CHEMOSPHERE
·
2022
·
IF 8.943
Dongdong Liu,Dengqian Chen,Zhengkai Hao,Yibo Tang,Lipeng Jiang,Tianqi Li,Bing Tian,Cuiping Yan,Yuan Luo,Boyin Jia
In this work, a comparative study of efficient degradation of Rhodamine B (RhB) in CoFe 2 O 4 /H 2 O 2 and CoFe 2 O 4 /PMS systems was performed. Batch experiments indicated that the RhB degradation rate of CoFe 2 O 4 /H 2 O 2 system reached 95.5% at 90 min under the condition of 0.5 g L −1 of CoFe 2 O 4 dosage, 10 mM of H 2 O 2 concentration and 3.0 of initial pH. At certain conditions of initial pH = 7.0, 0.3 g L −1 of CoFe 2 O 4 dosage, 7 mM of PMS concentration, CoFe 2 O 4 /PMS system could completely degrade RhB within 90 min. EPR and quenching experiments indicated that •OH was the main active species of CoFe 2 O 4 /H 2 O 2 system, and •OH, SO 4 • - , •O 2 − and 1 O 2 participated in RhB degradation of CoFe 2 O 4 /PMS system. The circulate of Co(II)/Co(III) and Fe(II)/Fe(III) on the CoFe 2 O 4 surface promoted the formation of free radical species in the two system. In CoFe 2 O 4 /PMS system, the formed •O 2 − and SO 5 • - realized the generation of non-free radical species ( 1 O 2 ). The LC-MS results indicated that N -de-ethylation, chromophore cleavage, opening rings and mineralization were the main steps for the RhB degradation of the two systems. After five cycles of degradation experiment, the CoFe 2 O 4 /H 2 O 2 and CoFe 2 O 4 /PMS systems still maintained the high degradation rate (85.2% and 92.4%) and low mass loss (2.7% and 3.09%). In addition, CoFe 2 O 4 /PMS system had better potential value for the actual water and multi-pollutant degradation than CoFe 2 O 4 /H 2 O 2 system. Finally, the toxicity analysis and cost assessment of the two oxidation systems were preliminarily evaluated.
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高影响因子
POULTRY SCIENCE
·
2022
·
IF 4.014
Lingsen Zeng,Guiyun Xu,Caiyun Jiang,Junying Li,Jiangxia Zheng
ABSTRACT Eggshell color is the most intuitive external feature that affects consumer acceptance. Different eggshell colors are mainly determined by protoporphyrin IX and biliverdin content. The selection of eggshell color by the human eye with an eggshell color fan can be roughly classified. Although more technologically advanced, a colorimeter or spectrophotometer might be of limited use when observing a variety of shell colors, such as brown, olive, green, and blue. This study aimed to provide a convenient and accurate method for predicting the content of eggshell pigments by measuring eggshell color using the Commission International de L'Eclairage ( CIE ) L*a*b* system. The results showed the deepening of eggshell color in brown and blue eggs was correlated with increased eggshell pigment deposition, and eggshell color was significantly positively correlated with eggshell pigment content ( P < 0.01). Furthermore, the adjusted R 2 of the fitted function was in the range of 0.81 to 0.89, and the Spearman rank correlation coefficient between the predicted and true values was in the range of 0.89 to 0.93. In brief, the L*a*b* method of measuring eggshell color to predict the amount of eggshell pigment deposition is convenient, effective, and promising for layer production.
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高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2022
·Vol. 45
·期 4
·749-759
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IF 3.434
Zhang Xiao-guang,Xue Yu,Lu Ze-ping,Xu Hua-jin,Hu Yi
In this study, a series of proline ionic liquids with different lengths of hydrophobic alkyl on the side chain were used to modify the Candida Antarctic lipase B (CALB). The catalytic activity, thermal stability and tolerance to methanol and DMSO of the modified enzyme were all improved simultaneously. The optimum temperature changed from 55 to 60 ℃. The hydrophobicity and anion type of the modifier have important influence on the catalytic performance of CALB. CALB modified by [ProC 12 ][H 2 PO 4 ] has a better effect. Under the optimal conditions, its hydrolysis activity was 3.0 times than that of the native enzyme, the catalytic efficiency Kcat/Km improved 2.8 times in aqueous phase, and the tolerance to organic solvent with strong polarity (50% methanol 2 h) was increased by 6.8 times. Fluorescence spectra and circular dichroism (CD) spectroscopy showed that the introduction of ionic liquids changed the microenvironment near the fluorophores of the enzyme protein, the α-helix decreased and β-sheet increased in the secondary structure of the modified enzymes. The root mean square deviation (RMSD), residue root mean square fluctuation (RMSF), radius of gyration (Rg), and solution accessible surface area (SASA) of [ProC 2 ][Br]-CALB, [ProC 12 ][Br]-CALB and native CALB were obtained for comparison by molecular dynamics simulation. The results of dynamics simulation were in good agreement with enzymology experiment. The introduction of ionic liquids can keep CALB in a better active conformation, and proline ionic liquids with long hydrophobic chains can significantly improve the surface hydrophobicity and overall rigidity of CALB. This research offers a new idea for rapid screening of efficient modifiers and provision of enzymes with high stability and activity for industrial application.
