Frontiers in Chemistry
·
2021
·
IF 5.221
Duan Rongshuai,Fang Xiao,Wang Dongliang
Due to the abuse of antibiotics in clinical, animal husbandry, and aquaculture, drug-resistant pathogens are produced, which poses a great threat to human and the public health. At present, a rapid and effective drug sensitivity test method is urgently needed to effectively control the spread of drug-resistant bacteria. Using methylene blue as a redox probe, the electrochemical signals of methylene blue in drug-resistant Escherichia coli strains were analyzed by a CV method. Graphene ink has been used for enhancing the electrochemical signal. Compared with the results of the traditional drug sensitivity test, we proposed a rapid electrochemical drug sensitivity test method which can effectively identify the drug sensitivity of Escherichia coli. The sensitivity of four E. coli isolates to ciprofloxacin, gentamicin, and ampicillin was tested by an electrochemical drug sensitivity test. The respiratory activity value %RA was used as an indicator of bacterial resistance by electrochemical method.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 47
·67098-67107
·
IF 4.223
Long Yingtao,Liang Jianjun,Xue Yinghao
A novel composite (nZVI/Pd-AC) was prepared by loading nanoscale zero-valent iron (nZVI) and Pd on activated carbon (AC) electrode under electrodeposition with ultrasound, which was used to reductive degradation of methylene blue (MB). The loading contents of Fe and Pd in composite materials were 15.84% and 2.06%, respectively. XPS results further confirmed that the as-prepared material contained Fe 0 and Pd 0 . Without external conditions, MB could be degraded in the presence of nZVI/Pd-AC and reached equilibrium within 180 min. To investigate the reusability, the re-electrodeposition strategy was effective to refresh the active sites of nZVI/Pd-AC, and the removal efficiency only reduced by 4.51% in five circles indicating the good reusability of nZVI/Pd-AC composites. GC–MS was used to identify possible degradation pathways of MB; the results showed that the degradation products were mainly N, N-dimethylaniline and 2-amino-5-dimethylamino-benzenesulfonic acid. And the S–C, C–N bonds are the sites easier to be attacked. Graphical abstract
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·147513
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IF 3.721
Yonghong Li,Ying Ji,Yuan Li,Yutong Li,Guodong Ma,Xinsheng Liu
A poly (methylene blue)/copper nanowires modified nano-carbon paste electrode (PMB/CuNWs@nano-CPE) was developed for ultra-sensitive detection of luteolin. The morphology of copper nanowires was characterized by transmission electron microscopy (TEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were utilized to investigate the electrochemical properties of the fabricated electrodes. In comparison with bare nano-carbon paste electrodes (nano-CPE), the PMB/CuNWs@nano-CPE presented better electrocatalytic activity towards luteolin, including reduced oxidation peak potential and enhanced oxidation peak current. The influencing factors on sensitivity were discussed, such as instrumental parameters, concentration of methylene blue, electropolymerization cycles, the amount of copper nanowires, pH value, accumulation potential and accumulation time. Under optimal conditions, two linear calibration ranges of 0.5 nM−0.01 μM and 0.01 μM−1 μM and the detection limit (LOD) of 0.1 nM (S/N = 3) were obtained for luteolin. The satisfying results were achieved for the determination of luteolin in Chinese medicine capsule samples.
