RSC Advances
·
2023
·Vol. 13
·期 5
·3103-3111
·
IF 3.9
Xiaowei Liu,Chen Chen,Peng Chen,Lili Wang
To address the concern about residual antibiotics in effluent of sewage treatment plants, cobalt silicate (CoSiOx) was prepared by hydrothermal method and employed as an activator of peroxymonosulfate (PMS) for the rapid degradation of antibiotics. Taking sulfamethoxazole (SMX) and tetracycline (TC) as representatives of antibiotics, the effects of operation parameters (CoSiOx and PMS dosage) and water quality parameters (temperature, solution pH, bicarbonate, chloride, and natural organic matter) on degradation of target pollutants by a CoSiOx activated PMS process (CoSiOx/PMS) were investigated. The mechanism involved in the interaction of CoSiOx and PMS was also elucidated. The results indicated that CoSiOx/PMS can degrade SMX and TC at fast pseudo-first-order rate constants (0.47 and 0.56 min−1 respectively) under optimal conditions. Increasing the dosage of PMS and CoSiOx appropriately was beneficial to the degradation of antibiotics. Chloride, bicarbonate, and HA showed negative effects on the degradation process due to their free radical-scavenging ability and were ranked as chloride < bicarbonate < HA. Abundant Co–OHs and oxygen vacancies on the surface of CoSiOx contributed to its excellent activation capability towards PMS. The radical scavenging experiments indicated that target pollutant degradation mainly resulted from the attack of sulfate radicals (43.0% contribution) and hydroxyl radicals (52.9% contribution). The practicality of CoSiOx/PMS was verified by continuous flow test. This study provides a cheap, highly efficient, and feasible advanced depollution method based on CoSiOx.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Dan Zhao,Huan Liu,Zhixia Zhang,Xincai Xiao,Jun Li
The studies on the preparation of high-quality and long-wavelength-emitting silicon quantum dots and their application in biochemical detections have attracted increasing interests from researchers. In particular, the exploration of the effect of SiQDs and their complex in antibacterial and inhibition of biofilm areas, is of great significance to human health. This paper reports the fast synthesis of green-fluorescent SiQDs (TC-SiQDs, QYs=25%, Em=520 nm) with the synergistic effect of thiourea and catechol through microwave-assisted one-step hydrothermal route. Based on internal filtering effect, TC-SiQDs were then successfully employed as selective probes to detect vitamin B 12 , with detection range at 0.05–30 μM and limit of detection at 50 nM. Thanks to the excellent biocompatibility and fluorescence property of TC-SiQDs, they have been applied in bacterial imaging. The prepared TC-SiQDs also exhibit certain antibacterial ability with their minimum inhibitory concentration (MIC) against Staphylococcus aureus ( S. aureus ) at 250 μg/mL, but their inhibitory ability is effective to the growth of S. aureus biofilm only when the concentration reaches 1.3 mg/mL. TC-SiQDs-lysozyme complex were prepared, based on the effects of singlet oxygen, charge effect and lysozyme hydrolysis of peptidoglycan in the cell wall, the complex exhibits high inhibiting activity with MIC against S. aureus at 10 μg/mL and exhibits superior inhibition activity against S. aureus biofilm at a concentration of only 62.5 μg/mL. This paper provides good theoretical and practical basis for the synthesis of long-wavelength emission and ultra-bright SiQDs and their applications in detection, antibacterial and biofilm growth inhibition, and other biomedical fields.
