SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Xin Wang,Yingnan Liu,Qinzhi Wang,Tong Bu,Xinyu Sun,Pei Jia,Li Wang
P -nitrophenol (PNP) has been widely applied to industry processing for many purposes, but the persistence and toxicity of residuum may pose risks to human health. To analyze PNP in industrial and agricultural wastewater, a versatile fluorescent probe sensing platform was proposed. In this work, we devised a fluorescence approach that utilized nitrogen, silicon co-doped carbon dots (N,Si-CDs) to monitor PNP originating from the inner filter effect (IFE). The N,Si-CDs were generated in a one-step hydrothermal synthesis , and which possessed outstanding fluorescence signal and water-dispersity. Emission at 441 nm was monitored with excitation at 360 nm using a common spectrofluorometer. The method achieved an exceptionally low limit of detection (LOD) of 0.011 μM. Furthermore, this method not only eliminates the interference from metal ions and acid ions, but also provides a potential application prospect for N,Si-CDs in the field of water monitoring. Analysis of tap and lake water led to 93.30–106.30% recoveries and <1% relative standard deviation at 2.5–25 μM PNP concentrations.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 1
·323-331
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IF 3.119
Juan Li,Jingxin Zhu,Lan Jia,Yanlong Ma,Haijuan Wu
This paper presents a green method for fabricating dual temperature- and pH-responsive electrospun fibrous mats from an aqueous-based blend poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAAm-co-AAc)) and regenerated silk fibroin (RSF) by employing electrospinning technique. P(NIPAAm-co-AAc) was synthesized by free radical solution polymerization and its low critical solution temperature (LCST) was in the physiological range (38.8 °C). The P(NIPAAm-co-AAc)/RSF fibers were prepared by electrospinning technology in the presence of the crosslinking agents (EDC·HCl and NHS) with water as solvent. After in situ crosslinking and water-annealing process, the water-stable composite fibrous mats were obtained. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to analyze the crosslinking process. Temperature and pH dual stimuli-responsive swelling-shrinking behavior of the fibrous mats were observed when the temperature was below and above the LCST of the copolymer at different pHs. In addition, rhodamine B-loaded the fibrous mats also showed dual temperature and pH controlled release behavior, demonstrating the potential use of the fibrous mats for “smart” controlled drug delivery applications.
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Nanoscale
·
2019
·Vol. 11
·期 47
·23027-23034
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IF 6.97
Fei Xiao,Zhimin Chen,Hao Wu,Ying Wang,Erping Cao,Xiaodong Lu,Yiqun Wu,Zhiyu Ren
Nanostructure engineering of heteroatom-doped carbon catalysts can greatly enhance their electrocatalytic activity by increasing the accessible active sites and beneficial physical properties (e.g., surface area, conductivity, etc.). Herein, we successfully constructed ultra-thin N,P co-doped carbon (NPC) on the surface of multi-walled carbon nanotubes (CNT) by using phytic acid (PA) as a “guide”. The rich phosphate groups in PA allow them to be covalently modified on the surface of CNT by the condensation reaction and to further attract large aniline monomers through acid–base interactions, resulting in the uniform and tight bonding between polyaniline and CNT after the polymerization process. During the subsequent thermal reaction, PA also serves as a self-sacrificial dopant for the formation of ultra-thin NPC and the doping amount of P in NPC can be easily adjusted by changing the amount of PA. Due to the abundance of active sites, large electrochemically active surface area and rapid electron transfer, the developed CNT@NPC presents remarkable electrocatalytic activities for the hydrogen evolution reaction (HER) with an overpotential of 167, 440 and 304 mV to reach a current density of 10 mA cm−2 in acidic, neutral, and alkaline electrolytes, respectively. In particular, its acidic HER activity exceeds that of most reported metal-free electrocatalysts and is comparable to that of some excellent transition metal-based catalysts. The approach proposed here is of potential importance for the preparation of ideal heteroatom-doped carbon/nanocarbon composites for use in a variety of future energy conversion systems.
