CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Honghe Song,Haiyan Zhu,Rui Wang,Shumei Wen,Chenghu Yan,Wei Cong
We propose a facile method for preparing polyvinylidene fluoride (PVDF) membranes with exceptional selectivity for rare earth ions and stability by UV irradiation technology using 3,3′, 4,4′-benzophenone tetracarboxylic acid (BTA) as the grafted materials. The grafting of BTA onto the membrane surface was confirmed through Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The selection factors of PVDF- g -BTA membranes for Dy 3+ over Na + , K + , Ca 2+ , and Mg 2+ were 140.57, 114.16, 74.23, and 86.25, respectively. The adsorption capacity of the PVDF- g -BTA membranes remained above 80 % following five adsorption–desorption cycles, and the contact angle remained stable throughout the 30 days of immersion.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
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2021
·
IF 3.575
Zhimao Mai,Lin Wang,Qiqi Li,Yingting Sun,Si Zhang
The bacterium Gordonia sp. SCSIO19801, which could effectively utilize phenanthrene as the sole carbon source, was isolated from the seawater of the South China Sea. Its biodegradation characteristics, whole genome sequence, and biodegradation pathway were investigated. The phenanthrene biodegradation process of Gordonia sp. SCSIO19801 was estimated to be a first-order kinetic model with a k value of 0.26/day. Based on the identification of metabolites, utilization of probable intermediates, and genomics analysis of related genes, the degradation of phenanthrene by Gordonia sp. SCSIO19801 was proposed to occur via the salicylate metabolic pathway. This is the first report of a phenanthrene degradation pathway in Gordonia species. In addition, the Gordonia sp. SCSIO19801 could use other aromatic compounds as the sole source of carbon and energy. These characteristics indicate that Gordonia sp. SCSIO19801 can be utilized for developing effective methods for the biodegradation of petroleum hydrocarbons in marine environments.
研究领域:
微生物学
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环境科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-10
·
IF 5.705
Ge Yu,Camarada María Belén,Xu Lanjiao,Qu Mingren,Liang Huan,Zhao Erlong,Li Mingfang,Wen Yangping
A nanocomposite was prepared from graphene-like two-dimensional black phosphorene (BP, an allotrope of phosphorus) and nafion (Nf) treated with isopropanol (IP). A glassy carbon electrode (GCE) modified with this nanocomposite was found to be a viable sensor for voltammetric determination of clenbuterol (CLB). Unlike previously reported pure BP, the BP nanocomposite was stable towards water and oxygen. Its morphology, structure, electrochemically active surface area and electrochemical stability were investigated. The BP-Nf (IP) modified GCE displayed good electrochemical stability and electrocatalytic capacity with a low working potential of 0.94 V (vs. SCE), excellent peak current response for CLB in a linear concentration range of 0.06–24 μM with a detection limit of 3.7 nM (3σ/m) and a sensitivity of 0.14 μA·μM −1 ·cm −2 under optimal conditions. A sensing mechanism for the electro-oxidation of CLB was suggested and verified by density functional theory calculations under imitation of aqueous solution conditions. The sensor was successfully applied to the determination of CLB in bovine meat and bovine serum samples.
Highly-stable black phosphorene (BP) nanocomposite based on Nafion (Nf) was used to modify a glassy carbon electrode (GCE). It is shonw to be a viable electrochemical platform for sensitive voltammetric determination of trace clenbuterol (CLB) in bovine beef and bovine serum.
研究领域:
分析化学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 5
·934-939
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IF 1.063
Li Ruyue,Wu Mingwei,Pan Biwei,Li Meng,Huang Jun
A 1,10-phenanthroline based polymer named PPPhen( i.e. , polymer from pyrene 1,10-phenanthrolin) was prepared by the Friedel-Crafts reaction of 1,10-phenanthroline and pyrene cross-linked with dimethoxymethane. The related Pd catalyst Pd@PPPhen was prepared by supporting Pd nanoparticles(NPs) on the PPPhen material. PPPhen and Pd@PPPhen were characterized by means of scanning electron microscopy(SEM), transmission electron microscopy, N 2 adsorption-desorption, Fourier-transform infrared and X-ray photoelectron spectroscopy analyses. The results showed that PPPhen polymer was highly porous and that the phenanthroline group can enhance the stability of the Pd nanoparticles. Pd@PPPhen also exhibited good catalytic activity in the aerobic oxidation of alcohols to aldehydes and ketones, and Pd@PPPhen was recyclable with durable activity and retentive structures.
