CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yuling Ma,Airong Li,Cheng Wang
Metal-organic frameworks (MOFs) with a high specific surface area, an adjustable pore structure, and functionalized pore environment have a broad application prospect in gas adsorption and separation. In this work, a series of defective UiO-66 (UiO-66-monocarboxylic acid) samples were prepared by adding different monocarboxylic acids during the synthesis of UiO-66. UiO-66-monocarboxylic acid samples (UiO-66-formic acid, UiO-66-acetic acid, UiO-66-benzoic acid, UiO-66-acrylic acid, and UiO-66-cyanoacetic acid) had a high specific surface area (1200–1400 m 2 /g) and a good thermal stability (560 °C). In the desulfurization experiment of simulated flue gas (SO 2 /CO 2 /O 2 /N 2 , 0.3/10.0/5.5/84.2 vol%), the breakthrough time of UiO-66-cyanoacetic acid for SO 2 was higher (194 min/g), and the selectivity of SO 2 /CO 2 reached 33.8. Through optimizing the moles of cyanoacetic acid added, the breakthrough time of SO 2 on 18-UiO-66-cyanoacetic acid increased to 251 min/g. At a pressure of 1.0 bar and a temperature of 298 K, the adsorption capacity of SO 2 by 18-UiO-66-cyanoacetic acid reached 762.1 mg/g. In addition, the adsorption behavior of 18-UiO-66-cyanoacetic acid for SO 2 was considered as a combination of chemical and physical adsorption, and fractional chemisorption sites was provided by cyanoacetic acid.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 12
·1493
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IF 3.9
Feiyang Wen,Yuelin Xu,Fengxi Li,Jinglin Ma,Zhi Wang,Hong Zhang,Lei Wang
Disulfides, as fundamental scaffolds, are widely present in peptides, natural products, and pharmaceutical molecules. However, traditional synthesis of disulfides often involves the utilization of toxic reagents or environmentally unfriendly reaction conditions. In this work, a green and efficient method was developed for synthesizing pyrrole disulfides using β-ketothioamides and ethyl cyanoacetate as substrates, with lipase serving as a catalyst. Under the optimal conditions (β-Ketothioamides (1 mmol), ethyl cyanoacetate (1 mmol), PPL (200 U), and EtOH (5 mL)), lipase leads to the formation of pyrrole disulfides in yields of up to 88% at 40 °C. The related mechanism is also speculated in this paper. This approach not only presents a new application of lipase in enzyme catalytic promiscuity, but also offers a significant advancement in the synthetic pathway for pyrrole disulfides and aligns with the current mainstream research direction of green chemistry, contributing to the further development of environmentally friendly biocatalytic processes.Keywords:lipase;catalytic promiscuity;pyrrole disulfide;β-ketothioamides;cyanoacetate
研究领域:
生物化学
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绿色化学
✓ 已验证
DOI
高影响因子
RSC Advances
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2013
·Vol. 4
·期 11
·5591-5597
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IF 2.562
Zhao Hu,Xiao-dong Li,Wenjun Zhang,Aihui Liang,Dandan Ye,Zhitian Liu,Jing Liu,Yanjiao Liu,Junfeng Fang
Two novel star-shaped donor–acceptor small molecules, TPA–TBT–CN and TPA–TBT–R, with triphenylamine (TPA) as the core, benzothiadiazole (BT) as the arm, and alkyl cyanoacetate or 3-ethylrhodanine as the end-group are synthesized for application as donor materials in OSCs. The two small molecule films show broad absorption bands from 300 nm to 850 nm, narrow optical band gaps (1.5–1.7 eV), deep HOMO energy levels (−5.0 to −5.1 eV) and moderate hole mobilities. OSCs based on blends of the two donors and PC70BM acceptors exhibit power conversion efficiencies of 1.34% and 1.79%, respectively. Notably, TPA–TBT–R with 3-ethylrhodanine as the end-group displays a broader solar spectral coverage, a lower HOMO level, a higher hole mobility and higher photovoltaic properties. Our results indicate that 3-ethylrhodanine as the acceptor and end-group is a promising linker in constructing donor materials for high efficiency OSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON-ASYMMETRY
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2010
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IF 2.625
Zhen-Wei Zhang,Gui Lu,Miao-Miao Chen,Ning Lin,Yong-Bo Li,Tamio Hayashi,Albert S.C. Chan
The first asymmetric Mannich-type reaction of methyl isocyanoacetate with N -sulfonylimines catalyzed by cinchona alkaloid derivatives yielded 2-imidazolines with high diastereoselectivities and good enantioselectivities (up to >99:1 dr and 70% ee). This reaction provided a convenient route to access various substituted 2-imidazoline-4-carboxylates and related α,β-diamino acids in high enantiomeric purities.