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Gang Jian,Yong Jiao,Qingzhen Meng,Fei Xue,Liang Feng,Ning Yang,Jianhua Jiang,Minfeng Lü
High temperature (HT) dielectrics have drawn increasing attentions due to strong potentials in capacitors working in extreme temperature conditions. The selection of high temperature ceramic fillers and polymers and the design of composite configurations are crucial for obtaining excellent dielectric and energy storage performances. In this study, PbTiO 3 nanofibers with a confined tetragonality with a lower c/a ratio are synthesized by the molten-salt method and polyimide (PI)/PbTiO 3 nanofiber composites are prepared via the in-situ polymerization. The composite (50 vol% filler loading) possesses greatly enhanced dielectric constant of 46 and low tanδ of ~0.02 at 1 kHz; ε r is 13.9 times larger than 3.3 for PI. From electric displacement-electric field loop investigations, superior energy storage performances of a large discharged energy-density of 16 J cm −3 under 300 MV m −1 and a large charge/discharge efficiency of 80 % are obtained. Furthermore, dielectric constant, energy density and efficiency of the composite exhibit a very good thermal stability from the room-temperature to over 200 °C. Overall, superior properties as well as good thermal stabilities of the PI/PbTiO 3 nanofiber composites indicate strong potentials in HT electrical energy storage capacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 27
·期 12
·3053-3059
·
IF 1.911
Nianjun Kang,Dongbo Xu,Weidong Shi
In recent years, the excessive use of antibiotics has become a serious problem for human health. BiVO 4 regarded as one of the most promising visible-light-driven photocatalysts was used to degrade the antibiotics. In this paper, we fabricated Bi/BiVO 4 plasmonic photocatalysts which enhanced the photocatalytic activity of BiVO 4 for degradation of tetracycline (TC) antibiotic. The Bi/BiVO 4 photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy . In addition, the photocatalytic experiment results show that the 0.04-Bi/BiVO 4 sample has the best photocatalytic activity for 2 times than the pure BiVO 4 photocatalyst. The cycle experiments, after four repetitions of the experiments, showed the sample still maintained a high photocatalytic activity. Finally, the photocatalytic reaction mechanism was also studied by free radical capture experiments and electron paramagnetic resonance spectroscopy .
研究领域:
环境化学
·
材料科学
·
光催化
·
纳米材料
·
环境污染治理
·
药物降解
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Ruihan Tong,Huiming Lin,Yuhua Chen,Na An,Gang Wang,Xiaofan Pan,Fengyu Qu
To integrate photodynamic therapy (PDT) with chemotherapy for enhanced anticancer efficiency, near infrared (NIR) light mediated upconversion nanoparticles@mesoporous silica (UCNPs@mSiO 2 ) nanovehicle was constructed as the nanocarrier. Based on the novel ultraviolet (UV) emission, TiO 2 (3.0–3.2 eV) was adopted as the photosensitiver (PS) on account of the high activity and excellent stability. Here, a simple host-assembly method was exploited to graft it onto the inner and outer surface of the mSiO 2 shell. On the other hand, a UV cleavable o -nitrobenzyl derivative linker (TC linker) was prepared as “gate” to encapsulate anticancer agent doxorubicin (DOX) inside mSiO 2 , insuring the few prematurity. Under NIR irradiation, the UV emission can excite TiO 2 to produce reactive oxygen species (ROS) and also can induce the photodegradation of TC linker and drug release as well. The detailed release kinetics was studied to reveal that it is TC linker to manipulate the NIR-sensitive drug release and the amount of TC linker also can be used to adjust the release performance. The synergistic action of PDT and chemotherapy displays the improved cytotoxicity of DOX-UCNPs@mSiO 2 /TiO 2 -TC to HeLa cells under NIR irradiation that makes the potential application in anticancer field due to the superior to any single means.
研究领域:
肿瘤学
·
纳米医学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 40
·e202300667
·
IF 4.3
Peng Xu,Huang Ye,Yunpeng Yao,Tingting Zhu,Junhua Luo
Graphical Multifunctional material (benzylammonium) 4 AgBiBr 8 , which has a step-like dielectric phase transition at 383 K/387 K (cooling/heating) and excellent photoelectric properties, was obtained by using rigid benzylammonium cations as templates. Layered hybrid perovskites possess exceptional semiconductor features and structural versality, making them viable candidates for developing multifunctional dielectric phase-transition materials (PTMS). However, most PTMs based on layered hybrid perovskites still suffer from Pb toxicity and low operating temperature. The recently developed hybrid double perovskites provide a new routine to designed PTMs with desired working performance and environment-friendly chemical compositions. Herein, using rigid aromatic cations as templates, we have successfully synthesized a novel double perovskite (benzylammonium) 4 AgBiBr 8 ( 1 ), which consists of corner-sharing AgBr 6 and BiBr 6 layers and benzylammonium cations. Notably, 1 exhibits a high-temperature first-order reversible solid-state phase transition at 383/387 K (cooling/heating) and switchable dielectric performance around the temperature. Compared with the soft organic chain version of the compound, the phase transition temperature of 1 shows a large enhancement of 99 K, validating the correctness of the designing strategy. In addition, 1 also exhibits semiconductor characteristics with a calculated bandgap of 2.34 eV and an optical bandgap of 2.29 eV. Remarkably, the single crystal photodetector of 1 shows a low dark current (2.12×10 −13 A), a high on/off ratio (1.77×10 3 ), and a fast response ( τ rise =125 μs and τ decay =419 μs). Such a lead-free phase transition material combined with semiconductor properties provides a new strategy to develop environmentally friendly multifunctional materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2015
·Vol. 140
·期 23
·8017-8022
·
IF 4.107
Jun Lv,Xiaonan Wang,Yuanyuan Zhang,Defeng Li,Juan Zhang,Lizhou Sun
Based on the adsorption between tetracycline (TC) and phosphate groups, a general colorimetric method is explored in this work by using TC-stabilized gold nanoparticles (TC/AuNPs) and 4-aminophenyl phosphate-functionalized Fe3O4 magnetic nanoparticles (APP/MNPs). Taking protein tyrosine phosphatase 1B (PTP1B) as an example, 4-aminophenyl phosphate (APP) can be hydrolyzed into 4-aminophenol (AP) by PTP1B, resulting in the disappearance of the phosphate group on the outer layer of MNPs and the loss of corresponding adsorptive ability. Upon addition of TC/AuNP solution, TC/AuNPs will remain in the supernatant solution after magnetic separation and a high absorbance value can be observed. So PTP1B activity is related to the concentrations of TC/AuNPs in the supernatant solution. In this work, the enzyme activity can be determined at levels as low as 0.0885 U mL−1 and over a linear detection range as wide as 0.1 U mL−1 to 0.9 U mL−1. Moreover, using the proposed method, the inhibition effect of betulinic acid (BA) and sodium orthovanadate (Na3VO4) on PTP1B activity can be tested with IC50 values of 30 μM and 4 μM, respectively. Therefore, a universal platform for the accurate colorimetric analysis of kinase and phosphatase activities can be established through the adsorption between TC and phosphate groups.
研究领域:
生物化学
·
分析化学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qianwei Chen,Fan Liu,Wenqian Liu,Ruilin He,Jieyu Zhang,Yangyang Tan,Wei Sun,Shu-Juan Bao
Hydrogen energy has garnered significant attention due to its high calorific value and minimal environmental impact. However, the high-current electrolysis of water encounters challenges such as insufficient active sites and the disruptive effects from rapidly generated bubbles. In this paper, a small amount of water was introduced to modify the strong coordination ability of metal ions with organic ligands, and prepared 2D Ni MOFs. Subsequently, thin carbon-armed Ni-based catalysts (Ni@TC NPs) were prepared through nickel-assisted low-temperature pyrolysis. Unlike other 3D MOFs, the 2D MOF thin sheets prepared in this work can decompose at low temperatures due to its thin thickness, and the exposed Ni will accelerate the carbonization of surrounding organic groups, resulting in the formation of smaller and uniformly distributed thin carbon-armored Ni@TC NPs at lower temperature. Serving as a Hydrogen Evolution Reaction (HER) electrocatalyst, Ni@TC NPs demonstrate exceptional electrocatalytic performance (low overpotential of 36.6 mV at 10 mA cm −2 , and low Tafel slope of 91.06 mV dec −1 ), and long-term stability (over 50 h at 440 mA cm −2 ). The electronic modulation between the thin carbon armor and the metal center endows Ni@TC NPs with excellent kinetic performance, while the carbon armor provides protection in alkaline environments. In addition, the small and dense bubbles that quickly escape greatly reduce the bubble shielding and oscillation effects on the electrode surface, enabling Ni@TC NPs to work stably under high currents.
研究领域:
材料科学
·
电化学
·
能源转换与储存
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
H.S. Xu,X.X. Wang,Z. Gao,H.L. Huang,Y.Z. Long,Y.L. Lu,K.B. Tang
A new iron-based superconductor Li x (C 3 H 10 N 2 ) y Fe 2 Se 2 was successfully synthesized via the novel ammonothermal technique. After post-annealing, the superconducting transition temperature T c changes from 36 K to 45 K, which is confirmed by measurements of the magnetic susceptibility and the electrical resistivity. The powder X-ray diffraction (XRD) measurements have revealed that the crystal structure keeps the same after post-annealing at 130 °C for 10 h. Hall coefficient and magnetoresistance (MR) have been measured on the annealed samples, indicating the role of electrons as the dominant charge carriers.
