CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1389-1396
·
IF 3.382
Zhuo Chen,Lvming Dong,Hanchuan Tang,Yan Yu,Lei Ye,Jianfeng Zang
One-dimensional all-inorganic halide perovskites have emerged as one of the most prominent materials in the application of optoelectronic devices due to their remarkable properties such as a low number of defects, morphological anisotropy, mechanical flexibility and fast charge transfer capability. Particularly, cubic (α) phase CsPbI3 has the narrowest band gap of 1.73 eV among all-inorganic lead halide perovskites, exhibiting the greatest potential in solar cell applications. However, the direct synthesis of room temperature stabilized α-CsPbI3 nanowires is challenging and remains unfulfilled because the synthesis reaction usually involves a phase change process, resulting in an undesired orthorhombic (δ) phase with a wider bandgap of 2.82 eV. Here, we report a low-temperature approach to directly synthesize highly stabilized α-CsPbI3 nanowires. Low reaction temperature, capping ligand protection, and extended growth time are employed to successfully grow α-CsPbI3 nanowires. The as-synthesized α-CsPbI3 nanowires are 10–20 μm in length and 5–80 nm in diameter. The X-ray diffraction (XRD), photoluminescence (PL), and UV-vis absorption results verify that these cubic phase nanowires maintain excellent stability at room temperature for 90 days. The CsPbI3 nanowires show a PL peak located at around 685 nm and the UV-vis absorption spectrum further reveals that the band gap is about 1.77 eV. The excellent optical properties of the phase-stable CsPbI3 nanowires offer great potential in the field of optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 3
·303
·
IF 3.52
Yaodan Wang,Hongyan Pan,Qian Lin,Yongyong Shi,Jiesong Zhang
Hydrogen peroxide (H2O2), as a clean and green oxidant, is widely used in many fields. The direct synthesis of H2O2(DSHP) from H2and O2has attracted most research interest because it relates to a facile, environmentally friendly, and economic process. Yolk–shell Pd-M@HCS (hollow carbon sphere) (M = Co, Ni, Cu) nanocatalysts, in which the bimetal nanoparticle is the core and porous carbon works as the shell layer, are reported in this work. It was found that catalytic activities were enhanced because of the introduced M metals. Additionally, the different mass ratios of Pd to Co (mPd/mCo) were further investigated to improve the catalytic performance for the DSHP. When mPd/mCo was 4.4, the prepared Pd-Co@HCS-(4.4) catalyst, with an average Pd nanoparticle size of 7.30 nm, provided the highest H2O2selectivity of 87% and H2O2productivity of 1996 mmolgPd−1·h−1, which were increased by 24% and 253%, respectively, compared to Pd@HCS.Keywords:direct synthesis of hydrogen peroxide;Pd-based catalyst;yolk–shell structure
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Jiahao Wang,Qiliang Gao,Chao Li,Junfeng Zhang,Qingde Zhang,Yizhuo Han
Direct conversion of methanol and acetic acid (HAc) into acrylic acid (AA) and methyl acrylate (MA) is remarkably significant for the high-value utilization of coal-based chemicals. However, the previous catalysts, due to their single function or poor synergy between multiple active sites, remain large challenges in direct synthesis of acrylic acid. Herein, we designed a novel catalyst system through coating TiO 2 to sodium superionic conductor (NASICON) substrate for direct synthesis of acrylic acid from methanol and acetic acid. It was revealed that the catalyst with TiO 2 coating showed obviously improved performance. The selectivity of AA+MA highly reached 56.1 % at 380 °C, corresponding to the spatiotemporal yield of 46.5 μmol·g −1 ·min −1 . It was demonstrated that TiO 2 coating catalyzes the oxidative dehydrogenation of methanol to formaldehyde, while NASICON substrate exerts important effects on the aldol condensation of formaldehyde and acetic acid, and their effective synergy promotes the direct synthesis of acrylic acid.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Jiateng Wang,Yunqing Zhuang,Bingxue Yu,Xiaofeng Wang,Gehua Bi,Xin Huang,Weimin Zhang
