RSC Advances
·
2022
·Vol. 12
·期 26
·16942-16954
·
IF 4.036
Yawei Zhan,Meixin Wang,Tengfei Ma,Zhiqiang Li
In this study, the effect of the γ-valerolactone (GVL)/H2O pretreatment system on bamboo (Neosinocalamus affinis) for enzymatic hydrolysis and ethanol fermentation was investigated. The performance characterization of the pretreated bamboo substrates, including the chemical composition, the structural characteristics, and the ability to produce bioethanol, were evaluated. The recovered substrates were enzymatically hydrolyzed for 48 h and then fermented to bioethanol. For the cellulose in the raw bamboo material, the highest cellulose-to-glucose conversion yield (CGCY) was achieved at 140 °C for 2 h with GVL : H2O = 8 : 2, which was 73.39%, and the cellulose-to-ethanol conversion yield (CECY) was 67.00%. This indicated that 183.5 kg of bioethanol could be produced per ton of bamboo, which was 9.71-folds higher than that directly converted from the untreated raw bamboo powder. Under these conditions, 50.60% of the active lignin can be recovered and be used as a wood-derived feedstock for further high-valued utilization. Meanwhile, the maximum concentration of fermentation inhibitors formed after pretreatment was about 140.9 mmol L−1, and had weak inhibition to the subsequent reaction. It has been shown that the cellulose could be effectively separated from bamboo and converted into bioethanol through the GVL/H2O pretreatment system.
研究领域:
生物能源
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Results in Physics
·
2021
·
IF 4.476
Shutong Hao,Xiaolin Liu,Mu Gu,Jiajie Zhu
γ-CuI is a promising scintillator owing to the ultrafast decay time of 130 ps contributed by the near-band-edge emission. The luminescence properties of the γ-CuI are directly related to its intrinsic defects, such as Cu and I vacancies. In this context, tuning the intrinsic defects by cation and anion doping was proposed to improve the scintillation performance of γ-CuI. The structural properties of the dopants, including Li, Na, Mg, F, Cl and Br, were investigated by first-principles calculations. The Li, Na and Mg atoms were calculated to occupy the Cu site. The Cl and Br atoms turned out to replace the I atoms. Importantly, the Cu vacancies were created by Cl and Br dopants, and the I vacancies were eliminated through Li, Na, Mg, Cl and Br doping. These theoretical results were demonstrated by photoluminescence and X-ray excited luminescence spectra.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Liming Dai,Chenchen Fang,Fanglei Yao,Xiaoyuan Zhang,Xuefeng Xu,Shangling Han,Jingyao Deng,Junwu Zhu,Jingwen Sun
In-situ generated hydroxides and oxyhydroxides have been gradually recognized as the real active sites of metal organic frameworks (MOFs) towards the oxygen evolution reaction (OER). Nevertheless, the fine phase evolution process is still less of concern and elusive. Herein, we successfully construct serious of Ni-MOFs with differing thickness ranging from 1 nm to 270 nm through a competitive coordination strategy. Utilizing the operando resonance spectroscopy, an accurate phase inversion behavior of the Ni-MOFs has been witnessed during the OER, and demonstrated as a thickness-dependent process. Ultrathin architecture is identified as a positive factor to promote the exchange between MOFs ligands and applied electrolyte during the electrochemical test. Hence, after removing most of the internal ligands, 2D MOFs favor to be transformed as β-NiOOH, which is more active than the generated γ-NiOOH in bulky system. The density function theory (DFT) calculation alongside with the in-situ electrochemistry tests further affirm the β/γ-NiOOH transformation behavior. This work offers a new understanding of the electrocatalytic mechanism from the view point of phase evolution in 2D MOFs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 36
·24944-24954
·
IF 3.9
Lin Li,Tao Zeng,Hongyu Huang,Jun Li,Noriyuki Kobayshi,Xiaohu Yang
