STARCH-STARKE
·
2020
·
IF 2.226
Xue-Li Liu,Kun Zhang,Yu Hu,Zhengjuan Zhang,Jun Chen,TianLin Ma,JiaJia Wang
A new class of hydroxypropyl starch, γ-hydroxypropyl starch (γ-HPS), is synthesized by using 3-chloropropanol as the etherifying reagent. Two independent procedures for the determination of the number of moles of alkylene oxide combined per anhydroglucose unit (molar substitution, MS) in γ-HPS are described. The feasibility of the Zeisel-gas chromatographic technique and colorimetric determination are testified, and especially in the second approach, the stability and accuracy of dehydration process are also investigated. The concentrated sulfuric acid dehydration oxidation is replaced with 2-iodoxybenzoic acid oxidation while retaining the same acid degradation and the same ninhydrin color reaction. Furthermore, the reliability and the range of application of the methods are tested by analyzing three samples of γ-HPS and unmodified starch derivatives, and the results indicate that values of MS are in good agreement with each testing method.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Zixiang Hao,Yang Chen,Linrui Wang,Yuxuan Lu,Chengli He,Mingyan Wang,Xiaoli Cui
Elemental engineering has been employed to adjust molecular framework and electronic configuration of γ-graphyne for rapid lithium storage. Here, we construct a quasi-pyridinic nitrogen/sulfur co-doped γ-graphyne (N/S-GY) via a mechanochemical strategy and reveal its lithium storage behavior by quantitative kinetics analysis and theoretical calculations. The internal pyridinic-N atoms create rhombic channels for Li + passing through, while sulfur dopants anchored with alkynyl groups induce electron cloud rearrangement to facilitate intralayer Li + diffuse between C 12 -triangular channels and interlayer transfer through open rhombic channels. As a result, the as-prepared N/S-GY exhibits a high reversible capacity of 1003 mAh g −1 at 50 mA g −1 after 150 cycles, with Li + diffusion coefficient up to 2.6 × 10 −12 cm 2 s −1 , both of which are larger than that of N-doped γ-graphyne. This work highlights synergistic effect of sulfur and nitrogen co-doping in alkynyl carbon and inspires bottom-up heteroatom modification in framework design.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 4
·1110
·
IF 2.8
Shikang Zhao,Guohong Chen,Kaiqi Zheng,Shaojie Li,Jiaqi Xu,Fanan Wang,Xueping Liu,Rengui Weng
γ-Valerolactone (GVL) is a promising bio-based platform molecule with significant potential for energy applications. The production of GVL via biomass-based levulinic acid (LA) is an important reaction. To enhance the conversion and selectivity of non-precious-metal catalysts in the LA-to-GVL process and to better understand the key factors influencing this conversion, we conducted a series of experiments. In this study, supported Cu-Ni bimetallic catalysts (Cu-Ni2/Al2O3) were prepared using layered double hydroxides (LDHs) as a precursor. Compared with Cu-Ni catalysts synthesized via the conventional impregnation method, the Cu-Ni2/Al2O3catalysts exhibit higher catalytic activity and stability. The results demonstrated that efficient conversion was achieved with isopropanol as the hydrogen donor solvent, a reaction temperature of 180 °C, and a reaction time of 1 h. The yield of GVL reached nearly 90%, with a decrease of approximately only 6% after six consecutive cycles. The Cu-Ni2/Al2O3catalyst proved to be effective for converting biomass-derived LA to GVL, offering a route that not only reduces production costs and environmental impact but also enables efficient biomass-to-energy conversion.
