Journal of CO2 Utilization
·
2017
·
IF 4.292
Adriano Zanon,Somboon Chaemchuen,Bibimaryam Mousavi,Francis Verpoort
A newly Zn-doped ZIF-67 has been synthesized in water at room temperature for the first time without the aid of any organic solvent. The textural and physical properties of the material were analyzed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), N 2 adsorption-desorption, scanning electron microscopy (SEM) and ICP-AES. The catalyst showed quantitative conversions and selectivity for the synthesis of cyclic carbonates starting from epoxides and carbon dioxide. Compared with different reported MOFs as heterogeneous catalysts used for the cycloaddition of carbon dioxide to epoxides, this catalyst outperforms all the reported ones till now. The coupling reaction was studied at different pressures and temperatures applying different epoxide substrates. Additionally, no co-catalyst and solvent were required to obtain excellent conversions. The heterogeneous nature of the catalyst was maintained at least up to four catalytic cycles with a slight loss of activity.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xingguo Zhou,Hanghang Liu,Yanhui Zheng,Yaobao Han,Tingting Wang,Hao Zhang,Qiao Sun,Zhen Li
Radiotherapy has been extensively used to treat cancer patients because it can effectively damage most solid tumors without penetration limits. A hypoxic microenvironment in solid tumors leads to severe radioresistance and expression of hypoxic inducible factor-1 (HIF-1), which results in poor efficacy of radiotherapy alone. Herein, we report the excellent efficacy of radiotherapy achieved using a new type of yolk–shell Cu2–xSe@PtSe (CSP) nanosensitizer functionalized with the HIF-1α inhibitor acriflavine (ACF). We prepare the CSP nanosensitizer through the interfacial redox reactions between chloroplatinic acid and Cu2–xSe nanoparticles (CS) and then functionalize the nanosensitizer with ACF through their electrostatic interactions. We show that the synthesized CSP nanosensitizer can arrest the cell cycle (i.e., at the gap 2/mitosis (G2/M) phases) of tumor cells to enhance their sensitivity to X-rays and decompose endogenous H2O2 into O2 to reduce hypoxia and increase the production of reactive oxygen species, which leads to severe damage to DNA double strands and apoptosis of tumor cells. We also show that the ACF on the surface of CSP nanoparticles can effectively reduce the expression of HIF-1α. All these effects lead to a low vascular endothelial growth factor, low density of microvessels in tumor, decreased cell proliferation, and increased cell apoptosis, which synergistically and drastically enhance the efficacy of radiotherapy. This work provides insights and guidance for developing novel nanosensitizers to enhance the efficacy of radiotherapy.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xudong Wang,Ke Chen,Ziqian Li,Haoming Ding,Yujie Song,Shiyu Du,Zhifang Chai,Hui Gu,Qing Huang
Herein, a series of chalcogen-containing MAX phases, Hf 2 (Se x S 1−x )C, were successfully synthesized, whose lattice parameter change follows the Vegard’s law. The average coefficient of thermal expansion (CTE) can be continuously tuned from 7.59 μK −1 to 9.93 μK −1 when the occupancy rate x of Se changes from 0 to 1. The substitution of Se for S effectively soften the crystal structures that is reflected by long average M-A bond in Se-alloying Hf 2 (Se x S 1−x )C. However, the CTEs along a and c axes in all Hf 2 (Se x S 1−x )C MAX phases are almost same which may be find application in thermal barrier coating (TBC) that isotropic volume change is highly demanding.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 16
·13496-13502
·
IF 2.22
Fang Weishuang,Ao Laiyuan,Tang Ying,Li Jie,Xiang Huaicheng,Zhang Zhiwei,Du Qianbiao,Fang Liang
Recently, there have been considerable interests in the Li-containing spinel oxides as promising microwave dielectric materials. Li loss at elevated temperatures, however, is known to be inevitable, resulting in deterioration on dielectric performances. Here the influence of Li nonstoichiometry on the microwave dielectric properties of Li 2 ZnGe 3 O 8 , a spinel oxide, was reported. An appropriate level of Li excess enhanced the densification of Li 2 ZnGe 3 O 8 and increased dielectric performances. In contrast, high level of Li excess induced the formation of the secondary phase of Li 2 ZnGeO 4 confirmed by XRD and Raman spectra, which in turn lowered the dielectric properties. Typically, a composition with x = 0.075, in the Li 2(1+ x ) ZnGe 3 O 8 ceramics exhibited the enhanced microwave dielectric properties with ε r = 10.68, Q × f = 77,300 GHz (at 13.3 GHz), and τ f = − 70.35 ppm/°C when sintered at 940 °C for 4 h. Moreover, these compounds have well chemical compatibility with the silver electrodes.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Fangyi Pei,Zhimiao Wang,Jianhua Lv,Fang Li,Wei Xue
Cu–Zn–Al catalyst was prepared by the co-precipitation method, and the catalytic performance for transfer hydrogenation of acetophenone (AP) to 1-phenylethanol (1-PhE) was evaluated using isopropanol (IPA) as a hydrogen source. The addition of Zn changed the morphology of the catalyst and reduced aggregation of catalyst particles, resulting in highly dispersed Cu active sites. As the Zn content increased, the valence state of Cu species changed. When the Cu/Zn molar ratio was 2/3, the Cu+/Cu0 ratio in the catalyst was 0.81, resulting in good selectivity for 1-PhE. The reaction conditions were optimized over the Cu–Zn–Al catalyst with a Cu/Zn molar ratio of 2/3. When the reaction was performed at 180 °C for 2 h with an IPA/AP molar ratio of 15, the AP conversion was 89.4% and the 1-PhE selectivity was 93.2%. The Cu–Zn–Al catalyst showed good stability, and AP conversion and the 1-PhE selectivity were essentially unchanged after five cycles.
