JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 9
·6690-6697
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IF 2.22
Liu Xingbin,Meng Fanming,Yu Bo,Wu Hao
The flower-like CeO 2 /MoS 2 heterojunction was composed by self-assembly of MoS 2 nanoflowers and ultrafine CeO 2 nanoparticles through high-temperature nitrogen annealing. The crystal structure, morphology, specific surface area, chemical state, and optical properties of flower-like CeO 2 /MoS 2 heterostructure material were analyzed by XRD, SEM, (HR) TEM, BET, XPS, UV–Vis, and PL characterization methods. Flower-like CeO 2 /MoS 2 heterostructure material has a large specific surface area and strong adsorption capacity. In the photodegradation of methyl orange, the 20% CeO 2 /MoS 2 material has the best photocatalytic performance, the degradation efficiency of 20% CeO 2 –MoS 2 reaches 96.1% in 90 min and the reaction rate constant ( k ) is 0.0325 min −1 , far exceeding the single-component MoS 2 and single-component CeO 2 . After detailed analysis, we know that the large specific surface area, excellent visible light absorption, and rapid separation of electron–hole pairs help to effectively improve photocatalytic efficiency.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jiayi Wu,Yuhang Zheng,Jiali Fu,Yafei Guo,Jun Yu,Jie Chu,Pu Huang,Chuanwen Zhao
Integrated CO 2 capture with reverse water gas shift (RWGS) reaction to produce syngas represents a promising technology to realize C1 recycling and utilization. Designing highly efficient Ni–CaO dual function materials (DFMs) is the key to achieve integrated CO 2 capture and utilization (ICCU). In this work, Ni–CaO–CeO 2 DFMs powders and pellets are prepared by the wet mixing, coprecipitation and sol–gel methods using acetate and nitrate precursors. Physicochemical properties and ICCU performance of the Ni–CaO–CeO 2 DFMs depend on synthetic mode, precursor, and granulation process. NiCaCe-SG (A) and NiCaCe-SG (N) prepared by sol–gel method show excellent ICCU-RWGS performance due to the developed pore structures, enhanced surface basicity, uniform Ni dispersion, minimized Ni grain size, abundant oxygen vacancies and reinforced reducibility. The NiCaCe-SG (A) sample prepared using acetate salts as precursors exhibits better ICCU-RWGS performance than the nitrate precursors-derived NiCaCe–SG (N) DFMs. Granulation adversely affects the CO 2 capture capacity, CO yield and working stability of the NiCaCe–SG (N) sample due to declined textural properties, weakened surface basicity and reducibility. NiCaCe–SG (A) represents an excellent DFMs candidate for ICCU-RWGS with high CO 2 uptake and conversion rate of 15.34 mmol CO 2 /g and 92.4 %, great CO yield and CO selectivity of 5.97 mmol CO/g and 89.1 %, and good working stability (a low decay rate of 11.6 % in 10 cycles). These results have provided new insights into the rational design of high-performance DFMs for ICCU applications.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Zuozhu Yin,Zihao Li,Yuanting Deng,Mingshan Xue,Yuhua Chen,Junfei Ou,Yu Xie,Yidan Luo,Chan Xie,Zhen Hong
Complicated contaminants in wastewater, such as intractable oils, organic colors, and adhering organisms, have generated major environmental problems that are hazardous to ecosystems and human health, and wastewater purification is complex and difficult to achieve with a single substance or single process. A facile yet environmentally friendly technique for fabricating a superhydrophobic, oil-water separation, anti-bioadhesion, and photocatalytic Pulp/cellulose nanofibers (CNFs) membrane for all-in-one wastewater treatment is presented here. In this strategy, the hierarchical micro/nanostructured CeO 2 nanoparticles and stearic acid (STA)-coated Pulp/CNF (Pulp/CNF-CeO 2 -STA) membrane is fabricated via a straightforward and easy-to-operate coating method, which simultaneously endows the membrane with superwetting ability, good oil-water separation capacity, notable photocatalytic degradation capacity, and outstanding anti-bioadhesion action. According to the experimental results, the suitably prepared Pulp/CNF-CeO 2 -STA membrane displayed superior superhydrophobicity (water contact angle: 166 ± 2°), high separation efficiency (88%), and high throughput (73 L·m −2 ·h −1 ). This Pulp/CNF-CeO 2 -STA membrane also showed significant photocatalytic degradation (>94%) of organic dye pollutants in water, as well as good anti-bioadhesive performance against Chlorella . As such, it serves several functions in wastewater treatment, considerably simplifying installation and saving money in application. In conclusion, this unique coating process is environmentally benign and very practicable, paving the door for the development of multi-functional materials in environmental treatments.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
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2023
·
IF 17.1
Bo Yuan,Zicong Tan,Qiang Guo,Xiutong Shen,Chao Zhao,Jian Lin Chen,Yung-Kang Peng
Nanozymes are promising alternatives to natural enzymes, but their use remains limited owing to poor specificity. For example, CeO2 activates H2O2 and displays peroxidase (POD)-like, catalase (CAT)-like, and haloperoxidase (HPO)-like activities. Since they unavoidably compete for H2O2, affecting its utilization in the target application, the precise manipulation of reaction specificity is thus imperative. Herein, we showed that one can simply achieve this by manipulating the H2O2 activation pathway on pristine CeO2 in well-defined shapes. This is because the coordination and electronic structures of Ce sites vary with CeO2 surfaces, wherein the (100) and (111) surfaces display nearly 100% specificity toward POD-/CAT-like and HPO-like activities, respectively. The antibacterial results suggest that the latter surface can well-utilize H2O2 to kill bacteria (cf., the former), which is promising for anti-biofouling applications. This work provides atomic insights into the synthesis of nanozymes with improved activity, reaction specificity, and H2O2 utilization.