In this study, the influences of nano γ-Al2O3 on the thermal storage performance of LiCl were experimentally investigated. The XRD results show that a complex of lithium aluminium oxychloride (LiAlOCl2) was formed through the LiCl·H2O and γ-Al2O3 composites preparation process. The in situ diffuse reflectance infrared Fourier transform spectroscopy measurement reveals that the addition of γ-Al2O3 accelerated the hydration rate of LiCl composites, concentrated the spectrum utilization range, and promoted the desorption rate of physical adsorbed H2O and low-frequency structural –OH in the materials. The highest specific surface area of the composite is 34.5 times higher than that of pure LiCl. The addition of γ-Al2O3 can increase the conversion rate of LiCl·H2O to approximately 100% at the hydration time of 1 h and the addition content of γ-Al2O3 at 15 wt%. A maximum heat storage density (HSD) for the LiCl·H2O-γ-Al2O3 composite can reach 714.7 kJ kgLiCl·H2O−1 in 1 h when the addition content of γ-Al2O3 was 15%wt and its water uptake can reach 0.26 g g−1 in 1 h. It also can be found that the addition of Al2O3 in LiCl resulted in a decrease of the activation energy from 90.89 kJ mol−1 to 79.76 kJ mol−1. However, the thermal conductivity of the LiCl·H2O-γ-Al2O3 composite slightly decreased with the increase of nano γ-Al2O3 content.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2015
·Vol. 7
·期 8
·1372-1379
·
IF 4.556
Xing Tang,Xianhai Zeng,Zheng Li,Weifeng Li,Yetao Jiang,Lei Hu,Shijie Liu,Yong Sun,Lu Lin
Graphical In situ generated catalyst system: HCl/ZrO(OH) 2 catalysts are prepared in situ by the autonomous decomposition of ZrOCl 2 ⋅ 8 H 2 O in levulinic acid (LA)/2-butanol solution. The esterification of LA was catalyzed in tandem with hydrocyclization to γ-valerolactone (GVL) by Meerwein–Ponndorf–Verley reduction. This is the first report of HCl/ZrO(OH) 2 catalysts prepared in situ by the autonomous decomposition of ZrOCl 2 ⋅ 8 H 2 O in levulinic acid (LA)/2-butanol solution, which catalyzed the esterification of LA in tandem with hydrocyclization to γ-valerolactone (GVL) by Meerwein–Ponndorf–Verley (MPV) reduction without the use of external H 2 . A maximum GVL yield of 92.4 % from neat LA and a GVL formation rate of 1092.2 μmol g −1 min −1 were achieved in 2-butanol at 240 °C in 2 h. The in situ generated ZrO(OH) 2 was characterized comprehensively and its unexpected catalytic efficiency was attributed mainly to its extremely high surface area. A crude LA stream from the acid hydrolysis of cellulose was extracted into 2-butanol and subjected to this catalyst system to give a GVL yield of 82.0 % even in the presence of humins.
研究领域:
化学工程
·
可再生能源
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Xingchang Cha,Juanjuan Ding,Wenyan Ba,Shengping You,Wei Qi,Rongxin Su
γ-Aminobutyric acid (GABA) is an inhibitory neurotransmitter with important physiological functions such as sleep assistance and anti-depression. In this study, we developed a fermentation process for the high-efficiency production of GABA by Lactobacillus brevis (Lb. brevis) CE701. First, xylose was found as the optimal carbon source that could improve the GABA production and OD600 in shake flasks to 40.35 g/L and 8.64, respectively, which were 1.78-fold and 1.67-fold of the glucose. Subsequently, the analysis of the carbon source metabolic pathway indicated that xylose activated the expression of the xyl operon, and xylose metabolism produced more ATP and organic acids than glucose, which significantly promoted the growth and GABA production of Lb. brevis CE701. Then, an efficient GABA fermentation process was developed by optimizing the medium components using response surface methodology. Finally, the production of GABA reached 176.04 g/L in a 5 L fermenter, which was 336% higher than that in a shake flask. This work enables the efficient synthesis of GABA using xylose, which will provide guidance for the industrial production of GABA.