研究领域:
凝聚态物理
·
超导物理
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Zhu Mengting,Tonni Agustiono Kurniawan,Ram Avtar,Mohd Hafiz Dzarfan Othman,Tong Ouyang,Huang Yujia,Zhang Xueting,Tjandra Setiadi,Iswanto Iswanto
We test the feasibility of TiO 2 (B)@carbon composites as adsorbents, derived from wheat straws, for tetracycline (TC) adsorption from aqueous solutions. Hydrochar (HC), biochar (BC), and hydrochar-derived pyrolysis char (HDPC) are synthesized hydrothermally from the waste and then functionalized with TiO 2 (B), named as ‘Composite-1′, ‘Composite-2′, and ‘Composite-3′, respectively. A higher loading of TiO 2 (B) into the HC was also synthesized for comparison, named as ‘Composite-4′. To compare their physico-chemical changes before and after surface modification, the composites are characterized using FESEM-EDS, XRD , BET, FRTEM, and FTIR. The effects of H 2 O 2 addition on TC removal are investigated. Adsorption kinetics and isotherms of TC removal are studied, while TC adsorption mechanisms are elaborated. We found that the Composite-4 has the highest TC removal (93%) at pH 7, 1 g/L of dose, and 4 h of reaction time at 50 mg/L of TC after adding H 2 O 2 (10 mM). The TC adsorption capacities of the Composite-1 and Composite-4 are 40.65 and 49.26 mg/g, respectively. The TC removal by the Composite-1 follows the pseudo-second order. Overall, this suggests that converting the wheat straw into HC and then functionalizing its surface with TiO 2 (B) as a composite has added values to the waste as an adsorbent for wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2019
·Vol. 34
·期 11
·2229-2235
·
IF 3.646
Lei Tang,Wenting Bu,Xuemei Liu,Sheng Hu
The accurate determination of ultra-trace amounts of 99Tc is still a challenge due to its long half-life and the lack of a commercially available isotopic tracer. Negative thermal ionization mass spectrometry (N-TIMS) has been proven to be a powerful method for the analysis of isotopes with relatively high ionization potentials. In this work, we established a novel method based on N-TIMS for the measurement of Tc isotopes. By using Pt filaments and Ba(OH)2 as the ionization activator, the ionization efficiency of Tc was significantly improved to be more than 10%. The oxygen isotopic compositions were measured with a 99Tc standard solution and the obtained coefficients can be applied directly for the correction of interferences from oxygen isotopes. We used this method for the measurement of the isotopic abundance and concentration of the 97Tc tracer produced in our laboratory. Due to the high ionization efficiency of this method and the calibration of the 97Tc tracer, ultra-trace determination of 99Tc in radioactive wastes and environmental samples is now possible.
研究领域:
分析化学
·
环境科学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
Drug Delivery and Translational Research
·
2018
·Vol. 8
·期 5
·1090-1102
·
IF 3.395
Xie Yonghui,Liu Chenchen,Huang Hongwei,Huang Jian,Deng Aiping,Zou Ping,Tan Xueying
This study aimed to investigate the improved therapeutic efficacy and pharmacokinetic profiles of simvastatin (SIM) with imparted bone targeting potential using tetracycline-mediated PEG-PLGA (TC-PEG-PLGA) micelles in osteoporotic rats. The SIM-loaded TC-PEG-PLGA (TC-PEG-PLGA/SIM) micelles were evaluated for particle size, morphology, stability, loading efficiency, cell viability, bone mineral binding ability in vitro, mineralization, pharmacokinetics, and pharmacodynamics. TC-PEG-PLGA conjugates were successfully and could self-assembly form micelles in aqueous medium with a 19.4 μg/mL critical micelle concentration. Then, TC-PEG-PLGA/SIM micelles were prepared with solvent diffusion method, and the obtained micelles (56.21 ± 7.39 nm average size; 81.8 ± 3.1% encapsulation efficiency; and 7.56 ± 0.27% drug loading) led to the prolonged release of SIM from micelles. Cellular uptake test indicated that TC had no effects on micellar internalization and micellar internalization was mainly involved with clathrin-mediated endocytic pathway. In vivo pharmacokinetic results indicated that TC-PEG-PLGA/SIM micelles exhibited a significantly prolonged time in systemic circulation and were preferentially accumulated in bone tissue. TC-PEG-PLGA/SIM micelles showed better therapeutic effects, as reflected by the improved bone mineral density, bone mineral content, and bone mechanical strength. Overall, these results suggested that TC-PEG-PLGA/SIM micelles provide several advantages, including prolonged systemic circulation, enhanced bone tissue distribution, and improved therapeutic outcomes in osteoporotic rats.
研究领域:
药剂学
·
骨科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）