CATALYSIS TODAY
·
2022
·
IF 6.562
Lidan Deng,Qiao Chen,Xingmao Jiang,Xiaowei Liu,Zheng Wang
Propane dehydrogenation is a promising way to produce propylene . Catalysts with high propane conversion, selectivity to propylene , and stability are vital to this technology. In this work, we determined that the catalytic performance of Pt/SBA-15 can be significantly enhanced by introducing an appropriate amount of indium . A too low ratio of In/Pt (1/8) or too high of a ratio (2/1) is detrimental to the activity of the catalyst. When the nominal ratio of Pt to In is 1/1, the initial propane conversion and selectivity towards propylene over 1Pt1In/SBA-15 are highest among all catalysts tested at 57.06 % and 99.04 %, respectively. The conversion rate decreased to 39.63 % after 28 h of reaction, but selectivity was retained at greater than 99 %. Very little coke was deposited on the used 1Pt1In/SBA-15 catalyst. With catalyst characterization, it was proposed that Pt 1 In 1 alloy nanoparticles with surface-enriched In 2 O 3 were responsible for the selective dehydrogenation of propane.
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Energy Storage Materials
·
2022
·
IF 20.831
Shuanghui Han,Zhenbang Li,Yuji Zhang,Danni Lei,Chengxin Wang
The practical application of rechargeable lithium metal batteries is limited by inhomogeneous lithium deposition and infinite side reactions. In practical scenarios, the temperature of the battery increases, which may aggravate side reactions and decrease the battery efficiency significantly. Herein, we report a unique lithium thermal reduction method for producing lithium-rich alloys from metal ethoxides. The uniformly distributed nanoscale Li–Al alloy in Li metal anodes can induce the uniform deposition of lithium metal and effectively inhibit side reactions. Therefore, the lithium rich alloy anode presents extremely low overpotential (5 mV) and cycles for 1000 h with no short circuit at the range of 30–60 °C under 0.5 mA cm −2 and 1 mAh cm −2 . When the anode is coupled with a commercial high loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (8.8 mg cm −2 ), a capacity retention of 72% is obtained after 490 cycles at 30 °C. Furthermore, the cell matched with a higher mass loading LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode (21.6 mg cm −2 ) maintained a high coulombic efficiency of 99.5% and a stable cycle for 300 h at 60 °C.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Ya zhu Wang,Jin Zheng,Muhammad Nawaz,Fan Yang,Jiajun Hu,Min-Tian Gao
In this study, it was found that soluble polysaccharides (SPs) from rice straw were conjugated with high levels of phenolic compounds . A gradient ethanol precipitation method was used to separate conjugates with different phenolic compound components. These conjugates were mainly composed of disaccharides or trisaccharides and phenolic acids that were mainly p- coumaric acid, ferulic acid, vanillic acid, and vanillin. SPs with more conjugates exhibited better effects on Saccharomyces cerevisiae and ethanol fermentation . The change in the proportion of conjugates in SPs significantly affected the accumulation of intracellular trehalose and glycerol content, indicating the effect of the conjugates on intracellular osmotic stress. Moreover, SPs with more conjugates generated lower intracellular hydrogen peroxide (H 2 O 2 ) levels. Thus, oligosaccharide and phenolic compound conjugates in SPs promoted yeast growth and ethanol fermentation. For instance, OD value reached 9.4, which was 1.3 times higher than the control group, and ethanol content at 36 h was 36.5 g/L, which was 1.3 times higher than the control. Osmotic pressure alleviation and lowered intracellular H 2 O 2 levels by conjugates are key mechanisms of the SPs during yeast growth and ethanol fermentation.