研究领域:
催化化学
·
能源科学
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Fan Wang,Zehui Zhang
Catalytic transfer hydrogenation of the C═O bond has been considered to be one of the most important processes for the synthesis of fuels and chemicals. In this study, we have developed a metal-free transfer hydrogenation of furfural into furfuryl alcohol and some other valuable carbonyl compounds into alcohols as the hydrogen donors. Hydroxyapatite-encapsulated magnetic γ-Fe2O3 (γ-Fe2O3@HAP) acted as a magnetic base to promote this transfer hydrogenation with iso-propanol as the hydrogen donor. The catalytic performance of the γ-Fe2O3@HAP catalyst was greatly affected by the structure of alcohol. iso-Propanol was the best hydrogen donor for the transfer hydrogenation. In addition, the reaction temperature and the catalyst loading also affected this reaction. The highest yield of furfuryl alcohol reached 91.7% at a furfural conversion of 96.2%. Furthermore, this method was also useful for the transfer hydrogenation of other important carbonyl compounds into value-added chemicals and fuels. After the reaction, the γ-Fe2O3@HAP catalyst could be easily collected with the assistant of a magnet, and reused for six runs without the loss of its catalytic activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 1
·56-63
·
IF 2.172
Jie Zhang,Ben Dong,Jing Liu,Wuxu Yang,Sijie Ge,Shilong He
In this article, Mn doping on Ce-based γ-Al2O3 (i.e., Mn-Ce-γ-Al2O3) was synthesized and then employed as catalysts to study the removal of phenol from aqueous solutions through catalytic ozonation process. The results showed that the phenol removal was remarkably increased to 97.50% if Mn-Ce-γ-Al2O3 was adopted as the catalyst. In addition, the kinetic rate of the reaction was increased, approximately, about 1.49 times when using Ce-γ-Al2O3 catalyst with Mn doping. Moreover, X-ray diffraction, transmission electron microscopy, Brunner-Emmet-Teller measurements, and X-ray photoelectron spectroscopy techniques were used to comprehensively characterize the physicochemical properties of the synthesized Mn-Ce-γ-Al2O3 catalyst, including the phases, morphologies, textural properties, and dispersity of the surface active species. More uniform channel mesoporous structures were obtained after Mn doping on Ce-γ-Al2O3, which could enhance the gas-liquid mass transfer rate, surface hydroxyl groups, Ce3+/Ce4+ ratio, and the formation of Mn-Ce solid solution. In this study, the effects of Mn doping on Ce-based γ-Al2O3 on phenol degradation were investigated and the removal mechanisms were suggested for a better understanding of the improved removal efficiency.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Mingjing Yin,Shanshan Liu,Xinying Ma,Xiangyan Meng,Mingyong Chao
Eugenol, an active substance widely used in the medical, food, and cosmetic industries, has garnered increasing attention due to its potential adverse effects on human health resulting from excessive use. In this study, a sensitive sensor for the determination of eugenol was developed by electropolymerizing γ-aminobutyric acid ( g ABA) onto the surface of a glassy carbon electrode (GCE). Experiments showed that the poly γ-aminobutyric acid ( pg ABA) membrane exhibited excellent electrocatalytic activity for the oxidation of eugenol, and its oxidation peak current was greatly increased. Under optimized conditions, the oxidation peak current of eugenol was linearly proportional to its concentration in a range of 0.6–100 μmol/L, with a correlation coefficient of 0.9985 and a detection limit of 0.2 μmol/L. The sensor’s ability to detect eugenol in various authentic samples, with recovery rates ranging from 98.0 % to 101.3 %, attests to its great potential for practical application.
研究领域:
分析化学
·
生物医学工程
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2025
·
IF 3.3
Jinfeng Li,Nan Zhang,Qianwen Wang,Jianwei Zhang,Bo Tian,Zhigang Li,Haifeng Gu,Hongtao Zhao
The research for highly removal of uranium from nuclear waste is of significance for radionuclide remediation and environment. Herein, a robust pyrazolate-based metal-organic framework (NiBTP) is prepared by γ-irradiation through complexation between 1,3,5-tris(1H-pyrazol-4-yl) benzene (H 3 BTP) and Nickel (II) and presents efficient U(VI) adsorption performance. The synthesized NiBTP is characterized by XRD, FTIR, SEM, TEM, XPS and N 2 adsorption–desorption isotherm analysis. Structural characterizations demonstrate that NiBTP prepared by γ-irradiation possesses decreased BET surface area with hierarchical pore structure, but also has excellent crystallinity and high chemical stability. Batch experiments reveal that NiBTP adsorbent displays high adsorption capacity of uranium and excellent selectivity for UO 2 2+ ion in the presence of competing K + , Cs + , Sr + , Co 2+ , Mg 2+ , Ca 2+ , La 3+ and Eu 3+ ions. Thermodynamic investigation shows the adsorption process is endothermic and spontaneous. In addition, the adsorption mechanism of UO 2 2+ ion onto NiBTP is attributed to the hierarchical pore architecture as well as complexation. This study presents a simpler and more efficient alternative method for the preparation of pyrazolate MOFs and highlights the power of robust pyrazolate MOFs in sequestrations of radioactive pollutants from water environment.
