. The probable photocatalytic mechanism is discussed by active species trapping experiments along with SPV, TPV, PL and PA measurements. The enhanced photocatalytic activity is attributed to the redox cycle of Ce 4+ ↔ Ce 3+ , the effective interface between ZnO and CeO 2 as well as the electron transfer action of Pt nanoparticles. The photocatalytic activity almost unchanged after four cycles and proves excellent reusable photocatalysts. This work shows the synergistic effect of rare earth elements and noble metals in the photocatalytic process, which facilitates their practical application in toxic pollution abatement.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Yuanfeng Li,Tian Qin,Yaxiao Ma,Jing Xiong,Peng Zhang,Kezhen Lai,Xi Liu,Zhen Zhao,Jian Liu,Liwei Chen,Yuechang Wei
Herein, a series of Co x -CeO 2 nanosheet catalysts were elaborately synthesized by a one-step hydrothermal method. The CeO 2 microsphere with crossed nanosheets can improve the soot-catalyst contact efficiency and the lattice substitution of Co ions for cerium sites in CeO 2 results in the oriented lattice bending of Co-CeO 2 nanosheets for improving adsorption/activation properties of NO and O 2 . Co 2 -CeO 2 catalyst displays the highest H 2 O-tolerance activity ( T 50 = 334 °C, TOF = 1.32 h −1 ) and excellent stability during soot oxidation in the presence of H 2 O. Combined with characterizations and DFT calculations, the mechanism was proposed: the active edge sites located at the oriented lattice bending of Co-CeO 2 nanosheets can activate surface oxygen and gaseous O 2 , and active oxygen species can boost NO oxidation to NO 2 , which is a crucial step of NO x -assistant catalytic mechanism for soot oxidation. It provides a promising way for the rational design of high-performance non-noble metal catalysts for soot oxidation in practical applications.
研究领域:
催化
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环境科学
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材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
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2021
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IF 4.126
Liwei Wang,Rongrong Han,Yanfu Ma,Melis S. Duyar,Wei Liu,Jian Liu
More than 25% of chemical transformations involve at least one hydrogenation step. Selective hydrogenation of unsaturated aldehydes is an essential process in the industrial production of pesticides and pharmaceutical synthesis. Since C═C hydrogenation with lower bond energy is thermodynamically favored over C═O hydrogenation, the selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL) is relatively challenging. Herein, we report a series of Pt-CeO2 nanoreactors with different spatial locations and microenvironments of Pt nanoparticles (NPs) on hollow CeO2 that are active for the selective hydrogenation of CAL to COL. We show the effects of active metal spatial location, microenvironment, metal–support interactions, and Fe doping on the activity and selectivity within Pt-CeO2 nanoreactors. Pt@Fe-CeO2 shows excellent catalytic performance with an 88.9% selectivity for COL at a CAL conversion of 97.2%. The variations of the electronic and crystal structure after Fe doping, simultaneously, and the linear adsorption of CAL on the CeO2 hollow structure contribute to the high performance of selective hydrogenation to COL. Our findings might shed light on the rational design of the nanoreactors for catalytic organic transformations with desired selectivity.
研究领域:
催化化学
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材料科学
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有机合成
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
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IF 6.5
Yuxi Meng,Shaomian Liu,Yixi Wang,Wenqing Xu,Jiajian Gao,Sansan Yu,Fabing Su,Tingyu Zhu
Selective catalytic reduction of NO using CO (CO-SCR) is a promising technology for the purification of NO in the flue gas. However, the presence of O 2 significantly inhibits the activity of the CO-SCR catalyst. Herein, we synthesize a hollow Mn-doped CeO 2 @Co 3 O 4 catalyst (Mn-CeO 2 @Co 3 O 4 ), which achieved 82% NO conversion, 100% CO conversion, and 78% N 2 selectivity under 5 vol% O 2 at 200 °C, superior to those of CeO 2 @Co 3 O 4 and Co 3 O 4 @CeO 2 catalysts. The characterization results indicate that the strong electronic interaction at the heterointerfaces between Co 3 O 4 and CeO 2 plays a crucial role in promoting selective adsorption of NO. Furthermore, the Mn doping into the Co 3 O 4 lattice of the catalyst facilitates the conversion of N 2 O intermediates, thereby enhancing the overall activity. This research provides a new strategy for the design and synthesis of CO-SCR catalysts.
研究领域:
催化
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 42
·14723-14731
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IF 7.059
Lele Li,Liwei Yang,Si Zhang,Yuping Sun,Fen Li,Tengteng Qin,Xiaoqiang Liu,Yanmei Zhou,Subbiah Alwarappan
Herein, we designed a NiCo2S4@N/S–CeO2 composite with amplified electrocatalytic oxygen reduction (OR) capability by the in situ growth of NiCo2S4 nanoparticles on CeO2 nanospheres with simultaneous doping of nitrogen and sulfur. After optical characterization of the composite, it was then employed as the signal amplification label for constructing an electrochemical aptasensor. The composite provides a biocompatible and large surface platform to load biomolecules and retain their bioactivity. More importantly, the composite shows a comparable electrocatalytic OR capability similar to a commercial Pt/C catalyst and far better than CeO2, attributed to the NiCo2S4 deposition and oxygen vacancies introduced by N and S doping. Furthermore, the Koutecky–Levich plots indicate a nearly four-electron transfer pathway of the ORR. The as-prepared aptasensor exhibited a highly sensitive and selective determination of a model analyte-sulfadimethoxine with a wide linear range of 0.05–180 nM, a low detection limit of 0.02 ± 0.0011 nM and good feasibility for real-sample detection. This work paved an effective way for the design of highly efficient electrocatalysts with bright prospects in bioanalytical applications.
