ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yangkai Xiong,Zhiqiang Fang,Daxiong Hu,Hao Jiang,Lei Huang,Qitong Mao,Guoqing Wang,Jipeng Li,Zhenzhong Liu,Chunxin Ma
Although many antibiofouling materials have been developed based on either bacterial-killing or antiadhesion effects, the integration of both the effects in one material remains challenging for achieving highly enhanced synergistic antibiofouling. In this study, we have explored a nano-CeO2-loaded double-network hydrogel by introducing CeO2 nanorods into a polyzwitterionic hydrogel via a simple one-pot method for achieving highly efficient antifouling. First, the CeO2 nanorods dispersed in the hydrogel, as an outstanding nanozyme, have highly efficient bacterial-killing performance. Second, the superhydrophilic polyzwitterionic hydrogel provides a dense hydrated layer on the surface and subsequently excellent broad-spectrum antiadhesion behavior. Most importantly, the bacterial killing and antiadhesion of this hydrogel can work synergistically to largely improve the marine-antifouling performance. Moreover, the double-network structure of this hydrogel, including the covalently cross-linked polyzwitterion hard network and the physically cross-linked poly(vinyl alcohol) soft network, can provide greatly improved mechanical properties (2.44 MPa of tensile strength reaches and 21.87 MPa of compressive strength). As a result, among the existing marine-antifouling hydrogels, the CeO2-loaded polyzwitterionic double-network hydrogel can achieve outstanding antifouling performance, which can sustain for over 6 months in a real marine environment. This work provides a promising marine-antifouling hydrogel, which will also inspire antifouling research of a new strategy and materials.
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PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Zhihan Wu,Kuan Ding,Guiying Lin,Hongqi Sun,Shu Zhang
Ketonization of oxygenated compounds in pyrolytic products of biomass is an effective means for deoxygenation and upgrading of bio-oils. However, the ketonization potential of biomass-derived sugars and the mechanism underneath remain unclear. On this basis, a series of Fe doped CeO 2 catalysts were synthesized and employed for catalytic ketonization of xylan. Characterization of the catalysts proved the successful formation of the Fe-CeO x solid solution. Doping an appropriate amount of Fe (20–33%) ions on CeO 2 could obviously increase the number of oxygen vacancy and basic sites by up to 56.31% and 29.6%, respectively. During the catalytic reaction of xylan, pure CeO 2 exhibited a good ketonization ability during xylan pyrolysis, and the introduction of a certain amount of Fe further enhanced the ability. The highest yield of ketones was obtained by 33%Fe-CeO 2 , which was 38% higher than pure CeO 2 . The selectivity to linear ketones (acetone and 2-butanone) reached a maximum of 85% for 57%Fe-CeO x . Thus, oxygen-rich compounds had been converted to low oxygen containing and high-quality ketone components. Introducing Fe into CeO 2 favored the production of ethylene glycol rather than 2,3-dihydroxy propanal, and thus promoted the yield of acetone. This investigation provides fundamentals for the deoxygenation of biomass through catalytic ketonization, aiming at the production of value-added ketone products.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12261-12269
·
IF 6.4
Ying-Jie Ma,Jing-Wen Wang,Guo-Chao Zhuang,Yang Zhang,Zi-Long Zhang,Ming-Yue Zhang,Guang-Bin Ji
To overcome the effect of high actuation voltages causing dielectric elastomer films to breakdown, fabricating films with excellent dielectric properties and high durability is the current focus. Previously reported dielectric elastomer films, nevertheless, still require better dielectric properties and suffer from a lack of self-healing properties, which reduces the service life of the films. In this work, polysulfide polyurethane–urea (PSPU) elastomers with self-healing properties were synthesized through the insertion of dynamic disulfide bonds into the polymer chain segments via hydrogen transfer reactions. In addition, PSPU-based composites were fabricated in which the filler was MXene loaded with CeO2 obtained using a hydrothermal method. Benefiting from dynamic disulfide bonding and multiple hydrogen bonding interactions, PSPU attained a self-healing efficiency of 95%. Moreover, the 5.25 vol% CeO2@MXene/PSPU composite exhibited a dielectric constant of 206 at 100 Hz, maintaining a loss of 0.19 while having a self-healing efficiency of 97.9%. In contrast to PSPU, the dielectric constant of 5.25 vol% CeO2@MXene/PSPU was 34 times higher than that of the former at 100 Hz. These distinctive properties promise to render the films an integral part of the actuator.
