Materials
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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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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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MACROMOLECULES
·
2023
·
IF 5.5
Lu-Lu Yang,Xue-Wei Wei,Tianyu Wu,Xiaoyu Meng,Hai-Mu Ye
Isomorphism is a distinctive kind of co-crystallization behavior of random copolymers and provides opportunities to regulate the crystalline structure and performance without the loss of crystallinity. Though the intrinsic structural differentiation would induce variation of accommodation capacity in the co-crystal lattice for different co-monomeric units, subtle manipulation of isomorphism has not been realized yet. In this study, butylene adipate (BA) as the crystallizable unit is incorporated into an isomorphism system model of poly(butylene succinate-ran-butylene fumarate) (PBSF) to form the terpolymers of PBSFA, and the crystallization features are investigated. It is confirmed that part of BA (i.e., ≤20 mol %) does not hinder the isomorphism formation in the terpolymers of PBSFA but influences the accommodation capacities of the isomorphic counterparts of butylene succinate (BS) and butylene fumarate (BF). When BA with 10 mol % is copolymerized, the adoption of BS unit in isomorphism becomes less favorable in comparison to the biopolymers of PBSF, showing an increase of the defect Gibbs free energy for the co-crystal and a decrease of the accommodation ratio of BS. However, with a further lifting of the BA content to 20 mol %, the accommodation preference of BS and BF in the isomorphism lattice reverses, and BS turns into a favorable unit instead of BF. Such a transition of accommodation capacity might be due to the deterioration of intersegmental interaction caused by the third co-crystallizable unit of BA. This work directly reveals the differentiation of co-monomeric units in the isomorphic lattice and sheds light on the manipulation of isomorphism.
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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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Shaojie Shi,Yifei Wang,Biaolong Wang,Fan Wu,Yange Suo,Zhiguo Zhang,Yousheng Xu
Rational design of efficient, cost-effective electrocatalyst towards oxygen reduction reaction (ORR) is of vital importance to the wide application of polymer electrolyte membrane fuel cells. In this work, a novel and simple Na 2 SO 4 -assisted pyrolysis strategy with ZIF-12 as the precursor is reported for the synthesis of cobalt, sulfur, nitrogen, co-doped carbon (termed as CoSNC- x Na 2 SO 4 -T) materials towards ORR. Different from CoNC-800 derived from pure ZIF-12, with the presence of Na 2 SO 4 , the derived CoSNC-0.5Na 2 SO 4 -800 material exhibits layered flake morphology with hierarchical meso-microporous structure. Besides, CoSNC-0.5Na 2 SO 4 -800 material shows higher content of pyridinic-N and graphitic-N, higher relative intensity of Co-N x , higher content of carbon defect, as well as larger specific surface area in comparison with CoNC-800, which results in higher activity of CoSNC-0.5Na 2 SO 4 -800. The CoSNC-0.5Na 2 SO 4 -800 material displays a half-wave potential of 0.88 V, which is superior to that of commercial Pt/C (half-wave potential being 0.86 V). Moreover, CoSNC-0.5Na 2 SO 4 -800 demonstrates a better durability compared with Pt/C. The pyrolysis temperature and the amount of Na 2 SO 4 are found to affect the physiochemical properties and electrochemical performance of the CoSNC- x Na 2 SO 4 -T materials. This work not only provides a facile and novel synthesis approach for the preparation of highly active Co, S, N co-doped carbon materials for ORR, but also disclosing the key structure properties for enhancing the performance of these catalysts.