研究领域:
电化学
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生物传感器
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Tao Zhou,Lixin Tian,Shiqi Xu,Xiaohui Wu,Delai Zhong,Mingjie Huang
Harnessing inherent organic pollutants in wastewater to drive self-accelerated Fenton-like degradation establishes a sustainable water purification paradigm, wherein the central challenge centers on strategically regulating catalyst-pollutant interaction to optimize phenoxyl radical formation and leverage its inherent catalytic synergy. Here, we demonstrate that a CuO-CeO 2 heterostructure combining Cu(II) active centers with Ce(IV) electron reservoirs achieves unprecedented enhancement in phenoxyl radical generation efficiency. This breakthrough arises from two synergistical mechanisms: strong metal-support interaction (SMSI) elevates the d -band center of Cu to thermodynamically favor spontaneous electron abstraction from pollutants, while the electron buffering capability of CeO 2 accelerates the Cu(II)/Cu(I) redox cycle for efficient active site regeneration. The optimized CuO-CeO 2 /persulfate (PDS) system exhibits 19.2-fold enhanced kinetic constant ( k obs ) for p -chlorophenol (4-CP) degradation compared to the CuO/PDS counterpart, alongside remarkable pH versatility across 3.5-10. Crucially, the phenoxyl radical-mediated oxidation demonstrates exceptional operational stability with consistent 100% 4-CP removal over eight consecutive cycles, contrasting sharply with the 56.3% efficiency decline observed in CuO. This work establishes a strategic framework for advancing phenoxyl radical-mediated AOPs (PR-AOPs) toward sustainable water purification technologies.
研究领域:
环境科学
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材料工程
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化学工程
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可持续技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2025
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IF 4.7
Fuhan Mai,Jianguo Deng,Jialu Chen,Yingchun Lu,Xing Li,Xue Liu,Lanxiang Ji,Xiaofeng Bai
Radiation protection products (RPPs) with safety and comfort are essential for people who are exposed to nuclear radiation. However, achieving a balance between safety and comfort in the existing RPPs is extremely challenging. Here, a waterborne polyurethane (WPU) foam containing CeO2 is proposed to address this challenge. Flower-shaped CeO2 (FCeO2) and spherical CeO2 (SCeO2) are synthesized by adding urea during the hydrothermal reaction. Then, the WPU is foamed with sodium dodecyl sulfate (SDS). Finally, CeO2 and WPU are thoroughly amalgamated to yield the CeO2/WPU foam. Compared with SCeO2, FCeO2 forms a micronano porous structure between FCeO2 and WPU, which improves the thermal insulation. Additionally, experiments and simulations have shown that FCeO2 improves the radiation protection performance. Fortunately, FCeO2/WPU foams also provide antimicrobial properties and are lightweight, along with their benefits of radiation protection and insulation.
研究领域:
辐射防护
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材料科学
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高分子科学
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核工程
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热工学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
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IF 6.7
Changming Zhang,Yuan Wang,Xiaochao Zhang,Zhiyan Dong,Wensheng Wu,Caimei Fan
It is rather essential to increase CO 2 adsorption and improve separation efficiency of photoinduced carriers by solar-driven CO 2 reduction. Herein, we proposed a facile approach to synthesize millimeter-sized polyacrylonitrile-based carbon spheres (PANACSs) as a bifunctional adsorbent and self-nitrogen-doped source under a mild condition, and then embeds the highly active CeO 2 to construct a CeO 2 @PANACSs composite with strong adsorption capacity and high reduction activity. The involved XRD, XPS, SEM, N 2 adsorption/desorption, CO 2 adsorption, UV–vis DRS, EIS, PL and In situ FTIR spectra were characterized. Results suggested that the obtained PANACSs can act as a catalyst to drive the reduction of CO 2 into CO under visible light irradiation. CeO 2 @PANACSs showed the highest performance of photocatalytic reduction of CO 2 for 10 h (210.65 μmol·g −1 ), and the yield of CO evolution is approximately 1.83 times and 17.42 times higher than that of pristine CeO 2 and PANACSs, respectively. We found that the existence of nitrogen-containing functional groups further promoted the adsorption and activation of CO 2 . Among them, pyridinic nitrogen and pyrrolic nitrogen can be used as adsorption and activation sites to accelerate the separation and transfer of e - -h + . Furthermore, Ce 4+ on the surface of CeO 2 acts as an electron capture agent, which captures the electrons that are not transferred in time and reduces itself to Ce 3+ , and then the formed Ce 3+ reduces the adsorbed CO 2 to CO. Finally, the possible mechanism is proposed to depict the photocatalytic CO 2 reduction over the CeO 2 @PANACSs. Our finding provides a noteworthy promising strategy to construct bifunctional composite photocatalysts for achieving the high-efficient CO 2 adsorption and photoreduction to CO.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Hongqiang Xu,Hailong Wang,Yixia Lu,Yanbo Zeng,Yiwen Yang,Zulei Zhang,Hongmei Wang,Xiao Wang,Lei Li