研究领域:
微生物学
·
生物工程
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2021
·
IF 4.24
Wen Hedi,Liu Jingbo,Yu Yiding,Sun Yuxi,Liu Jiyun,Deng Qinqin,Chen Yan,Liu Boqun,Zhang Ting
Self-aggregation and the hemolytic effect limit the application of γ-cyclodextrin (γ-CD) in bioactive molecular delivery systems. In this study, γ-CD was modified by grafting onto bovine serum albumin protein (BSA), with epichlorohydrin (ECH) acting as the cross-linking agent. The effects of BSA concentration, reaction temperature, pH and time on the grafting rate were studied, and the γ-CD-BSA complex with a grafting rate of 99.5 ± 0.1% ± 0.06 ) % was achieved. The complex was confirmed using 1 H NMR and FT-IR spectra. Compared with γ-CD, the hemolytic effect and self-aggregation of γ-CD-BSA were significantly reduced, and the encapsulation efficiency of curcumin was increased by 10.8%. The results of scanning electron microscopy showed that both γ-CD and γ-CD-BSA nanoparticles were formed and the structure of the γ-CD-BSA complex was more uniform. The pH stability and salt stability of γ-CD-BSA were higher than γ-CD. The release rate of γ-CD-BSA was 15.2 ± 0.2% after 2 h at pH 1.2, and 57 ± 1% after 4 h at pH 7.2. The γ-CD-BSA nanoparticles could protect curcumin in acidic environments and release it in neutral environments. The results suggested a promising wall material for delivery of hydrophobic substances.
研究领域:
生物化学
·
药物递送系统
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2014
·
IF 1.189
Wanqin Jin,Liming Yang,Wei Yang,Bin Chen,Jie Chen
A novel method for grafting of 2-hydroxyethyl methacrylate (HEMA) onto the surface of stainless steel (SS) was explored by using 60 Co-γ irradiation. The surface of SS was modified by coating of dopamine before radiation grafting. The grafting reaction was performed in a simultaneous irradiation condition. The chemical structures change of the surface before and after grafting was demonstrated by Fourier transform infrared (FTIR) spectrometer. The hydrophilicity of the samples was determined by water contact angle measurement in the comparison of the stainless steel in the conditions of pristine, dopamine coated and HEMA grafted. Surface morphology of the samples was characterized by atomic force microscope (AFM) and scanning electron microscope (SEM). The corrosion resistance properties of the samples were evaluated by Tafel polarization curve. The hemocompatibility of the samples were tested by platelet adhesion assay.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Atmosphere
·
2022
·Vol. 13
·期 2
·333
·
IF 3.11
Chao Wang,Lingdong Kong,Shengyan Jin,Lianghai Xia,Jie Tan,Yuwen Wang
Soot and aged soot are often found to be mixed with atmospheric particles, which inevitably affect various atmospheric heterogeneous reactions and secondary aerosol formation. Previous studies have investigated the heterogeneous reaction of NO2with different types of soot, but there are few studies on the heterogeneous reaction of NO2with mixtures containing diesel soot (DS) or aged DS and mineral dust particles. In this study, the effects of DS and aged DS on the heterogeneous reaction of NO2on the surface of γ-Al2O3were investigated via in-situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS). The results showed that the DS or DS n-hexane extract significantly inhibited the formation of nitrate on γ-Al2O3particles and promoted the formation of nitrite. At 58% RH, with the increase of DS or DS n-hexane extract loading amount, the effect of DS or DS n-hexane extract on the formation of nitrate changed from promotion to inhibition, but DS or DS n-hexane extract always promoted the formation of nitrite. The results also showed that light was conducive to the formation of nitrate on the DS-γ-Al2O3or DS-n-hexane extract-γ-Al2O3particles. Furthermore, the influence of soot aging on the heterogeneous reaction of NO2was investigated under light and no light. In the dark, O3-aged DS-γ-Al2O3or O3-aged DS-n-hexane extract-γ-Al2O3firstly inhibited the formation of nitrate on the mixed particles and then promoted it, while the effect of aged DS on nitrite formation was complex. Under light, the O3-aged DS-γ-Al2O3firstly promoted the formation of nitrate on the mixed particles and then inhibited it, while the O3-aged DS-n-hexane extract-γ-Al2O3promoted the formation of nitrate on the mixed particles. Our results further showed that the production of nitrate on the O3-aged particles under light or no light was greater than that of the UV-nitrate-aged particles. This study is helpful to deeply understand the atmospheric chemical behavior of soot and the heterogeneous conversion of atmospheric NO2.Keywords:soot;NO2;heterogeneous reaction;aged soot;γ-Al2O3
