JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Feixiang Gong,Zhitao Fan,Wenke Xia,Meng Zhang,Lei Wang,Xudong Wang,Xinbing Chen
To produce high-performance and durable membranes used in diffusion dialysis (DD) for acid recovery, poly(arylene ether sulfone)s containing different N-cyclic quaternary ammonium (QA) cations (CardoPES-C 2 -R(Cl - )) were prepared, and the relationships between the N-cyclic QAs and the properties of the corresponding membranes were explored. The CardoPES-C 2 -R(Cl - ) membranes exhibited ultrahigh H + /Fe 2+ selectivity in DD that was higher than that of a commercial DD membrane and other reported DD membranes. Most importantly, both the acid dialysis coefficient (U H+ ) and the H + /Fe 2+ selectivity of the CardoPES-C 2 -R(Cl - ) membranes can be readily adjusted by regulating the chemical structures of functional groups. Interestingly, because of the hydrogen bonds proven by 1 H NMR, the CardoPES-C 2 -Mor(Cl - ) membrane displayed a higher acid permeability coefficient than other N-cyclic QA cation-based membranes with identical ion exchange capacity (IEC) values, but showed lower Cl - conductivity. Additionally, the CardoPES-C 2 -R(Cl - ) membranes exhibited excellent chemical and operational stability after aging testing and consecutive operation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Mengna Li,Na Li,Weiwang Qiu,Qian Wang,Jie Jia,Xueli Wang,Jianyong Yu,Xiaoran Li,Faxue Li,Dequn Wu
Infected wounds show delayed and incomplete healing processes and even render patients at a high risk of death due to the formed bacterial biofilms in the wound site, which protect bacteria against antimicrobial treatments and immune response. Nitric oxide based therapy is considered a promising strategy for eliminating biofilms and enhancing wound healing, which encounters a significant challenge of controlling the NO release behavior at the wound site. Herein, a kind of phenylalanine based poly(ester urea)s with high thermal stability are synthesized and fabricated to electrospun films as NO loading vehicle for infected wound treatment. The resultant films can continuously and stably release nitric oxide for 360 h with a total concentration of 1.15 μmol L −1 , which presents obvious advantages in killing the bacteria and removing biofilms. The results exhibit the films have no cytotoxicity and may accelerate the wound repair without causing inflammation, hemolysis, or cytotoxic reactions as well as stimulate the proliferation of fibroblasts and increase the synthesis of collagen. Therefore, the films may be a suitable NO releasing dressing for removing biofilms and repairing infected wounds.
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高影响因子
Foods
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2021
·Vol. 10
·期 10
·2328
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IF 4.35
Yuanpeng Hao,Jingyi Li,Wenying Zhang,Meiyu Sun,Hui Li,Fei Xia,Hongxia Cui,Hongtong Bai,Lei Shi
The use of antibiotics in the food industry is highly regulated owing to the potential harmful effects of antibiotics on human health. Therefore, it is crucial to seek alternatives for ensuring food safety. Essential oils (EOs) extracted from plants of the genusOriganumexhibit a wide range of chemical and antibacterial activities. Species and tissue factors shape the production and accumulation processes of EOs inOriganumplants, thereby affecting their bactericidal activity. In this study, the morphologies and EO yields from the inflorescences, leaves, and stems of three oregano cultivars were evaluated. In addition, the chemical compositions and antibacterial abilities of oregano EOs (OEOs) were assessed. The results showed that OEOs from the different parts of the plant displayed only minor differences in chemical composition, whereas the yield of EOs varied considerably. Additionally, the chemical profiles of OEOs differed significantly among cultivars. The carvacrol content in the OEOs was closely related to its activity againstStaphylococcus aureus; the antibacterial properties of the OEOs were further verified using carvacrol. These findings suggested that OEOs possessing high antibacterial activity may have the potential to be developed as bactericides in the food industry.Keywords:oregano essential oil;chemical composition;carvacrol;antibacterial activity;food safety
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shizong Wang,Jianlong Wang