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高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Ziliang Yuan,Xun Li,Guanghui Wang,Zhihua Zhu,Yuhe Liao,Zehui Zhang,Bing Liu
The selective hydrogenation of N -heteroarenes into N -heterocycles is a highly important organic transformation in fine chemical industry, as N -heterocycles are moieties in a variety of pharmaceutical and bioactive compounds. Here, we report highly efficient mesoporous CeO 2 supported Ni catalysts prepared by the incipient wet impregnation and following high-temperature reduction for the selective hydrogenation of N -heteroarenes. The experiments indicated that the synergistic effect between CeO 2 and Ni nanoparticles was responsible to the superior catalytic performance. Various kinds of N -heterocycles were obtained at 120 °C with yields of 86 ∼ >99%, demonstrating the versatility of the developed method. This work is valuable for guiding the design and manipulation of low metal loading, cost-effective and robust hydrogenation catalysts.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2602
·
IF 5
Xiaoyan Liu,Zitao Wu,Yaoyao Lyu,Tianyu Li,Heng Yang,Yanqi Liu,Ruidan Liu,Xian Xie,Kai Lyu,Surendra P. Shah
Reinforced concrete structures in the marine environment face serious corrosion risks. Coating protection and adding corrosion inhibitors are the most economical and effective methods. In this study, a nano-composite anti-corrosion filler with a mass ratio of CeO2:GO = 4:1 was prepared by hydrothermally growing cerium oxide on the surface of graphene oxide. The filler was mixed with pure epoxy resin at a mass fraction of 0.5% to prepare a nano-composite epoxy coating. The basic properties of the prepared coating were evaluated from the aspects of surface hardness, adhesion grade, and anti-corrosion performance on Q235 low carbon steel subjected to simulated seawater and simulated concrete pore solutions. Results showed that after 90 days of service, the corrosion current density of the nanocomposite coating mixed with corrosion inhibitor was the lowest (Icorr= 1.001 × 10−9A/cm2), and the protection efficiency was up to 99.92%. This study provides a theoretical foundation for solving the corrosion problem of Q235 low carbon steel in the marine environment.Keywords:graphene oxide;cerium dioxide;nanocomposite coating;simulated concrete pore liquid;erosion resistance
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高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Jiawen Chen,Qingjie Meng,Feng Bi,Jingkun Chen,Xiaole Weng,Zhongbiao Wu
Catalytic destruction is an ascendant technology for the abatement of volatile organic compounds (VOCs) originating from solvent-based industrial processes. The varied composition tends to influence each VOC's catalytic behavior in the reaction mixture. We investigated the catalytic destruction of multi-component VOCs including dichloromethane (DCM) and ethyl acetate (EA), as representatives from pharmaceutical waste gases, over co-supported H x PO 4 -RuO x /CeO 2 catalyst. A mutual inhibitory effect relating to concentrations because of competitive adsorption was verified in the binary VOCs oxidation and EA posed a more negative effect on DCM oxidation owing to EA's superior adsorption capacity. Preferential adsorption of EA on acidic sites (H x PO 4 /CeO 2 ) promoted DCM activation on basic sites (O 2− ) and the dominating EA oxidation blocked DCM's access to oxidation centers (RuO x /CeO 2 ), resulting in boosted monochloromethane yield and increased chlorine deposition for DCM oxidation. The impaired redox ability of Ru species owing to chlorine deposition in turn jeopardized deep oxidation of EA and its by-products, leading to increased gaseous by-products such as acetic acid originating from EA pyrolysis. Notably, DCM at low concentration slightly promoted EA conversion at low temperatures with or without water, consistent with the enhanced EA adsorption in co-adsorption analyses. This was mainly due to that DCM impeded the shielding effect of hydrolysate deposition from rapid EA hydrolysis depending on the decreased acidity. Moreover, water benefited EA hydrolysis but decreased CO 2 selectivity while the generated water derived from EA was likely to affect DCM transformation. This work may provide theoretical guidance for the promotion of applied catalysts toward industrial applications.
