CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xianju Zhou,Shouchun Zhao,Jie Zhang,Guotao Xiang,Sha Jiang,Li Li,Yongjie Wang,Yanhong Li,Chuan Jing,Lu Yao,Hongmei Yang,Zhen Wang
As a new generation of luminous material , perovskite quantum dots (PQDs) possess many excellent properties. However, PQDs suffer from dramatic decrease of optical performance when affected by high temperature. In this paper, methamidine acetate (FA + ) and manganese divalent cation (Mn 2+ ) codoped CsPbCl 3 quantum dots (QDs) were synthesized. The introduced FA + and Mn 2+ were designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. By comparison with CsPbCl 3 :Mn 2+ QDs, the results show that the CsPbCl 3 :FA + ,Mn 2+ QDs improve the blue exciton luminescence by 15% and the red Mn 2+ ions luminescence by 37%. Furthermore, CsPbCl 3 :FA + ,Mn 2+ QDs demonstrate super thermal stability by maintaining 97% of Mn 2+ emission when the temperature is raised to 70 °C even after 6 thermal cycles. Simultaneously, the UV light and water stability of CsPbCl 3 :FA + ,Mn 2+ QDs have also been obviously enhanced. The powder of the coped PQDs have been fabricated into a white LED which exhibits Color Rendering Index (CRI) of 88.2 and Correlated Color Temperature (CCT) of 5745 K. It shows that CsPbCl 3 :FA + ,Mn 2+ QDs not only reduce the Pb 2+ ions toxicity problem but also boost the thermal stability and thermal cyclability, which may open up more possibilities for the applications in optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Zhuangzhuang Chen,Yuqing Ma,Ning Fang,Min Ge,Yuan Su,An Chen,Shuai Yu,Ting Cai
Crystallization is widely used for the isolation and purification of active pharmaceutical ingredients (APIs) in the final manufacturing stage. Bazedoxifene (BZD) acetate, classified as a third-generation selective estrogen receptor modulator, is employed in the treatment of postmenopausal osteoporosis. This work reports the equilibrium solubility data of BZD acetate in fifteen different mono-solvents, including methanol, ethanol, n -propanol, i -propanol, n -butanol, ethyl formate, methyl acetate, ethyl acetate, acetone, 2-butanone, cyclohexanone, tetrahydrofuran (THF), 2-methyltetrahydrofurane (2-MeTHF), 1,4-dioxane and acetonitrile (ACN), within the temperature range “ T = 283.15–323.15 K” under p = 0.1 MPa. The solubilities of BZD acetate in various solvents increase with increasing temperature. Among the alcoholic solvents, the solubility order is as follows: methanol > ethanol > n -propanol > n -butanol > i -propanol. In esters solvent, the solubility of BZD acetate decreases in the following order: methyl acetate > ethyl acetate > ethyl formate. For ketones solvent, the solubility decreases in the following order: cyclohexanone > acetone > 2-butanone. The maximum value of BZD acetate solubility was 0.011 mol·mol −1 in tetrahydrofuran at T = 323.15 K, but the least data was found in ethyl formate at 283.15 K. Four thermodynamic models, i.e., the Yaws model, modified Apelblat model, λ h model, and Wilson model were applied to fit the solubility data of BZD acetate in different solvents. Among them, the Wilson model represents the most accurate fitting outcomes. Finally, the thermodynamic functions of mixing (including enthalpy, entropy, and Gibbs energy) were calculated, and the results indicate a mixing process that is both spontaneous and driven by entropy. The solubility data, correlated models, and derived thermodynamic functions present essential thermodynamic fundamentals for the industrial production of BZD acetate crystallization, facilitating efficient separation and purification.
研究领域:
制药工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 11
·2505
·
IF 2.8
Bo Zhang,Lei Wu,Fei Li,Wuwan Xiong,Peiyu Yao,Yang Zhang,Xiang Li
The production of waste textiles has increased rapidly in the past two decades along with the rapid development of the economy, the majority of which has been either landfilled or incinerated, resulting in energy loss and environmental pollution. Microwave pyrolysis, which can transform heterogeneous and complex waste feedstocks into value-added products, is considered one of the most competitive technologies for processing waste textiles. However, achieving selective product formation during the microwave pyrolysis of waste textiles remains a significant challenge. Herein, sodium acetate, potassium acetate, and nickel acetate were introduced into waste textiles through an impregnation method as raw materials to improve the pyrolysis efficiency. The optimized process parameters indicated that nickel acetate had the most favorable promotional effect of the three acetates. Notably, the waste textiles containing 1.0% Ni exhibited the highest gas production rate, with the hydrogen-containing combustible gas reaching 81.1% and 61.0%, respectively. Using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy to characterize the waste textiles before and after pyrolysis, it was found that nickel acetate was converted into metallic nickel (Ni0) during microwave pyrolysis. This active site significantly enhanced the pyrolysis process, and as the gas yield increased, the disorder of the resulting pyrolytic carbon also rose. The proposed Ni0-enhanced microwave pyrolysis mediated by nickel acetate offers a novel method for the efficient disposal and simultaneous resource recovery of waste textiles.
