Nature Communications
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2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Peng Wei,Liu Jiaxin,Liu Xiaoqing,Wang Liqun,Yin Lichang,Tan Haotian,Hou Feng,Liang Ji
Electrocatalytic hydrogen peroxide (H 2 O 2 ) production via the two-electron oxygen reduction reaction is a promising alternative to the energy-intensive and high-pollution anthraquinone oxidation process. However, developing advanced electrocatalysts with high H 2 O 2 yield, selectivity, and durability is still challenging, because of the limited quantity and easy passivation of active sites on typical metal-containing catalysts, especially for the state-of-the-art single-atom ones. To address this, we report a graphene/mesoporous carbon composite for high-rate and high-efficiency 2e − oxygen reduction catalysis. The coordination of pyrrolic-N sites -modulates the adsorption configuration of the *OOH species to provide a kinetically favorable pathway for H 2 O 2 production. Consequently, the H 2 O 2 yield approaches 30 mol g −1 h −1 with a Faradaic efficiency of 80% and excellent durability, yielding a high H 2 O 2 concentration of 7.2 g L −1 . This strategy of manipulating the adsorption configuration of reactants with multiple non-metal active sites provides a strategy to design efficient and durable metal-free electrocatalyst for 2e − oxygen reduction.
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Nano Research
·
2023
·Vol. 16
·期 8
·10881-10889
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IF 9.9
Wei Xueer,Cheng Jiawei,Li Yubing,Cheng Kang,Sun Fanfei,Zhang Qinghong,Wang Ye
The noble metal-based bimetallic clusters with high atom utilization and surface energy have been widely applied in heterogeneous catalysis, but the stabilization of these metastable clusters in harsh reaction conditions is quite challenging. Herein, we synthesize a series of Pt-, Pd-, and Ru-based clusters promoted by a second non-noble metal (Zn, Cu, Sn, and Fe), which are confined inside silicalite-1 (pure silica, S-1) crystals by a ligand-protected method. The second metal could well stabilize and disperse the noble atoms inside the rigid S-1 zeolites via Si-O-M bonds, thus enabling to lower the usage of expensive noble metals in catalysts. The as-synthesized bimetallic catalysts exhibited excellent performance in non-oxidative propane dehydrogenation (PDH) reaction, which is typically operated above 500 °C. The PtZn@S-1, PtCu@S-1, and PtSn@S-1 with only a ∼ 0.17 wt.% Pt loading offer a significant enhancement in PDH performance compared with the conventional PtSn/Al 2 O 3 catalyst with a 0.5 wt.% Pt loading prepared by impregnation method. Notably, the PtSn@S-1 provides a propane conversion of 45% with a 99% propylene selectivity at 550 °C, close to the thermodynamic equilibrium. Furthermore, the PtSn@S-1 exhibits excellent stability during 300 h on stream and high tolerance to regeneration by a simple calcination step.
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Journal of Ocean University of China
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2023
·Vol. 22
·期 4
·1034-1040
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IF 1.6
Li Jiajing,Xue Changhu,Chang Yaoguang,Shen Jingjing,Zhang Yuying
Laminarinases reveal potential application in the field of food and biotechnology. In this research, a novel GH16 family laminarinase, designated as Lam16A_Wa, was cloned from the genome of marine bacterium Wenyingzhuangia aestuarii OF219 and expressed in Escherichia coli . Lam16A_Wa demonstrates a relatively low optimal reaction temperature (35°C) and a cold-adapted feature. Its optimal pH value is 6.0 and is stable in a broad pH range from 3.0 to 11.0. A glycomics strategy was employed to investigate the hydrolytic pattern of Lam16A_Wa. The enzyme was confirmed as a random endo-acting glycoside hydrolase. Its minimum substrate was laminarin pentasaccharide, and the major final products are oligosaccharides, including disaccharide to pentasaccharide. The Lam16A_Wa provides a novel and well-defined tool for the molecular tailoring of laminarin.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 107
·期 18
·5727-5737
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IF 5
Ye Ru-Yi,Song Juan,Zhang Zhi-Jun,Yu Hui-Lei