研究领域:
化学
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催化材料
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DOI
高影响因子
RSC Advances
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2023
·Vol. 13
·期 17
·11782-11793
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IF 3.9
Xiaoxiao Gu,Lixian Xu,Haoyang Yuan,Cailing Li,Juan Zhao,Shuang Li,Dinghua Yu
Anti-bacterial photodynamic therapy is the most promising treatment protocol for bacterial infection, but low accumulation of photosensitizers has seriously hindered their development in clinical application. Here, with inherent outstanding affinity to bacterial cell envelope, sophorolipid produced from Candida bombicola has been conjugated to toluidine blue (SL-TB) through amidation reaction. The structure of SL-TB conjugates was identified by 1H-NMR, FT-IR and ESI-HRMS. The interfacial assembly and photophysical properties of SL-TB conjugates have been disclosed through surface tension, micro-polarity, electronic and fluorescence spectra. After light irradiation, the log10 (reduced CFU) of free toluidine blue to P. aeruginosa and S. aureus were 4.5 and 7.9, respectively. In contrast, SL-TB conjugates showed a higher bactericidal activity, with a reduction of 6.3 and 9.7 log10 units of CFU against P. aeruginosa and S. aureus, respectively. The fluorescence quantitative results showed that SL-TB could accumulate 2850 nmol/1011 cells and 4360 nmol/1011 cells by P. aeruginosa and S. aureus, which was much higher than the accumulation of 462 nmol/1011 cells and 827 nmol/1011 cells of free toluidine blue. Through the cooperation of triple factors, including sophorose affinity to bacterial cells, hydrophobic association with plasma membrane, and electrostatic attraction, higher SL-TB accumulation was acquired, which has enhanced antibacterial photodynamic efficiencies.
研究领域:
微生物学
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药理学
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产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Wei Zhang,Heng Li,Siqiang Xiao,Jianfei Wu,Chuanhu Wang,Xiaobin Liu,Qingbiao Li,Yanmei Zheng
Controllable delivery of persulfate (PS) and the enhancement of oxidative availability of pollutants in in-situ oxidative remediation of low-permeability polycyclic aromatic hydrocarbons (PAHs) contaminated soil are crucial. To tackle the above challenges, the coupling of Tween 80 solubilization enhanced oxidation of phenanthrene (PHE) in low-permeability soil under electrokinetic remediation (EKR) was proposed. Firstly, batch degradation experiments showed that the addition of Tween 80 significantly inhibited the degradation of PHE in soil under thermally activated PS, as the dosage of Tween 80 increased from 0 % to 1 % with the corresponding removal rate declining from 99.19 % to 40.90 %. Accordingly, in-situ electrokinetic delivery of Tween 80 and PS was regulated in further EKR, intending to reduce unproductive consumption. PS was more uniformly delivered to the whole remediation regions from the cathode chamber by electromigration , while Tween 80 was transported into the soil from the anode chamber by electroosmosis , which made Tween 80 solubilization and PS oxidation achieve synergistic effect . And the total removal rate of PHE reached 64.90 % under this strategy, which had increased by 415.90 % and 8.76 %− 130.14 % compared with only EKR or EKR coupling single enhanced technology , respectively. After further thermal activation of transported PS at 50 ℃ by electrical resistance heating, the total removal rate of PHE increased to 71.58 %. EPR spectrum indicated that SO 4 . - and OH . were responsible for the degradation of PHE.
研究领域:
环境科学
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化学工程
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土壤修复
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DOI
高影响因子
FUEL
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2024
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IF 6.7
Yuqi Su,Pengcheng Sun,Junshuai Chen,Maogang He,Ying Zhang
The transport properties including thermal diffusivity and Fick diffusion coefficient are of great significance to the optimization of heat and mass transfer processes in the combustion of gasoline. In this work, the thermal diffusivities and Fick diffusion coefficients of ethanol + isooctane binary mixtures were measured by dynamic light scattering method at mole fraction of ethanol x 1 = 0.1, 0.3, 0.5, 0.7 and 0.9, and over the temperature range from 323.15 K to 523.15 K along the isobaric lines including 2.5 MPa, 5 MPa, 7.5 MPa and 10 MPa. The variation of thermal diffusivity and Fick diffusion coefficient with the temperature, pressure and composition was analyzed to guide the optimization of combustion process. Four classic estimation models were used for the calculation of the thermal diffusivities of the binary mixtures of ethanol + isooctane. The Scheffé model has the best calculation performance with the average absolute relative deviations (AARD) of 2.09 %. The UNIDIF model was used to estimate the Fick diffusion coefficients of ethanol + isooctane with the AARD of 4.75 %.
研究领域:
化学工程
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燃烧科学
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热力学
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DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 24
·4912-4918
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IF 1.915
Pengfei Pang,Fuqing Yan,Haizhen Li,Haiyan Li,Yanli Zhang,Hongbin Wang,Zhan Wu,Wenrong Yang
A novel electrochemical sensor for highly sensitive and selective detection of dopamine (DA) was developed based on a graphene quantum dots (GQDs) and Nafion composite modified glassy carbon electrode (GCE). GQDs were synthesized by a hydrothermal approach for cutting graphene sheets into GQDs and characterized by TEM, UV-vis, photoluminescence, and FT-IR spectra. The GQDs had carboxyl groups with a negative charge, which not only provided good stability, but also enabled interaction with amine functional groups in DA through electrostatic interaction to enhance the specificity of DA. The interaction and electron communication between GQDs and DA can be further strengthened via π–π stacking force. Nafion was used as an anchoring agent to increase the robustness of GQDs on the electrode surface and sensor stability and reproducibility. The GQDs–Nafion composite exhibits a good linear range of 5 nM to 100 μM and a limit of detection as low as 0.45 nM in the detection of DA. The proposed electrochemical sensor also displays good selectivity and high stability and could be used for the determination of DA in real samples with satisfactory results. The present study provides a powerful avenue for the design of an ultrasensitive detection method for clinical application.
