NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 4
·1960-1971
·
IF 3.591
Wen He,Yongbo Xie,Qiang Yin,Zixuan Zhao,Lang Shi,Hongqing Wang
Scientists are still working on developing a “turn-on” fluorescence sensor for Co2+, especially in acidic solutions. A novel “on–off–on” fluorescence sensor based on g-C3N4 nanosheets was designed and prepared in this paper. It was able to detect (2-(5-bromo-2-pyridylazo)-5(diethylamino)phenol (abbreviated to 5-Br-PADAP) and Co2+ quantitatively by quenching and restoring the fluorescence of the g-C3N4 nanosheet system, respectively. Also discussed are the effects of solvent, pH, order of addition, and interaction time of 5-Br-PADAP and Co2+, as well as the concentration range of the object on measurement. Furthermore, in acidic conditions, the sensor demonstrated good selectivity and sensitivity. In the solvent system EtOH : H2O (v/v = 1 : 9, pH = 3), the fluorescence intensity had a good linear relationship with 5-Br-PADAP and Co2+ concentrations in the ranges of 0–15 μM and 0–10 μM, with low detection limits of 64 nM and 44 nM, respectively. Experiments and theoretical calculations were used to describe the interaction characteristics and sensing mechanism. It was eventually successful in detecting Co2+ in environmental samples.
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Foods
·
2021
·Vol. 10
·期 11
·2735
·
IF 4.35
Chujun Liu,Yawen Guo,Bo Wang,Lan Chen,Kaizhou Xie,Chenggen Yang
A simple and sensitive gas chromatography–tandem mass spectrometry (GC–MS/MS) method was established for the quantitative screening of penicillin G residues in chicken and duck eggs (whole egg, yolk and albumen). The analyte was separated on a TG-1MS capillary column (30.0 m × 0.25 mm i.d., 0.25 μm) with an external calibration method and electron impact (EI) ionization. Samples were pretreated using an accelerated solvent extraction (ASE) procedure followed by solid-phase extraction (SPE) on HLB cartridges (60 mg/3 mL). The derivative, which was safer and easier to store than penicillin G, was obtained by reacting trimethylsilyl diazomethane (TMSD) with penicillin G. The method was validated by the following parameters: linearity, accuracy, precision, limit of detection (LOD) and limit of quantification (LOQ). The matrix-matched calibration curves had good linearity (R2 ≥ 0.9994) within the concentration range of LOQ–200.0 µg/kg for penicillin G in the sample matrices. In the same concentration range, the accuracy, in terms of recovery, was 80.31–94.50%; the relative standard deviation (RSD), intra-day RSD and inter-day RSD ranged from 1.24 to 3.44%, 2.13 to 4.82% and 2.74 to 6.13%, respectively. The LODs and LOQs of penicillin G in the matrices were in the ranges of 1.70–3.20 and 6.10–8.50 μg/kg, respectively. The applicability of the GC–MS/MS method was demonstrated by the determination of poultry eggs obtained from local markets with no penicillin G residues.Keywords:penicillin G;GC–MS/MS;ASE;poultry eggs;SPE
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.262
Tian Ma,Yunhai Wu,Ningning Liu,Xiaoming Tao,Yunying Wu
In this work, iron-doped graphite carbon nitride (Fe-g-C3N4) was integrated with CoMoO4 through a simple hydrothermal route and high temperature calcination to synthesize distinctive composites, aiming to create a promising heterogeneous catalyst to active peroxymonosulfate (PMS) for the degradation of methylene blue (MB), a widely used organic dye. The characterization results, including SEM, EDX, FTIR, XRD and XPS, indicated that the crystal structure and physicochemical properties of CoMoO4-Fe-g-C3N4 have changed after modification, with rougher surface and efficient catalytic activity. The effects of several operational factors (catalyst dosage, oxidant dosage, reaction temperature and initial pH) were also extensively evaluated. Under the condition of CoMoO4-Fe-g-C3N4=0.1 g L−1, oxidant = 2.0 mM, dye = 100 mg/L, T = 25 °C, the MB in the CoMoO4-Fe-g-C3N4/PMS catalytic system can reach almost complete degradation in 90 minutes without pH adjustment. Further, stability experiment showed that the CoMoO4-Fe-g-C3N4 catalysts exhibited high stability and superior reusability, with 80% removal rate even after five concessive cycles of use. Additionally, through radical quenching experiments, it proved that SO4•− radicals were dominant and HO• radicals also worked in the MB degradation process. An underlying mechanism was proposed based on the detection of XPS results that both radical and non-radical degradation pathways existed during MB degradation process. The electron transfer from high-valence iron species (FeIV=O) to MB resulting in the degradation of MB through a non-radical mechanism. From the investigation, the CoMoO4-Fe-g-C3N4 composite was proved to have potential superiority as a promising catalyst for the degradation of refractory organic contaminant removal from water.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wenxiu Li,Wei Li,Zanwu Guo,Yi Song,Shaoru Tang,Yanan Ma,Xueqing Xing,Qian Wang