Abstract Cytochrome P450 monooxygenases CYP120As are the unique non-membrane P450s, which are extensively involved in retinoid biodegradation. As the O -functionalized 1,3,3-trimethylcyclohex-1-ene moiety exists in many bioactive compounds which could only be catalyzed by Class II P450s, exploration of the catalytic repertoire of CYP120As is therefore highly attractive. However, up to date, only one bacteriogenic candidate (CYP120A1) was demonstrated for the hydroxylation of C16 and C17 of retinoic acid, by utilizing the integral membrane protein cytochrome P450 reductase redox partner for the electron transfer. Herein, we provided an efficient prokaryotic functional expression system of CYP120As in E. coli by expression of the CYP120A1 coupled with several reductase partners. Fusion redox partners to the C -terminal of the heme-domain are also working on other CYP120A members. Among them, the fusion protein of CYP120A29 and FAD/FMN reductase from Bacillus megaterium P450 BM3 (CYP101A2) showed the highest expression level. Based on the available translational fusion systems, the regioselectivity and the substrate scope of the CYP120As have also been explored. This work represents a good starting point for further expanding the catalytic potential of CYP120 family. Key Points • Characterization of CYP120As in E. coli is firstly achieved by constructing fusion proteins. • The feasibility of three P450 reductase domains to CYP120As was evaluated. • Hydroxylated products of retinoic acid by six CYP120As were sorted and analyzed. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 39
·90936-90948
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IF 5.8
Lv
Yinzhi,Chen Lin,Zhang Anning,Sheng Guodong,Liao Qing
The separation and recycling of rare earth elements (REEs) are very important owing to the high demand, limited resource, specific usages, and environmental issues. In this work, two-dimensional Ti 3 C 2 T x MXene was introduced to remove REEs (Nd(III) and La(III)) from water, and its physicochemical properties were conducted by HRTEM, SEM–EDS, XRD, FTIR, and XPS. Various parameters, such as initial pH, REEs initial concentration, contact time, and temperature, were investigated by batch experiment, respectively. Furthermore, the adsorption kinetic and isotherm were examined to analyze the adsorption behavior and adsorption mechanism. Nd(III) and La(III) have a good affinity with Ti 3 C 2 T x MXene surface functional groups (-F, -OH, and containing oxygen groups). The maximum adsorption capacities of Ti 3 C 2 T x MXene for Nd(III) and La(III) were 229.85 mg/g and 175.83 mg/g at T = 333 K, respectively. The adsorption data of Nd(III) on Ti 3 C 2 T x MXene fitted well with the Freundlich isotherms model and pseudo-second-order kinetic model. However, the best fitting for La(III) adsorption on Ti 3 C 2 T x MXene was described by both pseudo-first-order and pseudo-second-order model. Thermodynamic study of Nd(III) and La(III) adsorption on Ti 3 C 2 T x MXene showed that the reaction was a spontaneous and endothermic process. These results indicated Ti 3 C 2 T x MXene had a great potential in extracting REEs from an aqueous solution.
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FIBERS AND POLYMERS
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2023
·Vol. 24
·期 9
·3007-3017
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IF 2.5
Chen Yatian,He Bin,Chen Qiufei,Malik Hamza,Zhu Hongqiang,Wang Yuhang,He Jian,Ma Bomou,Wang Xueli,Zhang Hui,Liu Yong
The effects of KBrO 3 modification on polyacrylonitrile (PAN) precursor fibers at different modification temperatures were studied. The mechanical properties, chemical structure, aggregation structure, morphological structure, and thermal behavior of PAN precursor fibers were analyzed. The mechanical properties of PAN precursor fibers are essentially unaltered after KBrO 3 modification, although oxygen-containing functional groups are introduced. KBrO 3 can ionize bromate ion in aqueous solution, which has good nucleophilicity and can attack the positively charged carbon atom in C≡N, so that the cyclization proceeds according to the ionic mechanism, allowing the transformation of C≡N to C = N in the PAN precursor fibers generated a cyclic trapezoidal structure containing primary aromatic amine, which reduced the peak temperature of the cyclization reaction from 284.5 °C to 275.1 °C and decreased the heat release. The sp3-hybridized carbon structure changes into a sp2 hybridized C = C structure with increasing aromatization, according to XRD and Raman data, and the KBrO 3 alteration accelerates the degradation of the original microcrystalline structure and transforms into a new polycyclic aromatic structure. The degree of conjugation and aromatization of the system rapidly increased with the rise in modification temperature. The stabilized fibers were discovered to have the lowest R-value, the highest aromatization, the smoothest surface, and the fewest flaws at impregnation temperature of 60 °C.