研究领域:
生物医学工程
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分析化学
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
·
IF 3.412
Shengfeng Peng,Ziling Li,Liqiang Zou,Wei Liu,Chengmei Liu,David Julian McClements
There is great interest in developing colloidal delivery systems to enhance the water solubility and oral bioavailability of curcumin, which is a hydrophobic nutraceutical claimed to have several health benefits. In this study, a natural emulsifier was used to form sophorolipid-coated curcumin nanoparticles. The curcumin was loaded into sophorolipid micelles using a pH-driven mechanism based on the decrease in curcumin solubility at lower pH values. The sophorolipid-coated curcumin nanoparticles formed using this mechanism were relatively small (61 nm) and negatively charged (−41 mV). The nanoparticles also had a relatively high encapsulation efficiency (82%) and loading capacity (14%) for curcumin, which was present in an amorphous state. Both in vitro and in vivo studies showed that the curcumin nanoparticles had an appreciably higher bioavailability than that of free curcumin crystals (2.7–3.6-fold), which was mainly attributed to their higher bioaccessibility. These results may facilitate the development of natural colloidal systems that enhance the oral bioavailability and bioactivity of curcumin in food, dietary supplements, and pharmaceutical products.
研究领域:
食品科学
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药剂学
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营养学
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产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Dongyue Liu,Pengfei Ji,Tianlong Zhang,Jipeng Lv,Yihua Cui
A bi-DOPO type of prepolymer for flame retardancy epoxy resins with intrinsically flame-retardant was successfully synthesized by reacting of 6,6′-((6,6′-dihydroxy-[1,1′-biphenyl]-3,3′-diyl) bis (propane-3,1-diyl)) bis(dibenzo[c,e][1,2] oxaphosphinine 6-oxide) (DOBP) with bisphenol A. The characterization of the cured epoxy resins, such as cone calorimeter, TGA/infrared, Raman and SEM indicated that DOBP with double 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) structure endowed the epoxy resins with excellent flame retardancy, including limiting oxygen index of 40.0%, V-0 rating in UL-94, remarkable smoke suppression and flame inhibition. The quenching effect of gaseous phase and charring effect of condensed phase of phosphaphenanthrene groups in prepolymer together contributed to the improvement on the flame retardant performance of the epoxy resins. In addition, due to the rigid structure of DOBP molecules, the cured d -FREP possessed high glass transition temperature of up to 192.9°C, and the tensile modulus of which was increased about 55% compared with the neat epoxy resins.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xin Dai,Yanfei Xin,Yuanzhen Chen,Qiang Tan,Yongning Liu
Water-splitting by electrolysis is one of the most important approaches to produce hydrogen as renewable clean energy with superior advantages of high-purity and good operability. But the key issue limiting the large-scale application is that it demands a much higher overpotential than the theoretical oxygen evolution potential. Herein, we report an efficient electrochemical catalyst of NiFeBO synthesized via a facile one-step process, presenting remarkable catalytic activity and long-term stability. In this work, we discussed the effects of the doping of Fe and the insertion of BO 2 − in the as-synthesized NiFeBO. According to the experimental results, NiFeBO shows a very low overpotential of 256 mV and a Tafel slope of 53 mV dec −1 with remarkable stability over 60 h of chronopotentiometry test. The inserted anion of BO 2 − can adsorb OH − in electrolyte around the catalyst to increase the concentration of OH − around the active sites, thereby improving the effectivity of oxygen evolution reaction. In addition, diffused micro-crystalline with different lattice formed during the oxidation of the as-synthesized catalyst, providing more active sites than the pristine amorphous.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2013
·
IF 2.672
Yangyang Gao,Huan Wang,Liping Guo
In this work, a glassy carbon electrode (GCE) modified with large mesoporous carbon and Nafion composites (LMC/Nafion) was constructed and used for simultaneous determination of theophylline (TP) and caffeine (CF). The electrochemical behaviors of TP and CF on the LMC/Nafion/GCE were carefully investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results show that the DPV peaks of the two analytes can be distinguished at the modified electrode with peak-to-peak separation about 150 mV, which means that LMC/Nafion/GCE is suitable for simultaneous determination of TP and CF. Under the optimized condition, the detection limits of TP and CF were 0.37 and 0.47 μM ( S / N = 3) with linear ranges of 0.8–180.0 μM and 1.3–230.0 μM, respectively. The proposed method was successfully applied to the simultaneous determination of TP and CF in human blood serum and beverages with reliable recovery.
研究领域:
分析化学
·
电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）