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高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Xue Yu,Zhang Xiao-Guang,Lu Ze-Ping,Xu Chao,Xu Hua-Jin,Hu Yi
Various betaine ionic liquids composed of different chain lengths and different anions were designed and synthesized to modify Candida antarctica lipase B (CALB). The results showed that the catalytic activity of all modified lipases improved under different temperature and pH conditions, while also exhibiting enhanced thermostability and tolerance to organic solvents. With an increase in ionic liquid chain length, the modification effect was greater. Overall, CALB modified by [BetaineC16][H2PO4] performed best, with the modified CALB enzyme activity increased 3-fold, thermal stability increased 1.5-fold when stored at 70°C for 30 min, with tolerance increased 2.9-fold in 50% DMSO and 2.3-fold in 30% mercaptoethanol. Fluorescence and circular dichroism (CD) spectroscopic analysis showed that the introduction of an ionic liquid caused changes in the microenvironment surrounding some fluorescent groups and the secondary structure of the CALB enzyme protein. In order to establish the enzyme activity and stability change mechanisms of the modified CALB, the structures of CALB modified with [BetaineC4][Cl] and [BetaineC16][Cl] were constructed, while the reaction mechanisms were studied by molecular dynamics simulations. Results showed that the root mean square deviation (RMSD) and total energy of modified CALB were less than those of native CALB, indicating that modified CALB has a more stable structure. Root mean square fluctuation (RMSF) calculations showed that the rigidity of modified CALB was enhanced. Solvent accessibility area (SASA) calculations exhibited that both the hydrophilicity and hydrophobicity of the modified enzyme-proteins were improved. The increase in radial distribution function (RDF) of water molecules confirmed that the number of water molecules around the active sites also increased. Therefore, modified CALB has enhanced structural stability and higher hydrolytic activity.
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高影响因子
PHARMACEUTICAL DEVELOPMENT AND TECHNOLOGY
·
2022
·
IF 3.915
Ziyi Li,Zhenghua Li,Jianhua He,Jianping Liu
Salvianolic acid B (SAB) is a widely used cardioprotective agent, while its clinical application was limited by poor intestinal absorption and low oral bioavailability. In this study, SAB phospholipid (SP) complex was first prepared to improve the lipophilicity of SAB and then combined with d-glucose to further enhance intestinal absorption. Compared with free SAB, SP or the mixture of SAB and d-glucose, combination of SP and d-glucose showed higher intestinal absorption evidenced by increased effective permeation coefficient (Peff) in the in situ single-pass intestinal perfusion (SPIP) assay. Subsequently, SP and d-glucose at mass ratio of 1:6, with the highest Peff of SAB, were chosen for the preparation of complexed pellets to improve oral absorption efficiency of SAB. As expected, the obtained pellets significantly enhanced oral bioavailability of SAB in the pharmacokinetic study characterized by increasing Cmax and AUC0–t of SAB by 14.88-fold and 5.02-fold than free SAB, respectively. In conclusion, combination of d-glucose in SP pellets can effectively improve the intestinal absorption and oral bioavailability of SAB.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiao-Hui Yang,Guo-Hua Zhang
In this study, ultrafine borides powders including (W,Mo)B, (W,Mo)B 2.5 and (Mo,W)AlB were successfully fabricated via boronizing ultrafine W-Mo solid solution composite powder with B 4 C as the boron source under the assistance of Ca melt or Al melt. Ultrafine W-Mo solid solution powder was obtained by using a two-stage reduction route to reduce the precursor powder synthesized by spray drying. Meanwhile, the effects of Mo/W ratio on the phase composition, morphological characteristics and particle size distribution of boride solid solution composite powder were thoroughly investigated. The shift of diffraction peak in the XRD spectrum, the linear change of lattice constant and the homogeneous distributions of W, Mo, B and Al in the EDS energy spectrum comprehensively confirmed that the boride solid solution with different Mo/W ratios could be prepared. Due to the essentially insolubilities of W and Mo in Ca melt, the (W, Mo)B grains grew following a template growth mechanism, and inherited the nearly spherical morphology feature of ultrafine W-Mo solid solution composite powder with a particle size of approximately 200 nm. Nonetheless, as a result of the high solubilities of W, Mo, and B in Al melt, the process of dissolution-precipitation led to the formations of flaky (W, Mo)B 2.5 and short rod-shaped (Mo, W)AlB.
