CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 7
·2100245
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IF 1.599
Yihua Pan,Shoulei Xu,Siyao Li,Daini Wang,Yuhua Yang,Wenxia Wu,Bernard A. Goodman,Shengdi Ta,Wen Deng
Blue, green, and red emissions through upconversion and energy transfer processes are investigated as a function of the Tm 3+ concentration in Tm/Er/Yb triply doped yttria stabilized zirconia (YSZ) crystals upon excitation at 980 nm. YSZ doped with 0.075–0.250 mol% Tm 2 O 3 , 1.50 mol% Er 2 O 3 , and 2.00 mol% Yb 2 O 3 are prepared by the optical floating zone method, and confirmed to be in the cubic phase by X-ray diffraction. The blue emission corresponds to the Tm 3+ 1 G 4 → 3 H 6 transition, and is produced through a three-photon process, whereas the green and red light are emitted through two-photon processes from the Er 3+ 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions for green and the Er 3+ 4 F 9/2 →4I 15/2 transition for red. However, interactions between the different lanthanide ions is a factor in determining the overall color of these triply doped crystals, and this is not simply a summation of the results from the singly doped systems, so this mechanism of energy transfer is discussed in detail. The CIE color chromaticity coordinates for the present samples under excitation at 980 nm approach (0.39, 0.55), which is in the yellow-green region.
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JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Yi Liu,Ying Chen,Yunli Liu,Zewen Chen,Huan Yang,Zhongxiao Yue,Qing Fang,Yunfei Zhi,Shaoyun Shan
Solar energy is considered as the cleanest, cheapest, and most sustainable energy source, and CO 2 cycloaddition that is drove by solar energy has unique advantages in the aspect of energy and environmental. Therefore, Zn and N co-doped porous carbon nanosheets (ZNCs), which were synthesized by a simple one-step pyrolysis method, as catalysts and photothermal material to photothermally drive cycloaddition of CO 2 . The prepared ZNCs show graphene-like layered structure, uniformly distributed Lewis acid (Zn atoms) sites and Lewis base (N atoms) sites, full spectrum absorption and high photothermal conversion efficiency. More importantly, ZNCs have a higher catalytic efficiency than traditional heating methods because it can be quickly in-situ heated by light, hence the yield of cyclic carbonate reached 91.1% (0.1 MPa CO 2 , 1000 mW·cm −2 full-spectrum irradiation, 12 h). ZNCs were recycled five times without significant reduction in catalytic efficiency, and have high activity to other series of epoxides. A possible CO 2 cycloaddition mechanism which is catalyzed by ZNCs is proposed, including the step of adsorption, ring opening, insertion and cyclic carbonates formation.
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ADVANCED MATERIALS
·
2022
·Vol. 34
·期 21
·2202168
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IF 32.086
Junli Meng,Peisen Zhang,Qizhe Chen,Zihua Wang,Yuan Gu,Jie Ma,Wang Li,Chen Yang,Yuanyuan Qiao,Yi Hou,Lihong Jing,Yong Wang,Zi Gu,Lichong Zhu,Haozhen Xu,Xueguang Lu,Mingyuan Gao
Nanovaccines have emerged as promising alternatives or complements to conventional cancer treatments. Despite the progresses, specific co-delivery of antigen and adjuvant to their corresponding intracellular destinations for maximizing the activation of antitumor immune responses remains a challenge. Herein, a lipid-coated iron oxide nanoparticle is delivered as nanovaccine (IONP-C/O@LP) that can co-deliver peptide antigen and adjuvant (CpG DNA) into cytosol and lysosomes of dendritic cells (DCs) through both membrane fusion and endosome-mediated endocytosis. Such two-pronged cellular uptake pattern enables IONP-C/O@LP to synergistically activate immature DCs. Iron oxide nanoparticle also exhibits adjuvant effects by generating intracellular reactive oxygen species, which further promotes DC maturation. IONP-C/O@LP accumulated in the DCs of draining lymph nodes effectively increases the antigen-specific T cells in both tumor and spleen, inhibits tumor growth, and improves animal survival. Moreover, it is demonstrated that this nanovaccine is a general platform of delivering clinically relevant peptide antigens derived from human papilloma virus 16 to trigger antigen-specific immune responses in vivo.