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高影响因子
Water
·
2022
·Vol. 14
·期 8
·1223
·
IF 3.53
Xiaoqun Zhang,Weiyou Zheng,Heng Zhang,Yi Chai,Guoliang Ruan
In order to understand the difference in muscle nutritional quality between yellow catfish (Pelteobagrus fulvidraco) cultured in in-pond raceway systems (IPR) and traditional ponds (TRP), two modes were used to culture the yellow catfish with the same initial body weight [average body weight (15.69 1 ± 2.28) g] for 60 days. The growth index, muscle texture characteristics, muscle nutritional components, amino acids and fatty acids of the fish were measured after the culture experiment. The results showed that the weight gain rate, specific growth rate and survival rate of IPR were significantly higher than TRP (p< 0.05). The hardness, elasticity, chewiness and resilience of the yellow catfish cultured in IPR were significantly higher than those cultured in TRP (p< 0.05). The crude protein content in the muscle of the yellow catfish cultured in IPR was significantly higher than that cultured in TRP (p< 0.01), while the content of crude fat and water was significantly lower (p< 0.01). The total amount of amino acids, essential amino acids and flavor amino acids of IPR were significantly higher than TRP (p< 0.01). The percentages of saturated fatty acids in muscle of the yellow catfish cultured in IPR and TRP were 3.59% and 3.83%, respectively, and the percentages of unsaturated fatty acids were 96.41% and 96.17%, respectively. It was concluded that the nutritional quality of yellow catfish cultured in IPR was better than that of fish cultured in TRP.Keywords:pond;catfish;water quality;growth;muscular texture;nutritional component
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Hongdong Song,Qingyu Wang,Aijing He,Sen Li,Xiao Guan,Yawen Hu,Siyi Feng
Hordein nanoparticles have been successfully fabricated to encapsulate EGCG. The present study aimed to investigate the effect of hordein nanoparticles encapsulation on antioxidant activity, storage stability and in vitro release of EGCG. The antioxidant activities of EGCG before and after encapsulation by hordein nanoparticles had no significant difference. The 28-day storage experiments indicated that EGCG-hordein nanoparticles had a good storage stability in terms of average diameter and zeta potential. Meanwhile, the stability of EGCG was significantly improved by hordein nanoparticles encapsulation. The remaining amount of encapsulated EGCG was 1.31-fold and 1.52-fold higher than that of free EGCG at 4 °C and 25 °C, respectively. The release study in the simulated gastric or intestinal fluids suggested that hordein nanoparticles could slow down the release of EGCG in the simulated gastric or intestinal fluids. These results showed that encapsulation of EGCG using hordein nanoparticles could be a promising approach to improve its stability.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Li Sun,Yuanyuan Diao,Yuejin Shan,Yuan Zhi,Hua Zhang,Binlin Dou,Weijia Huang
Based on a normal copper wire, an effective photocatalyst (ACW) for the 4-nitrophenol (4-NP) reduction is successfully synthesized by an in-situ redox method. The constitution of ACW is similar to “ants on a tree”, i.e., dense Au and Cu nanoparticles (NPs) are loaded on the copper wire surface covered by submicro-sized Cu cubes. Employing ACW as photocatalyst, the conversion efficiency of 4-NP can achieve to 100% at 2.5 min and the rate constant for the 4-NP reduction can reach up to 1.45 min −1 . Moreover, ACW exhibits satisfactory reusability for 25 cycles and stability in 12 months. These excellent performance can be attributed to the synergistic effect of Au NPs, Cu NPs and the Cu wire surface covered with submicro-sized cubes. Clearly, the above in-situ redox method provides a facile route to prepare metal NPs-supported bulk photocatalysts. Meanwhile, as-synthesized ACW can be a promising photocatalyst candidate for the practical treatment of 4-NP.
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MATERIALS & DESIGN
·
2022
·
IF 9.417
Bocheng Lei,Xiaobo Gao,Ran Zhang,Xin Yi,Qing Zhou
The development of a scaffold that can be quickly prepared and used to repair maxillofacial bone defects is an urgent clinical need. 3D printing technology can prepare personalized bone defect substitutes according to the computed tomography (CT) data of the patient's defect location. Magnesium is a bioactive molecule that plays an important role in the process of bone repair. In this study, different contents of magnesium phosphate (Mg 3 (PO 4 ) 2 ) were incorporated into polycaprolactone (PCL), and a bone defect repair scaffold was prepared using 3D printing technology. In vitro results showed that PCL scaffolds containing 20 % Mg 3 (PO 4 ) 2 (PCL#20MgP) had the strongest ability to promote osteogenic differentiation. Micro-CT and histological staining results of the repair of tibial defects in rats also further proved that the PCL#20MgP scaffold had strong bone formation ability in vivo . The PCL#20MgP scaffold was used to repair the rabbit maxillofacial bone defect. The Micro-CT results also confirmed that PCL#20MgP had a better osteogenesis effect than the PCL scaffold. The PCL#20MgP scaffold has good clinical application prospects in the field of maxillofacial bone defect repair.
