MOLECULES
·
2023
·Vol. 29
·期 1
·41
·
IF 4.6
Jianbin Luo,Xinbo Zhu,Zhiwei Zhong,Geng Chen,Yu Hong,Zijian Zhou
A series of Co-M (M = Fe, Cr, and Mn) catalysts were synthesized by the sol-gel method for soot oxidation in a loose contact mode. The Co-Fe catalyst exhibited the best catalytic activity among the tested samples, with the characteristic temperatures (T10, T50, and T90) of 470 °C, 557 °C, and 602 °C, respectively, which were 57 °C, 51 °C, and 51 °C lower than those of the CoOxcatalyst. Catalyst characterizations of N2adsorption–desorption, X-ray diffraction (XRD), X-ray photo-electron spectrometry (XPS), and the temperature programmed desorption of O2(O2-TPD) were performed to gain insights into the relationships between the activity of catalytic soot oxidation and the catalyst properties. The content of Co2+(68.6%) increased due to the interactions between Co and Fe, while the redox properties and the relative concentration of surface oxygen adsorption (51.7%) were all improved, which could significantly boost the activity of catalytic soot oxidation. The effects of NO and contact mode on soot oxidation were investigated over the Co-Fe catalyst. The addition of 1000 ppm of NO led to significant reductions in T10, T50, and T90by 92 °C, 106 °C, and 104 °C, respectively, compared to the case without the NO addition. In the tight contact mode, the soot oxidation was accelerated over the Co-Fe catalyst, resulting in 46 °C, 50 °C, and 50 °C reductions in T10, T50, and T90compared to the loose contact mode. The comparison between real soot and model Printex-U showed that the T50value of real soot (455 °C) was 102 °C lower than the model Printex-U soot.Keywords:soot oxidation;Co-based catalyst;NO;real soot;contact mode
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高影响因子
Materials
·
2023
·Vol. 16
·期 15
·5478
·
IF 3.4
Yaohui Xu,Liangjuan Gao,Pingkeng Wu,Zhao Ding
A cubic fluorite-type CeO2with mesoporous multilayered morphology was synthesized by the solvothermal method followed by calcination in air, and its oxygen storage capacity (OSC) was quantified by the amount of O2consumption per gram of CeO2based on hydrogen temperature programmed reduction (H2–TPR) measurements. Doping CeO2with ytterbium (Yb) and nitrogen (N) ions proved to be an effective route to improving its OSC in this work. The OSC of undoped CeO2was 0.115 mmol O2/g and reached as high as 0.222 mmol O2/g upon the addition of 5 mol.% Yb(NO3)3∙5H2O, further enhanced to 0.274 mmol O2/g with the introduction of 20 mol.% triethanolamine. Both the introductions of Yb cations and N anions into the CeO2lattice were conducive to the formation of more non-stoichiometric oxygen vacancy (VO) defects and reducible–reoxidizable Cen+ions. To determine the structure performance relationships, the partial least squares method was employed to construct two linear functions for the doping level vs. lattice parameter and [VO] vs. OSC/SBET.Keywords:CeO2;doping;solvothermal;oxygen storage capacity;porous
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高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4825-4833
·
IF 2.8
Yu Dan,Dong Seng,Liu Qian,Jia Weiyi,Gao Faming,Wang Yatao
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass activity of the series of Pd-based catalysts followed the descending order: PdNi NWs/C > commercial Pt/C > PdCo NWs/C > PdFe NWs/C > pure Pd NWs/C. The optimal half-wave (E 1/2 ) of PdNi NWs/C (839 mV) is positive shift 138 and 25 mV compared with pure Pd NWs/C (701 mV) and commercial Pt/C (814 mV), respectively. The mass activity (MA) of PdNi NWs/C only dropped 28% after 10,000 potential cycles between 0.6 and 1.1 V versus RHE in acid medium. This work provides a promising and reliable strategy to synthesize high performance Pd-based electrocatalyst, which is promising alternative to expensive Pt-based electrocatalysts for fuel cells. Graphical Abstract TOC: We prepared bimetallic PdNi nanowires, which ORR mass activity higher than pure Pd nanowires and commercial Pt/C in acidic medium.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yuxin Wan,Zhenze Xie,Mingjie Wang,Yuelian Liu,Mubin Zheng,Dong Xu,Chang Du
