RSC Advances
·
2020
·Vol. 10
·期 47
·28059-28065
·
IF 3.119
Yunqi Fu,Mang Zheng,Qi Li,Liping Zhang,Shuai Wang,V. V. Kondratiev,Baojiang Jiang
Benzylamine coupling is a very important reaction for the synthesis of imine but still faces many challenges. Herein, we present a highly effective strategy towards the coupling reaction by using environmentally friendly catalysts. These catalysts are composed of Cu/Cu2O/Cu3N heterostructures supported by C3N4 tubes and the composites were synthesized by one-step hydrothermal treatment followed by calcination. Cu2O, Cu3N, and C3N4 all are responsive to visible light and the heterojunction formed can greatly enhance the charge separation. When used as photocatalysts for oxidative self-coupling of benzylamine at a low temperature of 323 K in air, Cu/Cu2O/Cu3N/C3N4 was able to give conversion and selectivity values of up to 99% and 98%, respectively. The high efficiency of the catalysts is attributable to their ability to generate large quantities of free radicals (such as ·OH and ·O2−) under visible-light irradiation.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2021
·
IF 5.875
Siyu Sun,Xiyou Du,Manfei Fu,Abdur Rauf Khan,Jianbo Ji,Weidong Liu,Guangxi Zhai
In this study, galactosamine-modified poly(ethylene glycol)-poly(lactide) (Gal-PEG-PLA) polymers were synthesized and Gal-PEG-PLA/D-α-tocopherol polyethylene glycol 1000 succinate (TPGS) micelles named as GPP micelles were designed to promote the oral absorption of a hydrophobic drug, curcumin (CUR). CUR-loaded Gal-PEG-PLA/TPGS micelles (CUR@GPP micelles) were fabricated using the thin-film dispersion method. CUR@GPP micelles had a size of about 100 nm, a near-neutral zeta potential , drug loading (DL) of 14.6%, and sustained release properties. GPP micelles with high Gal density (GPP3 micelles) were superior in facilitating uptake in epithelial cells and improving intestinal permeation. In situ intestinal absorption studies suggested that the jejunum and ileum were the best absorption segments in the intestinal tract. Additionally, biodistribution results revealed that GPP3 micelles could be remarkably taken up by the jejunum and ileum. Pharmacokinetics revealed that the maximum plasma concentration (C max ) and the area under the plasma concentration-time curve from 0 to 24 h (AUC 0–24 ) for CUR@GPP3 micelles were both significantly increased, and that the relative bioavailability of CUR@GPP3 micelles to CUR-loaded mPEG-PLA/TPGS micelles (CUR@PP micelles) was 258.8%. Furthermore, CUR-loaded micelles could reduce damage to the liver and intestinal tissues. This study highlights the importance of Gal content in the design of targeting nanocarrier Gal-modified micelles, which have broad prospects for oral delivery of hydrophobic drugs. Therefore, they could serve as a promising candidate for targeted delivery to the liver.
研究领域:
药剂学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qingdong Qin,Ting Liu,Jiaxuan Zhang,Rui Wei,Shijie You,Yan Xu
Hematite (α-Fe 2 O 3 ) has been commonly used as an eco-friendly catalyst for peroxymonosulfate (PMS) to generate free radicals (SO 4 •- and/or •OH). However, the activation efficiency of PMS relies heavily on the conversion of Fe(III) to Fe(II) that is slow and rate-limiting. In this study, oxygen vacancies enriched α-Fe 2 O 3 was prepared from thermally treated goethite (α-FeOOH) and employed as a PMS activator. Systematic characterization demonstrated that α-Fe 2 O 3 with most abundant oxygen vacancies could be obtained by heating α-FeOOH at 300 °C. The as-prepared α-Fe 2 O 3 exhibited excellent catalytic activity in activation of PMS for oxidation of sulfamethoxazole (SMX, k = 0.04 min −1 ). The SMX degradation rate was found to be positively correlated with the concentration of oxygen vacancies. Quenching experiments, EPR, LC/MS and XPS analysis revealed that singlet oxygen ( 1 O 2 ) was the predominant reactive oxygen species . The effects of pH, PMS dosage, catalyst loading, temperature, and anions on SMX degradation were comprehensively investigated. Moreover, the plausible degradation pathways of SMX in the α-Fe 2 O 3 /PMS system were proposed. This work not only provides a valuable insight into the mechanism of PMS activation by α-Fe 2 O 3 but also establishes a new strategy for the design of more efficient and practical iron-based catalyst for PMS activation.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 2
·339-346
·
IF 1.967
Wei Jinhui,Wu Chengyuan,Wu Xiangchuan,Wu Lina
Bisphenol A (BPA) interferes with the reproduction and endocrine system of humans and wild animals. For the detection of BPA, a sensitive and rapid detection method was established. BPA was imprinted on the surface of Fe 3 O 4 nanoparticles through dopamine self-polymerization. After the removal of BPA, molecularly imprinted microspheres with BPA recognition cavity were formed. The electrochemical impedance response increased with BPA embedded in the molecular imprinting layer. The electrochemical signal was proportional to the concentration of BPA with a linear range from 1 × 10 –11 to 1 × 10 –3 M and a detection limit of 5.78 × 10 –12 M. The proposed biosensor was used to detect the BPA in vegetable oil indicating a promising application in food-field monitoring. Graphic abstract