研究领域:
大气化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Ning An,Lei Zhou,Wenli Li,Xiaoli Yuan,Li Zhao,Jingwei Huang,Yang Zhang,Houde She,Lei Wang,Qizhao Wang
Modifying semiconductor photoanode with efficient and cheap iron-based oxygen evolution cocatalyst along with functional interlayer is an efficient method to enhance the water splitting efficiency of photoelectrochemical (PEC). Poly-aminoanthraquinone (PDAAQ) due to its outstanding reversible redox activity plays a significant role as proton receptor. Herein, an easy-handle solvothermal method is adopted to prepare γ-Fe 2 O 3 -PDAAQ@BiVO 4 . With the concerted efforts of the ternary structure, the photocurrent of γ-Fe 2 O 3 -PDAAQ@BiVO 4 photoanode reach to 5.35 mAcm 2 at 1.23 V RHE (3.3 times of pure BiVO 4 ). The improvement is ascribable to the abundant catalytic active sites and large catalytic area of γ-Fe 2 O 3 nanoparticles . Additionally, theoretical calculations show that PDAAQ can form type II heterojunction with BiVO 4 to inhibit carrier recombination. At the same time, the role of PDAAQ in promoting water oxidation kinetics by accelerating proton coupled electron transfer process has also been confirmed in isotope effect experiment.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 28
·72354-72367
·
IF 5.8
Zhou Tao,Lu Linghong,Tao Suwan,Ma Yi
In this work, we synthesized activated alumina biochar composites (γ-Al 2 O 3 /BC) by sol–gel method, which improved the problem that the surface charge of γ-Al 2 O 3 was not conducive to the removal of heavy metal cation in a neutral solution, and then explored the feasibility of removing Pb(II) by γ-Al 2 O 3 /BC as well as reusing Pb-laden waste sludge to remove phosphorus (P) and its micro-adsorption mechanisms. The results show that the maximum adsorption capacity of γ-Al 2 O 3 /BC for Pb(II) is 182.48 mg/g, and the removing capacity of recycled Pb-laden slag for P also reaches 87.13 mg/g. It was found that the presence of Pb in the slag makes P removal more effective. In addition, in the process of P removal, the Pb in the slag will not be released, which will not cause secondary pollution to the water. The micro-adsorption mechanism of Pb(II) and P on the composites was investigated by XPS, XRD, and FTIR. It demonstrates that special functional groups such as hydroxy-aluminum, hydroxyl, and carboxyl groups can remove Pb(II) through strong surface complexation and electrostatic attraction. Furthermore, the removal mechanism of P from Pb-laden sludge includes chemisorption and complexation, and the precipitation of P and Pb on the adsorbent surface is the main reason for the removal of P. Therefore, it is feasible to further effectively remove P by using the waste biochar containing Pb. The idea of this paper provides a potential method for the reuse of waste adsorbent.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
H. Zhang,J. Xu,S. Wang,Q. Liu,X. Kong
Iron-based nanostructured materials are desirable for various applications owing to their high magnetization. Herein, we presented a facile fabrication of free-standing γ-Fe 2 O 3 nanosheets by a molten salt method for microwave absorption. Furthermore, Al component was incorporated to serve as the template for hole production. The designed holey γ-Fe 2 O 3 nanosheets were effective to maximize the usage of nanomaterials, thereby providing larger surface area, richer defects, and more polarization centers. Both experimental measurements and electric field simulation showed an enhanced capability for microwave absorption using holey γ-Fe 2 O 3 when compared with its intact counterpart. Oxygen vacancy was generated during the hole evolution, which significantly improved the electrical conductivity and thus promoted the conductive loss mechanism. In addition, the holey configuration may extend the transmission path of microwave and confer it with multiple reflection and scattering within the absorbent matrix. Meantime, the polarization loss was strengthened owing to Al modulation associated with the induced defect sites. With the improvement in conductive loss, polarization, impedance matching, and attenuation constant, the as-synthesized holey γ-Fe 2 O 3 exhibited promising microwave absorbability, with a maximum reflection loss of 52.4 dB and an effective bandwidth of 5.12 GHz at a thickness of 2.2 mm, overperforming most pure Fe-based materials.
研究领域:
材料科学
·
电磁学
✓ 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）