ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 28
·38393-38405
·
IF 4.223
Chen Shihui,Jiang Jinlin,Long Tao,Zhu Xingcheng,Zhang Huanchao,Deng Shaopo,Liu Renbin
Microcystins (MCs) are cyclic heptapeptide hepatotoxins that are highly soluble in water and can be transferred to farmland through irrigation with potentially substantial effects on crops, especially rice. In order to investigate the possible negative effects of microcystin-LR (MC-LR) on rice, the oxidative stress induced in rice suspension cells exposed to MC-LR at environmentally relevant concentrations (0.05, 0.5, 5.0, and 50.0 μg·L −1 ) was investigated. Results showed that the exposure to MC-LR at 0.5–50.0 μg·L −1 resulted in a significant decline in viability of rice suspension cells and an increase in malondialdehyde (MDA) contents. In the 50.0-μg·L −1 MC-LR treatment group, the content of MDA was as much as 5.39 times that of the control group after 6 days of exposure. The excess MDA production indicated that MC-LR exposure has caused lipid peroxidation damage in rice cells, whereas these negative effects could be recovered over time when suspension cells were exposed to low concentration of MC-LR (0.05 μg·L −1 ). When exposed to MC-LR for 3 days, the O 2 − content in all treatment groups increased significantly compared with the control group. Additionally, the antioxidant system of rice suspension cells initiated a positive stress response to MC-LR exposure. Indeed, peroxidase (POD) played an active role in the removal of reactive oxygen species (ROS) in rice suspension cells during the early period of exposure, while total superoxide dismutase (T-SOD) was induced after 6 days. Similarly, after 6 days of exposure, the anti-superoxide anion free radical activity (ASAFR), glutathione (GSH), and glutathione-S transferase (GST) in rice suspension cells were higher than that in the control group. These results provided a comprehensive understanding of the exposure time- and dose-dependent oxidative stress induced by the environmentally relevant concentrations of MC-LR in rice suspension cells.
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PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 4
·1-12
·
IF 3.097
Hu Zhiqiang,Xin Yangyang,Fu Qiang
High-performance wearable electronics show great potential in the soft robotics, artificial intelligence, human–machine interaction, health care, etc. Due to the wide application in heart rate detection, voice monitoring, and sports data collection, the pressure sensor has grasped a lot of attention. However, poor cycle stability, low sensitivity and narrow working pressure range hinder the further development of the pressure sensors. To solve the above mentioned problems, a polyurethane-based conductive sponge is prepared via silver nanoparticle coating after the in-situ synthesis of poly(3,4-ethylene dioxythiophene) on the backbones of polyurethane foam. The flexible pressure sensor exhibits excellent performance, including ultrahigh sensitivity (3.039 kPa −1 ), wide working range (0–35 kPa), frequency-independent performance, reliable repeatability (~ 1000 cycles), rapid and stable response. Finally, we successfully demonstrated these flexible sensors in detecting tiny physiological activities and human motions. All the results demonstrate that the the polyurethane-based pressure sensor is a promising candidate for soft electronics and healthcare monitoring.
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Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-8
·
IF 4.703
Lv Chunzheng,He Lirong,Tang Jiahong,Yang Feng,Zhang Chuhong
As an important photoconductive hybrid material, perylene/ZnO has attracted tremendous attention for photovoltaic-related applications, but generally faces a great challenge to design molecular level dispersed perylenes/ZnO nanohybrids due to easy phase separation between perylenes and ZnO nanocrystals. In this work, we reported an in-situ reaction method to prepare molecular level dispersed H-aggregates of perylene bisimide/ZnO nanorod hybrids. Surface photovoltage and electric field-induced surface photovoltage spectrum show that the photovoltage intensities of nanorod hybrids increased dramatically for 100 times compared with that of pristine perylene bisimide. The enhancement of photovoltage intensities resulting from two aspects: (1) the photo-generated electrons transfer from perylene bisimide to ZnO nanorod due to the electric field formed on the interface of perylene bisimide/ZnO; (2) the H-aggregates of perylene bisimide in ZnO nanorod composites, which is beneficial for photo-generated charge separation and transportation. The introduction of ordered self-assembly thiol-functionalized perylene-3,4,9,10-tetracarboxylic diimide (T-PTCDI)/ ZnO nanorod composites induces a significant improvement in incident photo-to-electron conversion efficiency. This work provides a novel mentality to boost photo-induced charge transfer efficiency, which brings new inspiration for the preparation of the highly efficient solar cell.
