Scientific Reports
·
2021
·Vol. 11
·期 1
·1-8
·
IF 4.38
Guo Zhenlong,Su YiFei,Li Kexin,Tang MengYi,Li Qiang,Xu Shandong
The development of detecting residual level of abamectin B 1 in apples is of great importance to public health. Herein, we synthesized a octopus-like azobenzene fluorescent probe 1,3,5-tris (5′-[( E )-( p -phenoxyazo) diazenyl)] benzene-1,3-dicarboxylic acid) benzene (TPB) for preliminary detection of abamectin B 1 in apples. The TPB molecule has been characterized by ultraviolet–visible absorption spectrometry, 1 H-nuclear magnetic resonance, fourier-transform infrared (FT-IR), electrospray ionization mass spectroscopy (ESI-MS) and fluorescent spectra. A proper determination condition was optimized, with limit of detection and limit of quantification of 1.3 µg L −1 and 4.4 μg L −1 , respectively. The mechanism of this probe to identify abamectin B 1 was illustrated in terms of undergoing aromatic nucleophilic substitution, by comparing fluorescence changes, FT-IR and ESI-MS. Furthermore, a facile quantitative detection of the residual abamectin B 1 in apples was achieved. Good reproducibility was present based on relative standard deviation of 2.2%. Six carboxyl recognition sites, three azo groups and unique fluorescence signal towards abamectin B 1 of this fluorescent probe demonstrated reasonable sensitivity, specificity and selectivity. The results indicate that the octopus-like azobenzene fluorescent probe can be expected to be reliable for evaluating abamectin B 1 in agricultural foods.
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PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 6
·3585-3598
·
IF 5.044
Zhang Sufeng,Zhao Mengke,Li Hao,Hou Chen,Du Min
In recent years, cobalt-based metal–organic frameworks (MOFs) have been used as catalytic materials to degrade organic contaminants in sulfate radical-based advanced oxidation processes (SR-AOPs). However, separating and recovering granular MOFs from the reaction system is difficult. Loading MOFs on the host material is currently the most effective way to promote their recyclability. Most reported aerogel materials are characterized by excessively long preparation and drying cycles. Considering this, herein, we report an in situ grown method to fabricate a ZIF-67/cellulose hybrid membrane, which was used as a catalyst for activating peroxymonosulfate to generate \({\text{SO}}_{4}^{ - }\cdot\) and · OH, resulting in the contaminants degradation. The catalytic results showed that the hybrid membrane/PMS system could degrade the methylene blue and rhodamine B within 1 min. In addition, the separation and recovery problems were solved. The ZIF-67/cellulose hybrid membrane with outstanding degradation of contaminants expands the application of MOFs/cellulose hybrid materials for wastewater purification via SR-AOPs. Graphic abstract
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 3
·2017-2028
·
IF 4.987
Zhang Zhenshu,Du Boyu,Zhu Hongwei,Chen Changzhou,Sun Yang,Wang Xing,Zhou Jinghui
To improve lignin depolymerization reaction performance of HZSM-5 zeolite catalyst, we reported the effective catalytic depolymerization of rice husk lignin (RHL) to lignin phenolic monomer (LP) products over the different Si/Al mole ratios of HZSM-5 zeolite catalyst. Firstly, five samples comprising different Si/Al mole ratio of HZSM-5 zeolite catalyst were prepared by the physical method. The X-ray powder diffraction (XRD), scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET), pyridine adsorption Fourier transform infrared spectroscopy (FT-IR), and temperature-programmed desorption of ammonia (NH 3 -TPD) were used to characterize various catalysts. Secondly, gas chromatography–mass spectrometry (GC-MS), 2D heteronuclear single quantum coherence (2D-HSQC), and gel permeation chromatography (GPC) were used to characterize various catalytic depolymerization products. The effect of different Si/Al molar ratios on the lignin conversion to LP products and the structural changes of residual lignin were analyzed. Finally, according to the results of LP products, we discovered that after the use of different Si/Al molar ratios of HZSM-5 zeolite catalysts, the content of acid in the different catalysts which increased with decreasing the Si/Al mole ratios. Among them, the A4P PM products (A4P: having a saturated or unsaturated aliphatic side chain in C4 position) increased from 0.58% (SA560, Si/Al: 560) to 1.83% (SA70, Si/Al: 70), the C6P PM products (C6P: having no side chain in C4 position of G, S, and H structure) increased from 1.53% (SA560, Si/Al: 560) to 3.41% (SA70, Si/Al: 70). Finally, the highest 6.05% PM products yield appeared in the SA70 (Si/Al: 70) catalytic system. It is worth noting that PM products produced by this HZSM-5 zeolite catalyst SA70 have great potential to be a promising renewable alternative to fossil resources. Graphical abstract