A general and efficient method for the synthesis of 4-sulfenylated oxazoles is described. Trisubstituted oxazoles are obtained in good to excellent yields from β-keto sulfoxides and nitriles. The mechanistic study suggests that the reaction proceeds via the nucleophilic addition of nitriles to the in situ formed α-carbonyl cation followed by intramolecular cyclization.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Wei Dang,Linna Zhao,Fuping Li,Chenxi Li,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Yufei Tang
C/SiC aerogels with both ultra-low thermal conductivity and extremely high strength were fabricated by freeze casting. SiC junctions originated from pyrolysis of polycarbosilane (PCS) were formed between carbon nanofibers (C f ) to enhance the strength of aerogels. The effects of PCS content and total solid content on the phase composition, pore structure , thermal conductivity and compressive property were studied. The fabricated aerogels possess hierarchical pore structure. In the micro-scale, it contains circular pores with size of about 15 µm, while it is mesoporous and macroporous in the nano-scale. Both thermal conductivity and compressive strength increase with the increase in PCS content. Through tailoring PCS content and total solid content, C f /SiC aerogels with porosity of 99.5%, thermal conductivity of 33 mW·m −1 ·K −1 and compressive strength of 7.14 MPa can be obtained. The specific strength of the fabricated C f /SiC aerogels is up to 467.6 MPa/(g/cm 3 ), which is the highest value for ceramic aerogels.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Huiyun Zou,Jianyang Li,Jingjing Li,Xiaorong Shangguan,Tianle Wu,Qi Li,Zhongyi Wang,Hui Zhang,Yanyu Guan,Feng Liu,Xuewen Li
The global dissemination of antibiotic resistance genes (ARGs) via plasmid-mediated conjugation poses a critical threat to public health. Polycyclic aromatic hydrocarbons (PAHs) are persistent environmental contaminants, but their impacts on ARGs transmission remain unclear. This study investigated how PAHs types and concentrations modulate ARGs conjugation in Escherichia coli . Results demonstrate concentration-dependent dual effects: environmental concentrations of parent PAHs (naphthalene, fluorene) and fluorene derivatives (dibenzothiophene, dibenzofuran, carbazole, nitrofluorene) significantly enhanced conjugation frequencies, whereas phenanthrene inhibited conjugation and pyrene exhibited no effect. Naphthalene, fluorene and fluorene derivatives promoted generation of intracellular reactive oxygen species, increased outer membrane permeability via reduced lipopolysaccharides synthesis, and decreased hydrophobic chain interactions. These PAHs increased proteins synthesis and secretion among extracellular polymeric substances and intercellular adhesion, positively correlated with conjugation frequency. We firstly found that these PAHs promoted energetic activation through tricarboxylic acid cycle upregulation, which enhances electron transfer chain activity to boost proton motive force and elevate intracellular ATP levels. Furthermore, downregulation of global regulatory genes ( korA, korB ) coupled with upregulation of mating pair formation genes ( trbB, trbC, trbJ ), facilitating plasmid transfer/replication and mating bridge assembly. This work reveals PAHs-triggered mechanisms associated with plasmid conjugation and underscores the risk posed by PAHs pollution in ARGs dissemination.