Osteosarcoma (OS) is one of the most common primary bone malignancies in children and adolescents worldwide. The serious side effects and multi-drug resistance of high-dose chemotherapy have become the major cause of the failure in OS treatment. Curcumin (Cur) is reported to selectively kill OS cells and has a low cytotoxicity on healthy osteoblasts, but its delivery remains a great challenge. Herein, a co-polymer-Cur prodrug (co-prodrug) was developed by polymerizing Cur with hydrophilic polymer modified by succinic anhydride (SA) to explore the physicochemical properties, drug release and potential biological effects for OS treatment. This design endowed the co-prodrug with excellent solubility and stability under different solution conditions (pH = 4.5, 7.4 and 8.5), and improved the release efficiency of reactive oxygen species. Interestingly, co-prodrug exhibited an esterase-triggered rapid drug release in a concentration-dependent manner rather than the well-known acid response. Moreover, co-prodrug could be internalized into cells through endocytosis and significantly inhibit the proliferation of OS cells. Additionally, co-prodrug had no obvious systemic toxicity, and could suppress the OS growth by promoting apoptosis, inhibiting proliferation activity and vascularization in vivo. Our research furnishes a fresh perspective for the formulation design of controlled release of insoluble and instable anticancer agents within tumor cells.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xueling Wang,Yanwei Li,Xinhui Jin,Guang Sun,Jianliang Cao,Yan Wang
Gas sensor constructed with metal oxide semiconductor (MOS) has attracted a growing concern owing to its feasibility for rapid detection of various harmful and pollutant gases . However, the sensors made of pure MOS usually suffer from the drawbacks of high working temperature, low sensitivity and poor selectivity. Herein, we propose a Co-doping strategy to upgrade the gas sensing performance of In 2 O 3 . To expound it, Co-doped In 2 O 3 porous nanospheres (Co-In 2 O 3 PNSs) with the diameter of ∼120 nm was prepared from home-made In(OH) 3 NSs via a soaking-lyophilization-calcination method and their sensitive performance towards several volatile organic compounds (VOCs) was investigated in detail. Compared to pure In 2 O 3 sensor, the best Co-In 2 O 3 sensor (with optimized 0.5 mol% Co) exhibited outstanding improvements in triethylamine (TEA) sensing performance, especially including lower optimal working temperature (OWT: 220 °C vs 320 °C), higher response (R a /R g : 3500 vs 60 for 10 ppm TEA), and better selectivity (selectivity coefficient S TEA /S ethanol : 400 vs 1850). Besides, an interesting selectivity transformation from ethanol to formaldehyde was also observed after Co doping. These improvements of Co-In 2 O 3 PNSs were mainly attributed to their reduced crystallite size, increased oxygen vacancy concentration, narrowed bandgap, as well as upshifted Fermi level , whose mechanism was discussed.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 33
·15569-15578
·
IF 3.3
Shengbiao Zheng,Jialong Fan,Feilong Yin,Jie Chen,Zhenzhen Hui,Jing Tang,Xuchun Wang,Jiahao Guo
A heterostructured TiO2/Co nanoparticle/N-doped carbon nanotube (TiO2/Co/NCNT) nanomaterial was derived from ZIF-67@TiO2 by calcination at high temperature in an Ar/H2 atmosphere. The obtained TiO2/Co/NCNT composite was made up of numerous dodecahedron-like boxes with twisting nanotubes on surfaces, modified on a glassy carbon electrode (GCE) for the electrochemical determination of tert-butylhydroquinone (TBHQ). The excellent electrocatalytic performance of TBHQ could be owing to the combination of multi-phase composition, fast electron transfer and the constructed Co/Ti multi-active sites. The TiO2/Co/NCNT sensor showed a broad linearity from 0.04 to 100 μM with a low detection limit of 4 nM, and possessed stability, anti-interfering ability and reproducibility. Finally, the analytical utility of the TiO2/Co/NCNT sensor was checked by detecting TBHQ in edible oil.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xingye Zeng,Cunhui Lin,Qinggang Ren,Shufeng Shan,Hanlu Wang