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高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-18
·
IF 14.919
Gao Feng,Shao Tianyi,Yu Yunpeng,Xiong Yujie,Yang Lihua
Acting by producing reactive oxygen species (ROS) in situ, nanozymes are promising as antimicrobials. ROS’ intrinsic inability to distinguish bacteria from mammalian cells, however, deprives nanozymes of the selectivity necessary for an ideal antimicrobial. Here we report that nanozymes that generate surface-bound ROS selectively kill bacteria over mammalian cells. This result is robust across three distinct nanozymes that universally generate surface-bound ROS, with an oxidase-like silver-palladium bimetallic alloy nanocage, AgPd 0.38 , being the lead model. The selectivity is attributable to both the surface-bound nature of ROS these nanozymes generate and an unexpected antidote role of endocytosis. Though surface-bound, the ROS on AgPd 0.38 efficiently eliminated antibiotic-resistant bacteria and effectively delayed the onset of bacterial resistance emergence. When used as coating additives, AgPd 0.38 enabled an inert substrate to inhibit biofilm formation and suppress infection-related immune responses in mouse models. This work opens an avenue toward biocompatible nanozymes and may have implication in our fight against antimicrobial resistance.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 13
·7862-7878
·
IF 4.22
Cao Xue-Fang,Yue Pan,Wei Qiu-Rui,Dang Yun-Fei,Zhang Si-Qi,Wei Zhi-Xian,Wang Rong-Zhen
In this study, a solar-driven photocatalyst La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. Results show that p – n heterojunction was formed, and it has considerable photocatalytic properties under ultraviolet light and solar irradiation. More importantly, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) also exhibits Fenton-like catalytic performance in the presence of H 2 O 2 and oxalic acid (OA). The main reactive radicals of the La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 –H 2 O 2 –OA–sunlight system are h + , · OH and · O 2 − . The chemical oxygen demand removal rate of MO wastewater in La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%)–H 2 O 2 –oxalic acid–sunlight system reached 72.4%; the value was higher than that of the sum of single photocatalysis (34.5%) and Fenton-like-dark system (27.6%), indicating that there is a synergistic effect between the photocatalysis and Fenton-like on MO degradation. In addition, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) displays approximately superparamagnetism and has higher saturated magnetization ( M s ), low coercive force and residual magnetism. So it can be easily recovered by an external magnetic field and can be reused 6 times. It was anticipated that La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure is a stable and reusable solar-light-driven magnetic photocatalyst and has great potential applications for wastewater treatment. Graphical abstract The magnetic La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized by different methods. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. It is not only a solar-driven photocatalyst with high efficiency, but also shows excellent Fenton-like catalytic effect. And the photocatalysis and Fenton-like system exhibited synergetic catalytic effect on MO degradation by La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%). Furthermore, near superparamagnetic characteristics of the catalyst make it easy to recycle by the external magnetic field and can be reused for 6 times, suggesting that it is a stable multifunctional catalyst.