研究领域:
材料科学
·
环境科学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2013
·Vol. 56
·期 6
·729-738
·
IF 1.327
Han JinDong,Ding JianXun,Wang ZhiChun,Yan ShiFeng,Zhuang XiuLi,Chen XueSi,Yin JingBo
Diethylamine, di- n -hexylamine, dicyclohexylamine and triethylamine have been used as initiators for the ring-opening polymerization of γ-benzyl- l -glutamate N -carboxyanhydride (BLG NCA) to synthesize poly(γ-benzyl- l -glutamate) (PBLG). The relationship between the molecular weight of PBLG and the molar ratio of monomer and initiator was studied. With dicyclohexylamine as initiator, the influence of monomer concentration, and reaction temperature and time on the polymerization of BLG NCA was examined. Three reagents were used for the deprotection of benzyl groups in PBLG, including hydrobromic acid/acetic acid (33 wt.%), NaOH aqueous solution and trimethylsilyl iodide (TMSI). Through examining the molecular weight of PLGA obtained using different deprotection methods, it was revealed that TMSI could minimize chain cleavage in the process of deprotection and retain the degree of polymerization. The biocompatibilities of PBLG obtained using different initiators were evaluated by a live/dead assay against L929 fibroblast cells. The in vitro cytotoxicities of PLGA obtained using different deprotecting agents were evaluated by a methyl thiazolyl tetrazolium assay. The results revealed that both PBLG and PLGA exhibited good biocompatibilities.
研究领域:
高分子化学
·
生物材料学
·
细胞生物学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Haixia Xing,Xinlei Li,Shupeng Sun,Baoyu Huang,Xiaogan Li
The γ-In 2 Se 3 /In 2 O 3 nanoflower-like heterojunctions were synthesized by solvothermal treatment followed by thermal oxidation in Air. The nanoflower-like γ-In 2 Se 3 /In 2 O 3 -based chemiresistive-type sensor showed a significantly enhanced response to NO 2 at an operating temperature of 170°C. The sensor achieves a response of 2.69–0.2 ppm NO 2 at 170°C. The sensor exhibits remarkable selectivity to several possible interferents such as carbon monoxide , ammonia, formaldehyde, acetone, methanol, and toluene, and good stability at 170°C. The nanoflower structure increases the specific surface area and introduces more active sites, which improves the sensitivity of the sensor to NO 2 . The heterojunction formed between γ-In 2 Se 3 and In 2 O 3 improves the charge carrier transfer between NO 2 gas molecules and sensing materials, thereby increasing the response of the sensor to NO 2 . Density functional theory was used to elucidate this sensing mechanism, and it was found that improved sensing performance is mainly due to heterojunction formation , which increases the adsorption energy of nitrogen dioxide molecules on a sensing material surface and facilitates charge transfer between molecules.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Jie Yang,Yong Liu,Jia Li,Min Zuo,Wenzheng Li,Ningning Xing,Chengyan Wang,Tingting Li
Micromotors have hold great promise for environmental remediation. Herein, we reported a novel γ-Fe 2 O 3 @Ag-mSiO 2 NH 2 magnetic Janus micromotor for dynamic removal of heavy metal ions and organic pollutants from water. The as-prepared Janus micromotors displayed unique core-shell structure composed of amino-functionalized meso‑SiO 2 shell and γ-Fe 2 O 3 magnetic core, and could be propelled by O 2 bubbles generated by Ag-catalyzed decomposition of H 2 O 2 . This Janus micromotor could move with a high velocity of 203.06 ± 10.6 μm s −1 (about 253.8 body lengths s –1 ) in 10 wt.