JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiaochen Han,Chongyang Guo,Yugao Wang,Gang Liu,Jun Shen
Furan-2,5-dicarboxylic acid (FDCA) is an important biomass-derived diacid, and it is the most promising substitute for terephthalic acid. The common method of FDCA usually involves 5-hydroxymethylfurfural oxidation. Edible fructose is often used as the feedstock of 5-hydroxymethylfurfural, and the oxidation step would generate undesirable impurities. Herein, FDCA was novelty synthesized by carboxylation of formate and 2-furoic acid (FA) derived from unedible-biomass. This route is potentially advantageous because it is simple to operate and does not require any additional additives. The reaction mechanism has been elucidated by density functional theory (DFT) calculations. In the carboxylation process, the C(sp 2 )-H bond of formate (HCOOM) undergoes cleavage, generating the carbon dioxide radical anion (CO 2 •− ). Subsequently, CO 2 •− attacks the C 5 of FA, forming the C C bond and ultimately yielding FDCA. The conversion of HCOOM to CO 2 •− is an effective way to achieve carboxylation reaction. The rate-determining step of the carboxylation reaction is the cleavage of the C(sp 2 )-H bond of HCOO − with activation barrier of 159.11 kJ⋅mol −1 . The investigation would provide a new strategy for the mechanism of carboxylation reactions, and hold the potential to establish pathways for FDCA production.
研究领域:
化学
·
材料科学
·
生物化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Ziheng Bai,Qi Liu,Hongsen Zhang,Jingyuan Liu,Jing Yu,Jun Wang
The development of nuclear energy requires the consumption of large amounts of uranium resources, and the uranium in seawater is very abundant. Therefore, it is very important to collection of uranium from seawater using efficient and convenient methods. In this work, imidazole-4, 5-dicarboxylic acid (H 3 IMDC) was introduced onto the surface of hemp fibers (HF) by two-step method to prepare a novel bio-based polymeric material HF-H 3 IMDC 3 adsorbent containing imidazole nitrogen and carboxyl groups. The introduction of H 3 IMDC could improve the activity sites and hydrophilicity of the HF, which significantly increased the adsorption capacity of uranium. The results showed that the maximum adsorption capacity of HF-H 3 IMDC 3 is 469.48 mg/g at pH 7.0 and 313 K. Adsorption process was more suitable for the pseudo-second order model. Moreover, HF-H 3 IMDC 3 exhibited good selectivity and reusability. More importantly, the HF-H 3 IMDC 3 also presented excellent adsorption performance in natural seawater, indicating that HF-H 3 IMDC 3 has a great prospect for the extraction of U(VI) from seawater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Junmou Du,Huihuang Fang,Hongyan Qu,Jinping Zhang,Xinping Duan,Youzhu Yuan
5-Hydroxymethyl-2-furfural (HMF) is a key platform molecule for biomass utilization. The HMF derivative 2,5-furandicarboxylic acid (FDCA) by oxidation of HMF is a promising alternative for terephthalic acid as a monomer in polyethylene terephthalate. However, due to the facile purification of dimethyl furan-2,5-dicarboxylate (DMFD), an oxidative esterification derivative of HMF, is more desirable. In this work, supported Au–Cu bimetallic catalysts with Au–CuO x ( x = 0–1) nanohybrids were prepared by a reduction–oxidation pretreatment strategy. The as-prepared catalysts were used for the oxidative esterification of HMF into DMFD under base-free conditions using oxygen as sole oxidant. Activity tests showed that the optimized Au–Cu/γ-Al 2 O 3 catalyst displayed a remarkably high DMFD yield of up to 98% and a turnover frequency (TOF) value of 243 h –1 , whereas the monometallic Au and Cu catalysts exhibited poor performance. Various characterizations confirmed the strong interaction between Au nanoparticles and CuO x species, and their synergistic effect on the enhanced performance of HMF oxidative esterification. The reduction–oxidation pretreatment promoted the dispersion of CuO x and intensified the interaction of Au nanoparticles with CuO x . A plausible reaction mechanism for the oxidative esterification of HMF over Au–Cu/γ-Al 2 O 3 was proposed. This work provided new insights into the effect of reduction–oxidation pretreatment on the fabrication of supported Au–CuO x nanohybrids for the production of DMFD by HMF oxidative esterification.
研究领域:
化学工程
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催化科学
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生物质转化
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Wenqing Li,Jingyue Zhang,Linhan Fan,Yun Zhao,Changyan Sun,Wenjun Li,Zhidong Chang
Aniline is an organic pollutant with carcinogenicity and teratogenicity, while F - and Hg 2+ are toxic ions that are easily soluble in water. When they are released to the environment, they will pose a threat to human health. Designing a material that can simultaneously detect three types of pollutants is of great significance. In this paper, a novel rare earth metal organic framework material (Eu-MOF) with three-dimensional structure based on 1-methylimidazole-4,5-dicarboxylic acid was synthesized for the first time through solvent thermal method. It has excellent luminescent performance and can be used as a multifunctional fluorescent probe to detect aniline, F - , and Hg 2+ based on photoinduced electron transfer, energy competitive absorption, and ion exchange mechanisms, with detection limits of 1.79 × 10 -8 , 8.13 × 10 -8 , and 8.83 × 10 -7 M, respectively. It is worth noting that Eu-MOF can detect F - and Hg 2+ in real water samples, such as lake water and green tea water, with favorable recovery rates.
研究领域:
材料科学
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环境化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 6
·1069-1070
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IF 0.3
Yan-Qing Wang,Wen-Qing Yan,Li-Xue Nie,Ping-Ping Luan,Chao-Qun Li
C 20 H 22 Cu 3 N 8 O 10 , monoclinic, C 2/ c (no. 15), a = 12.0766(11) Å, b = 16.2778(14) Å, c = 14.7605(13) Å, β = 97.8580(10) ∘ , V = 2874.4(4) Å 3 , Z = 4, R
gt ( F ) = 0.0420, wR
ref ( F
2 ) = 0.0988, T = 298.15 K.
研究领域:
无机化学
·
晶体学
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DOI
高影响因子
危险品化学品经营许可证（带存储）