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高影响因子
Journal of the Iranian Chemical Society
·
2021
·Vol. 18
·期 9
·2231-2239
·
IF 2.019
Li Jiye,Zuo Xinyu,Liu Hao,Xie Yuanyang,Huang Yu
In recent years, aptamer-based gold nanoparticles (AuNPs) colorimetric sensors have received extensive attention, especially in discovery of disease markers and food safety. However, the detection sensitivity is not high enough and the detection results are prone to false positives. Therefore, it is urgently to improve the performance of sensors, ranging from the optimization of sensor detection conditions and establishment of new sensing methods. pH is an important parameter in the solution. In this article, pH was employed to adjust the aptamer charge to increase the sensitivity of lysozyme detection, and the detection limit can be approached as low as 0.05 nM. pH was also used to adjust the target charge to improve the performance of sensors. Chloramphenicol (CAP) and precursors of chloramphenicol (CAP-base) were used as targets to verify the charge effect introduced by pH adjustment. The experiment found that the neutral or electronegativity target would weaken the response of the sensor. To achieve the detection of CAP (electron neutral), a competitive colorimetric sensor had been successfully established to detect CAP. The Derjaguin–Landau–Verwey–Overbeck (DLVO) theory was used to explain the effect of pH on sensor performance. Therefore, by adjusting pH, the detection sensitivity can be improved significantly and a new sensing method can be established, which provide a broad application prospects for chemical, environmental and biological sensing.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 3
·623-628
·
IF 1.307
Zong Siyu,Wang Bolun,Ma Wenyan,Yan Yan,Li Jiyang
A facile method was developed to prepare carbon dots(CDs) by pyrolysis and etching of coffee residue. The as-prepared CDs show uniform spherical nanoparticles with an average size of 2.3 nm and exhibit excitation-dependent fluorescence emissions. Moreover, CDs also exhibit strong fluorescence quenching to nitro compounds and metal ions in both water and ethanol solutions, which could act as a platform for dual detection of PA(picric acid) and Fe 3+ ions with low detection limits of 0.26 and 0.83 µmol/L, respectively. This work provides a novel method for preparation of environmental-friendly fluorescent CDs and shows their potential applications in photoluminescence sensors.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 19
·11426-11435
·
IF 4.22
Yan Dong,Peng Zhen,Wang Wei,Zeng Peng,Huang Yiyin
Abstract Carbon-based metal-free catalysts exhibit great applications in electrochemical CO 2 reduction (ECR), while most studies merely focus on large-sized carbons with limited ratio of surface atoms for engineering to create surface active centers. Here, we report a joint treatment of C60 by heating and plasma to induce a dramatic performance promotion during ECR. The electrochemical measurements indicate the Faraday efficiency for ECR toward CO production kept at high level over 80% in a wide potential region from − 0.4 to − 0.7 V versus RHE, with the highest value reaching 96.8%. The physical characterization reveals that fragmentation of C60 occurs together with N/O doping, both of which could induce change in electron structure, causing the formation of *COOH intermediate and ultimately leading to the optimized activity and selectivity for CO production. This treatment route was further revealed to be applicative for other carbon materials, e.g., single-walled carbon nanotube, to promote its ECR activity and selectivity. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10951-10962
·
IF 2.478
Zhang Yakang,Liang Xuan,Jiang Mengting,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
Based on the three-dimensional ordered macroporous titanium dioxide (3DOM-TiO 2 ), a series of gold-embedded 3DOM-TiO 2 ( n Au@3DOM-TiO 2 ) with controlled Au loading amount ( n = 0.24, 1.2, 2.4, 4.8, 12, and 24 wt%) was successfully fabricated via in-situ pyrolysis for the first time. Compared with the surface-modified Au/3DOM-TiO 2 by traditional impregnation–reduction route, this body-doped Au@3DOM-TiO 2 structure exhibited smaller particle size and better dispersive property which are important for photocatalysis. Therefore, the photocatalytic activities of n Au@3DOM-TiO 2 have been tested and the optimized photocatalyst of 4.8Au@3DOM-TiO 2 was identified. A possible mechanism of Au@3DOM-TiO 2 for the enhanced photoactivity was well discussed. The present work demonstrated a unique “gold-embedded” interface with potential advantages of highly dispersed, anti-aggregation, easy recovery, and enhanced catalytic performance, and that this approach could provide an ideal platform for the further design of noble metal-doped semiconductors.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 6
