ACS Applied Materials & Interfaces
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2020
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IF 8.758
Zhenyu Zhang,Ying Qiao,Fei Liu,Jing Chen,Haining Na,Jin Zhu
In this work, hydroxyl-enriched glucose-based carbonaceous sphere (HEGCS) is prepared by hydrothermal method as an accelerator to enhance the hydrolytic efficiency of the treated cellulose to sugar in low-acidic aqueous system under microwave radiation. Due to the strong affinity of HEGCS to cellulose, during the hydrolysis, the treated cellulose can be flaked into small fragments by HEGCS, which is like a “microball milling”, and accordingly, the hydrolytic accessibility of cellulose is extremely improved. Highly efficient hydrolysis of cellulose to sugar is finally achieved in HEGCS containing 0.02 mol/L sulfuric acid. One hundred percent conversion of cellulose and 96.0 ± 4.0% total reducing sugar (TRS) yield was obtained within 15 min under microwave radiation. The average content of glucose in sugar products is over 70%. Our research not only obtains a catalytic accelerator to establish an effective method for hydrolyzing treated cellulose to sugar but also provides the idea for regulating cellulose accessibility during hydrolysis to achieve high efficiency in the hydrolysis of cellulose.
研究领域:
生物化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2020
·Vol. 38
·期 4
·399-405
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IF 3.826
Ying Qiao,Lixin Feng,Zhongqiu Li,Zhenyu Zhang,Jing Chen,Haining Na,Jin Zhu,Lai Chen
Summary of main observation and conclusion Five types of ZrO 2 are used to simply establish an effective aqueous catalytic system with sulfuric acid for the hydrolysis of cellulose to sugar, respectively. By adjusting surface roughness and particle size of ZrO 2 , different adsorption is produced. Accordingly, following the thought to inhibit the self-aggregation nature of cellulose, after the introduction of ZrO 2 with adsorption in catalysts, the efficiency of the hydrolysis of cellulose to sugar is improved. The results show different ZrO 2 can produce different effects during the hydrolysis of the cellulose with relatively low crystallinity. Under the optimal conditions, the conversion of cellulose and TRS yield reaches 95.5% and 93.6%, respectively. Through this research, it reveals the critical point to organize a feasible and useful way for the hydrolysis of cellulose to sugar with high efficiency in an aqueous system. An important theoretical and technical support is also provided for the conversion and utilization of cellulose in the future.
研究领域:
生物化学
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Jialin Ma,Xinrui Du,Mingxiang Wu,Haoyang Geng,Yonghao Wu,Mingxuan Wang,Qiule Zhang,Meijun Ji,Yanfeng Zhang
Zeolite DDR is a small pore zeolite with high application potential in catalysis, adsorption and membrane separation . However, its application is greatly limited by lengthy synthesis time. Various approaches, such as fast heating, reactive raw silica source, special mineralizing agent, seeding, and high synthesis temperature were combined to accelerate crystallization kinetics . The obtained DDR samples were systematically characterized by XRD , SEM, NMR and nitrogen adsorption-desorption. The fastest synthesis was realized by combining microwave radiation , and active (NH 4 ) 2 SiF 6 as silica source, in which high quality DDR zeolite with high yield was obtained in only 5 min. Moreover, replacing toxic (NH 4 ) 2 SiF 6 with safe silica sol led to improved process environment-friendliness and longer synthesis time of 10 min. Finally, replacing expensive microwave heating with economical oil-bath heating resulted into efficient synthesis of zeolite DDR in only 15 min, which would facilitate its commercial applications in adsorption, catalysis and membrane separation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2011
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IF 2.594
Qin Chen,Wenjun Xiao,Lilong Zhou,Tinghua Wu,Ying Wu
Hydrolysis of chitosan in ionic liquids was carried out under microwave irradiation (MW) using sulfonic acid-functionalized ionic liquids (SFILs) as catalysts. The effect of microwave power, irradiation time, dosage of SFILs and DMSO was investigated by orthogonal tests. Under the optimal reaction conditions, the yield of total reducing sugars (TRS) reached over 90% within 2 min. The viscosity-average molecular weight of degraded chitosan was determined by viscosity method. The structures of the original and degraded chitosan were characterized by Fourier-transform infrared (FTIR) spectra, X-ray powder diffraction (XRD) analysis and carbon-13 nuclear magnetic resonance spectroscopy ( 13 C NMR). The influence of microwave power and irradiation time on the TRS and M v was further studied. This method can dramatically reduce reaction time.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2021
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IF 0.782
Chun-Jing Li
We report a direct cross-coupling reaction between (het)aryl pivalates/tosylates and di(het)arylzinc species in 2-methyltetrahydrofuran/N-methyl pyrrolidone (1:1), which occurs via C–O bond cleavage under microwave irradiation. The reaction takes place smoothly in short reaction times without the addition of any catalyst or ligand. The reaction is suitable for a broad scope of substrates and exhibits good functional group compatibility, utilizes a simple work-up procedure, and gives the desired products in high purity.
