BMC Oral Health
·
2023
·Vol. 23
·期 1
·1-10
·
IF 2.9
Lv Silei,Fan Wei,Fan Bing
Background Enterococcus faecalis (E. faecalis) is frequently isolated from root canals with failed root canal treatments. Due to the strong ability of E. faecalis to resist many often-used antimicrobials, coping with E. faecalis infections remains a challenge. The aim of this study was to investigate the synergistic antibacterial effect of low-dose cetylpyridinium chloride (CPC) and silver ions (Ag+) against E. faecalis in vitro.Methods The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) and the fractional inhibitory concentration index (FICI) were used to confirm the existence of the synergic antibacterial activity between low-dose CPC and Ag+. Colony-forming unit (CFU) counting, time-killing curve and dynamic growth curve were used to evaluate the antimicrobial effects of CPC and Ag+ combinations against planktonic E. faecalis. Four weeks biofilms were treated with drug-contained gels to determine the antimicrobial effect on biofilm-resident E.faecalis, and the integrity of E.faecalis and its biofilms were observed by FE-SEM. CCK-8 assays was used to test the cytotoxicity of CPC and Ag+ combinations on MC3T3-E1 cells.Results The results confirmed the synergistic antibacterial effect of low-dose CPC and Ag+ against both planktonic and 4-week biofilm E. faecalis. After the addition of CPC, the sensitivity of both planktonic and biofilm-resident E. faecalis to Ag+ improved, and the combination showed good biocompatibility on MC3T3-E1 cells.Conclusion sLow-dose CPC enhanced the antibacterial ability of Ag+ against both planktonic and biofilm E.faecalis with good biocompatibility. It may be developed into a novel and potent antibacterial agent against E.faecalis, with low toxicity for root canal disinfection or other related medical applications.
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Light-Science & Applications
·
2023
·Vol. 12
·期 1
·1-10
·
IF 19.4
Gu Kai,Zhong Haizheng
Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials.
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IONICS
·
2023
·Vol. 29
·期 7
·2925-2933
·
IF 2.8
Wang Lu,Li Jingjing,You Junhua,Wang Zhiwei,Qi Xiaojing,Xu Jingsheng
NiCo 2 O 4 /NiMoO 4 hierarchical composite structure is used for high-performance supercapacitors electrode materials. The electrode material is grown directly on the conductive carbon cloth, which effectively reduces the contact resistance between the collector and the active material, and provides a favorable skeleton structure for NiCo 2 O 4 /NiMoO 4 . In this work, NiCo 2 O 4 /NiMoO 4 electrodes were prepared under optimal conditions of primary hydrothermal time of 12 h, annealing temperature of 350 °C, and secondary hydrothermal time of 8 h. The optimized hierarchical NiCo 2 O 4 /NiMoO 4 electrode exhibits a high areal capacitance of 3.85 F·cm −2 (at a current density of 4 mA·cm −2 ) and better cycle stability than the NiCo 2 O 4 and NiMoO 4 electrode, respectively. The constructed asymmetric supercapacitor NiCo 2 O 4 /NiMoO 4 //AC has a satisfactory energy density of 38.69 Wh·kg −1 at 228.56 W·kg −1 power density. At the current density of 4 mA·cm −2 , ASC devices still have a capacity retention rate of 90.88% after 5000 cycles, indicating their potential application in energy storage devices.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·71088-71102
·
IF 5.8
Fan Xinfei,Liu Na,Yang Jia,Yu Yueling,Xu Yuanlu,Song Chengwen,Liu Yanming
Persulfate activation is emerged as an alternative applied in environment remediation, but it is still a great challenge to develop highly active catalysts for efficient degradation of organic pollutants. Herein, a heterogeneous iron-based catalyst with dual-active sites was synthesized by embedding Fe nanoparticles (FeNPs) onto the nitrogen-doped carbon, which was used to activate peroxymonosulfate (PMS) for antibiotics decomposition. The systematic investigation indicated the optimal catalyst exhibited a significant and stable degradation efficiency of sulfamethoxazole (SMX), in which the SMX can be completely removed in 30 min even after 5 cycle tests. Such satisfactory performance was mainly attributed to the successful construction of electron-deficient C centers and electron-rich Fe centers via