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Journal of Energy Chemistry
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2022
·
IF 13.599
Qiang Zhang,Yinyin Qian,Ji-Jun Zou,Ruijie Gao,Huaming Yang
Facilitating sulfur reduction reaction (SRR) is a promising pathway to tackle the polysulfide shuttle effect and enhance the electrochemical performance of lithium-sulfur (Li-S) batteries. Catalysts with a solo active site can reduce a reaction barrier of a certain transition-intermediate, but the linear scaling relationship between multi-intermediates still obstructs overall SRR. Herein, we construct tandem Co–O dual sites with accelerating SRR kinetics by loading highly dispersed cobalt sulfide clusters on halloysite. This catalyst features Co with upshifted d -orbital and O with downshifted p-orbital, which cooperatively adsorb long-chain polysulfide and dissociate an S–S bond, thus achieving both optimal adsorption–desorption strength and reduced conversion energy barrier of multi-intermediates in SRR. The Li-S coin batteries using the electrocatalyst endows a high specific capacity of 1224.3 mAh g −1 at 0.2 C after 200 cycles, and enhances cycling stability with a low-capacity decay rate of 0.03% per cycle at 1 C after 1000 cycles. Moreover, the strategy of the tandem Co–O dual sites is further verified in a practical Li-S pouch battery that realizes 1014.1 mAh g −1 for 100 cycles, which opens up a novel avenue for designing electrocatalysts to accelerate multi-step reactions.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Yuanyao Dou,Yimin Zhang,Caiyu Lin,Rui Han,Yubo Wang,Di Wu,Jie Zheng,Conghua Lu,Liling Tang,Yong He
Multiple component integration to achieve both therapy and diagnosis in a single theranostic nanosystem has aroused great research interest in the medical investigator. This study aimed to construct a novel theranostic nanoplatform ferrite and ceria co-engineered mesoporous silica nanoparticles (Fe/Ce-MSN) antioxidant agent though a facile metal Fe/Ce-codoping approach in the MSN framework. The resulted Fe 3+ -incorporated ceria-based MSN nanoparticles possessing a higher Ce 3+ -to-Ce 4+ ratio than those revealed by ceria-only nanoparticles. The as-prepared Fe/Ce-MSN nanoparticles exhibited an excellent efficiency in scavenging reactive oxygen species (ROS), which is attributed to improving the superoxide dismutase (SOD) mimetics activity by increasing Ce 3+ content and maintaining a higher activity of catalase (CAT) mimetics via including ferrite ion in nanoparticles. The fast Fe/Ce-MSN biodegradation, which is sensitive to the mild acidic microenvironment of inflammation, can accelerate Fe/Ce ion release, and the freed Fe ions enhanced T 2 -weighted magnetic resonance imaging in the inflammation site. PEGylated Fe/Ce-MSN nanoparticles in vitro cell models significantly attenuated ROS-induced inflammation, oxidative stress, and apoptosis in macrophages by scavenging overproduced intracellular ROS. More importantly, Fe/Ce-MSN-PEG NPs exhibited significant anti-inflammatory effects by inhibiting lipopolysaccharide (LPS)-induced expression of tumor necrosis factor-α (TNF-α) and interleukin-1 beta (IL-1β) levels in vitro . Additionally, it can promote the macrophages polarization of pro-inflammatory M1 phenotype towards an anti-inflammatory M2 phenotype. Thus, the novel pH-responsive theranostic nanoplatform shows great promise for inflammation and oxidative stress-associated disease treatment.
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Xiang Long,Chenglin Wang,Yanshun Ma,Shaogui Wu,Liang Hao
Herein, multiple color (blue, green and red) emissive carbon dots (CDs) were synthesized from the main precursor via different protocols, with emission wavelengths of 439 nm, 528 nm and 623 nm, respectively, realizing the synthesis of fluorescent CDs spanning the fluorescence emission from short to long wavelengths. Their relative PLQYs reach up to 28.9%, 31.4% and 12.3%, respectively, exceeding the PLQYs of many similar CDs. The green CDs (G-CDs) and red CDs (R-CDs) show optimal photoluminescence performance in acetone (Me 2 CO); while the B-CDs have a pH-dependent response in the pH 2 to 12 range. All the three CDs have excellent photostability and salt resistance. Finally, serving as fluorescent anti-counterfeiting ink was taken as an example to briefly introduce the application of multi-color CDs. This work provides a new strategy to develop low-cost multiple color phosphors for display device, biological imaging, analysis and detection and other fields.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yunhan Bai,Xiaoshu Ding,Ying Sun,Yucong Song,Yanji Wang
The reverse water gas shift (RWGS) reaction is one kind of the catalytic conversion of CO 2 to reduce an enormous amount of CO 2 . However, the RWGS reaction has the safety hazards associated with the use of hydrogen and thermodynamic limitation. Therefore, this work proposes a new safe and efficient reaction route (CO 2 -MCH) to get CO from CO 2 and methylcyclohexane (MCH). Thermodynamic calculations showed that the equilibrium CO 2 conversion at 350 °C increased from 17.8 % of the RWGS reaction to 53.5 % of the CO 2 -MCH reaction. In the CO 2 -MCH reaction, the relationship of the catalytic performance with the metal dispersion, the Pt particle size and the acidity of Pt-based catalysts on the different supports was investigated, respectively. The results showed that the Pt/γ-Al 2 O 3 catalyst with high dispersion of Pt particles, small particle size and medium acidity had good activity and selectivity. The relationships among Pt loading and Pt particle size on the Pt/γ-Al 2 O 3 catalyst and the catalytic performance were evaluated. The Pt particle size gradually increased with the metal loading. A positive correlation was observed between Pt particle size and CO 2 conversion; a volcano-type relationship was observed between CO selectivity and Pt particle size. In the CO 2 -MCH reaction at 350 °C, 0.1 MPa, LHSV = 6 h −1 , the CO 2 conversion was 24.7 %, the CO selectivity reached 95.2 %, and the Pt/γ-Al 2 O 3 catalyst within 40 h showed good stability. Moreover, the mechanism of the CO 2 -MCH catalytic reaction over the Pt/γ-Al 2 O 3 catalyst was speculated.