研究领域:
环境科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jia’nan Zhang,Zizhen Liu,Yihan Wang,Bo Yu
l-Homoserine is proven to be a promising precursor for the synthesis of l-phosphinothricin, which is a broad-spectrum herbicide with low toxicity. To enhance the sustainability of the process, the utilization of nonfood carbon sources for l-homoserine production is highly sought-after. Acetate, which can be captured from C1 gases, has the potential to become the most abundant feedstock for biomanufacturing. In this study, we systematically engineered the Escherichia coli strain to generate l-homoserine from acetate. The production of l-homoserine from acetate was initially achieved by deleting branch pathways, activating the glyoxylate shunt, and enhancing the synthetic pathway. The strain’s tolerance and acetate assimilation capabilities were strengthened through adaptive laboratory evolution. Reducing the flux toward gluconeogenesis further facilitated the production of l-homoserine. Finally, the engineered strain produced 15.96 g/L l-homoserine solely from CO2-derived acetate and formate in a 5 L fermentor via a fed-batch process. This study provides insights into the development of a low-carbon bioeconomy for the herbicide industry.
研究领域:
生物工程
·
可持续发展
·
合成生物学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Mingwei Xia,Wei Chen,Jing Wu,Yingquan Chen,Haiping Yang,Xu Chen,Danchen Zhu,Hanping Chen
Developing green, high efficient and precursor-universal pore tailoring approach is a major issue for biomass-derived porous carbon (BPC). In this study, the unique effect of organic salt porogen (potassium acetate) was first elucidated through investigating the component and temperature-dependent structure evolution of BPC during pyrolysis-activation process. Hydrogen bonding with biomass char rather than melting would facilitate the dispersion of porogen. Potassium acetate would catalyze cracking of biopolymers (<400 ℃) into H 2 , CO 2 , CO and CH 4 etc. and lead to plentiful macropores by gas blowing. And it decomposed into potassium species that etch the char to form micropores. Differently, cellulose and hemicellulose char intermediates with abundant carbonyl incline to retain the porous structure. BPCs from cellulose and hemicellulose possess specific surface area (SSA) ~ 1700 m 2 /g with nano-passages and three-dimensional layer framework structure. While lignin-derived BPC performs equally high SSA but bulky microporous structure. Besides, carbon layer would form from acetate decomposition and deposited on the char surface thus lead to similar surface structure. This study provides a novel insight of interaction between biomass char intermediate and organic salt porogen, which may demonstrate a precursor-universal and high efficient approach for BPC preparation.
研究领域:
材料科学
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化学工程
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生物质能
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Ran Wang,Guangyi Li,Hao Tang,Aiqin Wang,Guoliang Xu,Yu Cong,Xiaodong Wang,Tao Zhang,Ning Li
Decalin is a jet fuel additive with high thermal stability and energy density. Herein, we reported a novel method for the preparation of decalin from cyclopentanone, a hemicellulose derived cycloketone. Ethanolamine acetate (EAOAc), an ionic liquid catalyst which can be derived from biomass, was first applied to the self-aldol condensation of cyclopentanone and demonstrated good activity for this reaction. After the optimization of reaction conditions, ∼83.5% carbon yield of 2-cyclopentylidenecyclopentanone was achieved over the EAOAc catalyst. The hydrodeoxygenation of 2-cyclopentylidenecyclopentanone over a physical mixture of Ru/C and H-β zeolite afforded bi(cyclopentane) which could be further isomerized to decalin. Among the screened catalysts, La-Y zeolite exhibited excellent performance for the isomerization process. According to the characterization results, the high activity of La-Y was rationalized by its large medium-strong acid amount and the appropriate ratio of Brønsted acid to Lewis acid. Analogously, branched decalins were synthesized with cyclohexanone using the same procedure.
研究领域:
化学工程
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能源科学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2023
·Vol. 86
·期 8
·595-603
·
IF 1.7
Huang Dan,Tian Yufei,Zheng Yili,Li Mengyu,Xu Xia,Chen Hongyuan,Rui Wen
Forced degradation studies aim to systemically characterize the degradation products of an active pharmaceutical ingredient (API) and its formulations under harsh conditions that accelerate degradation. These studies are especially valuable for sustained-release products in selecting appropriate packaging materials and storage conditions in the field of pharmaceutics. To demonstrate the degradation pathways and degradation products of the API and products, mass spectrometry is used for further characterization of the degradation products. Goserelin acetate sustained-release implant, which is prepared by hot melt extrusion using biodegradable material polylactic acid-glycolic acid copolymer as a carrier, is used for the treatment of early breast cancer in premenopausal and perimenopausal women. In this study, a simple and sensitive high-performance chromatography method was established following the ICH guidance. We conducted forced degradation experiments to determine the conditions of the product. The forced degradation studies of the goserelin acetate sustained-release implant showed the presence of a single impurity during thermal degradation, as observed in the HPLC analysis. To elucidate the structure of the impurity and characterize its degradation pathway, we performed further characterization using LC–MS.