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高影响因子
WATER ENVIRONMENT RESEARCH
·
2023
·Vol. 95
·期 5
·e10874
·
IF 3.1
Kai Su,Lin-xiao Li,Zhuo Zeng,Xue Yang,Qin Wang,Rong Cao,Cheng Yang,Han Zhang,Jun-min Chen,Wen-ya Tang,Xin Lin
La 2 O 3 and CeO 2 , as main rare earth oxides, with unique physical and chemical properties have been widely used in catalyst and grinding industry. In this study, the effects of La 2 O 3 and CeO 2 on the anaerobic process were investigated. The biological methane production tests showed that 0–0.05 g/L La 2 O 3 and 0–0.05 g/L CeO 2 enhanced anaerobic methanogenesis process. The result showed maximum specific methanogenic rates of La 2 O 3 and CeO 2 were 56.26 mL/(h·gVSS) and 49.43 mL/(h·gVSS) and, compared with the control, increased 4% and 3%, respectively. La 2 O 3 significantly reduced the accumulation of volatile fatty acids (VFAs), whereas CeO 2 had no similar effect. Dissolution experiments demonstrated that the content of extracellular La in the anaerobic granular sludge reached 404 μg-La/g volatile suspended solid (VSS), which was 134 times higher than that of extracellular Ce (3 μg-Ce/gVSS). The content of intracellular La reached 206 μg-La/gVSS, which was 19 times higher than that of intracellular Ce (11 μg-Ce/gVSS). The different stimulation between La 3+ and Ce 3+ could be attributed to the different dissolution of La 2 O 3 and CeO 2 . The result of this work is helpful to optimize anaerobic processes and to develop novel additives. Practitioner Points Novel anaerobic additives were developed. La2O3 and CeO2 in 0–0.05 g/L enhanced organics degradation and methane production. The addition of La2O3 significantly reduced the accumulation of volatile fatty acids. The solubilization of La2O3 was stronger than CeO2. The promoting effects of low concentrations of La2O3 and CeO2 were derived from dissolved La and Ce.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Zeyu Jiang,Shengying Zhao,Yuhao Yang,Minghui Tan,Guohui Yang,Yisheng Tan
As one of the most important green chemicals, dimethyl carbonate (DMC) has wide application prospects in electrochemistry, fuel additive, solvent and building block in organic synthesis. The effective utilization of CO 2 to synthesize DMC has been proved to be highly advantageous. In this study, a series of Ce-BTC MOF-derived nanorod CeO 2 catalysts for the direct synthesis of DMC from CO 2 and methanol were prepared via complexation reaction at room temperature and then thermal decomposition under different atmospheres. The calcination atmosphere had great influence on the structure and catalytic properties of obtained CeO 2 catalysts. The CeO 2 derived from calcination of Ce-BTC at 500 °C under H 2 atmosphere exhibited higher specific surface area, oxygen vacancy concentration and CO 2 adsorption capacity. And thus, its DMC yield was up to 6.332 mmol/g CeO2 within 4 h, much higher than that of commercial nano CeO 2 and other as-prepared catalysts in absence of dehydrating agents.
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高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Songil Sin,Jiawei Ji,Lijun Cheng,Zhiwen Gu,Chong Tan,Kwangchol Ri,Changjin Tang
CeO 2 -based catalysts are widely investigated for selective catalytic reduction (SCR) of NO with NH 3 . Interaction of NO/O 2 with CeO 2 generally produces two surface species, i.e., nitrates and nitrites. However, the explicit quantification of these two species is still unresolved. Herein, we reported that spectrophotometry characterization was effective in determining surface adsorbed NO x species on CeO 2 by measuring the corresponding ions (NO 2 – and NO 3 – ) dissolved in aqueous solution. Experimental results show that both nitrate (–NO 3 ) and nitrite (–NO 2 ) species can be quantitatively evaluated and the accuracy is verified by calibrating with NO x -TPD result. Exclusive transfer of adsorbed NO x from catalyst surface to aqueous solution is confirmed and the dissolution process can be accelerated by ultrasonic treatment. Moreover, useful information related to evolution of surface NO x species under various conditions (O 2 treatment, different adsorption temperature and duration) and over different catalysts (Fe 2 O 3 , MnO 2 and MnO x –CeO 2 ) are provided. The result of present study demonstrates the potential of spectrophotometry for quantitative discrimination of surface NO x species on CeO 2 and other oxide-based materials, which is conducive to mechanism analysis of SCR reaction.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huan Jiang,Baihui Wang,Ruyi Tang,Yaoyu Tan,Mengyao Qi,Xia Zhang