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高影响因子
Defence Technology
·
2023
·
IF 5.1
Jian Wang,Jie Chen,Yaofeng Mao,Yongjun Deng,Wei Cao,Fude Nie,Jun Wang
Metal (aluminum and boron) based energetic materials have been wildly applied in various fields including aerospace, explosives and micro-devices due to their high energy density. Unfortunately, the low combustion efficiency and reactivity of metal fuels, especially boron (B), severely limit their practical applications. Herein, multi-component 3D microspheres of HMX/B/Al/PTFE (HBA) have been designed and successfully prepared by emulsion and solvent evaporation method to achieve superior energy and combustion reactivity. The reactivity and energy output of HBA are systematically measured by ignition-burning test, constant-volume explosion vessel system and bomb calorimetry. Due to the increased interfacial contact and reaction area, HBA shows higher flame propagation rate, faster pressurization rate and larger combustion heat of 29.95 cm/s, 1077 kPa/s, and 6164.43 J/g, which is 1.5 times, 3.5 times, and 1.03 times of the physical mixed counterpart (HBA-P). Meanwhile, HBA also shows enhanced energy output and reactivity than 3D microspheres of HMX/B/PTFE (HB) resulting from the high reactivity of Al. The reaction mechanism of 3D microspheres is comprehensively investigated through combustion emission spectral and thermal analysis (TG-DSC-MS). The superior reactivity and energy of HBA originate from the surface etching of fluorine to the inert shell (Al 2 O 3 and B 2 O 3 ) and the initiation effect of Al to B. This work offers a promising approach to design and prepare high-performance energetic materials for the practical applications.
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Small
·
2023
·Vol. 19
·期 40
·2204119
·
IF 13.3
Huichao Liu,Sheng Zhu,Yu Zhang,Hua Song,Ying Zhang,Yunzhen Chang,Wenjing Hou,Gaoyi Han
Heteroatom-doped porous carbon materials with distinctive surface properties and capacitive behavior have been accepted as promising candidates for supercapacitor electrodes. Currently, the researches mainly focus on developing facile synthetic method and unveiling the structure-activity relationship to further elevate their capacitive performance. Here, the B, N co-doped porous carbon sheet (BN-PCS) is constructed by one-pot pyrolysis of agar in KCl/KHCO 3 molten salt system. In this process, the urea acts as directing agent to guide the formation of 2D sheet morphology, and the decomposition of KHCO 3 and boric acid creates rich micro- and mesopores in the carbon framework. The specific capacitance of optimized BN-PCS reaches 361.1 F g −1 at a current density of 0.5 A g −1 in an aqueous KOH electrolyte. Impressively, the fabricated symmetrical supercapacitor affords a maximum energy density of 43.5 Wh kg −1 at the power density of 375.0 W kg −1 in 1.0 mol L −1 TEABF 4 /AN electrolyte. It also achieves excellent long-term stability with capacitance retention of 91.1% and Columbic efficiency of 100% over 10 000 cycles. This study indicates one-pot molten salt method is effective in engineering advanced carbon materials for high-performance energy storage devices.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9395-9408
·
IF 4.5
Lin Yixuan,Qi Xiaoquan,Niu Guoqiang,Sun Qin,Ji Hongjun,Li Mingyu,Li Yufeng
Si 3 N 4 is a promising material for heat dissipation substrate due to its excellent thermal conductivity and mechanical properties. However, its application is limited by the difficulties in surface metallization. In this work, surface metallization of Si 3 N 4 ceramic substrate is realized by thick film method for the first time. Conductive silver paste containing Bi 2 O 3 -B 2 O 3 -ZnO glass frit as glass binder was prepared, and high-performance silver thick films were formed on Si 3 N 4 ceramic surface. The mechanical and electrical properties of silver films were significantly promoted with increasing sintering temperature, and silver films with high shear strength of 23.35 MPa and low resistivity of 3.41 μΩ·cm were obtained when sintered at 600 °C. In the meanwhile, the silver films exist high reliability under thermal cycles. The bonding between the silver thick film and Si 3 N 4 ceramic substrate was considerably enhanced as a result of interfacial reaction, forming Bi 2 Si 2 O 5 phase at the interface during sintering process. The formation mechanism was discussed and it is of great significance for the interfacial design in future studies. The results suggest that thick film method is a promising technology for obtaining high-quality surface metallization for Si 3 N 4 ceramic substrate. Graphical abstract