High efficient activator is highly desired in the field of persulfate-based advanced oxidation process. In comparison with the previous studies, this study adopted nitrogen, sulfur and oxygen co-doped carbon material to support Fe 0 encapsulate in Fe 3 O 4 to prepare iron-based modified carbon composite (Fe 0 @Fe 3 O 4 -MC) by a facile two-step pyrolysis. Fe 0 @Fe 3 O 4 -MC was then used for degradation of sulfamethoxazole. The results showed that Fe 0 @Fe 3 O 4 -MC had superior catalytic activity for PMS activation due to the synergistic effect of iron-based compound and modified carbon. In the presence of 0.1 g/L of Fe 0 @Fe 3 O 4 -MC, SMX (0.04 mM) could be completely degraded within 120 min at pH 3.4 and 3 mM of PMS. The SMX degradation followed pseudo first-order kinetic model, with the rate constant of 0.12 min −1 , and the mineralization of SMX achieved 48.4%. Sulfate radicals dominated in the SMX degradation. In addition to Fe 0 and Fe 3 O 4 , carbon defects, graphitic N, sulfur and FeN 4 also contributed to PMS activation. Fe 0 oxidation was the rate-limiting step for PMS activation. Dissolved oxygen made a minor contribution to Fe 0 oxidation. The intermediate products of SMX degradation were identified, and two pathways of SMX degradation were proposed. The influencing factors on SMX degradation were studied, including pH, temperature, PMS concentration, Fe 0 @Fe 3 O 4 -MC dosage, chloridion, carbonate and humic acids, and the influencing mechanism was discussed. This study could provide an efficient PMS activator for the degradation of emerging organic pollutants in water and wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Shenghe Zhang,Fukai Chu,Zhoumei Xu,Yifan Zhou,Yong Qiu,Lijun Qian,Yuan Hu,Bibo Wang,Weizhao Hu
Herein, three different phosphorus-containing compounds (methyl phosphoryl dichloride, phenyl phosphoryl dichloride and phenyl dichlorophosphate) were reacted with 2-aminobenzothiazole respectively, and a series of synergistic flame retardants with phosphorus, nitrogen and sulfur elements were synthesized, named MPBT, PPBT and POBT respectively. Then, they were added to prepare flame-retardant flexible polyurethane foam (FPUF). Through the analysis of thermal stability, pyrolysis, heat release and smoke release behavior, the influence of different phosphorus-containing structures on the flame-retardant performance of FPUF was studied, and their flame-retardant mechanism was explored in detail. Among them, MPBT had the highest flame retardant efficiency with the same addition amount (10 wt%). The limiting oxygen index (LOI) value of PU/10.0% MPBT reached 22.5 %, and it successfully passed the vertical burning test. Subsequently, the addition amount of MPBT was increased and the best comprehensive performance of flame-retardant FPUF was explored. The results showed that the LOI value of PU/15.0% MPBT was increased to 23.5%. As for PU/15.0% MPBT, the peak heat release rate (PHRR) was 453 KW/m 2 , which was reduced by 46.64 %; and the flame retardancy index (FRI) value was also increased to 6.88. At the same time, the mechanical properties of flame-retardant FPUF were studied. The tensile strength of PU/15.0% MPBT reached 170 KPa, and the permanent deformation of FPUF/10% MPBT was only 4 %, showing its excellent resilience. The above results show that this phosphorus-containing element hybrid synergistic flame retardant (MPBT) has a very good application prospect in the field of flame-retardant polymer materials.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Congcong Piao,Yitong Lin,Zhiyu Liu,Liang Chen,Jianhe Tang,Dawei Fang,Jun Wang
ABSTRACT Several novel Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 . Sodium borohydride (NaBH 4 ), ascorbic acid (C 6 H 8 O 6 ) and hydrazine hydrate (N 2 H 4 ·H 2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst prepared by using NaBH 4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO 3 2- and electrons are momentous for the conversions of NO 2 - and NO 3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 caused by Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst is proposed.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Xinan Shi,Yuxiang Wang,Hui Yu,Gang Wang,Lijian Huang,Daocheng Pan