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HYDROMETALLURGY
·
2019
·
IF 3.465
Shunyan Ning,Shichang Zhang,Wei Zhang,Jie Zhou,Siyi Wang,Xinpeng Wang,Yuezhou Wei
The separation of fission products Ru, Rh, and Pd will benefit both the nuclear fuel cycle and enlarge the platinum group metals source. A silica-based iso Bu-BTP/SiO 2 -P adsorbent was used to separate Ru, Rh, and Pd from nitrate solution. It exhibited good adsorption towards Ru, Rh, and Pd with the uptake rates over 95% at 55 °C in 0.1 M HNO 3 –3 M NaNO 3 solution and no adsorption towards 238 U(VI). The adsorption towards Ru, Rh, and Pd matched well with pseudo-second-order model with the equilibrium obtained within 24 h, 24 h and 0.5 h and Langmuir adsorption isotherm model with the saturation adsorption amounts as high as 0.37 mmol/g, 0.34 mmol/g and 0.71 mmol/g respectively. The adsorbed Pd, Rh, and Ru can be desorbed by 0.1 M HNO 3 –0.1 M thiourea , 2 M HCl and NaClO solution (CP) which is expected to realize their mutual separation in desorption stage using the above-mentioned eluents successively. Both FT-IR and XPS revealed that C N C played key role during adsorption and the adsorption needed the participation of NO 3 − to keep charge balance. In a word, iso Bu-BTP/SiO 2 -P is a promising adsorbent for separation and recovery Ru, Rh, and Pd, especially in the case of separating them from other fission products and actinides from high level liquid waste .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jingjing Xu,Chen Liu,Junfeng Niu,Yanlin Zhu,Biying Zang,Mengjuan Xie,Mindong Chen
LaFeO 3 /Bi 3 NbO 7 p-n heterojunction photocatalysts were prepared successfully through an in-situ growth method. The phase structure, optical property , morphology and microstructures of the obtained samples were studied by X-Ray diffractometer (XRD), Ultraviolet–visible absorption spectrum (UV–vis DRS), photoluminescence (PL) spectroscopy, transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM). The visible light responsive photocatalytic activity of as-obtained samples were investigated by the photo-reduction of Cr (Ⅵ). The effects of preparation conditions (proportion of BNO/LFO and temperature) on the activity were studied. Results showed that the as-obtained BNO-LFO-200-5 composite behaved the best photocatalytic activity (with rate constant of 0.0212 min −1 ) among all the obtained samples. The rate constant was about 42.4-times and 17.7-times as that of pristine BNO (0.0005 min −1 ) and LFO (0.0012 min −1 ), respectively. The enhanced photocatalytic property of the as-prepare LaFeO 3 /Bi 3 NbO 7 composites can be ascribed to the formation of p-n junction between BNO and LFO, which significantly increased the separation efficiency of photo-excited electron-holes.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xue Liu,Jiao Li,Yue Huang,Zhongrong Zhang,Qing Lin,Pengliang Xia,Fanyu Kong,Jun Qiu,Song Fang,Xiude Hua
Quizalofop-p-ethyl is a widely used herbicide that poses a threat to human health and environmental safety. In this study, anti-quizalofop-p-ethyl monoclonal antibodies (mAbs) were prepared and used to develop a gold nanoparticle-based lateral flow immunoassay (AuNP-LFIA) for the detection of quizalofop-p-ethyl in agriproducts and environmental samples. Four hybridoma cell lines were obtained, among which 5B6D10E11 secreted mAb with the highest sensitivity, with a 50 % inhibition concentration of 4.57 ng/mL in the indirect competitive enzyme-linked immunosorbent assay. After optimization, the AuNP-LFIA strip based on the mAb (5B6D10E11) showed a visual detection limit of 10 ng/mL, and the results could be directly determined by the naked eye within 8 min. The cross-reactivity of the AuNP-LFIA for analogs of quizalofop-p-ethyl was negligible except for quizalofop-p-acid. The established AuNP-LFIA was proven to be accurate and precise based on the recovery test. Furthermore, the detection results of AuNP-LFIA were consistent with those of ultra-high-performance liquid chromatography tandem mass spectrometry.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yaqi Zhang,Linli Tan,Na Han,Shiwei Tian,Wei Li,Wei Wang,Yutong Wu,Zhongshun Sun,Xingxiang Zhang
The separation of oil-in-water and water-in-oil emulsions with high efficiency and environmental friendly remains a challenge in the past decade. This work describes a new method to improve the trade-off of the poly(acrylonitrile- co -methyl acrylate) (P(AN-MA))-based membrane for water/oil separation. P(AN-MA) microfiltration (MF) membrane was fabricated via thermally induced phase separation (TIPS) method in this study. Then, some of the –CN groups and –COOCH 3 groups were converted to –COOH groups via hydrolyzing. Finally, the selected wettability was attained by grafting PEI on one side while ZIF-8 was anchored to the other side via self-assembly and in-situ interfacial reaction methods. The ZIF-8/P(AN-MA) hybrid MF membranes are superoleophobic underwater on the PEI side while super-hydrophobic under oil on the ZIF-8 side, which can efficiently and accurately separate oil-in-water and water-in-oil emulsions at a low pressure (0.01 MPa). The separation fluxes of the PEI side were as high as 3053 L/m 2 h and 1035 L/m 2 h respectively, for the surfactant-free mixtures and surfactant-stabilized emulsions. For water-in-oil emulsions, the fluxes were up to 2316 L/m 2 and 878 L/m 2 h on the ZIF-8 side, respectively. The separation efficiency of all the mixtures and emulsions was higher than 97.5 %. Moreover, the Janus membranes showed excellent anti-oil-fouling and anti-water-fouling properties on the two sides of the membranes, as well as remarkable durability during the 10 cycles in oil/water separation. Hence, Janus ZIF-8/P(AN-MA) hybrid MF membranes show potential application prospects in oil/water separation.