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 105
·期 16
·6333-6343
·
IF 4.813
Wang Wei,An Chunyan,Yao Yongpeng,Meng Xiangxi,Gao Shu-Shan
The industrially important meta -cresol ( m -cresol, 3-methylphenol) is mainly produced from fossil resources by chemical methods. The microbial production of m -cresol was rarely investigated. Herein, we constructed a platform for the overproduction of m -cresol in a modified fungus Aspergillus nidulans FGSC no. A1145 ∆ST∆EM , which gave a gram-level titer using starch as carbon resource. For the biosynthesis of m -cresol, the 6-methyl salicylic acid synthase (MSAS)-encoding gene patK and 6-methyl salicylic acid decarboxylase-encoding gene patG from A. clavatus were co-expressed in the host A. nidulans . Multiple strategies, including promotor engineering, gene multiplication, and fed-batch fermentation, were applied to raise the production of m -cresol, which resulted in the titers of 1.29 g/L in shaking flasks and 2.03 g/L in fed-batch culture. The chassis cell A. nidulans A1145 ∆ST∆EM was proved to possess better tolerance to m -cresol than yeast, as it could grow in the liquid medium containing up to 2.5 g/L of m -cresol. These results showed that A. nidulans has great potential to be further engineered for industrial production of m -cresol.
Key points
• m-Cresol was de novo biosynthesized by a fungal chassis cell Aspergillus nidulans.
• Promoter engineering and gene multiplication implemented the fine-tuned genes expression.
• The titer of m-cresol reached 2.03 g/L via fed-batch culture.
Graphical abstract
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 12
·6583-6592
·
IF 4.626
Yin Qingqing,Xu Fen,Sun Lixian,Li Yaying,Liao Lumin,Wang Tao,Guan Yanxun,Xia Yongpeng,Zhang Chenchen,Wei Sheng,Zhang Huanzhi,Li Bin
Polyethylene glycol (PEG) is widely used as phase change materials (PCMs). However, the leakage and low thermal conductivity issues restrict its practical application. Herein, a series of novel MWCNTs/HPC/PEG PCMs (named as PCM MHP ) have been synthesized by hydroxypropyl cellulose grafting onto PEG for the first time and doping multi-walled carbon nanotubes (MWCNTs). The results indicate that the PCM MHP exhibit excellent shape stability and without leakage keeping warm for an hour at 353.2 K. The melting and freezing enthalpy of the PCM M1HP7 is 134.7 J g −1 and 131.2 J g −1 , respectively; and corresponding melting point and crystallization temperature are about 324.9 K and 308.8 K, respectively. The PCM MHP show a good reversible thermal stability after 100 heating/cooling cycles. In addition, adding 4 mass% MWCNTs, the PCM M4HP7 possess a higher thermal conductivity of 0.6019 W m −1 K −1 , which is 2.1 times that of the PCM HP without MWCNTs (0.2895 W m −1 K −1 ) and 1.9 times that of pure PEG (0.3228 W m −1 K −1 ). In a word, the fabricated PCM MHP is a kind of shape-stabilized PCM and has good latent ability. It will have a broad potential application in thermal energy storage applications.
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 10
·9045-9056
·
IF 4.987
Liu Peng,Xu Junming,Li Jing,Zhou Minghao,Shang Shibin,Zhao Jiaping,Jiang Jianchun
Triglycerides is a kind of natural oil widely existing in animals and plants, and it is also an ideal raw material for preparing biomass liquid fuel. Selectively hydrotreatment of unsaturated glyceride is an important strategy for the production of fuels and chemical feedstocks. In this work, catalytic hydrotreatment of triglycerides over Ni-based catalysts was investigated. Thus, an array of metal–organic frameworks derived Ni@C catalysts synthesized under different temperatures (350 °C, 400 °C, 450 °C) were prepared and applied for hydrotreatment of triglycerides. The highest conversion of triglycerides was 98.9% and the cracking rate could achieve 4.61% over the optimal Ni@C-BTC-400 catalyst in cyclohexane at 320 °C. The physicochemical characterizations were carried out by means of powder X-ray diffraction, scanning electronic microscopy, thermo gravimetric analyzer, N 2 adsorption–desorption, and Raman. Based on the optimal reaction condition (320 °C, 3 h, 3.0 MPa H 2 ), five typical vegetable oils and gutter oils were selected for the hydrotreatment study to investigate the adaptability of Ni@C-BTC-400 catalyst. The result indicated that Ni@C-BTC-400 catalyst performed good universality, and could transform oil raw materials with different fatty acid carbon chain structure to desired alkanes. Furthermore, the optimal Ni@C-BTC-400 catalyst could be carried out in next two consecutive recycling runs and could also be regenerated by H 2 for the following experiments.