Developing a highly efficient catalyst is one of the important topics in the field of oxidative desulfurization from liquid fuels. In this study, the composite metal oxide catalysts (CuO-MgO) with co-catalyst MgMoO 4 were prepared by co-precipitation method with simple process, high efficiency and good performance and their structures characterized. An efficient extractive catalytic oxidative desulfurization (ECODS) system for liquid fuel was successfully developed on the basis of as-prepared CuO-MgO-MgMoO 4 (CuMgMo) as the catalyst, sodium hypochlorite (NaClO) as the oxidant, and acetonitrile as the extractant. Taking the n -decane and n -tetradecane containing dibenzothiophene (DBT) as the test model oil sample, the main parameters influencing desulfurization performance were examined in detail, such as the molybdenum content, the dosage of CuMgMo, the reaction temperature, the initial S-concentration, the different extractants, the volume ratio of extractant to oil, the different oxidants, and the molar ratio of NaClO to DBT . Based on optimized desulfurization reaction conditions, the model oil containing different sulfur compounds (benzothiophene, 4-methyldibenzothiophene, and 4,6-dimethyldibenzothiophene) and the real oil (straight-run gasoline, straight-run kerosene, and straight-run diesel) were further tested. Based on the free radical trapping experiments and the calculation of density functional theory, the reaction mechanism was deeply explored. The results showed that the de-electron reaction of DBT was mainly catalyzed by MgMoO 4 and the reaction of HClO obtaining electron was mainly catalyzed by CuO. MgMoO 4 plays an assisting role in improving the catalytic reaction rate. This work will provide a useful reference for the construction of efficient ECODS system using composite metal oxides.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yanan Huang,Konghu Tian,Chao Zhang,Jing Wang,Ruiwen Shu,Zhihong Chen,Xiaowei Liu,Yufei Li,Lixin Xu
Biomass material has gained significant popularity due to its potential to meet the requirements of green and sustainable development in modern times. It is widely used in various fields, especially for absorbing electromagnetic waves (EMW). In this study, we used luffa sponge carbon (CLS) as a lightweight and porous carbon source. Through a static reaction and heat treatment process, we successfully loaded coral sheet cobalt onto the surface of CLS to create lightweight and efficient luffa sponge carbon/cobalt (CLS/Co) composites for EMW absorption. We controlled the microstructure and electromagnetic properties of the CLS/Co composites by adjusting the pyrolysis temperature. At 700 °C, the CLS/Co composites showed a minimum reflection loss ( RL min ) of –60.81 dB and an effective absorption bandwidth (EAB) of 5.56 GHz at a very thin thickness of 1.68 mm. Moreover, at a pyrolysis temperature of 800 °C, the absorption strength of the CLS/Co composites reached –50 dB at various thicknesses.
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高影响因子
Materials
·
2023
·Vol. 16
·期 17
·5785
·
IF 3.4
Weiran Zhang,Ziyu Li,Guohua Wu,Wei Wu,Hailan Zeng,Haiyun Jiang,Weili Zhang,Ruomei Wu,Qiong Xue
The utilization of Co-Cr-Fe-based black pigments bears considerable significance within the realm of commercial ceramic pigments, owing to their distinctive spinel structure, remarkable high-temperature stability, and exceptional chromatic attributes. This study delves into the synthesis of diverse black pigment configurations by employing the co-precipitation method, leveraging the interplay of these three metallic oxides. This investigation encompasses a comprehensive scrutiny of ion valences, crystal structures and parameters, colorimetric properties, and their interrelationships. The methodology integrates the response surface methodology (RSM) framework, using theoretical formulations to navigate the material ratios and elucidating the associations between the resultant compositions and color coordinate values, aligned with the CIE-Lab* colorimetric methodology. The derived predictive models yielded an optimized black pigment composition, characterized by heightened black intensity and a refined formulation.Keywords:black ceramic pigment;response surface methodology;co-precipitation method;chromatic properties;spinel
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xuewen Xie,Jinbo Zhao,Shangtao Liang,Xiong He,Chenghao Yu,Ruzhen Xie,Jiale Xu,Lihui Yang,Dengmiao Cheng,Hui Lin