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SOLID STATE SCIENCES
·
2026
·
IF 3.6
Xiaohan Du,Chenxi Sun,Chengyang Zhang,Mengmeng Zhen
A hierarchical P-TiO 2 @CNTs heterostructure is fabricated via synergistic defect and architecture engineering. • P-doping in situ triggers abundant oxygen vacancies and optimizes electronic structure for fast Na + transport. • 3D CNT network guides vertical growth of ultrathin TiO 2 nanosheets and suppresses agglomeration. • The P-TiO 2 @CNTs anode exhibits ultra-long cycling stability with 0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 . A hierarchical P-TiO 2 @CNTs heterostructure is rationally designed via synergistic defect and architecture engineering for high-performance sodium-ion batteries. The CNT backbone acts as both a conductive network and a structural template to direct the vertical growth of ultrathin TiO 2 nanosheets, effectively suppressing agglomeration and shortening Na + diffusion paths. P-doping not only induces abundant surface oxygen vacancies to optimize the electronic band structure, and enrich active sites but also modulates lattice interspacing for accelerated Na + diffusion. Benefiting from the synergy of P-doping-triggered vacancies and 3D conductive CNT networks, the P-TiO 2 @CNTs anode delivers exceptional rate capability and ultra-long cycling stability (0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 ). This work provides a universal strategy for integrating defect engineering and hierarchical architecture design to develop advanced TiO 2 -based anodes for high-power and long-life sodium-ion storage. Download: Download high-res image (351KB) Download: Download full-size image
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2013
·
IF 2.906
Shou-Zheng Tian,Xiang Pu,Guoyong Luo,Li-Xing Zhao,Li-Hua Xu,Wen-Jun Li,Yinggang Luo
A new p-terphenyl 1 and a novel p-terphenyl derivative 3 bearing a benzothiazole moiety were isolated from halophilic actinomycete Nocardiopsis gilva YIM 90087, along with known p-terphenyl 2, antibiotic novobiocin 4, cyclodipeptides 5–13, and aromatic acids 14 and 15. Their structures were elucidated on the basis of the interpretation of spectral data and by comparison of the corresponding data with those reported previously. The p-terphenyl 1 showed antifungal activity against the three pathogenic fungi, including Fusarium avenaceum, Fusarium graminearum, and Fusarium culmorum, that caused Fusarium head blight with minimal inhibitory concentrations (MICs) of 8, 16, and 128 μg/mL, respectively. Compound 1 showed antifungal activity against Candida albicans with a MIC of 32 μg/mL and antibacterial activity against Bacillus subtilis with a MIC of 64 μg/mL. Novobiocin 4 showed antifungal activity against Pyricularia oryzae with a MIC of 16 μg/mL and antibacterial activity against B. subtilis with a MIC of 16 μg/mL and Staphylococcus aureus with a MIC of 64 μg/mL. The 1,1-diphenyl-2-picryl-hydrazyl assay suggested that 1, 3, and 4 exhibited 54.9% (2 mg/mL), 14.3% (4 mg/mL), and 47.7% (2 mg/mL) free radical scavenging activity, respectively. The positively charged 2,2′-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid radical (ABTS+•) scavenging assay indicated that 1, 3, 4, and 8 exhibited 68.6% (1 mg/mL), 28.4% (2 mg/mL), 78.2% (0.5 mg/mL), and 54.6% (2 mg/mL) ABTS+• scavenging capacity, respectively. The superoxide anion radical scavenging assay suggested that 4 exhibited 77.9% superoxide anion radical scavenging capacity at 2 mg/mL. N. gilva YIM 90087 is a new resource for novobiocin 4.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Jinghua Li,Yiwen Ou,Lijuan Wang,Yue Zheng,Weiyun Xu,Jianbiao Peng,Xin Zhang,Zhiguo Cao,Junpei Ye