The atomically thin nanosheets of graphitic carbon nitride (g-C3N4) with mesopores have been successfully exfoliated with supercritical CO2 (scCO2). The thickness of the as-synthesized samples could be directly tailored by simply regulating the scCO2 pressure. The obtained bilayer mesoporous g-C3N4 nanosheets doped with monatomic Co through a microwave-assisted approach havve been employed as single-atom catalysts to enhance the photocatalytic hydrogen evolution performance. The as-prepared Co/P/CN-sc sample exhibited a boosted H2 production performance due to its unique structural advantages by exposing more active sites and facilitating the separation of charge carriers. Based on X-ray photoelectron spectroscopy, steady-state and time-resolved photoluminescence spectroscopy, X-ray absorption fine structure measurement, and density functional theory (DFT) calculations, a possible mechanism has been proposed. The work shows a new perspective for designing an inexpensive photocatalyst with a unique structure through a facile and green approach for photocatalytic hydrogen evolution.
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NEW JOURNAL OF CHEMISTRY
·
2023
·
IF 3.3
Weilong Zhang,Xian Li,Huan Cheng,Jie Yang,Jumei Li
Herein, hollow hZrO2/g-C3N4 composite photocatalysts were successfully fabricated using polymethylacrylic acid (PMAA) nanospheres as sacrificial templates via reflux-precipitation polymerization and subsequent ZrO2 layer coating by sol–gel method over PMAA nanospheres, calcining process, and forming composites with g-C3N4 in sequence. The formation mechanism of the unique composites was proved by FESEM, TEM, XPS, XRD, and EDX mapping characterizations. The photodegradation tests of methylene blue (MB) and ciprofloxacin (CIP) were used to investigate the photocatalytic activity. The results revealed that hZrO2/g-C3N4 exhibited significantly boosted photocatalytic activity for degrading 99.7% methylene blue and 81.5% ciprofloxacin in 120 min under simulated sunlight irradiation (Xe lamp, 500 W), which was much better than that of hZrO2 (42.1% for MB and 19.1% for CIP). The enhanced performance is presumably attributed to the synergetic interaction of the two components and the efficient separation of the photoproduced electron–hole pairs between ZrO2 and g-C3N4, which was verified using photocurrent and EIS characterizations. On the basis of the scavenging studies of free radicals (e−, h+, ˙O2−, and ˙OH), the mechanism of the boosted photocatalytic activity was proposed. More significantly, the composites presented excellent reusability confirmed by cyclic photocatalytic degradation experiments, which is crucial for the sustainable and green applications of photocatalysts.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Tai Ye,Haohao Chen,Long Bai,Min Yuan,Hui Cao,Liling Hao,Xiuxiu Wu,Fengqin Yin,Fei Xu
Due to the threat of lead pollution to health, environmental and food safety, developing simple and fast detection methods is highly required. Whereas, traditional single-mode probe suffers from limited application scenario. In this study, a colorimetric and fluorometric dual-mode probe for Pb 2+ determination was constructed by using bifunctional G-quadruplex-hemin complex. In this dual-mode probe, enzyme strand and substrate strand of 8–17 DNAzyme are labeled with G-quadruplex-hemin complex and fluorophore, respectively. In the absence of Pb 2+ , the self-assembly of enzyme strand and substrate strand inhibits intrinsic mimic peroxidase of G-quadruplex-hemin complex by base-pairing, which also quench the fluorescence via in proximity effect. When the DNAzyme is activated by Pb 2+ , the quenched fluorescence is restored as well as the inherent peroxidase mimetic activity, leading to dual signal output. Under optimal conditions, this dual-mode probe exhibit a good linear relationship between logarithm of Pb 2+ concentration and signal difference within the range from 1.5 nM to 20 nM and 0.5 nM to 10 nM for colorimetric and fluorescence mode, respectively. The detection limits for the corresponding mode were estimated to be 1.29 nM and 0.16 nM, respectively. This dual-mode probe also successfully applied for the spiked river water assay with satisfactory recovery in the range of 93.2 %–115.3 %. This work paves a new way for DNAzyme based dual-mode probe construction.