the short C-Fe bonds. These short C-Fe bonds accelerated electrons to shuttle from SMX molecules to electron-rich Fe centers with a low transmission resistance and short transmission distance, enabling Fe (III) to receive electrons to promote the regeneration of Fe (II) for durable and efficient PMS activation during SMX degradation. Meanwhile, the N-doped defects in the carbon also provided reactive bridges that accelerated the electron transfer between FeNPs and PMS, ensuring the synergistic effects toward Fe (II)/Fe (III) cycle to some extent. The quenching tests and electron paramagnetic resonance (EPR) indicated O 2 ·− and 1 O 2 were the dominant active species during the SMX decomposition. As a result, this work provides an innovative method to construct a high-performance catalyst to active sulfate for organic contaminant degradation.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 17
·7319-7332
·
IF 4.5
Hou Zhaoping,Tian Zihan,Zhao Junming,Yang Xinhe,Liu Liangliang
Zeolite imidazole framework-8 (ZIF-8), serving as a promising adsorbent for wastewater treatment, is limited in practical wastewater treatment due to its polycrystalline powder form resulting in poor recoverability. Herein, the millimeter-scale ZIF-8@porous mullite beads were prepared by the seeded-secondary growth method. The surface of the porous mullite beads is fully encapsulated by nanoscale ZIF-8 crystals, and the ZIF-8 crystals are anchored by mullite whiskers. This composition provides ZIF-8 with a stable macroscopic structure and maintains the exposure of its adsorption sites. Therefore, the ZIF-8@porous mullite beads exhibited good adsorption performance toward methyl orange (MO) and orange G (OG) in the aqueous solution. The analysis of adsorption kinetics indicating the adsorption efficiency of ZIF-8@mullite-w on MO and OG is influenced by the concentration of adsorbates and the adsorption sites. The maximum adsorption of ZIF-8@porous mullite beads on MO and OG was 16.5289 and 5.111 mg/g, respectively.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 32
·78988-79000
·
IF 5.8
Dong Jiayu,Song Xianni,Zhang Shuchi,Tan Mengyu,Zhao Haiyan,Wu Donglei
A novel hierarchical Cu/ZSM-5 was prepared over alkaline treatment and incipient wet impregnation method for the catalytic ozonation of polyvinyl alcohol (PVA). Under the optimum preparation conditions, hierarchical Cu/ZSM-5 exhibited an excellent mineralization performance during the PVA degradation process, and the removal rate of TOC after 60 min of reaction was 47.86%, much higher than that of ozonation alone (5.40%). Its high catalytic activity could attribute to the large pore volume (0.27 cm 3 /g) and pore size (6.51 nm) which are beneficial for the distribution of loaded copper and adsorption performance for PVA. Compared to ·OH, 1 O 2 (2.66 times in 10 min) contributed more to the removal of PVA. The degradation of PVA was a combined process of direct ozone oxidation, catalytic ozonation and adsorption. With its high catalytic performance and stability, hierarchical Cu/ZSM-5 has a very broad application prospect in the process of catalytic ozonation of refractory pollutants.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 16
·3275-3284
·
IF 4.3
Zhang Qiaoli,Lv Jiale,Xia Junmei,Wang Liangliang,Qu Gang,Yang Yuntao,Yang Yang,Liu Shilei
Carbamate nerve agents (CMNAs) are a type of lethal cholinesterase inhibitor with one or more quaternary amine centres and aromatic rings. CMNAs have been recently added to the Annex on Chemicals of the Chemical Weapons Convention (CWC) and Schedules of Controlled Chemicals of China. In this study, a rapid, sensitive and selective method was developed for the fluorescence detection of ambenonium chloride (AC) through host-guest and electrostatic dual interactions between AC and cyclodextrin/11-mercaptoundecanoic acid (CD/MUA) dually functionalized gold nanoclusters (AuNCs). Through this method, AC was detected with a limit of detection of 10.0 ng/mL. Method evaluation showed high selectivity towards AC over other related compounds. The practical applicability was verified, as satisfactory recoveries were obtained for AC spiked in river water and urine, as well as Proficiency Test samples from Organisation for the Prohibition of Chemical Weapons (OPCW). In addition, a fluorescence sensing array comprising four AuNCs was designed to distinguish six carbamates and structurally similar compounds. This method provides a potential approach for the rapid, sensitive and selective recognition and detection of CMNAs. Graphical Abstract