研究领域:
有机化学
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药物化学
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不对称合成
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催化化学
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生物有机化学
✓ 已验证
DOI
高影响因子
Materials Today Communications
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2023
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IF 3.8
Cheng Hu,Lianhong Zhang,Qin Ye,Qiang Li
The ability of photocatalysts to combat environmental pollution can be effectively improved by defect modulation. This paper developed a donor-acceptor (D-A) precursor system using urea as the hydrogen bond donor and cyanoacetic acid as the hydrogen bond acceptor to successfully synthesize modified g-C 3 N 4 (CA-CNx). The results showed that while cyanoacetic acid addition contributed to the formation of N defects in g-C 3 N 4 , but cyanoacetic acid overuse caused structural disorder in CA-CNx. A decrease in the g-C 3 N 4 band gap and an improvement in the photogenerated carrier mobilities due to the inclusion of N defects may lead to more effective usage of visible light. The highest catalytic activity for methylene blue (MB) solution (40 mg/L) was demonstrated by the modified g-C 3 N 4 synthesized by adding 0.4 g cyanoacetic acid, and the degradation rate of the MB solution reached 90.4 % within 100 min. The proposed primary kinetic constant was 6.91 times higher than the original g-C 3 N 4 . According to free radical scavenging tests, superoxide radicals are the predominant active species during the catalytic breakdown of MB processes. This method provides a novel idea to producing g-C 3 N 4 with N-defects and the opportunity to comprehend the impact of structural defects in enhancing semiconductor photocatalytic activity.
研究领域:
环境科学
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材料科学
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化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2023
·Vol. 35
·期 49
·2306626
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IF 29.4
Xiaobin Yang,Yajie Wen,Yangxue Li,Linlin Yan,Chuyang Y. Tang,Jun Ma,Seth B. Darling,Lu Shao
Pressure-driven membrane separation promises a sustainable energy-water nexus but is hindered by ubiquitous fouling. Natural systems evolved from prebiotic chemistry offer a glimpse of creative solutions. Herein, a prebiotic-chemistry-inspired aminomalononitrile (AMN)/Mn 2+ -mediated mineralization method is reported for universally engineering a superhydrophilic hierarchical MnO 2 nanocoating to endow hydrophobic polymeric membranes with exceptional catalytic cleaning ability. Green hydrogen peroxide catalytically triggered in-situ cleaning of the mineralized membrane and enabled operando flux recovery to reach 99.8%. The mineralized membrane exhibited a 9-fold higher recovery compared to the unmineralized membrane, which is attributed to active catalytic antifouling coupled with passive hydration antifouling. Electron density differences derived from the precursor interaction during mediated mineralization unveiled an electron-rich bell-like structure with an inner electron-deficient Mn core. This work paves the way to construct multifunctional engineered materials for energy-efficient water treatment as well as for diverse promising applications in catalysis, solar steam generation, biomedicine, and beyond.