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Green Energy & Environment
·
2022
·
IF 12.781
Daqiang Yan,Lin Zhang,Lei Shen,Runyu Hu,Weiping Xiao,Xiaofei Yang
Developing high efficient Pd-based electrocatalysts for oxygen reduction reaction (ORR) is still challenging for alkaline membrane fuel cell, since the strong oxygen adsorption energy and easy agglomerative intrinsic properties. In order to simultaneously solve these problems, Pd/Co 3 O 4 –N–C multidimensional materials with porous structures is designed as the ORR catalysts. In details, the ZIF-67 with polyhedral structure was firstly synthesized and then annealed at high-temperature to prepare the N-doped Co 3 O 4 carbon-based material, which was used to homogeneously confine Pd nanoparticles and obtained the Pd/Co 3 O 4 –N–C series catalysts. The formation of Co–N and C–N bond could provide efficient active sites for ORR. Simultaneously, the strong electronic interaction in the interface between the Pd and N-doped Co 3 O 4 could disperse and avoid the agglomeration of Pd nanoparticles and ensure the exposure of active sites, which is crucial to lower the energy barrier toward ORR and substantially enhance the ORR kinetics. Hence, the Pd/Co 3 O 4 –N–C nanocompounds exhibited excellent ORR catalytic performance, ideal Pd mass activity, and durability in 0.1 mol L −1 KOH solution compared with Co 3 O 4 –N–C and Pd/C. The scalable synthesis method, relatively low cost, and excellent electrochemical ORR performance indicated that the obtained Pd/Co 3 O 4 –N–C electrocatalyst had the potential for application on fuel cells.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 8
·5886-5898
·
IF 2.779
Tong Xingyu,Li Wei,Li Jiaying,Lu Shaowei,Wang Baichen,Ma Keming,Yang Chun,Li Qiuwen
Multi-component composite can effectively improve the electromagnetic interference shielding effectiveness (EMI SE) due to the synergistic effects. Herein, graphene aerogel (GA) provides a three-dimensional network framework and in situ generation of titanium dioxide (TiO 2 ) on its network layer by the sol–gel method. After microwave irradiation reduction, the titanium dioxide/microwave-reduced GA (TiO 2 /MRGA) was immersed in epoxy resin solution and cured to obtain its composite. The existence of the Ti–O–C bond proves the favorable combination of TiO 2 and MRGA. Under electromagnetic radiation, MRGA and TiO 2 generate a synergistic effect to improve the EMI SE of the composite. When the mass ratio of TiO 2 to MRGA is 1.5:1 (2.1 wt%+1.4 wt%), the composite exhibits a maximum EMI SE of 32.5 dB in the X band. Moreover, when the mass ratio of TiO 2 to MRGA is in the range of 1 to 1.8, the average EMI SE of the composites increases by 37% compared with that of the MRGA/Epoxy composite. The research indicates that this kind of EMI shielding composite has enormous application potential.