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiangrong Li,Ruonan Xu,Tianjun Ni
Flavonols are studied extensively because of their interesting biological activities. Galangin, kaempferol, quercetin, and myricetin are structurally related flavonols that differ only in the number of B-ring hydroxyl substituents. In this work, we have carried out a detailed study on the interaction of these structurally related flavonols and γ-globulin/fibrinogen/trypsin/pepsin by using experimental as well as molecular docking approaches. Studies show that the flavonol-protein complex is formed after the interaction of flavonols with the four proteins, which has moderate quenching and binding ability. The effects of the number and position of the hydroxyl groups in flavonols B-ring on the quenching constant, binding constant, number of binding sites, thermodynamic parameters as well as the changes of the secondary structure of proteins are elucidated. The interaction between flavonols and γ-globulin/fibrinogen/trypsin/pepsin is a spontaneous exothermic process driven by enthalpy and entropy, and the main force types are hydrophobic and hydrogen bonds. For some systems, electrostatic forces are also involved. The interaction of flavonols with the four proteins results in loosening and unfolding of backbone of proteins. Moreover, galangin and quercetin also reduce the hydrophobicity of the tryptophan (Trp) microenvironment. The secondary structure of γ-globulin/fibrinogen/trypsin is affected by the number of hydroxyl groups on the B-ring. Except that myricetin does not bind to the catalytic active center of pepsin and seems to have no inhibitory effect on the activity of pepsin, for other flavonol-fibrinogen/trypsin/pepsin systems, flavonols are bound to the active center of the three proteins, and have certain influence on the activity of them.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 7
·1481-1492
·
IF 1.8
Jia-Rong Xue,Rong-Chao Xue,Pei-Yao Chen,Yong Wang,Li-Ping Yu
In this study, a hydrostable Z-scheme Ag/CsPbBr 3 /Bi 2 WO 6 photocatalyst was designed and fabricated for the degradation of Rhodamine B (RhB). The structural instability of CsPbX 3 perovskites in water is one of the main obstacles that restrict their practical application in photocatalytic wastewater treatment. The photocatalyst was prepared in three steps: passivation of CsPbBr 3 nanocrystals (NCs) with 3-mercaptopropionic acid (MPA), construction of a heterojunction between MPA-passivated CsPbBr 3 NCs and Bi 2 WO 6 ultrathin nanosheets, and doping Ag nanoparticles as charge mediators in the heterojunction. The as-obtained 5%Ag/20%CsPbBr 3 /Bi 2 WO 6 exhibits good stability and excellent photocatalytic activity. The degradation rate is 93.9% in 120 min, which is 4.41 times than that of Bi 2 WO 6 .
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 134
·期 2
·1003-1015
·
IF 2.081
Chen Anna,Zhang Jin,Zhou Yi,Tang Haiqin
In this study, the MOF-5/BiOBr photocatalyst with microsphere structure was synthesized by hydrothermal method for the first time. The crystal structure, morphology, photoelectric performance and photocatalytic activity of the samples were characterized by XRD, SEM, TEM, XPS and electrochemistry. The results show that the synthesized MOF-5/BiOBr photocatalyst exhibits better photocatalytic performance than pure MOF-5 and BiOBr under simulated sunlight. The efficiency of Rhodamine B (RhB) removal based MOF-5/BiOBr composite (MOF-5 with mass ratio of MOF-5/BiOBr = 20 wt% of) reached 99.7%. The possible photocatalytic mechanism is discussed through the capture experiment of active species. The enhanced photocatalytic performance of the MOF-5/BiOBr composite may be related to the interaction between BiOBr and MOF-5 and the type II charge transfer path. The catalyst has simple preparation process, low cost, high activity under natural light, and high efficiency, and is expected to play a role in the treatment of environmental wastewater. This work provides a new insight for designing MOF-5 based photocatalyst.
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