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Journal of Pharmaceutical Analysis
·
2023
·
IF 8.8
Zhiqiang Zhang,Li Wang,Xia Ma,Hui Wang
A series of biodegradable nanoparticle-based drug delivery systems have been designed utilizing poly(β-amino ester)-guanidine-phenylboronic acid (PBAE-G) polymers. In this study, a novel Lentinan-Functionalized PBAE-G-nanodiamond system was developed to carry ovalbumin (LNT-PBAE-G-ND@OVA). The impact of this drug delivery system on the activation and maturation of macrophages was then assessed. Furthermore, LNT-PBAE-G-ND@OVA induced potent antibody response and showed no obvious toxicity in vitro and in vivo . Moreover, treatment with LNT-PBAE-G-ND@OVA was sufficient to alter the expression of genes associated with the cGAS-STING pathway, and the LNT-PBAE-G-ND@OVA induced upregulation of costimulatory molecules. LNT-PBAE-G-ND@OVA treatment was sufficient to induce macrophage activation through a complex mechanism in which cGAS-STING signaling plays an integral role.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Qiang Liu,Hao Li,Ling Kong,Yiming Du,Yunsheng Da,Zhouping Sun,Yong Dong,Yanyan Liu,Hua Wang
Due to the low volatile organic compound (VOC) emissions, waterborne coatings are gaining much attention. However, the weak barrier properties prevent them from being practical. In this study, a novel well-dispersed low-defective the g-C 3 N 4 nanosheets are successfully prepared using urea and polydopamine, followed by the preparation of an extensible bio-inspired coating. The bio-inspired coating comprises of PDA@g-C 3 N 4 nanosheets that are oriented and possess zigzag channels, rendering them impervious to corrosion factors. Electrochemical tests have demonstrated that the bio-inspired coating displays a substantially improved resistance of 1.18 × 10 10 Ω cm 2 , surpassing the pure epoxy coating (6.77 × 10 7 Ω cm 2 ) by three orders of magnitude. Moreover, the excellent corrosion resistance of the bio-inspired coating has been substantiated through salt spray tests. The development of bio-inspired composite coatings presents a novel avenue for investigating the synthesis of waterborne epoxy coatings with exceptional performance.
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MOLECULES
·
2023
·Vol. 28
·期 23
·7846
·
IF 4.6
Ligang Ma,Wenjun Jiang,Chao Lin,Le Xu,Tianyu Zhu,Xiaoqian Ai
Ultra-thin two-dimensional materials are attracting widespread interest due to their excellent properties, and they are becoming ideal candidates for a variety of energy and environmental photocatalytic applications. Herein, CdS nanorods are successfully grown in situ between a monolayer of g-C3N4using a chemical water bath method. Continuous ultrasound is introduced during the preparation process, which effectively prevents the accumulation of a g-C3N4layer. The g-C3N4@CdS nanocomposite exhibits significantly enhanced photocatalytic activity for hydrogen production under visible-light irradiation, which is attributed to a well-matched band structure and an intimate van der Waals heterojunction interface. The mechanism of photocatalytic hydrogen production is discussed in detail. Moreover, our work can serve as a basis for the construction of other highly catalytically active two-dimensional heterostructures.Keywords:monolayer g-C3N4;CdS;heterojunction;photocatalytic hydrogen production
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IONICS
·
2023
·Vol. 29
·期 12
·5491-5503
·
IF 2.8
Ren Shufang,Cao Li,Liu Xiaohang,Cui Wangyong,Lv Rui,Guo Tong,Wang Qingtao,Zheng Zhixiang