研究领域:
环境科学
·
微生物学
·
分子生物学
·
遗传学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 27
·13315-13324
·
IF 3.925
Yongyong Shi,Donghai Jiang,Jingyun Zhao,Lang Wu,Chenchen Zhao,Jun Ma,Hongyan Pan,Qian Lin
PdMulti@HCS catalysts with Pd nanoparticles partially embedded in the inner wall of hollow carbon spheres were synthesized by a hard template method. The synthesis process of PdMulti@HCS catalysts and the influence of the pore structure of the hollow carbon shell on the catalytic performance for the direct synthesis of H2O2 from H2 and O2 were systematically researched in this work. When the mass ratio of resorcinol (R) and formaldehyde (F) was R/F = 0.20 g/0.286 g, the mass of CTAB was 2.0 g, and the additional amount of 0.075 M H2PdCl4 solution was 1.0 ml; Pd nanoparticles obtained by in situ reduction using freshly prepared NaBH4 solution with an average size of 6.7 nm showed good dispersion and partial embedding in the inner wall of the hollow carbon shell. The average size of cavity diameter and the hollow carbon shell thickness were 145 nm and 8.03 nm, respectively. More importantly, there were a large number of micropores with a pore size distribution of 1.5 nm in the hollow carbon shell. This special hollow structure ensured the maximum exposure of Pd active sites and the optimal transfer and diffusion ability, which were conducive to improving the catalytic activity and stability of the PdMulti@HCS catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Ran Wang,Yanting Liu,Guangyi Li,Aiqin Wang,Xiaodong Wang,Yu Cong,Tao Zhang,Ning Li
Methylcyclopentadiene (MCPD) is a widely utilized intermediate in the synthesis of advanced aviation fuels and valuable chemicals. However, the low yield from fossil energy and the high price of MCPD greatly limit its application on a large scale. To fulfill the increasing market demand of MCPD, it is imperative to explore efficient and integrated technologies for the production of renewable MCPD from low cost and more available biomass. In this work, Zn3Mo2O9 was obtained via a simple precipitation method and demonstrated excellent catalytic performance for the direct synthesis of MCPD with 2,5-hexanedione (HD), a platform compound that can be directly produced by the selective hydrogenolysis of cellulose. Over it, a good molar yield of MCPD (65%) was obtained by the cascade intramolecular aldol condensation/selective hydrodeoxygenation reaction at 400 °C under atmospheric pressure. On the basis of the characterization results, the Zn3Mo2O9 catalyst has a higher specific BET surface area than the rest of the catalysts, which are favorable for the adsorption and mass transfer of the reactant. Meanwhile, the Zn3Mo2O9 catalyst also has relatively higher reducibility that will lead to the emergence of more oxygen vacancies (or Mo5+ species) under the investigated conditions. All of these characteristics lead to higher activity, better selectivity, and good stability of the Zn3Mo2O9 catalyst in the direct conversion of HD to MCPD. Because of its excellent hydrodeoxygenation performance, the Zn3Mo2O9 catalyst can also be used as the catalyst for the direct production of renewable dienes with other biomass-derived α,β-unsaturated ketones.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zaiyong Yang,Zengxi Wei,Shunxin Zhou,Bo Bao,Shuangliang Zhao,Fuzhong Gong
Direct synthesis of hydrogen peroxide (H 2 O 2 ) from hydrogen and oxygen (DSHP) represents a promising alternative route to the current widely used anthraquinone process, as the latter has been much criticized for not-environmentally friendly issue. However, most DHSP reaction systems encounter with the challenge of explosion risk and low-selective for production of H 2 O 2 . Herein, we report a new continuous DSHP process by constructing a feasible microreactor upon microfluidic chip under ambient condition. By examining the effects of temperature, liquid flow rate, gas flow rate, H 2 /O 2 ratio and solvent species on the production rate of H 2 O 2 , we demonstrated that the methanol is the most favorable solvent for promoting the DSHP process, and further identified the optimal reaction condition under which continuous production of H 2 O 2 with the concentration of 0.388 wt% is achieved. Additionally, the DFT calculations were performed, which unraveled the solvent effect and showed that the methanol molecule can efficiently stabilize the O 2 molecule and co-catalyze the DSHP reaction. Finally, the economic analysis of the proposed process is carried and compared with the commercial ones. This work provides a promising on-site route to produce H 2 O 2 in a green, safe yet ready-to-use process.