The crystal quality of a Cu2ZnSn(S,Se)4 (CZTSSe) thin film is crucially important to a high-performance CZTSSe solar cell. After selenization, a bilayer CZTSSe thin film consisting of a large-grain top layer and a small-particle bottom layer is usually observed according to the literature. In this work, a facile air-annealing pretreatment is conducted for a Cu2ZnSnS4 precursor thin film prior to selenization, which can lead to sodium diffusion into the CZTS precursor thin film and surface oxidization of the CZTS thin film. Our experimental results revealed that the Na prediffusion and the surface oxidation of the CZTS precursor thin film can significantly promote the crystal growth of the CZTSSe thin film, which can completely remove the small-particle bottom layer and form a large-grain-spanned CZTSSe thin film. As a result, a photoelectric conversion efficiency of 9.80% was achieved by this method.
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高影响因子
Frontiers in Physiology
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2020
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IF 3.367
Gao Haiming,Dai Lulu,Fu Danyang,Sun Yaya,Chen Hui
The Chinese white pine beetle (Dendroctonus armandi) is undoubtedly one of the most important pests causing ecological damage in the Qinling Mountains. When bark beetles invade conifers, they must overcome host tree defenses, including primary resistance and induced resistance responses. Moreover, this induced resistance occurs following herbivory by bark beetles. Bark beetles have a corresponding defense mechanism for degrading toxic compounds, and glutathione S-transferases (GSTs) can catalyze the binding of endogenous substances that reduce glutathione (GSH) to various harmful electrophilic substrates, increasing their solubility and facilitating their excretion from cells. In this experiment, we successfully obtained sixteen full-length sequences of D. armandi, which belonged to four GST categories (delta, epsilon, sigma, and theta). The transcript levels of sixteen GSTs in D. armandi were compared at four developmental stages (larvae, pupae, teneral adults, and adults), three different tissues (antennae, gut, and reproductive organs), and under various levels of terpenoid stimuli during feeding on phloem tissue to evaluate the various relevant modes of action. This study aids in the understanding of the interaction between monoterpenes and beetles, and beetles’ detoxification through GSTs.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
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IF 4.192
Zi-Han Wei,Miao Liu,Chao Hu,Xue-Qing Yang
Analysis of the glutathione S-transferase (GST) gene expression in an insecticide-resistant strain of Cydia pomonella using real-time quantitative polymerase chain reaction is a key step toward more mechanism studies that require suitable reference genes with stable expression. Here, nine commonly used reference genes were selected, and their expression stabilities were analyzed. Results showed that EF-1α was the most stable reference gene in all of the experimental sets. The combinations of EF-1α and 18S, EF-1α and RPL12, and EF-1α and GAPDH were sufficient for normalization of gene expression analysis accurately in developmental stages, tissues, and larvae exposed to sublethal dose of λ-cyhalothrin, respectively. Additionally, the suitability of particular reference genes was verified by analyzing the spatiotemporal and insecticide-induced expression profiles of CpGSTe3, CpGSTd3, and CpGSTd4, which were overexpressed in a λ-cyhalothrin-resistant population from northeast China. These genes were used to confer the practicability of reference genes chosen in this study.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yongkun Liu,Guohua Jiang,Bo Yu,Uwamahoro Evariste,Pianpian Ma
Herein, the phosphorus-substituted nickel cobalt sulfides nanosheet arrays growth on nitrogen doped carbonic nanofibers (donated as Ni–Co–S–P) are prepared by an electrodeposition method. The morphologies and chemical composition of Ni–Co–S–P are investigated by SEM, TEM, XPS and EDS . The electrochemical properties of Ni–Co–S–P are tested by CV , GCD and EIS technologies. And the sample Ni–Co–S–P-4 displays the most outstanding electrochemical properties including electrocatalytic activity, rate capability and specific capacitance. In addition, the iron oxide nanosheets growth on N-CNFs (Fe–O/N-CNFs) are prepared by the same electrodepositing route. And they can serve as a negative electrode according to the electrochemical performances analysis. A hybrid supercapacitor based on the obtained electrodes is further assembled by using Fe–O/N-CNFs as negative electrode and Ni–Co–S–P as positive electrode. The as-fabricated hybrid supercapacitor show outstanding energy storage performance, it possesses a high energy density at 55.8 Wh·kg −1 corresponding to a power density at 402.9 W kg −1 .