% H 2 O 2 solution. γ-Fe 2 O 3 @Ag-mSiO 2 NH 2 magnetic Janus micromotor showed much higher removal capacities for Cu 2+ (15.59 mg g −1 ) and doxycycline (31.45 mg g −1 ) than its static control samples due to the synergy of self-propulsive movement and amino-functionalized porous core-shell structure. Furthermore, the magnetic γ-Fe 2 O 3 cores enabled the remote magnetic control on the movement direction and magnetic recycling. This work provides a new strategy for environmental pollutants treatment.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2018
·
IF 4.556
Yijia Yin,Qian Hu,Chenfeng Xu,Qi Qiao,Xianya Qin,Qingle Song,Yang Peng,Yongdan Zhao,Zhiping Zhang
A dual-sensitive nanoparticle delivery system was constructed by incorporating an acid sensitive hydrazone linker into thermosensitive nanoparticles (TSNs) for co-encapsulating doxorubicin (DOX) and interferon γ (IFNγ) and to realize the co-delivery of chemotherapy and immunotherapy agents against melanoma. DOX, a chemotherapeutic drug, was conjugated to TSNs by a pH-sensitive chemical bond, and IFNγ, a potent immune-modulator, was absorbed into TSNs through the thermosensitivity and electrostatics of nanoparticles. Consequently, the dual sensitive drug-loaded TSN delivery systems were successfully built and showed an obvious core–shell structure, good encapsulation efficiency of drugs, sustained and sensitive drug release, prolonged circulation time, as well as excellent synergistic antitumor efficiency against B16F10 tumor bearing mice. Moreover, the combinational antitumor immune responses of hydrazone bearing DOX/IFNγ-TSN (hyd) were strengthened by activating Th1-type CD4+ T cells, cytotoxic T lymphocytes, and natural killer cells, downregulating the expression levels of immunosuppressive cytokines, such as IL10 and TGFβ, and upregulating the secretion of IL2 and TNFα. Taken together, the multifunctional TSNs system provides a promising strategy for multiple drugs co-delivery with distinct properties.
研究领域:
肿瘤学
·
药剂学
·
免疫学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2017
·
IF 2.594
Jinwei Sun,Yujiang Wang,Haikui Zou,Xiaoguang Guo,Zhou-jun Wang
Nanosheet (S) and nanoplate (P) γ-Al 2 O 3 were synthesized by simple hydrothermal methods and employed as supports for Ni catalysts in CO 2 methanation . Both of the nanostructured Ni/Al 2 O 3 catalysts displayed good activity. In comparison, the Ni/Al 2 O 3 -S catalyst showed higher CO 2 conversion than the Ni/Al 2 O 3 -P counterpart at the reaction temperature ranging from 250 to 400 °C. The physical and chemical properties of the catalysts were systematically characterized by N 2 sorption , X-ray diffraction (XRD), high resolution-transmission electron microscopy (HR-TEM), hydrogen temperature-programmed reduction (H 2 -TPR) and CO 2 temperature-programmed desorption (CO 2 -TPD) techniques. Higher specific surface area and stronger metal-support interactions were confirmed on the Ni/Al 2 O 3 -S catalyst, which may lead to smaller particle size of Ni nanoparticles . Moreover, the Ni/Al 2 O 3 -S catalyst possessed more abundant weak and medium basic sites, which would benefit the activation of CO 2 . The smaller Ni size and more suitable basic sites may rationalize the superior activity of the Ni/Al 2 O 3 -S catalyst. Besides, the Ni/Al 2 O 3 -S catalyst exhibited excellent stability at 325 °C for 40 h.
研究领域:
化学工程
·
催化材料
✓ 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）