Molecular Catalysis
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2022
·
IF 5.089
Yiqiang Liu,Yimei Qiu,Wenlong Jia,Zhiliang Shen,Zheng Li,Jiaren Zhang,Yong Sun,Xing Tang,Xianhai Zeng,Lu Lin
In this work, a porous Zirconium based coordination polymer (Zr-ATMP) was facilely synthesized at room temperature with amino tris(methylene phosphonic acid) (ATMP) as ligand, and the surface acidic sites could be adjusted in different solvents. Specifically, the coordination polymer with equivalent content of Bronsted and Lewis acid sites was synthesized in aqueous system, showing high-efficiency catalytic activity for fructose dehydration to 5-hydroxymethylfurfural (HMF). In comparison, the coordination polymer containing an abundance of Lewis acid sites was synthesized in DMF solvent, which efficiently catalyzed the transfer hydrogenation of HMF. Compared to the catalysts preparation in organic solvents, the coordinatively unsaturated Zr 4+ could be hydrated in water during catalyst preparation, resulting in the generation of additional Bronsted acid sites at the cost of Lewis acid sites. This contribution proposed a facile approach to prepare Zr-based coordination polymer with tunable acid properties for biomass valorization.
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高影响因子
ACS Applied Electronic Materials
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2022
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IF 4.494
Zhang Chen,Xiaotian Sun,Zizheng Wang,Yong Zhu,Chuanxiang Cao,Jiadong Zhou,Yanfeng Gao
Porous carbon was fabricated for broadband microwave absorption application, which was obtained from facile KOH activated carbon microspheres prepared from hydrothermal d-fructose. It is found that micropores (diameter < 2 nm) in the porous carbon played an important role in broadband and high microwave absorption properties. The prepared samples can achieve a wide bandwidth (the widest is 7.9 GHz, from 10.1 to 18 GHz), high dielectric loss (−60.0 dB as the best), and low thickness sensitivity (the bandwidth maintains 70% of the maximum within a film thickness fluctuation of up to 1.02 mm). Our findings offered an invaluable insight into designing and synthesizing highly microwave-absorbing materials through the micro/nanostructure.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
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2022
·Vol. 135
·期 4
·1957-1970
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IF 1.843
Wang Chengqian,Zhao Caiyi,Zhang Long
To enhance the selective fructose dehydration to 5-hydroxymethylfurfural (HMF), an efficient dehydration of fructose to 5-HMF in H 2 O-MIBK- pressured CO 2 in 20 min at 200 °C with a better product yield of 85.6% and 89.1% product selectivity was achieved. The high activity attributed to the combination of the weak acidity by CO 2 dissolved in the water and the efficient separation of fructose with 5-HMF in this H 2 O-MIBK two-phase system. The possible reaction mechanism is discussed. It was found that the solvents ratio was the one of key factors determining the yield of target products. Compared to the related reported results in the reaction, this process characterized of more favorable product yield and higher selectivity, it can be considered as a potential technique for the scale-up production of 5-HMF from fructose.
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高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 10
·2602-2612
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IF 6.813
Haosheng Xin,Haiyong Wang,Song Li,Xiaohong Hu,Chenguang Wang,Longlong Ma,Qiying Liu
Catalytic conversion of renewable cellulose, instead of fossil resources, to high-value ethylene glycol (EG) is of great significance for reducing considerable worries regarding the energy problem. However, the EG production from cellulose is dependent on Ni and Ru based catalysts. Herein, encapsulated Co@C catalyst was firstly applied for EG production from cellulose combined with tungstic acid (TA). The mixing of the two catalysts in different ratios was compared and well-controlled, and the highest 67.3% yield of EG can be achieved. TA is used mainly to promote both the cellulose hydrolysis and the retro-aldol reaction of glucose to glycolaldehyde. Co@C catalysts are responsible for the hydrogenation of glycolaldehyde to EG. Compared with traditional noble metals and composite catalysts, the inexpensive and easily synthesized Co@C catalysts could greatly reduce the cost of production of EG. The Co@C catalysts encapsulated with outside graphene layers can keep high stability for at least 6 runs.