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CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·340-347
·
IF 1.835
Pan Guoxiang,Xu Minhong,Zhou Kai,Meng Yue,Chen Haifeng,Guo Yuhua,Wu Tao
To apply hydrotalcites more effectively to the problem of dye wastewater, the effects of divalent metal ions on the structure and stability of hydrotalcites, especially on their photocatalytic activity, were compared. In the present study, M /Cr hydrotalcites ( M 3 Cr-CO 3 -LDHs) (in which M = Mg, Co, Ni, Cu, Zn), where the M /Cr molar ratio was 3, were prepared by the co-precipitation method. The structures and properties were characterized using powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential thermal analysis (TG-DTA), and UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS). The results showed that five kinds of M 3 Cr-CO 3 -LDHs were synthesized successfully, and the layered structure of the samples obtained was regular and the crystal phase was single. When methylene blue (MB) solution was exposed to ZnCr-CO 3 -LDHs, H 2 O 2 , and visible light irradiation, more than 90.67% of the methylene blue (MB) was removed after 140 min. The photocatalytic activity of the samples was in the order: Co 3 Cr-CO 3 -LDHs > Mg 3 Cr-CO 3 -LDHs > Cu 3 Cr-CO 3 -LDHs > Zn 3 Cr-CO 3 -LDHs > Ni 3 Cr-CO 3 -LDHs. The results of a catalytic mechanism study showed that photocatalytic degradation of MB involved a demethylation reaction, with the reactive species containing •O 2 - , •OH, and h + .
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Meng-Jie Cui,Jian-Zhe Jiang,Zong-He Song,Tie-Zhen Ren
The dye organic pollutants with utilization in chemical industries have been discharged into the environment, causing the water pollution and human disease. Therefore, developing a cheap, reliable and sustainable wastewater cleaning technology is of great importance. Transitional metal is often one of the active photocatalysts for degradation of dye pollution. Among them, Cu has attracted attention due to low price and catalytic activity. In this article, we took Cu sheets as raw materials and used a simple salting-out method to prepare Cu 2 Cl(OH) 3 nanocomposites, which exhibited a photocurrent response under the UV light. At the same time, the structural transformation process from Cu sheet to nanoparticle Cu 2 Cl(OH) 3 was observed over time. The results showed that Cu 2 Cl(OH) 3 displayed significant photocurrent response. In addition, in order to further improve its catalytic performance, Cu 2 Cl(OH) 3 was modified by different concentrations of carbon dots (CDs) and a wide UV light absorption received. Corresponding to it, 1CDs@OHCu was efficient to the photodegradation of methylene blue (MB) within 3 h compared to the mother sample. The physical properties of prepared samples were studied through XRD, UV–vis spectra, SEM, etc. The related kinetic rate of the process of degrading MB was recorded to determine the role of CDs. The intermediates produced during the photo-reaction was monitored via the chemical trapping agent. By analyzing the characteristics and electrochemical features of prepared samples, the catalytic active center was explored. Finally, stability analysis showed that 1CDs@OHCu could be recycled at least 8 times.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yan Li,Ziqian Liu,Xin Wan,Lingying Xie,Hui Chen,Guo Qu,Han Zhang,Yue-Fei Zhang,Shicheng Zhao
In this work, xanthan gum-based composites were successfully graft-modified by amantadine (XG-Fe 3+ /AM) with higher adsorption capacity and selectivity on recycling cationic dye (methylene blue, MB) from aqueous solution. The adsorption equilibrium of MB could be achieved approximately within 5 min when the initial concentration was 100 mg/L, and the maximum adsorption capacity was up to 565 mg/g. After 5 desorption-regeneration cycles, the removal rate of XG-Fe 3+ /AM for MB could still be as high as 95 % with slight decrement. Additionally, the effects of pH, contact time , temperature and initial dye concentration on the adsorption performance of MB were systematically examined. Furthermore, the adsorbent was characterized by FT-IR, BET and XPS analysis. In mixed anionic and cationic dyes, the adsorption selectivity of XG-Fe 3+ /AM on MB in the mixture of MB and methyl orange (MO) reached up to 99.69 %. Molecular dynamics simulation revealed that the trend of adsorption energy for dyes was in good agreement of the experimental order of adsorption capacities and molecular sizes among seven anionic and cationic dyes based on molecular matching effect and electrostatic interaction. Therefore, XG-Fe 3+ /AM is an eco-friendly, facile-synthesis and high-selectivity adsorbent, which remove cationic dyes in multi-component systems through electrostatic interaction and molecular matching effect.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Ying Zhang,Xueru Sheng,Na Li,Qingwei Ping,Peng Lu,Jian Zhang