研究领域:
环境工程
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材料科学
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催化
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Results in Engineering
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2023
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IF 5
Tingting Dang,Miaomiao Gong,Bo Li,Guoqing Zhang,Xin Yang,Xu Wang,Daizong Han,Huiyong Chen
Three types of metal-doped ETS-10 zeolites including Ni-ETS-10, Al-ETS-10, and Ga-ETS-10 were successfully synthesized by one-pot template-free hydrothermal treatments. The effect of doping metals on the crystallinity, morphology, textural property, and basicity of the produced zeolites was systematically studied. It was found that doping with an appropriate amount of Ni could enhance the crystallinity and basicity of ETS-10 zeolites in comparison with Al and Ga, and the Ni species mainly existed in two forms of framework coordination and exchange site connection within Ni-ETS-10. The catalytic evaluation by the liquid Knoevenagel condensation reaction of benzaldehyde with ethyl cyanoacetate confirmed the superiority of ETS-10 and metal-doped ETS-10 in comparison with the contrast base zeolites of NaY and KY. And the 0.4Ni-ETS-10 catalyst exihibted the best performance with 75.6 % yield of ethyl ɑ-cyanocinnamate (ECC) among all the synthesized (metal-doped) ETS-10 zeolites. It is reasonable to expect that the demonstrated work has important implications for the design and facile synthesis of new-type high-performance base zeolite catalysts.
研究领域:
化学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 69
·40455-40461
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IF 3.049
Caicai Jiao,Lilong Gao,Bing Yu,Hailin Cong,Youqing Shen
The Michael addition and alkylation reaction of active methylene compounds (AMCs) with two active hydrogens had been investigated extensively in organic chemistry, while the polymerization of AMCs had few studies. Herein, we reported active methylene-based polyaddition and polyalkylation catalyzed via an organic superbase under ambient conditions. A model polymerization was first conducted between ethylene glycol diacrylate (EGDA) and methyl cyanoacetate (MCA). The molecular weight (Mw) of the model polymer was up to 50 500 g mol−1 with a high yield (99%). Eight AMCs were selected and a high-throughput parallel synthesizing instrument (HTPSI) was used to synthesize semi-library polymers of AMCs and EGDA via a Michael type polyaddition. The obtained AMC-based polymers had low cell cytotoxicity. Elastomers with cyanogen groups could be prepared using trimethylolpropane triacrylate (TMPTA) as a crosslinker. Furthermore, three dihalogen compounds were explored to polymerize with MCA and malononitrile via alkylation reactions. The pendent cyanogen or ester groups of the polymers could be reduced by lithium aluminum hydride. Novel polymer families were constructed based on the polyaddition and polyalkylation of AMCs.
研究领域:
有机化学
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高分子科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yong Gao,Changsheng Sun,Chenze Qi
Room temperature ionic liquids (RTILs)-containing Pickering emulsions exhibit promising application potentials because of the integration of the “green” quality and the tunable applications of RTILs with the advantages of Pickering emulsions, such as the high stability and adjustable droplet size. In the present study, sterically-stabilized polymer nanoparticles (SSPNs) were first prepared via the reversible addition-fragmentation chain transfer (RAFT)-mediated non-aqueous dispersion polymerization , in which poly(lauryl methacrylate) (PLMA) and poly(4-vinyl pyridine) (P4VP) acted as the stabilizer block and the core-forming block, respectively. Kinetically-trapped PLMA- b -P4VP spheres and mixed spherical/worm-like morphologies could be achieved at a target copolymer composition . Subsequently, core cross-linked SSPNs (CSSPNs) were obtained by means of chemical cross-linking of P4VP cores of SSPNs with 1,4-dibromobutane in a diluted solution of SSPNs in toluene (0.4 mg/mL). Stable 1-butyl-3-methylimidazolium tetrafluoroborate-in-toluene ([Bmim][BF 4 ]-in-toluene) non-aqueous Pickering emulsions could be formed at a low emulsifier content of 0.005 wt% adopting CSSPNs with mixed spherical/worm-like morphologies as Pickering emulsifiers. Benefiting from large surface areas of Pickering emulsions and unique chemical/physical properties of RTILs, [Bmim][BF 4 ]-in-toluene Pickering emulsions provided readily available platforms for many organic reactions . As a proof of the concept, proline catalyzed Knoevenagel reaction of 4-nitrobenzaldehyde with malononitrile was chosen as a model here. Both high reaction efficiency and good recyclability were observed.
研究领域:
材料科学
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化学工程
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有机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）