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 19
·3705-3715
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IF 7.571
Shun Yang,Yingqi Ji,Fanyan Deng,Xiaojiang Sun,Congqin Ning
As a biocompatible material with rich resources and economic benefits, montmorillonite (MMT) has been widely used in the antibacterial field as a drug carrier and toxin adsorbent. In addition, the distinctive structure of MMT provides a possibility to tune its property in a wide range through ion-exchange. In this study, Co-montmorillonite (CoMMT) was prepared by the ion-exchanging method in a Co(NO3)2 solution and its antibacterial activity and cytocompatibility were investigated. The results showed that Co was introduced into MMT successfully and led to an increase in the interlayer spacing of MMT. Also, CoMMT showed a morphology of irregular aggregates consisting of stacked and intertwined lamellae with a uniform cobalt distribution. Besides, CoMMT had better dispersity and higher specific surface area than unmodified MMT. The antibacterial test results showed that CoMMT had good antibacterial activity against S. aureus and E. coli when the CoMMT concentration was higher than 0.2 mg mL−1 and 0.4 mg mL−1, respectively. The possible antibacterial mechanism of CoMMT was speculated and verified by a combination of SEM and EDS results. In addition, CoMMT showed no obvious cytotoxicity to MC3TC-E1 at the observed antibacterial concentration. These findings demonstrated that CoMMT with good biocompatibility and antibacterial activity could be used as a novel antibacterial agent for tissue engineering.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2022
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IF 4.52
Shu-Hua He,Hong Jiang
Based on the results of qualitative analysis, a simple and accurate acidity-controlled absorption spectroscopy method for the determination of certain coexisting pigments in commercial candies is established. Using a Tris−HCl (pH 3.6) reaction medium, brilliant blue (BRI) and tartrazine (TAR) react with malachite green (MAG); tartrazine and sunset yellow (SUN) react with brilliant green (BRG); and curcumin (CUR) and sunset yellow react with crystal violet (CRY). They all form binary ion association complexes. Their linear range are 0.06–21.4 mg/L (BRI-MAG, 628 nm), 0.06–11.8 mg/L (TAR-MAG, 436 nm), 0.04–11.8 mg/L (TAR-BRG, 425 nm), 0.04–9.1 mg/L (SUN-BRG, 502 nm), 0.03–10.0 mg/L (SUN-CRY, 484 nm), and 0.03–11.1 mg /L (CUR-CRY, 390 nm), respectively. The detection limit and quantification limit of each system are 0.041 mg/L and 0.71 mg/kg (MAG system), 0.035 mg/L and 0.61 mg/kg (BRG system), and 0.030 mg/L and 0.52 mg/kg (CRY violet system), respectively. This method is simple, rapid, accurate, sensitive and selective. The coexisting pigments curcumin, tartrazine, sunset yellow, and brilliant blue can be determined without pigment separation and complex mathematical model. It has been used in the determination of actual candies with satisfactory results.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2627-2640
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IF 3.134
Wang Guangying,Liang Yan,Song Jian,Xu Kui,Pan Youchun,Xu Xiaolong,Zhao Yu
Co-doped MnCeO x /ZrO 2 catalysts were synthesized by impregnation method and their low temperature deNOx performance were evaluated. The physicochemical properties of the catalysts were studied. The results showed that the doped Co could promote the deNOx performance of MnCeO x /ZrO 2 significantly, and the doped catalyst with the Co/Mn molar ratio of 1:2 possessed the best catalytic performance. Compared with pure MnCeO x /ZrO 2 catalyst, the deNOx efficiency of the optimal 1Co 2 MnCeO x /ZrO 2 was higher to 93% at 100 °C, improved nearly by 17%. The complete removal of NO was achieved at the temperature range of 120–250 °C. The promoted catalytic performance of Co-doped MnCeO x /ZrO 2 catalyst was mainly attributed to the improvement of the catalyst support structure and surface acidity by Co. The catalytic reaction of NO with NH 3 over 1Co2MnCeO x /ZrO 2 catalyst follows both Eley–Rideal mechanism and Langmiur–Hinshelwood mechanism.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhengfei Yang,Xinyong Zhou,Yongqi Yin,Huaiguo Xue,Weiming Fang