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Siqi Zhuo,Mingyue Xun,Mingda Li,Xiaoxue Kong,Rui Shao,Tiesong Zheng,Daodong Pan,Jianlin Li,Qianjin Li
S-layer protein (SLP) is a surface protein present in many bacteria and shows unique self-assemble ability for various applications, but its detection methods are very limited. In this paper, a label-free, highly selective and sensitive assay of SLP was developed by using the TiO 2 -coated porous silicon (PSi)-based microfluidic biosensor. The PSi-based biosensor could be easily prepared in a microfluidic device to build a microfluidic biosensing system for measuring SLP in samples rapidly. As the detection principle of the biosensor was based on the light reflection interference, so there was no labeling requirement. The specific recognition capability of the PSi-based biosensor was achieved by the non-covalently immobilized anti-SLP on the PSi surface. The developed biosensing system showed a rapid response time (5 min) and an excellent specificity to SLP, and displayed a broad detection linear range of 0.001 ∼ 10 μg/mL and a low detection limit of 3.2 ± 1.7 × 10 −5 μg/mL (0.70 ± 0.37 pM). The microfluidic biosensor can also be used for determination of the apparent dissociation constant ( K d ) between SLP and anti-SLP, which was measured to be 4.8 ± 0.9 × 10 -9 M.
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OPTICAL MATERIALS
·
2020
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IF 2.779
Ting Chen,Yanqiao Xu,Zhixiang Xie,Lianjun Wang,Weihui Jiang,Wan Jiang
I–III–VI quantum dots (QDs), as a new class of light-emitting materials, have aroused a great of attention for an impressive variety of applications. A facile one-pot approach was employed to synthesize highly luminescent Cu–In–Zn–S/ZnS (CIZS/ZnS) core/shell QDs. It was found that the CIZS/ZnS QDs prepared using sodium sulfide as sulfur source exhibited the strongest emission due to its highest chemical reactivity as compared to thiourea and thioacetamide. The combination of GSH content and pH value played a crucial role in the growth of ZnS shell, which was responsible for the bright emission of QDs. The surface defects of QDs could be effective passivated by GSH, which exhibited a significant improvement of emission intensity. The optimum pH value of 7 was also established due to the fact that the deprotonized sulfhydryl group of GSH molecule strongly coordinated with Zn 2+ at neutral pH value. Moreover, the particle size and composition of the CIZS/ZnS QDs can be well adjusted by tuning the n Zn / n CuInZn ratios. The maximum quantum yield (QY) of CIZS/ZnS QDs increased from 5.95% to 26.12%, accompanying by the improvement of the radiative decay rate from 1.90 × 10 5 to 5.64 × 10 5 s −1 . Furthermore, a blue LED-pumped white light-emitting diode (WLED) device was realized by combining yellow-orange CIZS/ZnS QDs with green Lu 3 Al 5 O 12 :Ce 3+ phosphor, achieving a luminous efficacy (LE) of 66.9 lm/W, and color rendering index (CRI) of 87.2, which demonstrated their great application potential in solid-state lighting field.
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