Herein, we reported using nontoxic Ce for co-doping to reduce the dopant amount of highly toxic Sb, resulting in a boost to the ability of SnO 2 reactive electrochemical membrane (REM) in the oxidation of refractory herbicide atrazine (ATZ). The study found that co-doping Ce causes the expansion of SnO 2 crystal and yields numerous defects on the SnO 2 crystal surface, creating more reactive sites and significantly enhancing the catalytic activity of Sb-doped SnO 2 REM. A single-pass through the Sb, Ce co-doped SnO 2 REM system could reduce ATZ in a real groundwater sample from a 10 μg·L –1 of feed concentration to steadily below the EAP regulatory maximum contaminant level of 14 nM. The addition of high concentrations of chloride and natural organic matters greatly inhibits the oxidation of ATZ, whereas solution pH and bicarbonate have less effect. Quenching experiments demonstrate that hydroxyl radical ( • OH) plays the key role in ATZ oxidation. The degradation by-products of ATZ were identified using high-resolution mass spectrometry , and possible degradation pathways, including • OH‐induced de-alkylation and • OH de-chlorination processes, were proposed based on the by-products’ concentration changes. Biological toxicity tests using freshwater green algae Chlorella vulgaris demonstrated that the toxicity of ATZ effluent was greatly eliminated.
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高影响因子
Forests
·
2023
·Vol. 14
·期 5
·965
·
IF 2.9
Gaojun Chen,Yudong Li,Enshan Han,Ziqiang Zhang,Xiaohui Yang,Desheng Zhou,Yanzhen He
The optimization of supercapacitive properties in carbon materials derived from cheap and sustainable wood scraps exhibits great application potential. Herein, in support of interfacial groups, polyaniline nanospheres were in situ constructed in the internal pore structure of wood scraps; further, the B and N elements were imported by carbonized and hydrothermal methods. The doped B regulated the species of N doping to improve the electrical conductivity of carbonized wood scraps, and it endowed a certain pseudo-capacitance. Coupled with the fine double-layer capacitance from the hierarchical structures constructed by carbonized nanospheres and wood scrap channels, a high specific capacitance of 406 F g−1at 0.5 A g−1, high energy density (17.71 Wh kg−1at 250 W kg−1) and cycle stability (93.04% capacitance retention after 10,000 cycles) were performed simultaneously. This study provided a new strategy to improve the supercapacitive performance of bio-carbon materials in terms of structure and conductance.Keywords:wood scrap;B/N co-doping;porous carbon;in situ synthesis;supercapacitor
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxiang Li,Xi Chen,Lei Zhang,Ruishan Han,Iftikhar Hussain,Xiaoxia Ma,Kaili Zhang
Metastable intermolecular composites (MICs) composed by solid fuel and oxidizer can undergo violent redox reaction with release of huge amount of energy. Integration of MIC with microelectromechanical-system (MEMS) is of particular interest to meet the demand of miniaturization in modern pyrotechnic devices. Meanwhile, fluorine-containing oxidizers are favored in MIC owing to their potential to fluorinate the oxide passivation layer in common elemental fuels. Herein, Co(OH)F was employed for the first time as a novel fluorine-containing oxidizer in Al-based MIC. Vertically aligned Co(OH)F@Al nanobelt arrays (NAs) with tunable morphology were successfully fabricated on a variety of substrates (Si, glass, Ni, Cu, Ti) via a facile hydrothermal synthesis followed by electron beam evaporation. The whole fabrication process is highly compatible with modern MEMS technology. The thermal behavior of pure Co(OH)F and Co(OH)F@Al composites was comprehensively investigated by TG-DSC and a series of ex-situ and in-situ characterization. It was found that, Co(OH)F@Al composites achieved main exothermal reaction before melting of Al regardless of morphology and equivalence ratio. This feature is attributed to the etching of Al 2 O 3 shell by HF released from Co(OH)F which is termed as pre-ignition reaction. To elucidate the effect of micro-structure on the actual specific heat release, we proposed a phenomenological model which can be a reference for future micro-structure design of MIC.
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