FUEL
·
2024
·
IF 6.7
Sitong Liu,Shengli Niu,Hewei Yu,Kuihua Han,Sunwen Xia,Zihao Yang,Yue Zheng,Yujiao Zhang,Yanan Hao,Abulikemu Abulizi
The current transesterification for biodiesel is normally conducted with heat input and the resource is required to remove the contained water, which is complicated and costly. The novel magnetic catalyst of the bimetallic oxides of CeO 2 and Fe 3 O 4 supported on the hierarchical pore ZSM-5 was prepared and used for the biodiesel production through transesterification of palm oil with methanol under the electrolytic assistance. The prepared catalysts were characterized by SEM-EDS, TEM, FTIR, XRD, CO 2 /NH 3 -TPD, N 2 adsorption–desorption and VSM, etc. The loaded cerium stimulated the particles growth and abundant catalytic active sites were obtained due to the coral-like structure and they were beneficial for transesterification. The presence of both acidic and basic sites guaranteed the strong catalytic capability of the CeO 2 /ZSM-5@Fe 3 O 4 catalyst. Under the optimized transesterification condition of the catalyst dosage of 3 wt%, methanol to oil molar ratio of 18:1, reaction time of 2.5 h, electrolysis voltage of 40 V, presence of 2 % wt/wt of water added and reaction temperature of 25 ℃, the FAME yield of approximately 95 % was achieved. Also, the catalyst showed an acceptable reusability, where the FAME yield of 79 % was obtained after fourth reused cycle. In conclusion, the water in the resource promotes the electrolytic transesterification to occur efficiently at the room temperature.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Tao Chen,Yulong Li,Fangpei Ma,Mingdong Sun,Ping Fu,Xiaoling Liu,Yu Zhou,Jun Wang
Paired electrocatalytic systems have emerged as a promising approach for the synthesis of high-value-added fine chemicals from renewable resources like biomass, however, a high-performing bifunctional catalyst is urgent to reduce the overall cell voltage and enhance the current efficiency. Herein, amino-tethered Ni3S2/MoS2 heterojunction (NiMoSx-NH2) was constructed as the bifunctional catalyst simultaneously for the anodic 5-Hydroxymethylfurfural oxidation into furan dicarboxylic acid and cathodic 4-nitrophenol hydrogenation into P-aminophenol, providing the high conversion/yield/Faradic efficiency above 98% on both electrodes. Amino-tethered Ni3S2/MoS2 heterojunction, on the one hand, accelerated the electron transfer, and on the other hand, promoted the catalysts’ proton-coupled electron transfer process to generate NiIII-O(OH)ad at the anode and H* desorption at the cathode. A highly efficient paired electrolyzer with NiMoSx-NH2 as a bifunctional catalyst was assembled, showing an extremely low cell voltage of 0.89 V at 10 mA cm-2 and ~200% current efficiency at 1.75 V for the overall reaction.
