TOPICS IN CATALYSIS
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2022
·Vol. 66
·期 1
·262-274
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IF 2.781
Pham Cham Q.,Nguyen Van-Phuoc,Van Thuan Tran,Phuong Pham T.T.,Pham Phuong T.H.,Trinh Thanh H.,Nguyen Tung M.
Syngas, a mixture of carbon monoxide and hydrogen, is widely used in electricity, synthetic chemicals, and fuels productions. Syngas can be obtained from a chemical reaction between methane and carbon dioxide that are commonly found in biogas. In this study, a simulated mixture of biogas containing CH 4 :CO 2 = 1:1 (mol/mol) was used as the feedstock. Different nickel-based catalysts supported on TiO 2 , MgO, KIT-6, and Al 2 O 3 have been prepared through the dry impregnation method with a fixed Ni dosage of 10 wt%. All samples were characterized by modern techniques including XRD, BET, H 2 -TPR, CO 2 -TPD, TPO, and TEM. It was found that the metal-support interaction played a critical role in metal dispersibility and reducibility of catalyst precursors. During the methane dry reforming, catalyst basicity is a crucial factor facilitating the adsorption and activation of carbon dioxide. The highest activity was achieved over 10Ni/Al 2 O 3 with the methane conversion of 73.2% and carbon dioxide conversion of 86.9%. Furthermore, the effects of support properties on the catalyst stability were studied. Nature of support especially basicity plays an important role on the deposition of carbon over the active sites. The Ni/Al 2 O 3 with good nickel dispersibility, affordable metal-support interaction, reasonable basicity was reported the most stable without any significant deactivation after 6 h reaction. Finally, the catalyst design strategy for the DRM was proposed.
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MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-10
·
IF 6.408
Zhu Jing,Xu Wenxing,Yang Ye,Kong Rongmei,Wang Junmei
A nanozyme sensor array based on the ssDNA-distensible C3N4 nanosheet sensor elements for discriminating multiple mycotoxins commonly existing in contaminated cereals has been explored. The sensor array exploited (a) three DNA nonspecific sequences (A40, T40, C40) absorbed on the C3N4 nanosheets as sensor elements catalyzing the oxidation of TMB; (b) the presence of five mycotoxins affected the catalytic activity of three nanozymes with various degrees. The parameter (A 0 -A) was employed as the signal output to obtain the response patterns for different mycotoxins with the same concentration where A 0 and A were the absorption peak values at 650 nm of oxTMB in the absence and presence of target mycotoxins, respectively. After the raw data was subjected to principal component analysis, 3D canonical score plots were obtained. The sensor array was capable of separating five mycotoxins from each other with 100% accuracy even if the concentration of the mycotoxins was as low as 1 nM. Moreover, the array performed well in discriminating the mycotoxin mixtures with different ratios. Importantly, the practicality of this sensor array was demonstrated by discriminating the five mycotoxins spiking in corn-free samples in 3D canonical score plots, validating that the sensor array can act as a flexible detection tool for food safety. Graphical abstract A nanozyme sensor array was developed based on the ssDNA-distensible C3N4 NSs sensor elements for discriminating muitiple mycotoxins.