Although thiourea and its derivatives are applied in medical, food, and chemical industries, sensitive thiourea detection remains a challenging and noticeable topic. Surface-enhanced Raman spectroscopy assay based on an enzyme-inhibition strategy is promising for the detection of thiourea residues. Therefore, in this study, Ag/CeO 2 nanomaterials with dual enzyme-Like Activities were synthesized to detection thiourea. We discovered that the Ag/CeO 2 nanozymes demonstrated strong peroxidase-like activity and oxidase-like activity, moreover they can accelerate and catalyze 3,3′,5,5′-tetramethylbenzidine enzymatic reaction , with significantly increasing the Raman signal. Instead, once thiourea was introduced into Ag/CeO 2 nanozymes, due to the influence of thiourea molecules occupation and nanozymes aggregation, the peroxidase-like activity and oxidase-like activity of Ag/CeO 2 decreased sharply, and the colorless substrate 3,3′,5,5′-tetramethylbenzidine would not undergo color changes. Based on this observation, a Raman method for detecting thiourea using oxidized 3,3′,5,5′-tetramethylbenzidine as a probe molecule was developed. The Raman intensity showed a good linearity for the concentration of thiourea in the range of 10 −11 M−10 −1 M with a correlation coefficient of R 2 = 0.9881, and the limit of detection is 2.4 × 10 −13 M. Therefore, the proposed Raman mode sensors exhibited excellent selectivity and anti-interference ability which offers a new avenue for exploiting environmental monitoring.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·3161-3180
·
IF 3.3
Liu Wenyi,Sun Dedong,Ma Hongchao,Ma Chun,Zhang Xinxin,Hao Jun
In the present work, a novel CeO 2 /ZIF-9 composites were prepared, characterized and used as a multiphase catalyst to activate peroxymonosulfate (PMS) to degrade methylene blue (MB). The effects of Ce/Co molar ratio, catalyst dose, PMS concentration, initial solution pH and reaction temperature were explored. The results showed that 20 mg/L MB was almost absolutely degraded, and the removal rate of COD reached 77.8% by 150 mg/L PMS activated with 50 mg/L 0.50-CeO 2 /ZIF-9 within 30 min at room temperature (20 °C) and initial pH 6.4. The active species such as SO 4 •− , 1 O 2 and • OH performed important roles in the catalytic process, as evidenced by quenching experiment and electron paramagnetic resonance (EPR) analysis. The synergistic catalytic mechanism of 0.50-CeO 2 /ZIF-9 in the heterogeneous activation of PMS was proposed, which mainly involves the enhanced redox cycle of Co 3+ /Co 2+ by Ce 3+ donated electrons. Recycling experiments suggested that the removal efficiency of MB can still reach 92.9% after four catalytic cycles, indicating good reusability of 0.50-CeO 2 /ZIF-9 catalyst. Therefore, because of its easy preparation, superior catalytic performance and reusability, the 0.50-CeO 2 /ZIF-9 composite catalyst has promising applications in water treatment.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 27
·期 3
·679-694
·
IF 2.747
Tai Xiaoming,Liu Cansen,Chen Wanlin,Mai Yongjin,Zhang Liuyan,Wu Xinghua,Jie Xiaohua
Rubber tires, as an important part of automobiles, are produced by molding operation under molten temperature and high pressure. However, mold fouling during the vulcanization process is a rock-ribbed problem that not only leads to the loss in productivity and degradation of product quality but also results in severe accidents and enormous economic losses. In this work, a promising Co-Mo/CeO 2 composite coating was electroplated and investigated to solve the mold fouling problem. The effect of CeO 2 content on the surface morphology, microstructure, hardness, tribological and electrochemical behavior is systematically studied. With an addition of 10 g/L CeO 2 , the Co-Mo/CeO 2 composite coating not only possesses the highest microhardness, the best wear and corrosion resistance but also features hydrophobicity and remarkable mold antifouling performance. This study offers a new strategy for producing composite coatings with excellent performance to reduce mold fouling in practical tire industry applications. Graphical Abstract
Co-Mo/CeO 2 composite coatings with excellent corrosion and wear resistance as well as low surface energy were simply electrodeposited and applicated for antifouling in tire mold for the first time.
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高影响因子
危险品化学品经营许可证（带存储）