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2012
·Vol. 38
·期 7
·1421-1429
·
IF 0.697
Li He-ping,Qin Long,Wang Zhou-dong,Li Shan
In order to improve drug loading and achieve a good release effect, this paper adopts the ramose method, choosing chitosan as the carrier and 5-fluorouracil (5-Fu) as a model drug. Ramose chitosan-lysyl-5-Fu(3) and ramose tetralactosyl-lysyl-chitosan-5-Fu(6) were synthesized successfully, then the in vitro release of (6) was researched. The results show that the drug loading of (3) and (6) are 9.17 and 1.63% (w/w), respectively. The in vitro release behavior of (6) in pH 7.4 phosphate buffer solution and pH 1.2 HCl–KCl solution were studied. The zero order release time that (6) maintains in alkaline and acidic media are 64 and 24 h, and the total release by 184 h are 71.97 and 82.34%, respectively. The performance is smooth throughout the whole stage of release, and the concentration of cumulative release is lower in the alkaline environment than in the acidic environment over the same time.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Zhufeng Hu,Yuchen Tong,Min Wang,Bing Sun,Huijuan Bai,Junbo Xu,Chao Yang
The preparation of polyimide matrix composites with low curing temperature and high mechanical properties is of great importance. In this study, a low-cost and multi-functional nanofiller, 5-aminobenzimidazole grafted graphene oxide (5-ABZ@GO) has been designed. By nucleophilic attack on 5-aminobenzimidazole basic groups and doping of GO, the above requirements of polyimide composites were skillfully realized. The results show that when the addition of 5-ABZ@GO is 1%, the 5-ABZ@GO/PI nanocomposites can achieve complete imidized at 200°C. Moreover, the nanocomposite prepared by imidization at 200°C has good mechanical and thermal properties (tensile strength is 141.64 MPa, modulus is 6.05 GPa, T 5% is as high as 543.5°C), which is better than the PI composites prepared at 320°C. This study provides an innovative approach to preparing polyimide composites that meet mechanical performance requirements while utilizing comparatively lower curing temperatures, low curing temperature polyimide resins provide a new path for integrated composites with structure–function integration.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2012
·Vol. 14
·期 10
·2752-2758
·
IF 6.32
Yu-Nong Li,Jin-Quan Wang,Liang-Nian He,Zhen-Zhen Yang,An-Hua Liu,Bing Yu,Chao-Ran Luan
A combined experimental and computational study on the imidazolium ionic liquid-promoted conversion of fructose to 5-hydroxymethylfurfural (HMF) was performed. In particular, 1-butyl-3-methyl-imidazolium bromide (BMImBr) was found to be unexpectedly effective for conversion of fructose into HMF without utilizing any other additive or catalyst. Under the optimized conditions, nearly 100% conversion of fructose with a 95% yield of HMF could be obtained. In addition, BMImBr could be easily recovered and reused over 6 times without significant loss of activity. This protocol represents a simple, recyclable and environmentally friendly pathway for HMF production. Furthermore, the detailed mechanism of the BMImBr-promoted conversion of fructose into HMF was also studied through an in situ FT-IR technique, NMR and density functional theory calculations, and demonstrated that the hydrogen bond interaction between BMImBr and fructose could play an important role in promoting the dehydration of fructose. This work also provides further understanding at the molecular level of the reaction process for ionic liquid-promoted conversion of fructose to HMF.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 7
·3386-3396
·
IF 3.5
Mingfu Li,Liqun Jiang,Sufei Feng,Junsheng Huang,Pingjun Zhang,Jian Zhang
In this study, an efficient modification strategy was proposed by facile loading of trace aluminum ions and p-toluene sulfonic acid (p-TSA) in carbon materials to improve their catalytic activity. p-TSA is then proven to regulate the carbonization process and promote the formation of mesoporous and multilayer structures. The hexa-coordinated aluminum structure is characterized by 1H–27Al solid-state nuclear magnetic resonance (SSNMR) and X-ray photoelectron spectroscopy, which serves as the Lewis–Brønsted acid site in carbocatalysts. Accordingly, the resulting catalyst facilitates a yield of ∼70% for converting glucose to 5-hydroxymethylfurfural (HMF) with a maximum carbon balance of around 91.4% at 150 °C in 6 h. In situ NMR, electrospray ionization mass spectrometry and isotope labeling analysis reveal that the hexa-coordinated aluminum sites promote the isomerization of glucose, and the sulfonic groups facilitate the subsequent dehydration and rehydration of fructose and levoglucosan intermediates. Kinetic models further indicate the decreased energy barrier for glucose conversion over the Al3+/p-TSA intercalated carbocatalyst. This work provides a promising strategy for engineering waste-derived carbocatalysts toward effectively converting carbohydrates to precursors of biofuels and bioplastics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202302845
·
IF 1.9
Xia Tian,Jianrong Han,Wei Li,Wei Yuan,Yuting Li,Yupeng Wang,Chengbin Wang,Wei Su,Shouxin Liu
Graphical As chemosensor, a novel d -gluconamide-functionalized water-soluble pillar[5]arene ( GWP5 ) displays high sensitivity and selectivity toward Fe 3+ ions over competing metal ions, based on fluorometric and colorimetric measurements. This fluorescent probe could be applied to the detection of Fe 3+ ions in real environmental water samples and in serum samples. A novel d -gluconamide-functionalized water-soluble pillar[5]arene ( GWP5 ) was synthesized through a simple synthetic route. GWP5 showed a remarkable aggregation-induced emission (AIE) with increasing concentration. This feature served as the basis for the construction of an AIE-based sensor for fluorescence detection of Fe 3+ with high sensitivity and selectivity, with a linear relationship between luminescence quenching and Fe 3+ concentration observed from 0 to 20 µM, and a limit of detection of 7.84 × 10 −9 M. This fluorescent probe could be applied to the detection of Fe 3+ ions in real environmental water samples and in serum samples.