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Journal of Analysis and Testing
·
2023
·Vol. 7
·期 2
·110-117
·
IF 4.7
Luo Yujie,Ye Qichao,Xie Tianjin,Xie Jiali,Mao Kai,Zou Hongyan,Li Yuanfang,Huang Chengzhi,Zhen Shujun
Traditional detection of thiodiglycol (TDG), a metabolic marker for sulfur mustard poisoning, requires not only professional operators, but also expensive reagents and large instruments. Herein, we developed a novel molecular imprinted polymers (MIPs)-based lateral flow assay (LFA) strategy for the quick, sensitive, and selective detection of TDG. Gold nanoparticles (AuNPs), MIPs, and metallothioneins (MTs) were respectively loaded on the conjugate pad, test line (T line) and control line (C line). After adding TDG, AuNPs on the conjugate pad reacted with TDG through the Au–S bond first. Then, under the action of capillary force, the conjugates of TDG and AuNPs were trapped by the MIPs as they traveled to the T line, and the residual AuNPs bound with the MTs on the C line, exhibiting two obvious red bands on T line and C line, respectively. In contrast, a single red band could be observed on C line without TDG. This method exhibited a wide linear range from 10.0 pg/mL to 10,000.0 ng/mL and its limit of detection (LOD) was as low as 0.41 pg/mL. This method was successfully utilized to detect TDG in human urine, presenting significant potential in the point-of-care testing of TDG in clinical samples of the sulfur mustard poisoning patients.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 3
·516-524
·
IF 3.1
Cheng Xue,Jiang Xinshu,Liu Liquan,Huang Jun
Emerging contaminants(ECs) have aroused great concerns due to their widespread presence as well as their potential health and ecological risks. Currently monitoring data about ECs in Chinese rural areas are still limited. In this study, Taige Canal basin was selected as a typical rural area for a pilot study. The occurrence of ECs, including pharmaceutical and personal care products(PPCPs), pesticides, plasticizers and flame retardants, in surface water and aquaculture ponds, as well as in wastewater treatment facilities, was comprehensively investigated. The effectiveness of rural decentralized wastewater treatment facilities and centralized wastewater treatment plant(WWTP) in removing ECs was also analyzed. Among 126 commonly used pesticides for target analysis, 25 compounds were detected in surface water with high frequency of >80%. Besides, 55 PPCPs, 21 pesticides and 18 other industrial products were identified by non-target analysis using high resolution mass spectrometry(HRMS). Totally 18 compounds were detected in surface water with a frequency of >60% and 6 of them were found in all samples, including irbesartan, valsartan, propazine, buprofezin, bis(2-ethylhexyl) phthalate(DEHP) and tri-(2-chloroisopropyl) phosphate(TCPP), with mean concentrations of 3022, 195, 125, 218, 3738 and 545 ng/L, respectively. There are 29 compounds(11 PPCPs, 8 pesticides and 10 other industrial products) detected in water samples from the aquaculture ponds, of which 13 compounds were found in all three ponds. The removal efficiencies of ECs in wastewater treatment facilities are generally limited, except valsartan(82%–86%), nobiletin(100%) and diisodecylphthalate(100%) were found to be significantly removed.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Ren Xinyi,Zhao Jian,Li Xuning,Shao Junming,Pan Binbin,Salamé Aude,Boutin Etienne,Groizard Thomas,Wang Shifu,Ding Jie,Zhang Xiong,Huang Wen-Yang,Zeng Wen-Jing,Liu Chengyu,Li Yanguang,Hung Sung-Fu,Huang Yanqiang,Robert Marc,Liu Bin