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Carbon Letters
·
2022
·Vol. 33
·期 1
·163-175
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IF 3.117
Liu Shouxiang,Chen Yu,Qiao Yang,Li Zhiqiang,Wei Yanyan
Cracks are an inevitable problem during the use of materials, and flexible sensors with self-healing capability are of great importance for applications in wearable devices and skin-like electronic devices. This paper prepared self-healing flexible strain sensors by compounding self-healing polyurethane with carbon nanotubes. First, by changing the ratio of disulfide bonds, a good balance between mechanical properties and self-healing efficiency was achieved in the prepared self-healing polyurethane. The most balanced sample reached 12.28 MPa in tensile strength, after 24 h of self-repair at 30 °C, the tensile strength was 7.75 MPa, and the self-repair efficiency was 63.11%; after 24 h of self-repair at 80 °C, the tensile strength was 11.64 MPa, and the self-repair efficiency reached 94.79%. Then the sensors prepared by compounding with carbon nanotubes showed a good electrochemical response, and both slow and fast repeated bending of the finger wearing the sensors yielded significantly different electrical signal changes, and the sensors were cut off and still had the same function after self-repair at 30 °C, demonstrating their excellent potential for applications in soft robots, wearable devices, etc.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 415
·期 1
·157-166
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IF 4.478
Yang Zuan,Hu Jing,Zhang Xiaoyu,Yang Huimin,Meng Peiran,Zhao Huanying,Sun Yue
Sensitive determination of ofloxacin (OFL) is very essential for human health and environmental protection. Here, a novel composite of gold nanoparticles(nAu)@MXene(Ti 3 C 2 T x )/poly- p -aminobenzene sulfonic acid (PABSA) was fabricated on the surface of glassy carbon electrode (GCE) and used to sensitively determine OFL. The results of experiments showed that the obtained nAu@Ti 3 C 2 T x /PABSA/GCE electrode could be used as an electrochemical sensor to directly detect ofloxacin (OFL) by differential pulse voltammetry (DPV). Under the optimal conditions, the proposed electrode displayed a broader linear range and a lower detection limit (LOD) for OFL determination when it was compared to those similar sensors. The linear range was from 5.0 × 10 −8 to 5.0 × 10 −4 mol/L and the LOD was 3.7 × 10 −8 mol/L ( S / N = 3). The nAu@Ti 3 C 2 T x /PABSA/GCE electrode also showed good selectivity, repeatability, and reproducibility. Finally, the proposed electrode was used to detect OFL in commercial samples by the standard addition method. The obtained recovery was from 97.3% and 105.7% showing its potential applications in actual sample analysis. Graphical Abstract
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Li Shuo,Zhang Yong,Liang Xiaoping,Wang Haomin,Lu Haojie,Zhu Mengjia,Wang Huimin,Zhang Mingchao,Qiu Xinping,Song Yafeng,Zhang Yingying
Numerous studies have shown flexible electronics play important roles in health management. The way of power supply is always an essential factor of devices and self-powered ones are very attractive because of the fabrication easiness, usage comfort and aesthetics of the system. In this work, based on the metal-air redox reaction, which is usually used in designing metal-air batteries, we design a self-powered chemoelectric humidity sensor where a silk fibroin (SF) and LiBr gel matrix containing parallel aligned graphene oxide (GO) flakes serve as the electrolyte. The abundant hydrophilic groups in GO/SF and the hygroscopicity of LiBr lead to tight dependence of the output current on the humidity, enabling the sensor high sensitivity (0.09 μA/s/1%), fast response (1.05 s) and quick recovery (0.80 s). As proofs of concept, we design an all-in-one respiratory monitoring-diagnosing-treatment system and a non-contact human-machine interface, demonstrating the applications of the chemoelectric humidity sensor in health management.