A rapid and simple fluorescence probe based on CeO 2 quantum dots (QDs) was developed for highly selective and ultrasensitive direct determination of 4-nitrophenol (4-NP). CeO 2 QDs were prepared using the sol-gel method with the precursor of Ce(NO 3 ) 3 ·6H 2 O as a cerium source. The products were characterized through high-resolution electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The fluorescent probe based on CeO 2 QDs exhibited a broad linear response to the concentration of 4-NP in the range of 0.005–75.00 μM and provided a low detection limit of 1.50 nM. The fluorescence of CeO 2 QDs was quenched by 4-NP through the fluorescence resonance energy transfer mechanism owing to the well overlaps between the fluorescence emission spectrum of CeO 2 QDs with the ultraviolet absorption spectrum of 4-NP. This result was confirmed by the time-resolved fluorescence spectra and the evaluation of the interaction distance between CeO 2 QDs and 4-NP. The prepared CeO 2 QDs are successfully applied to the determination of 4-NP in real water samples, where the spiked recoveries range from 98.2% to 102.4%.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Lei Wang,Chuyang Liu,Guoyue Xu,Shanshan Xiang,Mengyu Shi,Yujing Zhang
CeO 2 powders with flaky morphology and high floating rate are fabricated successfully by ball-milling and stearic acid modification. The influences of ball-milling time and surfactant stearic acid content on the morphology, floating rate, infrared emissivity of CeO 2 powders as well as the CeO 2 /epoxy-silicone coatings have been investigated systematically. The results show that the CeO 2 powders transform from irregular grains with larger size to flake grains with smaller size by ball-milling for 4 h. The floating rate of CeO 2 enhances from 0 cm 2 /g to 89.06 cm 2 /g by increasing stearic acid content from 0 wt% to 1 wt% while diminishes to 60.477 cm 2 /g with stearic acid content of 3 wt%. Ultimately, the coating with CeO 2 fillers ball-milled by 4 h and modified by 1 wt% of stearic acid exhibits the lowest emissivity value of 0.831 in the 8–14 μm waveband. The mechanisms for small and flaky fillers as well as high floating fillers to achieve low emissivity coatings are also fully revealed.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Zhixin Zhang,Yehong Wang,Min Wang,Jianmin Lü,Lihua Li,Zhe Zhang,Mingrun Li,Jingyang Jiang,Feng Wang
We herein report the effects of CeO 2 crystal planes on the oxidative coupling of alcohols and amines to form imines. CeO 2 exhibits significant catalytic activity under mild reaction conditions (60 °C) during the synthesis of 13 different imines, giving >89% conversions and >90% selectivities. The crystal planes of CeO 2 greatly affect the catalytic performance. Among the crystal planes investigated (the (110), (100) and (111) planes), the (110) plane shows the strongest redox ability and thus the best catalytic activity, generating a 97% yield of the imine at 60 °C in 2 h, because it contains the highest concentration of oxygen vacancies.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Yuyan Yan,Renlu Han,Huijun Zhang,Pengxin Song,Xiangjun Wei,Yafei Hou,Jiancheng Yu,Keqi Tang
Chemodynamic therapy (CDT), which employs Fenton/Fenton-like agents to decompose hydrogen peroxide (H 2 O 2 ) into toxic hydroxyl radical (•OH) to induce cancer cell apoptosis and necrosis, holds great promise in tumor therapy due to its high selectivity . Nevertheless, its efficiency is impaired by the insufficient intracellular H 2 O 2 concentration and/or the insensitive response of Fenton/Fenton-like agents to the slightly acid tumor microenvironment (pH∼7.0–6.5). Herein, we develop a novel CDT reagent based on CeO 2 quantum dot (QD) decorated MgO 2 nanosheets engineered with cascade reactions to boost the intracellular H 2 O 2 level and high pH-activated (pH = 6.5) characteristic for an enhanced CDT. Under the tumor microenvironment (pH = 6.5), MgO 2 nanosheets that are highly reactive can react with H 2 O to produce nontoxic Mg 2+ and abundant H 2 O 2 , boosting the intracellular H 2 O 2 level. The self-generated H 2 O 2 is subsequently converted into •OH by CeO 2 QD, which is served as a relatively high pH-activated (pH = 6.5) Fenton-like agent. The sufficient intracellular H 2 O 2 supply and sensitive response to the slightly acid tumor sites significantly improve the Fenton reaction, leading to the excellent in vivo CDT results with tumor growth inhibition effect. Our work presents a distinctive paradigm for self-boosting CDT efficacy.
研究领域:
医学
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生物材料学
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肿瘤治疗学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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