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Dongyuan Wang,Qiang Yin,Ming Zheng,Yongbo Xie,Wen He,Zheng Li,Sanying Hou,Hongqing Wang
It is of great importance to design a fluorescent sensor with high selectivity, sensitivity and large Stokes shift to zinc detection for environmental water sample and in vivo. Herein, A novel Zn 2+ fluorescent sensor with larger Stokes shift (110 nm) 1-((5-(4-(diphenylamino)phenyl)pyridine-2-imino)methyl)naphthalene-2-ol (abbr. TPA-PN) was designed and synthesized. In DMF-H 2 O (V: V = 1: 1, pH = 7.0) solution, it could achieve high selectivity and sensitivity to Zn 2+ , there was a linear responsive range of 0–20 μM of concentration of Zn 2+ ions for the sensor, the detection limit was as low as 19.134 nM and the binding constant was calculated to be 3.24 × 10 4 M −1 . The species of TPA-PN and zinc were clarified at different pH. Besides, the interaction properties and fluorescence mechanism were demonstrated by the species theory, density functional theory (DFT) calculation, 1 H NMR titration, FT-IR and MS. Most importantly, it provided a new real-time, on-site method and showed excellent potential in-vivo imaging ability.
研究领域:
分析化学
·
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Hazardous Materials Advances
·
2022
·
IF 0
Yurong Gu,Qi Han,Zijun Dong,Jiaxin Zhu,Chengchun Jiang,Jikun Qi
This study systematically investigated the performance of a sulfite mediated photolytic system on diatrizoate (DTZ) degradation and deiodization under different UV intensity, sulfite dosage, initial solution pH, initial DTZ concentration and co-present constituents. As compared with sole UV photolysis and sole sulfite reduction system, the UV/sulfite system performed a higher efficiency of DTZ degradation and deiodization. At the same time, the scavenging experiments were conducted by respectively adding KNO 3 , KNO 2 , MeOH and TBA, which indicated e aq − was the dominant active species responsible for the enhanced degradation and deiodination of DTZ. Effects of reaction factors showed that the UV/sulfite system was a promising technique for DTZ degradation. A complete removal of DTZ (40 µM) could be obtained under the UV intensity of I 0 (6.67 × 10 −7 einstein/cm 2 ∙s), sulfite dosage of 0.50 mM and pH ranging from 8∼10. In addition, the intermediate products of DTZ degradation were identified and possible degradation mechanism was proposed. Four possible products including TP504, TP488, TP486 and TP236 were obtained in this study. The main degradation pathways might include protonation, deiodination, substitution and heterocyclic formation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
Membranes
·
2022
·Vol. 12
·期 4
·417
·
IF 4.562
Mengling Zhang,Xiangyang Hu,Lei Peng,Shilin Zhou,Yong Zhou,Shijie Xie,Xiaoxiao Song,Congjie Gao
The realistic resistance zone of water and salt molecules to transport across a TFC-RO membrane is the topmost polyamide nanofilm. The existence of hollow voids in the fully aromatic polyamide (PA) film gives its surface ridge-and-valley morphologies, which confuses the comprehensions of the definition of the PA thickness. The hollow voids, however, neither participate in salt–water separation nor hinder water penetrating. In this paper, the influence of intrinsic thickness (single wall thickness) of the PA layer on water permeability was studied by adjusting the concentration of reacting monomers. It confirms that the true permeation resistance of water molecules originates from the intrinsic thickness portion of the membrane. The experimental results show that the water permeability constant decreases from 3.15 ± 0.02 to 2.74 ± 0.10 L·m−2·h−1·bar−1when the intrinsic thickness of the membrane increases by 9 nm. The defects on the film surface generate when the higher concentration of MPD is matched with the relatively low concentration of TMC. In addition, the role of MPD and TMC in the micro-structure of the PA membrane was discussed, which may provide a new way for the preparation of high permeability and high selectivity composite reverse osmosis membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Bioresources and Bioproducts
·
2020
·
IF 0
Huilin Xu,Dongyue Zhang,Jianshu Li
In this work, dopamine methacrylamide (DMA) and eugenyl methacrylate (EMA) were used to synthesize polymeric particles of Poly (DMA- co -EMA) by free radical precipitation copolymerization. These two monomers were modified from dopamine (consisting of the catechol moieties adhering to various materials) and eugenol (with antibacterial property), respectively. The proton nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared (FT-IR) spectroscopy were applied to confirm the successful synthesis of the two monomers and copolymer. The scanning electron microscope (SEM) images showed the size and morphology of the polymer particles. The results indicated that regular particles with uniform size could be obtained with a monomer feeding ratio of 5꞉5. The results of antibacterial activity test indicated that the obtained polymer particles have an antibacterial rate over 90% to Eugenia coli .