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 2
·42
·
IF 3.6
Jihao Zuo,Mengkang Lu,Jinting Cai,Ruopeng Lan,Xinjuan Zeng,Cailong Zhou
The discharge of large volumes of textile dyeing wastewater, characterized by poor biodegradability and high toxicity, poses severe threats to the environment. In this study, polyvinylidene difluoride (PVDF) membranes were prepared using the nonsolvent-induced phase separation (NIPS) method, with porous amino-functionalized mesoporous silica nanoparticles (Am-MSNs) mixed into the casting solution to fabricate the Am-MSN/PVDF mixed matrix membranes. By varying the amount of Am-MSNs added, the microstructure and overall performance of the membranes were comprehensively analyzed. The results demonstrated that the addition of Am-MSNs significantly enhanced the hydrophilicity of the membranes. The high specific surface area and amino groups of Am-MSNs facilitated interactions with dye molecules, such as Reactive Black 5 (RB5), through hydrogen bonding, electrostatic attraction, and physical adsorption, resulting in a marked improvement in RB5 rejection rates. Static adsorption tests further validated the superior adsorption capacity of the Am-MSN/PVDF mixed matrix membranes for RB5. Additionally, the nanoscale mesoporous structure of Am-MSNs enhanced the mechanical strength of the membranes. The synergistic effects of the mesoporous structure and amino groups significantly increased the efficiency and stability of the Am-MSN/PVDF mixed matrix membranes in dye removal applications, providing an effective and sustainable solution for the treatment of dye-contaminated wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Jing Zhang,Xun Kuang,Linyu Zhu,Xintong Xiao,Zhongyue Zhou,Fei Qi
Despite the crucial roles of cyclohexanones across various industrial sectors, notably in the production of nylon and plastics, their conventional production heavily relies on fossil resources. The exploration of highly efficient routes to convert renewable biomass into cyclohexanones holds promise for advancing sustainable chemical processes, especially with the growing concerns in energy and the environment. Herein, we report the direct conversion of lignin-derived phenolic compounds to cyclohexanones through hydrodeoxygenation using PdFe/HZSM-5 catalysts. The successful achieved conversion of guaiacol was up to 97.27%, with a greatest selectivity of 90.59% to cyclohexanone on PdFe1.5/HZSM-5. Characterization of the catalysts further revealed that bimetallic catalyst promoted the dispersion of PdFe on HZSM-5 and facilitated the interactions between PdFe because of electron transfer, which collectively facilitated surprising outcomes. This work offers a promising strategy for improving lignin valorization within the context of producing sustainable chemicals and industrial materials.