Corn stalk and diatomite were cross-linked by N,N'-Methylenebisacrylamide (MBA) to obtain gel porous materials for methylene blue adsorption, which improved the multi-element pores effect. The process solved the difficult recovery problem of powder adsorbents as well. Results showed that the optimal preparation conditions of corn stalk/diatomite gel porous materials were: 1 mL of glutaraldehyde, 6 g of acrylic acid, 150 mg of MBA and 100 mg of potassium persulfate. The adsorption process conditions were optimized: At the pH = 8, 8 mg of gel porous material was adsorbed for 1 hour. Under the optimal conditions, the removal percentage was 93.65% and the adsorption capacity reached 288.43 mg/g. The characterization results indicated that the corn stalk was successfully combined with diatomite. Corn stalk/diatomite gel porous materials had a three-dimensional network structure with more active sites. The adsorption isotherms fit the Langmuir model. Furthermore, the adsorption kinetics fit the pseudo-second-order model. The adsorbent surface is uniform and the adsorption process is mostly monolayer adsorption. The adsorption process includes chemical and physical adsorption. The maximum saturated adsorption capacity was 657.89 mg/g. Corn stalk/diatomite gel porous materials maintained good adsorption performance after cyclic adsorption. The adsorbent prepared in this study has a good regeneration cycle and methylene blue removal capacity.
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RSC Advances
·
2017
·Vol. 7
·期 66
·41667-41674
·
IF 3.108
Shihan Yan,Hua Zhang,Zhongbo Yang,Mingjie Tang,Mingkun Zhang,Chunlei Du,Hong-Liang Cui,Dongshan Wei
Methylene blue (MB) as an important dye and medicine, has several different crystalline hydrates. These MB hydrates can transform from one to another at different temperatures or humidities. Determination of these hydrates is a big challenge for traditional spectroscopic technologies like infrared spectroscopy (IR) and Raman spectroscopy due to the component and structure similarities among these hydrates. We present a terahertz (THz) spectroscopy technology to differentiate three typical MB hydrates: pentahydrate, dihydrate and anhydrate. The pentahydrate exhibits prominent THz absorption features at 0.84 and 1.68 THz, and the dihydrate exhibits a broad and weak absorption peak at 0.89 THz, while the anhydrate has no obvious characteristic absorption peak at the measured spectral range of 0.2–2.0 THz. The dehydration kinetics of MB hydrates is investigated according to the variation of one of the main THz characteristic absorption peaks of MB pentahydrate with the heating time at different heating temperatures. A clear relation between the dehydration rate and the heating temperature can be fitted by an Arrhenius equation. The fitted activation energy of 64.5 kJ mol−1 is quite consistent with the enthalpy change due to the transformation of MB pentahydrate to MB anhydrate reported in a previous study.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 18
·2928-2933
·
IF 2.942
Xianjun Tan,Liujia Lu,Lingzhi Wang,Jinlong Zhang
Graphical A bimodal mesoporous Fe 3 O 4 @SiO 2 composite was fabricated through a facile self-assembly route. Unprecedentedly good tunability of the core size (180–1700 nm) and the shell thickness (20–75 nm) has been achieved. The composite exhibits excellent performance in organic pollutant removal through adsorption and photo-Fenton degradation. A facile self-assembly synthetic procedure was exploited to fabricate mesoporous-silica-capped Fe 3 O 4 mesoporous clusters, so-called bimodal mesoporous Fe 3 O 4 @SiO 2 composites. Structural characterization demonstrated that the core of the Fe 3 O 4 clusters is coated with a mesoporous silica shell of uniform size distribution. Moreover, unprecedentedly good tunability of the core size (180–1700 nm) and the shell thickness (20–75 nm) is achievable by changing the synthetic parameters. Application of the composite in the removal of the organic dye methylene blue (MB) from aqueous solution was examined. The composite exhibits excellent adsorption of methylene blue from aqueous solution (33.12 mg g –1 ) within 5 min and is easily regenerated by the photo-Fenton degradation reaction as a result of its high specific surface area, accessible pore channels, and good magnetic separation properties. This novel adsorbent promises extensive application in the practical removal of organic dyes.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 5