研究领域:
化学工程
·
催化
·
微流控
·
环境化学
✓ 已验证
DOI
高影响因子
BRAZILIAN JOURNAL OF MICROBIOLOGY
·
2023
·Vol. 54
·期 4
·2597-2602
·
IF 2.2
Zhang Meijie,Song Ge,Zheng Hailin,Pathakumari Balaji,Liu Weida,Liang Guanzhao
Purpose Since systematic antifungals for mucormycosis showed variable MICs depending on strains, effective and safe antifungal therapy was still needed. This study is aimed to evaluate the in vitro activity of doxycycline combined with antifungal therapy against dominant Mucorales pathogens. Methods Multidrug susceptibility testing was performed with doxycycline and antifungals, including itraconazole, posaconazole, and amphotericin, in 21 isolates of 8 dominant Mucorales pathogens. Results The fractional inhibitory concentration index according to M38 showed one Rhizopus arrhizus isolate synergic ( ∑ FICI = 0.375) and other isolates in addition (0.5 < ∑ FICI < 4). Conclusions Doxycycline was found to have in vitro advantages in combined antifungal treatment over antifungals alone.
研究领域:
医学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wenhan Wang,Wenqiang Li,Zijian Wang,Bo Liu,Bing Wang,Jingui Duan,Rongfei Zhou
Carbon dioxide capture is an effective method to mitigate climate change . Highly CO 2 -selective and highly moisture-resistant absorbent is essential for energy-efficient carbon capture by absorption. Herein, a highly CO 2 -selective and high-silica CHA zeolite in a pure lithium form (Li-SSZ-13) was synthesized using a direct synthesis method for the first time. The effects of gel n (SiO 2 )/ n (Al 2 O 3 ) ratio, gel n (SiO 2 )/ n (Li 2 O) ratio and synthesis time on the crystallinity , yield, micropore volume and CO 2 loading of the crystals were systematically investigated. The adsorption isotherms of CO 2 and N 2 were measured for directly synthesized Li-SSZ-13, conventional Na-SSZ-13 and ion-exchanged Li-Na-SSZ-13 zeolites. The dynamic breakthrough adsorption properties were measured for Li-SSZ-13 in comparison with Na-SSZ-13 and Li-Na-SSZ-13. The obtained Li-SSZ-13 exhibited a high CO 2 adsorption capacity of 4.48 mmol/g and a high CO 2 /N 2 IAST selectivity of 310 at 100 kPa and 273 K, which were 45.0 % and 441 % higher than Na-SSZ-13 zeolite, 24.8 % and 179 % higher than Li-Na-SSZ-13 zeolite, respectively. It suggests that directly synthesized Li-SSZ-13 zeolite has great potential for efficient CO 2 capture from flue gas .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Frontiers in Microbiology
·
2025
·
IF 4.5
Zhuocheng Yao,Yuhan Yang,Yanchun Gong,Shiyi Shi,Yunying Ge,Weiliang Zeng,Deyi Zhao,Jianming Cao,Tieli Zhou,Mo Shen
Disinfectants are commonly utilized by humans to combat microorganisms. However, residual disinfectants may promote environmental antimicrobial resistance by facilitating horizontal gene transfer (HGT) of antibiotic resistance genes. Bronopol is a routinely used disinfectant that persists in the environment, and previous studies have concentrated on its ecotoxicity rather than its implications on the propagation of resistance genes. This study aimed to establish an in vitro conjugation model to investigate whether bronopol promotes the transfer of antibiotic resistance genes (ARGs) via plasmid conjugation. Using Escherichia coli DH5α and DC8855 as donors harboring RP4-7 and blaNDM-4-positive IncFII(K) plasmids, respectively, and J53 as the recipient strain, we found that sub-inhibitory concentrations of bronopol (2 μg/L and 20 μg/L) significantly increased the conjugative transfer frequency (CTF) of both plasmids. Mechanistic analysis revealed that bronopol enhanced bacterial membrane permeability, as demonstrated by propidium iodide (PI) staining, 1-N-phenylnaphthylamine (NPN) fluorescent probes, transmission electron microscopy (TEM), and upregulation of the outer membrane protein gene ompC. Additionally, bronopol treatment upregulated RP4 plasmid-encoded genes involved in DNA transfer/replication (trfAp) and the global regulator of HGT (kilA/kilB). These findings highlight a previously unrecognized role of bronopol in facilitating the dissemination of antibiotic resistance genes, particularly those of clinical significance.
研究领域:
微生物学
·
环境科学
·
遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）