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Food Bioscience
·
2022
·
IF 5.318
Xuan Chen,Jinwen Yu,Liufeng Zheng,Zeyuan Deng,Hongyan Li
Quercetin and lycopene are strong dietary antioxidants that often co-exist in foods . Here, the cardiac and neuroprotective effects of quercetin and lycopene combination were analyzed in d -galactose-induced oxidative stress in mice. ICR mice were divided into control group, d -galactose group (D-GAL), quercetin treatment (Q45: 45 mg kg −1 d −1 quercetin, Q60: 60 mg kg −1 d −1 quercetin), lycopene treatment (15 mg kg −1 d −1 lycopene), and M groups (45 mg kg −1 d −1 quercetin+15 mg kg −1 d −1 lycopene). Mice were given quercetin, lycopene, and their combination through oral gavage for 6 weeks. They were injected with d -galactose (150 mg kg −1 d −1 ) simultaneously except for the control group. Results showed that the quercetin-lycopene combination could ameliorate histopathological injuries in the heart and hippocampus. They significantly decreased the serum and heart malonaldehyde (MDA) levels, heart 4-Hydroxynonenal (4-HNE) levels, and increased the activity of serum and heart superoxide dismutase (SOD), catalase (CAT), and the hippocampal SOD and CAT mRNA level. Quercetin-lycopene combination exhibited anti-inflammation effects by reducing inflammatory genes such as cyclooxygenase-2 (COX-2) and interleukin-1β (IL-1β). The heart and hippocampal mRNA level of nuclear factor erythroid 2-related factor 2 (Nrf2) expression was up-regulated, and the antioxidant genes related to Nrf2 including heme oxygenase-1 (HO-1), NAD(P)H Quinone Dehydrogenase 1 (NQO1) were elevated. Quercetin-lycopene combination significantly promoted the mRNA level of deacetylase sirtuin-1 (SIRT1), increased 3.3-fold and 3-fold SIRT1 expression in the heart and hippocampus, respectively. They could bind SIRT1 at the active site predicted by molecular docking . These results suggested that they may interact with SIRT1 to activate Nrf2, inhibit pro-inflammatory factors, and prevent oxidative stress in D-GAL-induced mice.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 10
·28247-28258
·
IF 5.19
Shi Guangyu,Hu Jiayuan,Cheng Yuanyuan,Shi Weilin,Chen Yan
The effect of Pseudomonas aeruginosa ( P. aeruginosa ) on the phytoremediation efficiency of ryegrass on soil contaminated with nonylphenol (NP) and cadmium (Cd) was investigated by pot experiments. Pseudomonas aeruginosa application stimulated the adsorption of Cd by ryegrass and facilitated the biodegradation of NP in the soil. Exogenous P. aeruginosa inoculation increased the activities of urease, dehydrogenase, and polyphenol oxidase in the soil of the T4 treatment by 38.5%, 50.0%, and 56.5% compared to that of the T2 treatment, respectively. There was a significant positive correlation between the activities of dehydrogenase and polyphenol oxidase and the NP removal rate ( P < 0.001). The relative abundances of beneficial microorganisms (such as Sphingomonas , Lysobacter , Streptomyces , Chloroflexia, Deltaproteobacteria, and Alphaproteobacteria) were increased as a result of P. aeruginosa inoculation. These microorganisms play important roles in nutrient cycling, Cd adsorption, and NP degradation. Additionally, P. aeruginosa was not the dominate bacterial species at the end of the experiment. According to this study, P. aeruginosa application improved the phytoremediation efficiency of ryegrass on soil contaminated with NP and Cd, with a minimal risk of alien microbial invasion.
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INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Xian-Xian Ji,Liu Yang,Yu-Long Liu,Ying Fu,Fei Ye
The synergistic effect of graphene and doping elements is vital to improve the electrocatalytic performance. However, it is still a challenge to select appropriate elements for doping to improve the rate of hydrogen evolution reaction (HER). In this study, we prepared a highly efficient and promising electrocatalyst, namely CoMoO 4 /Co 2 Mo 3 O 8 @C , by a carburization process of metal–organic frameworks (MOFs) combined with doping molybdenum via simple hydrothermal and pyrolysis method. Compared with Co-MOF , CoMoO 4 /Co 2 Mo 3 O 8 @C exhibited excellent electrocatalytic performance with an overpotential as low as 120 mV at 10 mA·cm −2 and a Tafel slope as small as 69 mV·dec −1 for HER activity in 0.5 M H 2 SO 4 . The excellent performance of CoMoO 4 /Co 2 Mo 3 O 8 @C could be ascribed to the synergistic effect of CoMoO 4 /Co 2 Mo 3 O 8 and graphene coating, which facilitated charge transfer in HER activity. This work may provide novel perspectives for fabricating electrocatalysts composed of transition metal oxide and graphene based on MOFs for enhancing HER performance.
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