研究领域:
药学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Liu Yang,Gaoyi Han,Yunzhen Chang,Ying Zhang,Yaoming Xiao
High quality of perovskite film is considered as one of the most important factors on the photovoltaic properties in the perovskite solar cell (PSC). In this work, the magnesium acetate (MgAc 2 ) is first used as an effective additive to prepare high quality perovskite film through a synergistic effect Mg 2+ and Ac − , in which the Mg 2+ can enhance the conversion from PbI 2 to complete perovskite and the Ac − can adjust the crystallization rate to prepare dense and smooth perovskite film. Moreover, the Mg 2+ and Ac − can induce the trap states passivation of lead and iodide ions to reduce the charge recombination, which is critical to keep the high photovoltaic performance of perovskite films. As a result, the PSC with MgAc 2 shows higher efficiency and stability than those of the PSC without MgAc 2 .
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2020
·
IF 3.294
Wenfeng Zhao,Hu Li,Yan Li,Jingxuan Long,Yufei Xu,Song Yang
Using CO 2 as a low-cost C1 resource to produce value-add products was considered as a promising strategy for the sustainable carbon cycle . Herein, a base-promoted reductive functionalization of CO 2 and 1,2-phenylenediamine for the synthesis of benzimidazole was developed using hydrosilane as an H-donor. Commercially available acetate salt CH 3 COOK used as a budget catalyst could furnish various benzimidazoles with moderate to excellent yields (42-95%) under mild conditions (40 °C, 1 bar CO 2 ). The reaction mechanism undergoing cascade N -formylation, cyclization, and reduction was preliminarily confirmed by attenuated total reflection (ATR) technique and control experiments.
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 33
·13205-13211
·
IF 3.069
Ze-yu Zhang,Han Zhu,Quan-qing Xu,Feng-yi Liu,Ai-xin Zhu,Jun-feng Kou
Photoluminescent alginate hydrogels containing covalently linked YVO4–Eu3+ have been prepared by using a facile method. The environmentally friendly preparation procedure was carried out at room temperature using water as a solvent. The photoluminescent hydrogels showed outstanding acetone sensing properties with quick response, high sensitivity, short recovery time and good reversibility.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 9
·4237-4242
·
IF 3.5
Man Zhao,Xuemin Yang,Zimei Fu,Wenxiang Wang,Wei Wen,He Xiao,Li Zhang,Junming Zhang,Baoliang Lv,Jianfeng Jia
In this work, low-crystalized and defective NiOx/graphene was synthesized by a facile electrolysis-solvothermal method. In the electrolytic process, Ni ions originate from the Ni anode, and graphene is produced from the graphite cathode. Then, Ni ions are reduced into oxides and deposited on graphene in the subsequent solvothermal process. The NiOx/graphene displays excellent electrocatalytic activity and selectivity for ethanol oxidation reaction to acetate. The peak current density was 296.5 mA cm−2 on a glassy carbon electrode. The FE of acetate was more than 93% at the potential range between 1.4 and 1.7 V. We propose that the mechanism is a cooperation between the chemical deprotonating process of ethanol by Ni3+ species and the electrochemical oxidation of the CH3CH2O* intermediate to acetate at the interface between NiOx and graphene.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Hui Yang,Chun-Li Hu,Xiang Xu,Jiang-Gao Mao
The first examples of lanthanide borate–acetate mixed anion compounds, namely, Ln2(CH3CO2)2[B5O9(OH)]·H2O (Ln = La 1; Ce 2; Pr 3), were synthesized under hydrothermal conditions. These compounds are isostructural and crystallize in polar space group Cc. They display a unique three-dimensional (3D) framework built by a 3D network of lanthanide borate further decorated by acetate anions. The borate anion exhibits a 2D layer in the ac plane with large 9-member rings (MRs) which are filled by lanthanide(III) ions into a {Ln[B5O9(OH)]}− 2D layer. Adjacent {Ln[B5O9(OH)]}− layers are bridged by remaining lanthanide (III) ions to form a 3D network of lanthanide borate. It is noteworthy that Ln2(CH3CO2)2[B5O9(OH)]·H2O (Ln = La 1; Ce 2; Pr 3) can be changed into Ln2(CH3CO2)2[B5O9(OH)] (Ln = La 4; Ce 5; Pr 6) under heating at 500 K. Compounds 1–4 display moderate SHG signals of about 2.0, 1.0, 1.4, and 2.5 times that of KH2PO4, respectively, and they are phase matchable. Their SHG responses mainly arise from the synergistic polarization effects of both asymmetric borate clusters and π-conjugated CH3COO– anions.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）