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Forests
·
2022
·Vol. 13
·期 1
·61
·
IF 3.282
Yuan Zhong,Yuhong An,Kebing Wang,Wanqi Zhang,Zichu Hu,Zhangjing Chen,Sunguo Wang,Boyun Wang,Xiao Wang,Xinran Li,Xiaotao Zhang,Ximing Wang
Heavy metal wastewater treatment is a huge problem facing human beings, and the application degree ofSalix psammophilaresources produced by flat stubble is low. Therefore, it is very important to develop high-value products ofSalix psammophilaresources and apply them in the removal heavy metal from effluent. In this work, we extracted the cellulose fromSalix psammophila, and cellulose nanofibers (CNFs) were prepared through TEMPO oxidation/ultrasound. The aerogel spheres derived fromSalix psammophila(ASSP) were prepared with the hanging drop method. The experimental results showed that the Cu(II) adsorption capacity of the ASSP composite (267.64 mg/g) doped with TOCNF was significantly higher than that of pure cellulose aerogel spheres (52.75 mg/g). The presence of carboxyl and hydroxyl groups in ASSP enhanced the adsorption capacity of heavy metals. ASSP is an excellent heavy metal adsorbent, and its maximum adsorption values for Cu(II), Mn(II), and Zn(II) were found to be 272.69, 253.25, and 143.00 mg/g, respectively. The abandoned sand shrub resource of SP was used to adsorb heavy metals from effluent, which provides an important reference value for the development of forestry in this sandy area and will have a great application potential in the fields of the adsorption of heavy metals in soil and antibiotics in water.Keywords:sandy shrub;cellulose;TEMPO;aerogel;adsorption
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AQUACULTURE
·
2021
·
IF 4.242
Hai-Feng Jiang,Cheng Chen,Xin-Yuan Jiang,Jing-Lei Shen,Fei Ling,Peng-Fei Li,Gao-Xue Wang
White spot disease caused by the white spot syndrome virus (WSSV) is a highly lethal infectious disease of crustacean aquaculture, with no effective means of control. Active compounds from herbal medicines are promising candidates for the development of antiviral agents for WSSV. We evaluated the efficacy of 12 herbal medicines in inhibiting WSSV proliferation in a WSSV infection model ( Procambarus clarkii ), Lonicera japonica extract had the strongest inhibitory effect on WSSV replication. Luteolin (LUT), the major bioactive compound of L. japonica extract, was further investigated and revealed to have a strong inhibitory effect on WSSV (96.04%, 50 mg/kg). LUT treatment decreased the WSSV load and the expression of important viral genes (immediate-early gene ie1 , DNA polymerase DNApol and envelope protein Vp28 ) in a dose-dependent manner and increased the survival of WSSV-infected crayfish by 60.00% (50 mg/kg). Co-incubation and time-of-addition assays revealed that LUT did not affect the infectivity of viral particles or viral absorption and entry. Expression of immune-related genes such as barrier-to-autointegration ( BAF ), heat shock protein 70 ( Hsp70 ) and signal transducer and activator of transcription ( STAT ), which may be beneficial for viral replication, were significantly decreased ( P < 0.01) in LUT-treated crayfish. LUT also modified the expression of antioxidants ( SOD , CAT and GST ), pro-inflammatory factor ( COX-1 and COX-2 ), and apoptosis-related ( BAX and BI-1 ) genes ( P < 0.01) to enhance antioxidant defenses, mitigate inflammation and induce apoptosis, respectively. Overall, LUT could be used as a prophylactic or therapeutic agent against WSSV infection in crustacean aquaculture.
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Foods
·
2023
·Vol. 12
·期 11
·2256
·
IF 5.2
Yachun Huang,Lin Zhang,Jielun Hu,Huan Liu
The objective of this research was to encapsulate probiotics by alginate hydrogel beads based on an in situ cultivation method and investigate the influences on the cell loading capacity, surface and internal structure of hydrogel beads and in vitro gastrointestinal digestion property of cells. Hydrogel beads were prepared by extrusion and cultured in MRS broth to allow probiotics to grow inside. Up to 10.34 ± 0.02 Log CFU/g of viable cell concentration was obtained after 24 h of in situ cultivation, which broke through the bottleneck of low viable cell counts in the traditional extrusion method. Morphology and rheological analyses showed that the structure of the eventually formed probiotic hydrogel beads can be loosed by the existence of hydrogen bond interaction with water molecules and the internal growth of probiotic microcolonies, while it can be tightened by the acids metabolized by the probiotic bacteria during cultivation. In vitro gastrointestinal digestion analysis showed that great improvement with only 1.09 Log CFU/g of loss in viable cells was found after the entire 6 h of digestion. In conclusion, the current study demonstrated that probiotic microcapsules fabricated by in situ cultivation method have the advantages of both high loading capacity of encapsulated viable cells and good protection during gastrointestinal digestion.Keywords:microencapsulation;probiotic;alginate;hydrogel beads;in situ cultivation
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