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Food Biophysics
·
2021
·Vol. 16
·期 4
·460-473
·
IF 3.114
Zhang Xiuling,Li Zhen,Ji Run,Li Kun,Zhang Wentao
Biodegradable composite films based on pullulan/carboxymethyl cellulose/nano-TiO 2 were prepared using a solution casting method. In this study, the composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and their physical, mechanical and antimicrobial properties were investigated. FTIR and XRD results confirmed that the presence of nano-TiO 2 could enhance the interaction between the film matrix. SEM analysis revealed that the composite films had a homogeneous network structure, and good particle dispersion could be obtained when the nano-TiO 2 particle content was low. DSC results indicated that the composite films possessed good thermal stability. The incorporation of nano-TiO 2 increased the thickness and contact angle while significantly decreasing the water solubility ( p < 0.05). As the content of nano-TiO 2 increased, the water vapor and ultraviolet visible (UV–Vis) light barrier properties of composite films were significantly improved ( p < 0.05). Mechanical analysis demonstrated that the tensile strength of the composite films first increased and then decreased, whereas the elongation at break decreased significantly ( p < 0.05). In addition, the composite films exhibited excellent activity against Escherichia coli and Staphylococcus aureus mainly due to the inactivation of bacteria by nano-TiO 2 photocatalysis. Preservation experiments showed that the composite films could decrease the weight loss significantly and maintain the firmness, titratable acidity, vitamin c and skin color of strawberries, thereby improving the overall quality of strawberries and extending their shelf life. This finding suggested that pullulan/carboxymethyl cellulose/nano-TiO 2 composite films possessed excellent potential for application in food packaging.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-9
·
IF 5.833
Zhang Wenxian,Li Xiuping,Cui Tianyu,Li Shenchang,Qian Yuqing,Yue Yu,Zhong Wenying,Xu Bo,Yue Wanqing
Using an ultrasonication-assisted liquid exfoliation method, we have synthesized PtS 2 nanosheets with good reproducibility. Herein, intrinsic peroxidase-like activity was for the first time demonstrated for PtS 2 nanosheets, which can catalyze H 2 O 2 oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to generate a colored solution. The catalytic mechanism of PtS 2 nanosheets was investigated, which indicated that acceleration of the electron transfer between TMB and H 2 O 2 was the main reason for the peroxidase-like activity of PtS 2 nanosheets. Based on these observations, we exploited PtS 2 nanosheets integrated into dopamine-functionalized hyaluronic acid (HA-DA) hydrogel microspheres by droplet microfluidics to construct PtS 2 nanosheet– and PtS 2 @HA-DA microsphere–based sensors for highly sensitive determination of H 2 O 2 . When coupled with glucose oxidase, we further developed two glucose sensors based on the above two methods. Among them, the linearity of the PtS 2 nanosheet–based spectrophotometry was in the range of 0.5 to 150 μM and the limit of detection as low as 0.20 μM. The linearity of the microsphere-based colorimetry was in the range 200 to 12,000 μM with a detection limit of 29.95 μM. Both of the glucose sensors can be applied to the determination of glucose in human serum with reliable results and reproducibility. Graphical abstract
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·562-573
·
IF 5.693
Cheng Xi Quan,Li Songwei,Bao Hongfei,Yang Xiaobin,Li Zhixing,Zhang Yingjie,Wang Kai,Ma Jun,Ullah Asmat,Shao Lu
The lack of highly permeable and selective separation membranes hampers the application of the energy-efficient membrane separation process for water remediation and CO 2 capture in molecular scale. Nanoparticles have been widely applied for tailoring pore structures and surface properties of the molecular separation membranes, thereby enhancing separation performance. However, limited by non-ideal nanoparticle aggregation, it remains a big challenge to fabricate such membranes on a large scale. Herein, we designed a kind of highly dispersed nanoparticles through grafting poly(sodium-p-styrenesulfonate) (PSS) on metal organic frameworks UiO-66 and deployed them for tailoring structure of polyelectrolyte membrane (PEM) for water remediation and Pebax (PEBA) symmetrical membranes for CO 2 capture, respectively. Because of electrostatic interaction, the PSS-grafted-UiO-66 (UiO-66-PSS) demonstrated nearly 100% dispersion