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高影响因子
FOOD CHEMISTRY
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2022
·
IF 9.231
Dongmei Li,Zhiwei Zhu,Da-Wen Sun
Water is the most abundant component in fresh fruit and vegetables and its distribution and hydrogen bonding state in cells has a significant influence on food processing. In the current study, an improved method based on our earlier studies was developed to directly visualize the spatial distribution of content and hydrogen bonding state of water in apple and potato cells for the first time and the difference in water distribution in these cells was compared. Additionally, based on the distribution images of content and hydrogen bonding state of water in different regions in apple and potato tissues, the total water and free water contents, and the hydrogen bonding state of free water were quantified and compared with those obtained by nuclear magnetic resonance and Marinchik methods, demonstrating that the method could be successfully used for quantifying the content and hydrogen bonding state of water in fruit and vegetable cells.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 14
·6756-6764
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IF 3.925
Boyong Ye,Wenyang Zhang,Ruru Zhou,Yuanyuan Jiang,Zixin Zhong,Zhaoyin Hou
The dehydration of fructose to 5-hydroxymethylfurfural (5-HMF) is a crucial step in the biorefinery process, and finding a recyclable solid-acid catalyst and green solvent remains a challenge. In this work, a mesoporous sulfonated high-crosslinked polymer (abbreviated as SHCP) was synthesized following a facile route and used in the dehydration of fructose to 5-HMF in different solvents. The structure and properties of SHCP were characterized using N2 adsorption–desorption, XRD, Raman, SEM, TEM, FTIR, 13C CP/MAS NMR and XPS techniques. It was confirmed that SHCP possesses high surface area, uniform mesoporous and abundant sulphonic groups, and it can promote the dehydration of fructose to 5-HMF under mild reaction conditions. At the same time, the performance of SHCP in different solvents was tested in detail, it was found that SHCP exhibited similar initial activity in 1,4-dioxane/H2O mixture as that in dimethyl sulfoxide (DMSO), while the stability of SHCP in 1,4-dioxane/H2O mixture was enhanced obviously compared with that in DMSO. The reason for the deactivation of SHCP in different solvents was discussed, and it was disclosed that a small amount of water in DIO could depress the oligomerization of 5-HMF and enhance the stability of SHCP.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Xuemei Dong,Minhui Wang,Yecang Tang
A simple and green method for the synthesis of fluorescent carbon nanospheres (CNs) was proposed using chrysanthemum as a natural precursor and ethylenediamine as the co-reagent. The prepared CNs show strong blue fluorescence in water with quantum yield of 13.7 %, and distinguished fluorescent stability against photobleaching and ion strength. Meanwhile, the fluorescence signal of CNs is reversible and sensitive to temperature in the range of 20–80 °C, which makes CNs useful as a temperature sensor. More importantly, the CNs can serve as excellent fluorescent sensors for detecting MnO 4 − and Hg 2+ with the detection limit of 0.72 and 0.26 μM, respectively. MnO 4 − quenches the fluorescence of CNs through inner filter effect and static quenching mechanism, while Hg 2+ forms a stable complex with the amino group on the surface of CNs, resulting in the fluorescence quenching of CNs. However, the stronger affinity between Hg 2+ and captopril (Cap) results in the fluorescence quenched by Hg 2+ recovery after the addition of Cap. Thus, the CNs-Hg 2+ system is employed as a novel sensitive and selective fluorescence “turn-on” sensor for Cap in the range of 0–75 μM. Inspired by the sensing results, the developed sensors were successfully used for the determination of MnO 4 − , Hg 2+ in river water samples and Cap in the pharmaceutical and urine samples.
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PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Jianglong Liu,Luhan Yang,Shuang E,Caidi Jin,Chunxiao Gong,Kuichuan Sheng,Ximing Zhang
Corn stover derived hydrochar (HC) doped with aluminum nanoparticles was synthesized through the facile one-pot hydrothermal carbonization for glucose to fructose isomerization. Amorphous aluminum nanoparticles with crystalline size less than 0.5 nm were uniformly loaded on hydrochar. The phase of the Al-oxide nanoparticles was tailored through aerobic/anaerobic calcination. The results showed that the amorphous aluminum nanocrystals with six coordinated Al-oxide structure were formed under oxygen calcination, which facilitated the high catalytic activity and selectivity of glucose isomerization. It was found that catalysts prepared at hydrothermal temperature of 180℃ and further calcinated at 300℃ under aerobic condition (Al/HC 180 -300/O) achieved a fructose yield of 42.6% and a selectivity of 83.6% at 180 °C for 5 min. The kinetics, catalytic mechanism, and the deactivation mechanism of the glucose to fructose were further studied using Al/HC 180 -300/O catalyst. This study provides a high energy efficiency and low metal loading carbon-based catalysts synthetic approach applicable for biorefinery.
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高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2022
·Vol. 57
·期 6
·3385-3399
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IF 3.612
Yu Zhang,Kexin Li,Maobin Chen,Shangling Fang,Da Zhen,Jinghua Cao,Zhengqi Wu,Ke Zhang
Summary In this study, a novel chrysanthemum polysaccharide (CP) was obtained and investigated from Chrysanthemum morifolium tea in Hubei province, China. Molecular characterisation and emulsifying properties of the CP were elucidated. The effects of different factors, including storage time, metal ions, pH value and heat treatment, were studied on the stability of emulsion. Results showed that the mean particle diameter (MPD) ( d 32 ) varied from 5.54 to 0.49 μm with the polysaccharide concentration ranging from 0.5wt% to 3.0wt%. The MPD ( d 32 ) of emulsions stabilised by chrysanthemum tea polysaccharide (ECP) was smaller than that of GA at 2wt%, and the MPD ( d 32 ) of ECP remained stable with no stratification occurred at 25 °C for 10 days. ECP also showed good stability under acidic conditions (3.0–7.0). With increase of Na + and Ca 2+ concentration, MPD( d 32 ) and zeta potential values raised significantly, from 2.24 to 7.24 μm and from −40.52 to −35.35 mV respectively. After high-temperature heat treatment, MPD ( d 32 ) and zeta potential showed no significant change, indicating ECP presented good storage stability. In conclusion, CP helped stabilised emulsions that could be used as a natural emulsifier for future application.