·1-11
·
IF 3.097
Wang Wei-Yu,Zha Xiang-Jun,Bao Rui-Ying,Ke Kai,Liu Zheng-Ying,Yang Ming-Bo,Yang Wei
Dynamics of exchange within vitrimer networks are influenced by mobility of the chemical species involved in the exchange reaction, then it can be affected by the crystalline phase when boronic ester bond is introduced into the thermoplastic elastomers with crystalline phase as physical cross-links. In this work, the dynamic dioxaborolane cross-links were introduced into commercial poly(ethylene-α-octene) (POE) with crystalline phases as physical cross-links to prepare POE vitrimers. The results of stress relaxation show that relaxation time (τ) follows an Arrhenius law with the temperature at the melting range for not only POE vitrimers and thermally treated POE vitrimers with dynamic cross-links, but also neat POE with purely physical cross-links. The liquid-to-solid transition temperature can raise to 35.3 °C for POE vitrimers from -42.9 °C of the thermally treated one, due to the constrained mobility by residual crystalline phases. The resulted POE vitrimers maintain a stress at break of higher than 27.5 MPa and an elongation at break of higher than 800% at room temperature. With the temperature increasing, the crystal melting induced weakening of the physical cross-linking in POE decreases the strength, but the storage modulus and the stress at 300% and 500% elongation of POE vitrimers are improved. The properties of POE vitrimers can almost keep unchanged after recycling or healing. All these results show that the introduction of reversible boronic ester bonds is a promising strategy to improve the performances and recyclability of physically cross-linked POE materials.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 5
·2831-2839
·
IF 1.938
Nie Jiajin,Li Zhitong,Shi Guifei,Wang Jing,Yao Shaowei
Fe-zeolitic imidazolate framework (ZIF)@C (Fe-ZIF wrapped by carbon) anode material has been manufactured. It has porous nanostructure, which can effectively shorten the distance of lithium ion transmission, thus achieving excellent rate performance, and can also reduce the volume expansion in the charging and discharging process, thus reducing the attenuation of capacity. The external carbon coating avoids direct contact between Fe-ZIF and the electrolyte, inhibits decomposition of the electrolyte, and impedes formation of the solid electrolyte interphase (SEI) film, thus obtaining higher reversible capacity in the cycling process. At a current density of 100 mA/g, Fe-ZIF@C achieves a high discharge capacity of 719 mAh/g after 100 cycles. This research shows that Fe-ZIF@C has potential for use as an anode material for lithium-ion batteries.
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高影响因子
IONICS
·
2021
·Vol. 28
·期 1
·451-462
·
IF 2.817
Peng Rui,Chen Wen,Zhou Qian
In this study, multi-walled carbon nanotubes (MWCNTs) were first coated on the surface of glassy carbon electrode (GCE), and then, the copper nanodendrites (CuNDs) were synthesized on the surface of MWCNTs/GCE by electrodeposition. Afterward, the CuNDs/MWCNTs/GCE was prepared. The electrochemical performance of CuNDs/MWCNTs/GCE was investigated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The preparation conditions of CuNDs/MWCNTs/GCE and the detection conditions of chloramphenicol (CAP) were optimized. The linear range by LSV was 0.15 to 12.0 μmol/L, and the detection limit ( S / N = 3) was 9.84 nmol/L in pH = 7.0 KH 2 PO 4 -Na 2 HPO 4 buffer solution under the accumulation potential of − 0.4 V (vs. SCE) and accumulation time of 600 s. The modified electrode was applied in the determination of CAP in environmental water samples. The recoveries were between 95.78 and 102.67%, indicating that CuNDs/MWCNTs/GCE was suitable for the determination of CAP in environmental water samples.
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高影响因子
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