Low-dimensional (LD) materials show great potential in sensing applications due to their attractive properties. Herein, Co@N-doped carbon nanorods (CoN-CRs) were prepared via the pyrolysis of a rod-like Co-ZIF-L precursor, which was synthesized using polyvinylpyrrolidone (PVP). The fabricated CoN-CRs were characterized by a series of techniques, and their electrochemical sensing behavior towards nitrite was subsequently evaluated. Compared with Co@N-doped carbon sheets (CoN-CSs), CoN-CRs exhibited enhanced performance for nitrite detection due to their higher surface area and more accessible active sites. Under optimized conditions, the CoN-CRs-based sensor was able to determine nitrite concentration in two linear ranges (0.5–4000 and 4000–8000 μM), with corresponding sensitivity values of 1.03 μA μM −1 cm −2 and 0.82 μA μM −1 cm −2 , respectively, and a detection limit of 0.17 μM. Moreover, this sensor exhibited good selectivity, stability and reproducibility, and provided satisfactory feasibility for the analysis of nitrite in sausage samples and tap water. This work demonstrates that CoN-CRs are promising sensing materials for nitrite monitoring.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1744-1752
·
IF 3.146
Li Feifei,Dong Jiale,Wang Mingyue,Lin Xingtao,Cai Weijie,Liu Xianyun
This work is mainly concerned with the synthesis of Co-Zn nanocomposites by employing MCM-41 silica as hard template (CoZnO-HT) and its catalytic behavior toward to CO 2 reforming with ethanol. The physicochemical features of the as-prepared catalysts were probed through various characterization techniques, including XRD, TEM, BET, H 2 -TPR, and XPS. Indeed, CoZnO-HT catalyst possessed a highly ordered mesostructure with similarity to MCM-41 template and a higher specific surface area (304 m 2 /g) compared to the reference CoZnO-C sample (4.75 m 2 /g) prepared by the conventional impregnation method. Consequently, CoZnO-HT exhibited good performance at low temperature, and full ethanol conversion could be achieved at 550 °C as well as the negligible formation of byproduct acetone. In addition, this catalyst depicted good stability and no obvious deactivation was observed after 40 h time on stream tests under the stoichiometric feed ratio. Indeed, superior specific surface area and efficient mass transport within the mesopores might be critical factors assigned to better activity and stability for CoZnO-HT.
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LANGMUIR
·
2022
·
IF 4.331
Junjie Si,Shuai Zhang,Xiuming Liu,Kuanjun Fang
Reactive dyes are widely used in textile industry, but their excessive use has caused several water pollution problems. In order to reasonably treat printing and dyeing wastewater, the highly efficient adsorbent for reactive dyes employed in this study is a new type metal–organic framework (MOF) material. Ni/Co MOF (NCM) was synthesized using the solvothermal method; then, the materials were analyzed by a series of characterization methods. This study mainly investigated the adsorption properties of NCM toward reactive dyes, and the adsorption capacities of NCM toward reactive red 218 were up to 200 mg·g–1. The results were found to conform to the Langmuir isotherm model, and the pseudo-second-order kinetic model by performing kinetic and isotherm studies on the adsorption process of reactive red 218 on NCM. The results of the intraparticle diffusion model suggest that the binding of reactive red 218 to NCM was mainly divided into three steps: adsorption, diffusion, and saturation. Moreover, it was concluded by thermodynamic fitting of the adsorption process that the adsorption of reactive red 218 by NCM proceeded spontaneously and was accompanied by an endothermic reaction, in which the adsorption of both occurred mainly by electrostatic attraction. The NCM has good reusability and still has good adsorption performance after being reused 5 times. Therefore, NCM is a very promising and excellent adsorbent for the treatment of dye wastewater because of its high efficiency and reusability.