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高影响因子
BIOMASS & BIOENERGY
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2022
·
IF 5.774
Gang Liu,Yujiao Xie,Chunjie Wei,Chang Liu,Feng Song,Xiuyu Sun,Yuan Zhang,Hongyou Cui
The one-pot approach was developed by using molten salt hydrate consisting of ZnCl 2 ·4H 2 O and LiCl·3H 2 O to produce 5-hydroxymethylfurfural (5-HMF) from cellulose . Cellulose was dissolved and regenerated to study the interaction of cellulose and molten salt hydrate. The effects of ZnCl 2 ·4H 2 O concentration, reaction time, and temperature on the conversion of cellulose to 5-HMF were investigated. 5-HMF yield increased when ZnCl 2 ·4H 2 O was mixed with LiCl·3H 2 O, and the maximum value (44.1%) was reached at 160 °C and 90 min when ZnCl 2 ·4H 2 O concentration was 64.9 mol%. The species of ZnCl 2 ·4H 2 O–LiCl·3H 2 O were analyzed, and the function of species concentration was correlated with the 5-HMF yield from the conversion of glucose and fructose. It was found that the synergistic catalysis of ZnCl 3 − , Zn 2+ , Zn(OH) + , H + as well as Li + promoted the efficiently cellulose conversion to 5-HMF.
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高影响因子
ENERGY
·
2022
·
IF 8.857
Shuang E,Caidi Jin,Jianglong Liu,Luhan Yang,Ming Yang,Enbo Xu,Kaiying Wang,Kuichuan Sheng,Ximing Zhang
The conversion of biomass to functional hydrochar based catalysts for sustainable biorefinery application is critical but still challenging. In this study, mild hydrothermal treatment combined with limited oxygen calcination was developed to treat corn stover and model components for directional preparation of hydrochar based catalysts. The prepared catalysts with various Al active species , exhibited high specific surface area, hierarchical pores, cross-linked carbon microspheres , and excellent catalytic and recycling performances for glucose isomerization . After optimization, a fructose yield of 35.1% (selectivity 77.4%) was obtained at 160 °C for 20 min and it was still more than 25% after the fourth recycling. The reaction kinetics for glucose isomerization was studied. This study established the physicochemical properties-performance relationships of hydrochar based catalysts. The optimized hydrothermal and calcination steps were crucial to improving performance by regulating the active sites and catalyst structures. Moreover, nitrogen, silicon and other elements coupled together could form functional compounds, which is vital for improving the catalytic performance by the synergy between support and Al active center. Three components in corn stover played distinct roles in the catalysis step. This study provides a novel way for developing efficient and recyclable catalysts from biomass, which could be applied in biorefining.
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高影响因子
Results in Chemistry
·
2022
·
IF 0
Kunlin Liu,Jia-Neng Tan,Yulei Wei,Changkun Li,Yuqing Dou,Zhongfeng Zhang
Deep eutectic solvents (DESs) are a recently developed class of green, efficient, and versatile alternatives to traditional organic solvents in natural product extractions. Inspired by the emergence of natural DESs and their green nature, we herein optimized the experimental variables for the extraction of dopamine from purslane ( Portulaca oleracea L., POL) using DESs. Nine choline chloride (ChCl)-based DESs were tested to select the optimum solvent for ultrasound-assisted extraction (UAE), and the combination of ChCl:glycerol (1:2) with 30% water extracted more dopamine from POL than ethanol. The amount of dopamine in the extracts was quantified by HPLC equipped with a fluorescence detector. The influence of UAE treatment on the morphology of plant material was studied by SEM. Based on single-factor experiments, the UAE conditions were optimized by response surface methodology using the Box-Behnken design. The optimum conditions were: extraction time of 30 min, water content in DESs of 32%, temperature of 58 °C, and plant material-liquid ratio of 40 mg/mL, which resulted in 2.96 mg of dopamine per 1 g of POL. The percentage of water in DESs and the extraction temperature were the most significant factors influencing the extraction efficiency of dopamine from POL. The results of this study promote the application of DESs for green and efficient extractions of bioactive alkaloids and other target molecules from plant materials.
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危险品化学品经营许可证（带存储）