While exploring the process of CO/CO 2 electroreduction (CO x RR) is of great significance to achieve carbon recycling, deciphering reaction mechanisms so as to further design catalytic systems able to overcome sluggish kinetics remains challenging. In this work, a model single-Co-atom catalyst with well-defined coordination structure is developed and employed as a platform to unravel the underlying reaction mechanism of CO x RR. The as-prepared single-Co-atom catalyst exhibits a maximum methanol Faradaic efficiency as high as 65% at 30 mA/cm 2 in a membrane electrode assembly electrolyzer, while on the contrary, the reduction pathway of CO 2 to methanol is strongly decreased in CO 2 RR. In-situ X-ray absorption and Fourier-transform infrared spectroscopies point to a different adsorption configuration of *CO intermediate in CORR as compared to that in CO 2 RR, with a weaker stretching vibration of the C–O bond in the former case. Theoretical calculations further evidence the low energy barrier for the formation of a H-CoPc-CO – species, which is a critical factor in promoting the electrochemical reduction of CO to methanol.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 29
·73534-73547
·
IF 5.8
Lin Sudan,Xu Yongzhi,Fu Chen,Zhang Haifeng,Kong Qiaoping,He Haoran,Liu Siyuan,Shi Xueqing,Zhao Dandan
Recently, selective phosphorus removal from aqueous solution has been a highly desirable strategy to combat eutrophication due to the increasingly stringent phosphorous emission standards. However, conventional adsorbents pose the limitations in phosphate removal suffering from lack of selectivity and stability under complicated condition and poor separation. In this study, novel Y 2 O 3 based calcium-alginate (Y 2 O 3 /SA) beads of feasible stability and highly selectivity towards phosphate by encapsulating Y 2 O 3 nanoparticles inside calcium-alginate beads via Ca 2+ controlled gelation process was synthesized and characterized. The phosphate adsorption performance and mechanism were investigated. In general, a high selectivity among co-existing anions was found with co-existing anion concentration up to 62.5 times of the phosphate concentration. Additionally, phosphate adsorption by Y 2 O 3 /SA beads exhibited stable performance over a wide pH range between 2 and 10, while reaching the maximum adsorption capacity at pH 3 (48.54 mg-P/g). The value of point of zero charge (pH pzc ) of Y 2 O 3 /SA beads was approximately 3.45. Pseudo-second-order and Freundlich isotherm models can well accord with kinetics and isotherms data. The FTIR and XPS characterizations analyzed that inner-sphere complexes were proposed to be the major contributor of Y 2 O 3 /SA beads for phosphate removal. In conclusion, Y 2 O 3 /SA beads as the mesoporous material exhibited excellent stability and selectivity towards phosphate removal.
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CLAYS AND CLAY MINERALS
·
2023
·Vol. 71
·期 1
·106-118
·
IF 2.2
Zhao Fan,Zhang Guangyao,Jiang Yong,Wang Hui,Cao Chi,Qi Yongbo,Wang Qingyun,Zhao Huaiyan
The formation of manganese (Mn) oxides is influenced by environmental conditions and, in some red soils, Mn oxides occur as coatings on the surface of kaolinite particles in the form of colloidal films or fine particles. The present study aimed to explore the types of formation mechanisms of Mn oxide minerals on the surface of kaolinite. Mn oxide minerals synthesized by reducing the Mn in KMnO 4 with a divalent Mn salt (MnSO 4 ) were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of various initial molar ratios of Mn 2+ /Mn 7+ (R = 1:0.67, 1:1, 1:2, and 1:4), cationic species (Na + or Mg 2+ ), synthesis temperatures (30, 60, and 110°C), and amount of added kaolinite (0.25, 0.5, 1.0, 2.0, and 5.0 g) on the formation of Mn oxides were studied. The results showed that Mn oxide mineral types were affected by the initial R value and the background cation. With decreases in the initial R value, the synthesized minerals transformed from cryptomelane to birnessite. The relative mass ratios of kaolinite to Mn oxide were calculated as 1:0.92, 1:0.63, 1:1.15, and 1:1.63. The sodium cation (Na + ) had a greater role than Mg 2+ in promoting the dissolution–recrystallization of birnessite to cryptomelane. The synthesis temperature had no effect on mineral types, but Mn content increased as temperature increased. When the amount of added kaolinite was increased from 0.25 to 5.0 g, Mn oxide minerals formed gradually and transformed from birnessite to cryptomelane. This work revealed a possible formation process and reaction mechanism on the surface of kaolinite particles in some red soils.
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