研究领域:
生物化学
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材料科学
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Junli Nie,Gangqiang Zhu,Weibin Zhang,Jianzhi Gao,Peng Zhong,Xiaotao Xie,Yu Huang,Mirabbos Hojamberdiev
Flower-like n -type CeO 2-δ is hybridized with p -type β-Bi 2 O 3 nanoparticles to design a novel β-Bi 2 O 3 /CeO 2-δ p - n heterojunction photocatalyst via a thermal treatment process of Bi/Ce(CO 3 )(OH) precursor. The synthesized β-Bi 2 O 3 /CeO 2-δ exhibits a remarkable enhancement in NO removal and significant suppression of toxic intermediates nitrogen dioxide (NO 2 ) under visible light irradiation. The superior photocatalytic activity of β-Bi 2 O 3 /CeO 2-δ for NO removal is mainly derived from the synergistic effects of the oxygen vacancies (OVs) and p-n heterojunction. The OVs not only enhance the visible light utilization and boost the separation of electron-hole pairs but also improve the adsorption and activation of NO and O 2 . Particularly, the p-n heterojunction is beneficial for the interfacial migration of photogenerated charge carriers. Electron spin resonance (ESR) and trapping experiment reveal that the synergistic effects of OVs and p-n heterojunction can induce the generation of more active species. The electrochemical measurements and density-functional theory (DFT) calculations in-depth confirm that both p-n heterojunction and OVs can accelerate the interfacial charge transfer, resulting in the deep oxidation of reactants. Therefore, the flower-like β-Bi 2 O 3 /CeO 2-δ p-n heterojunction photocatalyst exhibits an advanced photocatalytic activity for deep NO removal and a suppressed NO 2 generation. In addition, monitoring the reaction products by in situ Fourier transform infrared spectrum (FTIR) further validates that the main products of nitrates are formed during the photocatalytic process. This work demonstrates a straightforward approach for construction of p-n heterojunction photocatalysts, which can enhance the effective photocatalytic activity and stability for NO removal.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Yuanyuan Chai,Lu Zhang,Qianqian Liu,Fengli Yang,Wei-Lin Dai
Oxidation of amines to imines under light irradiation has been widely studied in the field of heterogeneous catalysis. For the first time, we demonstrate a facile mixing calcination approach for the preparation of CeO2/g-C3N4-x as a heterojunction catalyst for the photo-oxidative coupling of benzylamine under the irradiation of a 300 W Xe arc lamp at 308 K with the air balloon. It was found that the rate constant of CeR/CN-66% was 3 times as high as that of pure CeO2 or g-C3N4. All kinds of structural characterizations suggested the formation of heterojunction between the CeO2 and g-C3N4, serving as a tunnel for the transfer of photoinduced charge, which may contribute to the improvement of photoactivity. Moreover, the Ce3+ ions and oxygen vacancy significantly promoted the adsorption and activation of substrate or molecular O2. Therefore, the efficient separation of the charges, the prolonged photoinduced electron lifetime, and the abundant defect structure (increased content of Ce3+ ions or the oxygen vacancy) were considered as the main factors for the higher photo-oxidation efficiency of the CeR/CN-66%. Another striking observation that was noticed was that the CeR/CN-66% was recycled up to five cycles under the same condition and was found to be highly efficient without any obvious decrease in the activity or selectivity due to the outstanding stability of the defect structure. Thus, highly efficient CeR/CN-x heterojunction catalyst was synthesized in this work by a simple approach for the photo-oxidation of benzylamine under mild reaction conditions, and this finding may provide wide applications in other photocatalysis areas.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Zhiqing Cui,Weikang Wang,Cuijiao Zhao,Chun Chen,Miaomiao Han,Guozhong Wang,Yunxia Zhang,Haimin Zhang,Huijun Zhao