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WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
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2022
·Vol. 38
·期 12
·1-14
·
IF 4.253
Wang Ju,Yin Lifen,Zheng Wenxiu,Shi Shengnan,Hao Wenzhuo,Liu Changhong,Zheng Lei
Intestinal peristalsis is essential for gastrointestinal function, which could maintain the appropriate progression and digestion of food and reduce bacterial aggregation through mixing function. Even though certain ingredients of foodstuff are known to increase or decrease intestinal peristalsis, the role of environmental pollutants on intestinal peristalsis is relatively unknown. Therefore, the effects of four typical environmental pollutants (oxytetracycline, arsenic, polychlorinated biphenyls and chlorpyrifos) on intestinal peristalsis in the zebrafish model and then tested the recovery effect of the constipation-resistant probiotic. The results showed that 4-day environmental pollutants exposures on the zebrafish embryos at 1 day post fertilization clearly decreased the intestinal peristalsis through decreasing the serotonin (5-HT) production and down-regulating the expression of key genes involved in 5-HT synthesis. Pollutants-evoked change of gut motility could be normalized in the presence of Lactobacillus rhamnosus GG (LGG) via increasing 5-HT secretion. Exogenous 5-hydroxytryptophan (100 µg/L) could also rescue the dysfunction of gut motility in pollutants-treated zebrfish. The data identified that LGG normalized disorder of intestinal peristalsis induced by environmental pollutants through increasing 5-HT level. The stimulant effect of LGG on peristalsis may be associated with 5-HT system, which could provide references for the application of probiotics in regulation of gut dysmotility. Graphical abstract
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-14
·
IF 17.694
Baimanov Didar,Wang Jing,Zhang Jun,Liu Ke,Cong Yalin,Shi Xiaomeng,Zhang Xiaohui,Li Yufeng,Li Xiumin,Qiao Rongrong,Zhao Yuliang,Zhou Yunlong,Wang Liming,Chen Chunying
How soft corona, the protein corona’s outer layer, contributes to biological identity of nanomaterials is largely because capturing protein composition of the soft corona in situ remains challenging. We herein develop an in situ Fishing method that can monitor the dynamic formation of protein corona on ultra-small chiral Cu 2 S nanoparticles (NPs) allowing us to directly separate and identify the corona protein composition. Our method detects spatiotemporal processes in the evolution of hard and soft coronas on chiral NPs, revealing subtle differences in NP − protein interactions even within several minutes. This study highlights the importance of in situ and dynamic analysis of soft/hard corona, provides insights into the role of soft corona in mediating biological responses of NPs, and offers a universal strategy to characterize soft corona to guide the rational design of biomedical nanomaterials.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 8
·2504-2516
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IF 2.936
Chen Jiaxuan,Hu Shen,Chen Zhuo,Sun Xincheng,Chen Minhao,Chen Tianjiao,Ye Guanghua,Zhou Xinggui
The effects of molecular size on SiO 2 deposition regulated surface barriers and zeolite catalysis are probed, taking n -pentane isomerization and benzene alkylation with ethylene as model reactions. Chemical liquid deposition of SiO 2 on the parent ZSM-5 sample only modifies its external surface slightly and passivates a small proportion of Brønsted acid sites. The apparent diffusivities increase significantly at 363–393K after SiO 2 deposition, indicating SiO 2 on ZSM-5 crystals reduces surface barriers at low temperatures. The conversion for n -pentane isomerization increases by up to 26% after SiO 2 deposition, while the conversion for benzene alkylation decreases by up to 19%. Obviously, the positive effect of SiO 2 deposition can be balanced out by the pore confinement effect at high temperatures, which is stronger for a larger molecule. This work provides a unique understanding of molecular size effects on surface barriers, which should serve to guide the design of zeolite catalysts. Graphical Abstract
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Dong Haijiao,Du Wei,Dong Jian,Che Renchao,Kong Fei,Cheng Wenlong,Ma Ming,Gu Ning,Zhang Yu
As pioneering Fe 3 O 4 nanozymes, their explicit peroxidase (POD)-like catalytic mechanism remains elusive. Although many studies have proposed surface Fe 2+ -induced Fenton-like reactions accounting for their POD-like activity, few have focused on the internal atomic changes and their contribution to the catalytic reaction. Here we report that Fe 2+ within Fe 3 O 4 can transfer electrons to the surface via the Fe 2+ -O-Fe 3+ chain, regenerating the surface Fe 2+ and enabling a sustained POD-like catalytic reaction. This process usually occurs with the outward migration of excess oxidized Fe 3+ from the lattice, which is a rate-limiting step. After prolonged catalysis, Fe 3 O 4 nanozymes suffer the phase transformation to γ-Fe 2 O 3 with depletable POD-like activity. This self-depleting characteristic of nanozymes with internal atoms involved in electron transfer and ion migration is well validated on lithium iron phosphate nanoparticles. We reveal a neglected issue concerning the necessity of considering both surface and internal atoms when designing, modulating, and applying nanozymes.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-14
·
IF 17.694
Zhang Zhe,Peng Haoran,Yang Dongchen,Zhang Guoqing,Zhang Jinlin,Ju Feng
Evidence for microbial degradation of polyvinyl chloride (PVC) has previously been reported, but little is known about the degrading strains and enzymes. Here, we isolate a PVC-degrading bacterium from the gut of insect larvae and shed light on the PVC degradation pathway using a multi-omic approach. We show that the larvae of an insect pest, Spodoptera frugiperda , can survive by feeding on PVC film, and this is associated with enrichment of Enterococcus , Klebsiella and other bacteria in the larva’s gut microbiota. A bacterial strain isolated from the larval intestine ( Klebsiella sp. EMBL-1) is able to depolymerize and utilize PVC as sole energy source. We use genomic, transcriptomic, proteomic, and metabolomic analyses to identify genes and proteins potentially involved in PVC degradation (e.g., catalase-peroxidase, dehalogenases, enolase, aldehyde dehydrogenase and oxygenase), and propose a PVC biodegradation pathway. Furthermore, enzymatic assays using the purified catalase-peroxidase support a role in PVC depolymerization.