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
DOI
Analytical Methods
·
2021
·Vol. 13
·期 19
·2189-2195
·
IF 2.896
Lu Li,Jingru Li,Tiantian Meng,Zhanfang Liu,Hong Zhou,Jun Zhu,Junqing Shi
In this study, based on silica hollow sphere photonic crystals (SHSPCs), a simple and selective fluorescence sensor for high-performance diethylamine detection was developed. The sensor does not involve complicated integration of arrays or tedious synthetic work. During the detection, the SHSPCs could significantly enhance the fluorescence intensity of rhodamine 6G (Rh6G), and meanwhile, adsorb some Rh6G on their surface. Due to the competitive adsorption, diethylamine could free the Rh6G which was adsorbed on the surface of the SHSPCs, thus enhancing the fluorescence emission intensity with the increase of Rh6G concentration. The second enhancement of the fluorescence emission enabled the selective detection of diethylamine. It is remarkable that a simple and readily available dye (Rh6G) facilitates the efficient detection of diethylamine. Moreover, the sensor has good interference immunity, stability and reusability.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2019
·Vol. 77
·期 11
·5899-5912
·
IF 1.858
Li Jianwei,Yu Ni,Jing Zhanxin,He Xinhai,Shi Xuetao,Zhang Guangcheng
This work provides a method for fabricating rigid polyimide foams via thermal foaming method of nadimide-end-capped polyester-amine oligomer (NPEAO) precursor particles, which were synthesized by reaction of benzophenone-3,3′,4,4′-tetracarboxylic dianhydride and cis -5-norbornene-endo-2,3-dicarboxylic anhydride (NA) with different diamines. The foaming mechanism of the rigid PI foams was systematically investigated. The experiment demonstrates that the pre-treatment of the NPEAO precursor particles and foaming temperature are two pivotal factors that determine the foaming processes. The densities of the prepared rigid PI foams are mainly in the range of 40–200 kg m −3 . Moreover, the density and morphology of the PI foams can be effectively controlled by adjusting these two factors. Besides, the obtained rigid PI foams present excellent mechanical and thermal properties, specifically, the flexural and compressive strength reaches as high as to 1.42 MPa and 0.47 MPa, respectively, with the density of 0.076 g cm −3 , which are superior to common PI foams and aerogels that of reported in the literature. Therefore, these superior mechanical and thermal properties make obtained rigid PI foams promising candidates as structural materials in the advanced manufacturing industry.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Shiming Zhang,Qianhao Pan,Yapei Wang
Renewable solid sorbents for CO 2 capture and storage have shown great potentials for the sake of gaseous separation, tail gas treatment, environmental regulation and climate governance. However, current existed preparation and reusability of solid sorbents are generally subject to high energy consumption and complicated procedure. Herein, a light-controlled CO 2 separation system with high working temperature resulting from natural sawdust combined with polyethyleneimine is fabricated, which involves low energy input and few operating sequences. This system shows a direct and ratiometric response to sunlight illumination by which CO 2 can be reversibly adsorbed and released. This light-controlled CO 2 separation process is prospective to become an attractive alternative to traditional alkaline CO 2 collection method in terms of its convenience and low cost. As a practical demonstration, CO 2 mixed with N 2 is successfully separated through this light-controlled carbon capture and storage (CCS) system, which offers great promise for CO 2 capture and enrichment with applicability across a wide range of scales.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Gas Science and Engineering
·
2023
·
IF 0
Rui Zhang,Haonan Liu,Ruixi Liu,Yingjie Niu,Luning Yang,Francesco Barzagli,Chao'en Li,Min Xiao
The blending of primary amines, with fast reaction kinetic, together with tertiary amines, with a large loading capacity, is an increasingly popular approach to develop high-performance CO 2 capture sorbents with low energy requirements for regeneration. In this study, we investigated the CO 2 absorption performance of several aqueous solutions obtained by mixing ethanolamine (MEA) and diethylethanolamine (DEEA) and compared them with that of individual MEA and DEEA. CO 2 loadings at equilibrium were measured experimentally under a wide range of operating conditions, at temperatures between 298 and 323 K, CO 2 partial pressures in the range 5–60 kPa, and different amine mixing ratios. In addition, 13 C NMR spectroscopy was employed to elucidate the reaction mechanisms and identify the species formed during CO 2 capture. The results of the study reveal the intricate interplay of MEA and DEEA in CO 2 capture, where MEA carbamate formation predominates in the early stages, gradually shifting to bicarbonate formation as the amine concentration decreases. Moreover, excess properties, which reflect non-ideal behaviors in amine blends, were introduced as a key parameter in the study. An excess property model, based on excess CO 2 loading, was developed to accurately predict the CO 2 equilibrium solubility without constant experimental measurement. As a result, good agreement was found between the experimental data and those calculated with the model (excess CO 2 loading) under the same operating conditions, with a average relative deviation of 1.1%.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
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