✓ 已验证
产品关联
DOI
高影响因子
BRAZILIAN JOURNAL OF MEDICAL AND BIOLOGICAL RESEARCH
·
2024
·
IF 1.9
Liu Lilong,Wang Yexin,Dong Yanyan,Lin Shan,Guan Wenhui,Song Jia
The clinical application of 5-fluorouracil (5-Fu), a potent chemotherapeutic agent, is often hindered by its well-documented cardiotoxic effects. Nevertheless, natural polyphenolic compounds like resveratrol (RES), known for their dual anti-tumor and cardioprotective properties, are potential adjunct therapeutic agents. In this investigation, we examined the combined utilization of RES and 5-Fu for the inhibition of gastric cancer using both in vitro and in vivo models, as well as their combined impact on cardiac cytotoxicity. Our study revealed that the co-administration of RES and 5-Fu effectively suppressed MFC cell viability, migration, and invasion, while also reducing tumor weight and volume. Mechanistically, the combined treatment prompted p53-mediated apoptosis and autophagy, leading to a considerable anti-tumor effect. Notably, RES mitigated the heightened oxidative stress induced by 5-Fu in cardiomyocytes, suppressed p53 and Bax expression, and elevated Bcl-2 levels. This favorable influence enhanced primary cardiomyocyte viability, decreased apoptosis and autophagy, and mitigated 5-Fu-induced cardiotoxicity. In summary, our findings suggested that RES holds promise as an adjunct therapy to enhance the efficacy of gastric cancer treatment in combination with 5-Fu, while simultaneously mitigating cardiotoxicity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Ting Wu,Xiang Zhang,Hongju Liang,Quan Wang,Chun-Ling Liu,Wen-Sheng Dong
The design of highly efficient and cost-effective catalysts for the conversion of biomass-derived 5-hydroxymethylfurfural (5-HMF) into sustainable liquid fuel 2,5-dimethylfuran (DMF) is both important and challenging. In this study, we developed a non-noble Co catalyst supported on SBA-15 (25Co/SBA-15). Our results demonstrate that this catalyst exhibits remarkable efficiency in selectively hydrodeoxygenating 5-HMF to DMF, achieving a DMF yield of 96.3 % with complete conversion of 5-HMF under mild reaction conditions (150 °C, 2.0 MPa H 2 for 2 h). Notably, the productivity rate of DMF reached an exceptional value of 19.1 mmol·gcat −1 ·h −1 , surpassing most previously reported catalysts in literature. Additionally, by utilizing two distinct solvents - N,N-dimethylformamide (N,N-DMF) resulting in a high yield of 2,5-bis(hydroxymethyl)furan (BHMF) and tetrahydrofuran (THF) yielding an even higher yield of DMF - our approach enables facile switching between these two products during hydrogenation over the Co/SBA-15 catalyst. Furthermore, our catalyst demonstrates excellent reusability and can be easily regenerated through calcination in air. The exceptional catalytic performance of the catalyst can be ascribed to the synergistic effect between metallic Co and adjacent Lewis acidic Co 2+ in CoO dispersed on the surface of SBA-15. A dual-site Langmuir–Hinshelwood–Hougen–Watson (LHHW) model was proposed for the hydrodeoxygenating 5-HMF to DMF.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Xiao-Ping Zheng,Xin-Yu Tian,Yu Chai,Ya-Peng Du,Yu-Cang Zhang,Yan-Zhen Zheng
This study explores an efficient catalytic system for the conversion of chitosan into 5-hydroxymethylfurfural (5-HMF) under hydrothermal conditions. The catalysts used are deep eutectic solvents (DESs) comprising choline chloride (ChCl) as the hydrogen bond acceptor (HBA) and various organic acids as the hydrogen bond donor (HBD). Among the DESs tested, the ChCl: oxalic acid (OA) combination exhibits the highest catalytic activity, resulting in a yield of 27.5% 5-HMF employed the optimized conditions. To elucidate the interaction between ChCl and OA, various analytical techniques were employed, including quantum chemical calculations, nuclear magnetic resonance (NMR), and Fourier transform infrared spectroscopy (FTIR). These investigations confirmed the formation of strong hydrogen-bonds between ChCl and OA. Furthermore, the solid residues obtained during the conversion process were characterized using FTIR, X-ray diffraction (XRD), and scanning electron microscopy (SEM). These analyses provide insights into the chemical structures and morphologies of the residues, revealing the gradual conversion of chitosan, along with the formation of humin by-products.
✓ 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）