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KEY ENGINEERING MATERIALS
·
2013
·
IF 0
Yun Xia Jiang,Hu Jin Zuo,Yong Jia Shen,Feng Ping Yi
The Friedel-Crafts acylation reaction between 5-cyanoindole and 4-chlorobutyryl chloride was conducted in ionic liquid 1-buty-3-methylimidazolium chloroaluminate ([bmiCl/AlCl3), the major product was 5-cyano-3-(4-chlorobuty) indole. The structure of the product was characterized by Mass and 1H NMR spectra. When the molar ratio of AlCl3 to [bmiCl in [bmiCl/AlCl3 is at 1:1 or less, no 5-cyano-3-(4-chlorobuty) indole could be obtained. The suitable molar ratios of AlCl3 to [bmiCl in [bmiCl/AlCl3 were from 2:1 to 3:1, the yields of the major product were from 68% to 70%, respectively. When the molar ratio of [bmiCl/AlCl3 to 5-cyanoindole was less than 2:1, the acylation reaction was difficult to carry out, because 5-cyanoindole would be not totally dissolve in [bmiCl/AlCl3 under the situation.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Liqing Li,Luo Feng,Yu Xiao,Wenqi Xie,Xiaoqi Sun
In this work, a new type of near-infrared (NIR) reflective yellow pigment with a general formula of [(Li0.4RE0.6Al0.6)x/2Bi1–x][MoxV1–x]O4 was prepared by a solid-phase reaction calcined at a high temperature of 700 °C. X-ray diffraction (XRD), scanning electron microscope (SEM), a UV–vis–NIR spectrophotometer, and other methods were used to characterize the structure, morphology, and optical properties of synthetic pigments. For a series of [(Li0.4RE0.6Al0.6)x/2Bi1–x][MoxV1–x]O4 pigments, when x > 0.2, bismuth vanadate changes from the monoclinic phase (space group I2/b(15)) to the tetragonal scheelite phase (space group I41/a(88)). The structures of the pigments are all tetragonal scheelite phases, and the difference in their color rendering is mainly due to the differences between the valence band and the conduction band and the difference in the band gap caused by different rare earth elements. The NIR reflectance (R %) and NIR solar reflectance (R* %) of [(Li0.4La0.6Al0.6)0.1Bi0.8][Mo0.2V0.8]O4 pigments are 96.64 and 93.10% (b* = 77.13, C* = 77.6), respectively. In the acid and alkali resistance test, the color difference values ΔE* of the pigment before and after soaking are less than 5. Finally, the thermal infrared test of the synthetic pigments and commercial pigments on galvanized plates without or with TiO2 was performed. The experimental results show that the temperature difference between the synthetic pigment and commercial bismuth yellow can reach 11 °C. Therefore, it is believed that the synthetic pigment can reflect more heat radiation from sunlight and has better heat insulation performance. The synthetic pigment has higher reflectivity than the commercially available bismuth vanadate pigment, showing its application potential.
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iScience
·
2021
·
IF 5.458
Dejun Zeng,Liyong Yuan,Pengcheng Zhang,Lin Wang,Zijie Li,Youqun Wang,Yunhai Liu,Weiqun Shi
HKUST-1@CMC (HK@CMC) composites that show good acid and alkali resistance and radiation resistance were successfully synthesized by introducing carboxymethyl cellulose (CMC) onto the surface of HKUST-1 using a foaming strategy. For the first time, the composites were explored as efficient adsorbents for U(VI) trapping from aqueous solution, with encouraging results of large adsorption capacity, fast adsorption kinetics, and desirable selectivity toward U(VI) over a series of competing ions. More importantly, a hybrid derivative film was successfully prepared for the dynamic adsorption of U(VI). The results show that ∼90% U(VI) can be removed when 45 mg L −1 U(VI) was passed through the film one time, and the removal percentage is still more than 80% even after four adsorption-desorption cycles, ranking one of the most practical U(VI) scavengers. This work offers new clues for application of the Metal-organic-framework-based materials in the separation of radionuclides from wastewater.