研究领域:
有机化学
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合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Ting Huang,Huang-xian Zhang,Xiao-hua Zhang,Da-yong Peng,Xu-liang Nie,Jing Chen,Wan-ming Xiong
A kind of functionalized diallylimidazole ionic liquids (CnDAIMF) was synthesized and applied in the dehydration of D-fructose to produce 5-HMF under the microwave radiation. The results showed that X-ray, 1 H NMR and FT-IR confirmed the production. The target ILs existed in a highly centrally symmetric, and crystalline state at room temperature, with a good thermal stability up to 300 °C (HTD ≥ 340 °C). In the experiments of conversion D-fructose to 5-HMF, 5-HMF could be obtained via the catalysis of diallylimidazole IL whether in water or DMSO. The catalytic performance of these ILs was not much different from that of solid acid (like camphor sulfonic acid or solid carbon sulfonic acid), and which was higher than that of the monoimidazole hexafluorophosphate or imidazole class bromine salt, but there were no obvious changes can be found with the variation of carbon chain length between imidazole rings in diallylimidazole IL. The effects of temperature and solvent on the reaction were more significant. The optimized yield of 5-HMF was 52.59% at 185 °C in a water-C 2 DAIMF solvent (t = 10 min), while 73.71% at 195 °C in DMSO-C 2 DAIMF solvent. Furthermore, six CnDAIMF have a considerable effect on the conversion in water and 5-HMF yield of about 50% could be obtained, which is satisfactory compared with other similar processes, especially in the microwave system of aqueous solution. Therefore, this process may be benefit for many researches and applications related to functionalized ionic liquid research and biomass conversion applications.
研究领域:
化学工程
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生物质能
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2015
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IF 4.494
Jinping Ni,Na Teng,Haizhen Chen,Jinggang Wang,Jin Zhu,Haining Na
This work studied the hydrolysis behavior of regenerated celluloses (RCs) with different degree of polymerization (DP) by using the catalyst of dilute acid under microwave radiation. Results showed that the DP had a considerable influence on hydrolysis of cellulose. The reactivity of RCs was significantly improved when DP was lower than 51. The highest sugar yield of 59.2% was achieved from RC with lowest DP of 23 at 160 °C for 15 min. But the lowest yield of 32.6% was obtained when RC with highest DP of 132 was used. Recrystallization of cellulose was found to hinder the further hydrolysis particularly with the high DP. The effect of recrystallization can be reduced by the decrease of DP of RCs. This research demonstrates that the DP of RCs plays a crucial role on hydrolysis and it provides a preliminary guide based on DP to find a suitable pretreatment method for cellulose hydrolysis.
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
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2024
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IF 2.5
Xueling Hu,Yanling Zheng,Dhandapani Kuzhandaivel,Xiaohong Ding,Lixin Wu,Jianlei Wang,Xianliang Lin,Xiaoyong Hu,Xu Zhang
With the rapid development of the internet of things, the simple preparation of sensors has become a challenge. The present work presents the simple preparation of flexible sensors by using the fused deposition modeling (FDM) 3D printing combined with the microwave radiation-assisted treatment of the thermoplastic polyurethane (TPU) with carbon nanotubes (CNTs) as conductive fillers to create the flexible sensors. The as-prepared TPU/CNT composites exhibit the 7.27 MPa tensile strength and 401% elongation at break, similar to those of the pure TPU. After 200 tensile cycles, the TPU/CNT composites can still stably convert pressure into electrical signals, which can be used as flexible sensors with high sensitivity (0.879 kPa −1 ). In addition, shoe insoles and finger cover with sensing performance are fabricated through the FDM 3D printing technology, demonstrating the potential of the sensors to monitor human gait, finger straightening, and bending movements. The as-proposed method involves the embedding CNTs as conductive fillers on the surface of TPU to form the TPU/CNT composite conductive layers on the surface of TPU, which is beneficial for maintaining the elasticity of the polymer matrix. The challenges in preparing stable, low-cost, and scalable flexible sensors and highlights of the advantages of 3D printing technology in manufacturing flexible piezoresistive sensors are also deeply discussed.