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International Journal of Minerals Metallurgy and Materials
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2023
·
IF 4.8
Zhao Xu,Zhong Shoudeng,Wang Shuqi,Li Shaozhen,Wu Sujuan
The commercialized poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) is usually used as hole transport layers (HTLs) in tin-based perovskite solar cells (TPSCs). However, the further development has been restricted due to the acidity that could damage the stability of TPSCs. Although the PEDOT:PSS solution can be diluted by water to decrease acidity and reduce the cost of device fabrication, the electrical conductivity will decrease obviously in diluted PEDOT:PSS solution. Herein, potassium thiocyanate (KSCN) is selected to regulate the properties of PEDOT:PSS HTLs from the diluted PEDOT:PSS aqueous solution by water with a volume ratio of 1:1 to prepare efficient TPSCs. The effect of KSCN addition on the structure and photoelectrical properties of PEDOT:PSS HTLs and TPSCs have been systematically studied. At the optimal KSCN concentration, the TPSCs based on KSCN-doped PEDOT:PSS HTLs (KSCN-PSCs) demonstrate the champion power conversion efficiency (PCE) of 8.39%, while the reference TPSCs only show a champioan PCE of 6.70%. The further analysis demonstrates that the KSCN additive increases the electrical conductivity of HTLs prepared by the diluted PEDOT:PSS solution, improves the microstructure of perovskite film, and inhibits carrier recombination in TPSCs, leading to the reduced hysteresis effect and enhanced PCE in KSCN-PSCs. This work gives a low-cost and practical strategy to develop a high-quality PEDOT:PSS HTLs from diluted PE-DOT:PSS aqueous solution for efficient TPSCs.
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Nano Research
·
2023
·
IF 9.9
Sun Yaru,Yu Bin,Liu Yan,Yan Junbo,Xu Zixi,Cheng Bo,Huang Fenglei,Wang Jun
High-performance flame-retardant polylactic acid (PLA) bio-composites based on biobased fillers to meet usage requirements represents a promising direction for creating a sustainable world. Although flame retardant PLA composites have been reported extensively, it still remains a huge challenge to develop mechanically robust. The flame retardant PLA composites due to plastication effect of organic flame retardants and poor compatibility of organic fillers with the matrix lead to the severe deterioration in mechanical properties. In this work, a bio-inspired surface manipulation strategy for halloysite nanotubes (HNTs) was proposed via a facile and green self-assembly process. The structure and morphology of bio-inspired HNTs (b-HNTs) proved that biomass nanofillers (PA-NA-Fe) grew well both within the lumen and on the surface of HNTs. The growth of biomass on the inner and outer surfaces of HNTs was inspired from wooden towards enhancing the interface compatibility and imparting multi-properties to PLA biopolymer. Excellent mechanical properties (tensile, thermomechanical and anti-impact mechanical), great fire safety (heat release and smoke emission), thermostability and improved electromagnetic interference shielding effectiveness of this well-designed PLA nanocomposite were realized. The mechanisms of the enhanced performances of the PLA bio-composites by loading b-HNTs were proposed. This work presents a facile and environmentally-friendly bio-inspired modification strategy for HNTs to fabricate high-performance, multi-functional polymer composites, which is also suitable for surface modification of many other nanomaterials, including nanofibers, nanotubes, nanowires, and nanosheets.
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Food and Bioprocess Technology
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2023
·
IF 5.6
Li Jiangfei,Zhou Yajun,Lu Weihong
Vacuum freeze drying (VFD) has been widely used for drying berries, by combining with pretreatment technology, energy consumption and cost can be effectively reduced as well as product quality improved. However, the effect of cold plasma pretreatment (CPP) on the drying efficiency and quality characteristics of VFD haskap has not been investigated. In this study, an innovative drying technology, cold plasma pretreatment–assisted vacuum freeze drying, was applied to process haskap. The purpose of the present study was to explore the effect of different times of CPP (0–75 s) on VFD haskap performance. The results indicated that the application of CPP enhanced the effective diffusion rate and drying rate (27.68%) owing to pretreatment etching larger and more cracks in the microstructure, increasing cell membrane permeability (15.59%), and altering cell wall pectin composition. Midilli is the most recommended model for drying kinetics. CPP contributed to increased hydrophilicity (25.33%) and degraded enzymatic activity, thereby prompting the enhancement of polyphenols, anthocyanins, flavonoids, and antioxidant capacity. Besides, the physico-chemical properties were ameliorated, the possible mechanism for the enhanced drying rate and quality properties of VFD haskap by CPP was explained by chemometrics. Overall, CPP is a promising pretreatment technology for haskap VFD.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 23
·1-12
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IF 2.8
Tian Lanlan,Hou Ruiting,Wang Shaozheng,Yu Ping,Li Yule,Chen Qingming,Zhang Hui
Perovskite manganite La 1 − x Ca x MnO 3 holds promising for uncooling infrared bolometers and magnetic sensors applications due to its unique properties such as metal insulator transition and colossal magnetoresistance. However, obtaining large temperature coefficient of resistance (TCR) value and magnetoresistance (MR) value in the temperature range close to room temperature remains a huge challenge. The dispersant can improve the agglomeration of particles in the precursor during the preparation of such ceramic materials, so that the uniformity of the samples is higher. In this study, we compare the effects of dispersants sodium dodecylbenzene sulfonate (SDBS) content on the structure, morphology, and electrical transport properties of La 0.67 Ca 0.33 MnO 3 (LCMO). We found that the ceramics with appropriate addition of SDBS possess higher density and larger grain size. Appropriate addition of SDBS can significantly improve the TCR and MR of the ceramics. The peak TCR reached 28.8%·K −1 ( x = 2%), and the peak MR reached 57.6% ( x = 4%). Our findings can promote the potential application of this material in infrared detect and magnetic sensors.