in water and had an average particle size around 200 nm. Most interestingly, the introduction of the UiO-66-PSS finely tailored the affinity between membranes and target molecules, and the molecular structure of both PEM and PEBA membranes, thereby tripling the permeances of the membranes and slightly improving the selectivity of the membranes meanwhile. The PEM/UiO-66-PSS membranes demonstrated pure water permeance as high as 27.3 L m −2 h −1 bar −1 with MgSO 4 rejection above 98.7%. For CO 2 capture, the PEBA/UiO-66-PSS membranes exhibited 414.5 barrer with selectivity about 53.8. Taken together, the highly dispersed UiO-66-PSS shows strong promise in constructing molecular separation membranes with high separation performance for environmental remediation. Graphical abstract The highly dispersed PSS-grafted-UiO-66 finely tailored membrane structures of PEM membranes and the PEBA membranes and enhanced affinity between the target molecules and the aforementioned membranes, thereby tripling membrane permeances and improving the membrane selectivity slightly. The obtained PEM/UiO-66-PSS membranes and PEBA/UiO-66-PSS membranes show strong promise in water remediation and CO 2 capture, respectively.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 6
·2553-2560
·
IF 2.817
Cheng Zhenzhi,Liao Sen,Zhou Weiping,Luo Guangsheng,Huang Haifu
We developed a solid phase method to fabricate structurally ordered Pt 3 Co/C nanoparticles (NPs) with controllable component proportion as a high efficiency catalyst toward oxygen-reduction reaction. As a result, Pt 3 Co/C NPs exhibit high crystallinity with small average size and narrow size distribution. Moreover, the ordered Pt 3 Co/C NPs own enhanced ORR catalytic performance in acid. During the preparation process, the NaCl-matrix acts synergistically with carbon black as nanoreactors for Pt alloying with Co, avoiding serious sintering resulted by annealing at high temperature. Furthermore, other Pt-based NPs supported on carbon can also be prepared by this methodology.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 3
·669-678
·
IF 3.186
Niu Ling,Du Jianmei,Jiang Daochuan,Du Haiwei,Lin Xiangang,Xu Jiahui,Li Zhongjun,Zhu Chuhong,Gu Lina,Bi Hong,Yuan Yupeng
Carbon defects in graphitic carbon nitride (g-CN) can modulate the electronic structure for efficient separation of electron–hole pairs, and thereby potentially enhance the photocatalytic H 2 generation. However, the mechanism on the separation of electrons and holes in C defect-modified g-CN still remains unclear. Here we report an autogenic ammonia gas route via in-situ urea decomposition to create carbon defects in g-CN for realizing increased photocatalytic H 2 generation rate of 36.62 µmol h −1 under visible light exposure, which is 10 times higher than that of g-CN obtained in the absence of autogenic ammonia gas (~ 3.63 µmol h −1 ). Illustrated by the density functional theory calculations, the C defects can not only reduce the band gap for increased light harvesting, but also delocalize the π electrons in valence band (VB) and conduction band (CB) for efficient charge transfer. Such delocalization of π electrons facilitates the efficient separation of electrons in LUMO and holes in HOMO, then promoting the photocatalytic H 2 generation. Therefore, the creation of C defects can be used as an effective route to delocalize the π electrons in g-CN for efficient photocatalytic H 2 generation. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14128-14136
·
IF 2.478
Song Fengmin,Zhang Gongguo
A series of double-perovskite orange–red-emitting Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) phosphors have been synthesized via high-temperature method. The single-phase and orthorhombic structure of Ca 3 TeO 6 :Sm 3+ , Na + phosphors was confirmed by X-ray powder diffraction. Under 405 nm excitation, Ca 3 TeO 6 :Sm 3+ , Na + phosphors emitted a series of orange–red emission due to the transition of Sm 3+ from 4 G 5/2 to 6 H J/2 ( J = 5, 7, 9, and 11). The optimal Sm 3+ -doping concentration of Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) was x = 0.10. The thermal-quenching temperature of Ca 3 TeO 6 :0.10Sm 3+ , 0.10Na + phosphor was above 480 K. A white light-emitting diode (w-LED) based on 410 nm UV chip was successfully fabricated, and it presented a good correlated color temperature and a high color-rendering index (R a ). Therefore, orange–red-emitting Ca 3 TeO 6 :Sm 3+ , Na + phosphors have potential applications in UV-based w-LEDs.
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高影响因子
危险品化学品经营许可证（带存储）