研究领域:
材料科学
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传感器技术
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物联网
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2017
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IF 3.752
Longfei Tang,Shiwei Wang,Jifeng Guo,Xiuxiang Tao,Huan He,Li Feng,Songjiang Chen,Ning Xu
The removal mechanism of sulfoether in coal by microwave with peroxyacetic acid, was determined by evaluating changes in sulfur containing compounds after desulfurization by XANES and GC/MS. The highest occupied molecular orbital composition , the electrostatic potential distribution, and the sulfur containing bond dissociation energy (BDE) of model compounds molecules were also determined to support the experimental results. Results showed that sulfoether was easily oxidized to corresponding sulfoxide or sulfone in treated samples. Although benzyl sulfides were more readily oxidized than disulfides , the latter was easier to remove due to the higher breaking probability of the S S bond. The sulfur atoms within sulfur ether in coal are the active sites for electrophilic reaction . As sulfur atoms were oxidized, the sulfur containing BDEs decreased considerably and the dipole moments of sulfoether molecules increased. These findings suggest that the removal efficiency of sulfoether in coal may be improved by moderate and selective oxidation under microwave treatment.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 74
·39453-39462
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IF 3.708
Yani Yan,Qingbin Wu,Xiao Guo,Jinhua Lu,Zhen Hua Li,Yahong Zhang,Yi Tang
The highly selective isomerization and dehydration of various carbohydrates (glucose, xylose, cellobiose and cellulose) are one-pot conversions conducted in a simple borate-containing phosphate buffer solution (PBS) under microwave irradiation. It is demonstrated that the key to glucose converting into 5-hydromethylfurfural (5-HMF) with a high selectivity is matching the isomerization and dehydration processes of glucose at the appropriate boron/glucose mole ratio (B/G) and pH of PBS with the aid of microwave irradiation. Moreover, the interaction between borate and glucose in the isomerization process has been demonstrated by both Raman spectra and theoretical calculations. Furthermore, the reusability of such a PBS system with borate has been accomplished by the successive addition of glucose and by the continual removal of 5-HMF in a biphasic system. These results not only deepen the understanding of the isomerization and dehydration behavior of glucose, but also provide the possibility for practical applications, owing to the appealing green, inexpensive and sustainable characteristics of such a catalytic system.
研究领域:
生物化学
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催化化学
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可再生资源利用
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 47
·41108-41113
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IF 3.289
Hongyan Zhao,Guijie Mao,Huatao Han,Jinyi Song,Yang Liu,Wenyi Chu,Zhizhong Sun
As an outstanding mesh catalyst support, reduced graphene oxide (RGO) has attracted enormous attention in recent years. Cu nanoparticles-RGO (Cu NPs@RGO) as a green catalyst was prepared through a green reduction method by ascorbic acid in N-methyl-2-pyrrolidone. The structure of prepared Cu NPs@RGO was characterized. The catalytic activity of Cu NPs@RGO was estimated. A green and efficient method for synthesizing symmetrical biaryl compounds was developed by Cu NPs@RGO-catalyzed Ullmann homocoupling of aryl halides or arylboronic acids in ionic liquids under microwave (MW) irradiation. The catalytic system could be recycled five times with slight loss of activity. Through this method, nine kinds of biaryls were prepared by homocoupling reaction of the corresponding aryl iodides, aryl bromides, aryl chlorides and aryl boronic acids in moderate to good yields.
研究领域:
材料化学
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绿色化学
✓ 已验证
DOI
高影响因子
MONATSHEFTE FUR CHEMIE
·
2022
·Vol. 153
·期 3
·257-266
·
IF 1.613
Zhang Dawei,Ren Lu,Liu Ailing,Li Wenyu,Liu Yuxin,Gu Qiang
An efficient synthesis of 1,3,5-trisubstituted 1 H -pyrazoles was developed. 1,3,5-Trisubstituted-1 H -pyrazoles were synthesized starting from α , β -unsaturated aldehydes/ketones and hydrazine using catalyst H 3 [PW 12 O 40 ]/SiO 2 under microwave irradiation and solvent-free conditions (74–90%) and were characterized by HR-MS, FT-IR, 1 H NMR, and 13 C NMR spectroscopy. It was found that silica had a good loading and dispersing effect on phosphotungstic acid and could effectively absorb microwave energy to promote the condensation reaction. The merits of the method included the environmental friendly reaction conditions, simple operation, extensive substrates, good yields, and reuse of the H 3 [PW 12 O 40 ]/SiO 2 . Moreover, the crystal structure of compound 1-(4-chlorophenyl)-5-(2-methoxyphenyl)-3-(4-nitrophenyl)-1 H -pyrazole in triclinic P-1 space group was presented. Graphical abstract
研究领域:
有机化学
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绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）