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FISH PHYSIOLOGY AND BIOCHEMISTRY
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2023
·
IF 2.9
Pan En-Zhuang,Xin Yue,Li Xue-Qing,Wu Xin-Yu,Tan Xue-Lian,Dong Jing-Quan
The aim of this study was to investigate the splenic tissue damage of environmental biological drug avermectin to freshwater cultured carp and to evaluate the effect of silybin on the splenic tissue damage of carp induced by avermectin. A total of 60 carp were divided into 4 groups with 15 carp in each group, including the control group fed with basic diet, experimental group fed with basal diet and exposed to avermectin (avermectin group), experimental group fed with basal diet supplement silybin (silybin group), and experimental group fed with basal diet supplement silybin and exposed to avermectin (silybin + avermectin group). The whole test period lasted for 30 days, and spleen tissue was collected for analysis. In this study, H&E staining, mitochondrial purification and membrane potential detection, ATP detection, DHE staining, biochemical tests, qPCR, immunohistochemistry, and apoptosis staining were used to evaluate the biological processes of spleen tissue injury, mitochondrial function, oxidative stress, apoptosis, and endoplasmic reticulum stress. The results show that silybin protected carp splenic tissue damage caused by chronic avermectin exposure, decreased mitochondrial membrane potential, decreased ATP content, ROS accumulation, oxidative stress, apoptosis, and endoplasmic reticulum stress. Silybin may ameliorate the splenic tissue damage of cultured freshwater carp caused by environmental biopesticide avermectin by alleviating mitochondrial dysfunction and inhibiting PERK-ATF4-CHOP-driven mitochondrial apoptosis. Adding silybin into the diet becomes a feasible strategy to resist the pollution of avermectin and provides a theoretical basis for creating a good living environment for freshwater carp. Graphical Abstract
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Science China-Technological Sciences
·
2023
·Vol. 66
·期 10
·2958-2967
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IF 4.6
Ren TingTing,Huang Lu,Xie ShangZhen,Chen GuoPeng,Liu Peng,Chen LinGen
Harvesting water from the air using adsorbents and obtaining fresh water by solar-driven desorption is considered as one of the most effective ways to solve the freshwater crisis in arid and desert regions. Based on a simple and low-cost photothermal hygroscopic hydrogel, a new strategy is proposed to boost solar energy efficiency by coupling solar-driven atmospheric water harvesting technology with thermoelectric power generation technology in this paper. Photothermal hygroscopic hydrogel ink PAM-CaCl 2 is prepared by in situ polymerization using Acrylamide as monomer, Ammonium persulfate as thermal initiator and CaCl 2 as hygroscopic component. During the day, the photothermal hygroscopic hydrogel absorbs solar energy and evaporates its own internal water to obtain fresh water. Simultaneously, the residual waste heat is utilized to power the thermoelectric panel, which produces electricity based on Seebeck effect. At night, the hydrogel harvests water molecules in the air to achieve regeneration. This hybrid system can achieve a water production rate of 0.33 kg m −2 h −1 and an additional electrical energy gain of 124 mW m −2 at 1 kW m −2 solar intensity. Theoretical model of the hybrid system is developed to understand the heat flow and thermoelectric generation process. The results provide new insights into energy and freshwater replenishment options in arid or desert areas with abundant solar energy.
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