We present the self-assembly synthesis of core–shell structure Au/CeO2 composites with different Au loadings through a spontaneous chemical redox approach at an ambient temperature utilizing HAuCl4 and Ce(NO3)3 as reaction substrates in an alkaline environment. The results demonstrate that the as-synthesized Au/CeO2 composites exhibit spherical shape morphologies with porous structures, composed of Au nanoparticle (∼10 nm) cores and CeO2 nanoparticle shells with abundant oxygen vacancies. The introduction of Au nanoparticles in CeO2 not only effectively improves the visible light utilization efficiency but also provides rich surface catalytic active sites for highly efficient visible light photocatalysis. As visible light photocatalysts (λ > 400 nm), the as-synthesized Au/CeO2 composites with the Au loading amount ≥4.0 wt % exhibit high conversion and selectivity (∼100%) of benzyl alcohol to benzaldehyde under the given experimental conditions. Moreover, Au/CeO2 also shows a general applicability as a visible light photocatalyst for the selective oxidation of other alcohols to corresponding aldehydes or ketones. The photocatalytic mechanism studies indicate that the photoelectrons/holes produced from the photoexcited Au and the formed superoxide radicals in the oxygen vacancies of CeO2 synergistically contribute to the high performance of the selective photocatalytic oxidation of alcohols to aldehydes or ketones.
研究领域:
材料科学
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光化学
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催化科学
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Peng Xu,Tianguan Wang,Jingsha Tan,Wenfeng Ge,Huixuan Qian,Yanwei Zeng,Bing Lei,Honglei Guo,Zhiyuan Feng,Guozhe Meng
In this work, a new type of hollow mesoporous CeO 2 microsphere (HMCM), synthesized through a template-free approach, was utilized as both an inhibitor and a nanocontainer for loading the corrosion inhibitor benzotriazole (BTA). These microspheres were encapsulated with a co -deposition layer composed of polydopamine (PDA) and polyethyleneimine (PEI) to construct smart containers (PDA-PEI@HMCM-BTA) with pH-responsive release properties. The corrosion inhibition effect of PDA-PEI@HMCM-BTA nanocontainers was assessed and the release rate of BTA and Ce ions from the nanocontainers was greatly accelerated in the presence of acidic solutions. Electrochemical impedance spectroscopy (EIS) was conducted to evaluate the barrier properties and active anti-corrosion performance of the coatings. The results showed that the integration of nanocontainers within the waterborne epoxy coating significantly improved the corrosion resistance and self-healing capabilities, thereby providing efficient corrosion protection for carbon steels. The method offered a simplified synthesis route for Ce-based nanocontainers and presented a strategy for producing waterborne epoxy coatings with active anticorrosive properties.
研究领域:
材料科学
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腐蚀与防护
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
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2019
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IF 4.888
Xiaohui Liu,Liangbo Xie,Yigang Liu,Peng Zhao,Yugui Han,Shanshan Cheng,Xiaoyu Bai,Yi Li
Herein, an excellent cathode of ZnO-CeO 2 /CF was fabricated successfully via one-step electro-deposition method for the degradation of ciprofloxacin (CIP) in sewage by electro-Fenton (EF) technology. The detailed characterizations of ZnO-CeO 2 /CF material were conducted by SEM, XRD, XPS, CV and EIS. Effects of deposition time, initial pH and voltage value on degradation performance of ZnO-CeO 2 /CF were investigated systematically. The results showed nearly 100% degradation efficiency was easily obtained at 2 h owing to the large specific surface area of cathode, the good oxygen storage ability and Fenton-like performance of ZnO-CeO 2 . It was worth to mention that the favorable capability still existed in cathode body after 10 consecutive runs. Moreover, electron paramagnetic resonance (EPR) test and sacrificial agent experiments revealed that the increase of active substance accelerated the degradation efficiency of CIP during the process of valence state transition of Ce 3+ /Ce 4+ or Fe 2+ /Fe 3+ .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Saudi Chemical Society
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2024
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IF 5.8
Liang Guo,Shijin Zhou,Yanju Liu,Huaixia Yang,Mingsan Miao,Wei Gao