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FUEL
·
2022
·
IF 8.035
Junjie Weng,Zhanjun Cheng,Yi Zhang,Chao Jiang,Lin Long,Jian Wang,Jianfeng Pan
The co-utilization of hydrogen-rich plastic and biomass can upgrade bio-oil. This process was further developed by adding catalysts to the co-pyrolysis of biomass and plastic. In this work, thermal and catalytic co-pyrolysis of hemicellulose and polypropylene (PP) was investigated by TG combined with mass spectrometry, which is characterized by in-situ online detection for pyrolysis products. The intrinsic interaction as well as the reaction mechanism were revealed for the catalytic co-pyrolysis. The results show that CaO catalyst can enhance xylan decomposition and increase the production of small alkene from PP. The formation of olefins and furan compounds can be promoted significantly by CaO catalyst. Besides hydrocarbon pool mechanism, Diels-Alder reaction further contributes to additional aromatics formation. This work provides detailed reaction information, which can help to further understand the mechanism of catalytic co-pyrolysis of biomass and plastic.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guotai Zhang,Chunxi Hai,Yuan Zhou,Weiping Tang,Jingze Zhang,Jinbo Zeng,Yanhua Liu,Shengde Dong,Guiping Peng
A surge of interest has been attracted by Li 1.6 Mn 1.6 O 4 -type adsorbent for collecting lithium resources from salt-lake brines due to its excellent selectivity, high theorical adsorption capacity up to 72. 3 mg g −1 and low cost. However, its large-scale practical application is limited because of its bone element Mn dissolution during the cycled desorption process. Herein, F and Al co-modifying technique, an efficient method for stabilizing its spinel structure or forming protective coating, was employed to improve the application performances of Li 1.6 Mn 1.6 O 4 -type adsorbent prepared by sol–gel method. Based on the various characterization results, the co-modification not only leads to the formation of fluoride-rich coating and the substitution of Mn 3+ by Al 3+ , but also generates the active adsorbents with abundant nano-islands. DFT calculations revealed that the coating layer is indeed AlF 3 rather than LiF. In addition, in-situ high-temperature XRD tests demonstrates that the co-modification can significantly enhance the heat resistance and structural stability of the material. As-prepared adsorbent exhibits greatly improved Li adsorption capacity (increased from 28.5 to 33.7 mg g −1 ), lower Mn loss rate (decreased from 2.1 to 1.8%), enhanced cycling stability and good adsorption selectivity in the Qarhan brine containing Na + , K + , Ca 2+ , Mg 2+ , which is very significant and important for effectively removing lithium from low-grade brines.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Yang,Yawen Deng,Li Zhang,Yaru He,Shuai Zhao,Ting Xiao,Suihu Dang,Yunfeng Bai
Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were synthesized by the sol-gel method. Fluorescence intensity has been enhanced about 270 times under 980 nm laser excitation by combined laser annealing (90 times) and co-doped with Li + ions (3 times). The doping of Li + ions increased the asymmetry around Er 3+ , while laser annealing reduced surface defects . Fluorescence characteristics with the temperature of laser annealed Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were studied. An interesting phenomenon that the non-thermal coupling of I 563 /I 799 transformed into the thermal coupling as the temperature rises is found. The possible mechanisms were discussed, and fluorescence thermometry based on I 563 /I 799 showed higher temperature sensitivity than other reports. The effective fluorescence enhancement method and the new fluorescence thermometry energy levels can promote the application of rare earth fluorescent materials.
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