The detection of norfloxacin (NOR) is crucial because the overdoes and accumulation may result in residues in environment in animal-derived foods, which can destroy ecology and cause disease for people. A molecularly imprinted electrochemical sensor based on g-C 3 N 4 /Cu-MOF was constructed for the selective detection of norfloxacin in this paper. The g-C 3 N 4 /Cu-MOF was synthesized by melamine pyrolysis and solvothermal method followed by ultrasonic mixing. After drop casting g-C 3 N 4 /Cu-MOF on glassy carbon electrode, the molecularly imprinted film was synthesized by electropolymerization. The composite was analyzed by powder X-ray diffractometer, field emission scanning and transmission electron microscope, and Fourier transform infrared spectroscopy. The electrochemical properties of the sensor were characterized by cyclic voltammetry, electrochemical impedance spectroscopy, and pulse voltammetry. The results show that the composite of g-C 3 N 4 /Cu-MOF efficiently decreased the charge transfer resistance of electrode and improved the electron transfer kinetic between analyte and electrode with the improved current response and increased active area. After optimizing conditions of the ratio of functional monomers to template molecules, the number of polymerization cycles, accumulation time, electrolyte pH, and the sensor exhibits excellent response toward NOR with the linearity range of 0.02–0.1 μmol/L and 1–120 μmol/L and the limit of detection of 6.67 nmol/L. Moreover, it shows good selectivity, anti-interference, and reproducibility properties. In the real sample detection of pharmaceutical formulations, serum and milk, the sensor shows an acceptable recovery rate and standard deviation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan Dong,Sheng Liu,Wenjing Deng,Hao Zhang,Guangyi Liu,Xiaolei Wang
Heteroatom doping is a possible way to regulate the catalytic capability of electrocatalysts for hydrogen evolution reaction (HER). This work focuses on the development of bimetallic Cobalt-Iron sulfide ultrathin nanosheets supported on the graphitic carbon nitride (g-C 3 N 4 ) catalyst as efficient HER electrocatalysts (CoS 2 /FeS 2 /CN) with good stability at wide pH value. The ultrathin nanosheet exposes more active sites and enhances the catalyst activity. Electrochemical experiments demonstrate that adding g-C 3 N 4 and Fe to CoS 2 increases its catalytic activity and stability. Furthermore, g-C 3 N 4 and Fe co-doped with CoS 2 can modulate electronic structures on the interface. The CoS 2 /FeS 2 /CN exhibits outstanding HER performance, reaching a current density of 10 mA cm −2 with overpotentials of only 76.5 mV in an acidic solution and 175.6 mV in an alkaline solution. It also demonstrates exceptional durability, superior to commercial platinum/carbon catalysts. This work introduces a promising approach for designing low-cost, high-performance HER electrocatalysts with a wide pH range.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingyu Zhan,Yunxiong Zeng,Zhilong Zhang,Yingchun Xia,Jingcai Xu,Bo Hong,Xinqing Wang
Antibiotic pollution has potential toxicities to living organisms and the ecological environment and draws great concern of researchers. Photocatalytic degradation of antibiotics by g-C 3 N 4 shows an unsatisfied activity due to the low utilization efficiency of photogenerated electrons and severe charge recombination. A main reason is the neglect of the utilization of electrons at the depth of the material surface. Herein, we report local microenvironment rearranged g-C 3 N 4 (V C, N -CN 6 ) with intrinsic gradient concentration nitrogen (V N ) and carbon vacancy (V C ) via KBH 4 etching followed by water oxidation, enabling a complete photocatalytic degradation (≥99.6%) of TC within 3 min under visible light. This photoactivity has a universality, and can completely visible-light photodegrade sulfadiazine and ciprofloxacin in a short time. Such an extraordinary activity is ascribed to cooperation between gradient V N modulating utilization of internal electron and V C enhancing reactive species generation. Additionally, photodegraded pathways, intermediates, and risks of TC photocatalytic degradation were elucidated by the HPLC-MS and quantitative structure-effect relationship mathematical model. This work enriches the toolbox to engineer the local microenvironment of photocatalysts to upgrade the utilization of internal photoexcited electrons and heighten TC photocatalytic degradation efficiency.
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