For the bioremediation of mixed-contamination sites, studies on polycyclic aromatic hydrocarbon (PAH) degradation or Cd (II) tolerance in bacteria are commonly implemented in nutrient-rich media. In contrast, in the field, inocula usually encounter harsh oligotrophic habitats. In this study, the environmental strain Paraburkholderia fungorum JT-M8 was used to explore the overlooked Cd (II) defense mechanism during PAH dissipation under P-limited oligotrophic condition. The results showed that the growth and PAH degradation ability of JT-M8 under Cd (II) stress were correlated with phosphate contents and exhibited self-regulating properties. Phosphates mainly affected the Cd (II) content in solution, while the cellular distribution of Cd (II) depended on Cd (II) levels; Cd (II) was mainly located in the cytoplasm when exposed to less Cd (II), and vice versa. The unique Cd (II) detoxification pathways could be classified into three aspects: (i) Cd (II) ionic equilibrium and dose–response effects regulated by environmental matrices (phosphate contents); (ii) bacterial physiological self-regulation, e.g., cell surface-binding, protein secretion and active transport systems; and (iii) specific adaptive responses (flagellum aggregation). This study emphasizes the importance of considering culture conditions when assessing the metal tolerance and provides new insight into the bacterial detoxification process of complex PAH-Cd (II) pollutants.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 6
·1-10
·
IF 20.1
Zou Tao,Zhang Dongqiao,Shen Kuangyu,Huang Zhenduo,Xu Tao,Peng Xiaohong,Zhang He,Du Yanliang,Sun Luyi
Recently, many efforts have been devoted to studying early-stage fire-warning materials (EFWMs). Among those, thermoelectric effect-based EFWM (TE-EFWMs) are particularly attractive because they are self-powered and intrinsically sensitive to temperature. However, none of the reported fire-warning response times of TE-EFWMs can reach 1.0 s. Herein, flame-retardant composite cotton fabrics with speedy and repeatable fire warning function (denoted as CF-TE-FR) were constructed by in-situ polymerized polypyrrole (PPy) doped with P-toluenesulfonic acid (PTSA) and a flame retardant composite layer composed of sodium montmorillonite (MMT) and ammonium polyphosphate (APP). The fire warning performance of CF-TE-FR was effectively enhanced through PTSA doping, and the fire warning response time was shortened with an increasing concentration of PTSA. The fire warning indicator could be triggered as fast as 0.8 s when the molar ratio of PTSA to pyrrole monomer reached 1:3. Meanwhile, all the CF-TE-FR samples could release the fire-warning signals repeatedly. This work proposes a facile approach to the fabrication and application of organic thermoelectric polymer-based materials with ultrafast fire-warning response, repeatable fire-warning capability, and excellent flame retardancy. Graphical abstract Flame-retardant cotton fabrics based on the thermoelectric effect of polypyrrole demonstrate speedy and repeatable fire warning function.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Quan Li,Xing Wang,Xiaolan Cui,Xin Liu,Wentai Wang
Hydrogen peroxide (H 2 O 2 ) is a major transmitter of redox signals during chemical processes. Cost-effective and easy-to-operate sensors for H 2 O 2 are in high demand in a variety of fields. A novel photoelectrochemical (PEC) sensor for H 2 O 2 detection was investigated, using BiOBr/TiO 2 NAs/FTO (BiOBr/TNAs) as a PEC electrode which is obtained by successive ionic layer adsorption and reaction (SILAR) method. This non-enzymatic PEC BiOBr/TNAs electrode shows excellent selectivity, stability, and reproducibility for H 2 O 2 detection in optimizing modes. The linear relationship is in a broad range from 4 to 1800 μM (R 2 = 0.994) and a detection limit of 0.65 μM (S/N = 3). In the detection of H 2 O 2 in apple juice and milk real samples, the BiOBr/TNAs show outstanding recovery ranging from 98.0 % to 102.0 %, indicating great potential in practical applications. Meanwhile, the p-n heterojunction formed between BiOBr and TiO 2 improves the utilization of visible light and effectively promotes the separation of photogenerated electrons and holes. This work provides a new strategy for the non-enzymatic detection of hydrogen peroxide in PEC mode.
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