Herein, a sandwich electrochemical sensing strategy for aflatoxin b 1 (AFB 1 ) detection based on hybrid-nanoengineering was presented. First, Au nanoparticle was doped into zeolitic imidazolate framework-8 (ZIF-8) to form Au@ZIF-8 by in-situ growth method, followed by multi-walled carbon nanotubes (MWCNTs) addition to synthesize MWCNTs/Au@ZIF-8 via self-assembly. The structural “confinement effect” of ZIF-8 afforded a microenvironment for Au nanoparticles and SMCNTs in a certain spatial region, giving MWCNTs/Au@ZIF-8 excellent electrochemical property as the substrate material. In addition, Au-Pt bimetallic nanoparticle, which exhibited excellent stability and catalytic activity was loaded on the hollow cerium oxide (CeO 2 ) to form AuPt@CeO 2 nanoparticle through one-step aqueous phase reduction. Owning to its high surface-to-volume ratio, satisfied electron transfer efficiency and biocompatibility, massive toluidine blue (TB) and AFB 1 antibody (Ab) could be modified on the AuPt@CeO 2 to form AuPt@CeO 2 -Ab-TB, which acted as signal tag for the ultrasensitive assay of AFB 1 . The proposed electrochemical sensing system exhibited wide detection range (2 × 10 -5 − 20 ng/mL) and low detection limit (2.13 fg/mL), which has been successfully applied to AFB 1 determination in four real samples. The hybrid nanoengineering presented in this work is an active attempt to prepare high-performance substrate material and signal tag, which provides a new insight for the development of highly sensitive and specific electrochemical sensing systems.
研究领域:
食品安全检测
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纳米材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AEROSOL SCIENCE
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2016
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IF 2.278
Nafeng Wang,Shuiqing Li,Yichen Zong,Qiang Yao
Dispersed palladium on the high-surface-area ceria support is synthesized via one-step flame-assisted spray pyrolysis method, which applies a highly-quenched stagnation-point flame controlling catalyst sizes and structures. The X-ray photoelectron spectroscopy (XPS) spectra of Pd show a significantly high binding energy for flame-made Pd/CeO 2 catalysts, possessing a value of 1.7 eV larger than the reference value in literature. It suggests that the partial electron transfer occurs from metal Pd to their supports during the synthesis process, which creates Pd electron-deficient (cationic Pd δ+ ) and Ce electron-rich (anion Ce δ − ), respectively. The catalytic activities of CH 4 oxidation are performed over the temperatures ranging from 200 °C to 600 °C. In comparison with inert support materials, the synergistic effect is found between palladium and support ceria that leads to the enhanced catalytic activity. During the heating and cooling cycles of CH 4 oxidation, Pd/CeO 2 catalysts exhibit an exceptional inhibition effect against the sintering of Pd cluster and its dispersion decrement, which is related to strong electronic interaction of metal-support interfaces induced by the aforementioned partial electron transfer.
研究领域:
催化化学
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材料科学
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纳米科技
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环境催化
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能源化学
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表面科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yapeng Xiang,Jie He,Na Sun,Yuteng Fan,Liming Yang,Caihong Fang,Long Kuai
The atomically dispersed catalysts have aroused great attention in the recent decade. However, the preparation of atomically dispersed Au catalysts presents more challenge than other atomically dispersed catalysts such as Pt, Pd, etc. From the aspect of support, this work contributes a novel hollow mesoporous CeO 2 microspheres (CeO 2 -hm) for efficient dispersion of single Au atoms (Au 1 ). Contributed by the high specific surface area and mesoporous structure, CeO 2 -hm possesses much higher capacity for undertaking Au 1 , than commercial CeO 2 particles (CeO 2 -c). Typically, with Au loading of 0.2 at%, CeO 2 -hm supported Au (Au 1 /CeO 2 -hm) presents atomic dispersion while CeO 2 -c supported Au (Au/CeO 2 -c) contains large amount of Au nanoparticles . Confirmed by catalyzing the water-gas shift (WGS) reaction, the obtained Au 1 /CeO 2 catalysts exhibit notably higher performance than the Au-based catalysts supported by CeO 2 -c and CeO 2 synthesized through co-precipitation and sol-gel strategies. For example, 0.2 at% Au 1 /CeO 2 -hm exhibits 9.1 times reactivity of equal Au loaded Au/CeO 2 -c catalyst. Besides, the CeO 2 -hm supported single-atom Au catalyst presents good tolerance under long-time WGS running.
研究领域:
催化化学
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纳米材料科学
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能源化学
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表面科学
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无机功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）