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EXPERIMENTAL AND MOLECULAR MEDICINE
·
2023
·Vol. 55
·期 1
·183-195
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IF 12.8
Wu Zhuhua,Zhu Li,Nie Xinran,Wei Li,Qi Yong
Pulmonary hypertension (PH) is a life-threatening cardiopulmonary disease characterized by pulmonary vascular remodeling. Excessive growth and migration of pulmonary artery smooth muscle cells (PASMCs) are believed to be major contributors to pulmonary vascular remodeling. Ubiquitin-specific protease 15 (USP15) is a vital deubiquitinase that has been shown to be critically involved in many pathologies. However, the effect of USP15 on PH has not yet been explored. In this study, the upregulation of USP15 was identified in the lungs of PH patients, mice with SU5416/hypoxia (SuHx)-induced PH and rats with monocrotaline (MCT)-induced PH. Moreover, adeno-associated virus-mediated functional loss of USP15 markedly alleviated PH exacerbation in SuHx-induced mice and MCT-induced rats. In addition, the abnormal upregulation and nuclear translocation of YAP1/TAZ was validated after PH modeling. Human pulmonary artery smooth muscle cells (hPASMCs) were exposed to hypoxia to mimic PH in vitro, and USP15 knockdown significantly inhibited cell proliferation, migration, and YAP1/TAZ signaling in hypoxic hPASMCs. Rescue assays further suggested that USP15 promoted hPASMC proliferation and migration in a YAP1/TAZ-dependent manner. Coimmunoprecipitation assays indicated that USP15 could interact with YAP1, while TAZ bound to USP15 after hypoxia treatment. We further determined that USP15 stabilized YAP1 by inhibiting the K48-linked ubiquitination of YAP1. In summary, our findings reveal the regulatory role of USP15 in PH progression and provide novel insights into the pathogenesis of PH.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 2
·1-12
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IF 2.8
Shi Gege,Zhan Tianyu,Hu Yufang,Guo Zhiyong,Wang Sui
Conductive hydrogels possess both the physicochemical properties of hydrogels and the electrical properties of intrinsically conductive polymers. It is a versatile material that is widely used in various fields, such as supercapacitors, flexible energy storage, electronic devices, and sensors. Conductive hydrogels with self-adhesion properties can realize self-adhesion on the surface of the detected object to ensure the stability of detection signals. Inspired by the adhesion mechanism of mussels, tannic acid (TA) was modified on carbon nanotubes (TA-CNTs) were prepared on the surface of (MWCNT), which reduced the aggregation of carbon nanotubes, increased the dispersibility of carbon nanotubes in the hydrogel, and achieved good electrical conductivity and self-adhesion of the hydrogel, sodium alginate (SA), TA-CNTs synthesized a stretchable, self-adhesive, conductive double-network hydrogel by one-pot thermal initiation with stability. Hydrogen bonds between PAM and SA, which helps to construct the hydrogel networks with strong mechanical properties. The synthesized hydrogels have high strength, pliable adhesion, and strain sensitivity, showing great development potential in monitoring human motion and personal healthcare applications.
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