·891-899
·
IF 1.113
Wang Yixi,Zhang Chongyang,Zhao Linyan,Meng Guihua,Wu Jianning,Liu Zhiyong
A novel cellulose-based porous adsorbent with high adsorption capacity for methylene blue (MB) was prepared by free radical polymerization methods. The obtained polymer grafting rate and dye removal efficiency are as high as 338.64 % and 97.74 %, respectively, when the dosage of monomer is 4.5 g, the polymerization condition is 3 h at 70 °C. The cellulose-based adsorbent showed high mechanical properties and good flexibility. The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this material for methylene blue was 1734.816 mg g-1 at pH 9.0 at 313 K, which is higher than the values observed for other adsorbents. Scanning electron microscopy (SEM) showed that the cellulose-based adsorbent exhibits a typical well-defined porous and interconnected three-dimensional framework structure, which is benefits to dye adsorption. The adsorption kinetics (pseudo first-order, pseudo-second-order, and intraparticle diffusion models) was also studied, and the pseudo-second-order model fitted MB adsorption better than the pseudo-first-order and intraparticle diffusion models at different initial dye concentrations (500-3000 mg l
-1 ). The novel polyacrylic acid-grafted quaternized cellulose (PAA- g -QC) adsorbent is thus potentially useful for the treatment of dye-contaminated wastewater.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xi-Lin Wu,Yanpeng Shi,Shuxian Zhong,Hongjun Lin,Jian-Rong Chen
Herein, we have developed a facile and low-cost method for the synthesis of novel graphene based nanosorbents. Firstly, well-defined Fe 3 O 4 nanoparticles were decorated onto graphene sheets, and then a layer of mesoporous SiO 2 were deposited on the surface of the Fe 3 O 4 -graphene composites. The obtained Fe 3 O 4 -graphene@mesoporous SiO 2 nanocomposites (denoted as MG@m-SiO 2 ) were characterized by scanning electron microscopic (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The adsorptive property was investigated by using MG@m-SiO 2 as sorbents and Methylene Blue (MB), a common dye, as model of the organic pollutants. Adsorption kinetics, isotherms, thermodynamics as well as effects of pH and adsorbent dose on the adsorption were studied. The adsorption isotherms and kinetics are better described by Langmuir isotherm model and pseudo-second-order kinetic model, respectively. Thermodynamic studies suggest that the adsorption of MB onto the MG@m-SiO 2 is endothermic and spontaneous process. The results imply that the MG@m-SiO 2 can be served as a cost-effective adsorbent for the removal of organic pollutants from aqueous solutions.
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Journal of Experimental Nanoscience
·
2016
·
IF 0.832
L.Z. Pei,N. Lin,T. Wei,H.Y. Yu
Manganese vanadate nanobelts have been synthesised by a simple hydrothermal process using polymer polyvinyl pyrrolidone as the surfactant by adjusting the pH value. The X-ray diffraction, selected area electron diffraction and the high-resolution transmission electron microscopy (TEM) show that the manganese vanadate nanobelts are composed of a single crystalline monoclinic Mn2V2O7 phase. Scanning electron microscopy and TEM observations show that the thickness, width and length of the nanobelts are 20 nm, 350 nm–1 μm and several dozens to several hundreds of micrometres, respectively. The photocatalytic activities of the manganese vanadate nanobelts have been evaluated by the photocatalytic degradation of methylene blue (MB) in an aqueous solution as a model pollutant under the solar light irradiation. After 4 h of the irradiation by the solar light, the MB solution with the volume of 10 mL and the concentration of 10 mg·mL−1 can be totally degraded using 10 mg manganese vanadate nanobelts.
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