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BIODEGRADATION
·
2018
·Vol. 29
·期 2
·129-140
·
IF 2.41
Mao Fei,Liu Xiaohong,Wu Kang,Zhou Chen,Si Youbin
Because of extensive sulfonamides application in aquaculture and animal husbandry and the consequent increase in sulfonamides discharged into the environment, strategies to remediate sulfonamide-contaminated environments are essential. In this study, the resistance of Shewanella oneidensis MR-1 and Shewanella sp. strain MR-4 to the sulfonamides sulfapyridine (SPY) and sulfamethoxazole (SMX) were determined, and sulfonamides degradation by these strains was assessed. Shewanella oneidensis MR-1 and Shewanella sp. strain MR-4 were resistant to SPY and SMX concentrations as high as 60 mg/L. After incubation for 5 days, 23.91 ± 1.80 and 23.43 ± 2.98% of SPY and 59.88 ± 1.23 and 63.89 ± 3.09% of SMX contained in the medium were degraded by S. oneidensis MR-1 and Shewanella sp. strain MR-4, respectively. The effects of the initial concentration of the sulfonamides and initial pH of the medium on biodegradation, and the degradation of different sulfonamides were assessed. The products were measured by LC–MS; with SPY as a substrate, 2-AP (2-aminopyridine) was the main stable metabolite, and with SMX as a substrate, 3A5MI (3-amino-5-methyl-isoxazole) was the main stable metabolite. The co-occurrence of 2-AP or 3A5MI and 4-aminobenzenesulfonic acid suggests that the initial step in the biodegradation of the two sulfonamides is S–N bond cleavage. These results suggest that S. oneidensis MR-1 and Shewanella sp. strain MR-4 are potential bacterial resources for biodegrading sulfonamides and therefore bioremediation of sulfonamide-polluted environments.
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Frontiers in Chemistry
·
2018
·
IF 4.155
Jiang Zi-Min,Xu Ting-Ting,Yan Cong-Cong,Ma Cai-Yun,Dai Shu-Ge
Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.
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GREEN CHEMISTRY
·
2016
·Vol. 18
·期 10
·3075-3081
·
IF 8.506
Dezhang Ren,Zhiyuan Song,Lu Li,Yunjie Liu,Fangming Jin,Zhibao Huo
A novel approach for the production of 2,5-hexanedione (HDN) and 3-methyl-2-cyclopenten-1-one (3-MCO) from 5-hydroxymethylfurfural (HMF) by water splitting with Zn is reported for the first time. The use of high temperature water (HTW) conditions is the key for the efficient conversion of HMF to HDN and 3-MCO. Parameters regarding the Zn amount, temperature and reaction time are optimized and HDN and 3-MCO are produced in 27.3% and 30.5% yields, respectively. The roles of HTW and ZnO obtained by oxidation of Zn in water for the conversion of HMF, together with intermediate structures, are discussed to understand the mechanism of the reaction.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Yong Yang,Qingyao Zhu,Mingjun Wang,Wenhui Guo,Xinjiang Li,Daochuan Zhang,Xiaohong Zhang
Feeding, molting, and detoxification are crucial physiological processes in insect development. The midgut plays a central role in food digestion and nutrient absorption. Damage to the midgut can significantly inhibit insect growth. The molting is regulated by hormones such as 20-hydroxyecdysone (20E). 20E activates downstream genes involved in chitin metabolism. These genes facilitate cuticle degradation and synthesis during the molting cycle. Polo-like kinase 1 (PLK1) is an essential regulator of cell cycle progression. Although it has been extensively studied in mammals, its function in insects remains poorly understand. In this study, we identified and characterized the LmPLK1 gene in Locusta migratoria, a major agricultural pest. RNA interference targeting LmPLK1 induced atrophy of midgut and gastric ceca, impaired cuticle formation, and disrupted molting by reducing 20E titer and the expression of molting-related genes. Supplementation with 20E partially rescued cuticle separation defects, highlighting the role of LmPLK1 in modulating 20E signaling. Additionally, the knockdown of LmPLK1 increased nymph susceptibility to malathion. These findings indicate that LmPLK1 is a promising RNAi target for pest control, providing a novel strategy for managing locust populations.
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高影响因子
危险品化学品经营许可证（带存储）