MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-9
·
IF 5.705
Gao Tian,Wang Junmin,Hao Lin,Yang Xiumin,Wang Chun,Wu Qiuhua,Wang Zhi
Magnetic knitting aromatic polymers (Fe 3 O 4 /KAPs) are introduced here as a new kind of sorbents. KAPs are hyper-cross-linked-polymers that were prepared via a Friedl-Crafts reaction from triphenylphosphine and benzene as building blocks. The Fe 3 O 4 /KAP composite was obtained by coprecipitation of KAP with magnetite nanoparticles. The resulting Fe 3 O 4 /KAP is shown to be a viable magnetic sorbent for various organic materials such as the phenylurea herbicides (PUHs), including metoxuron, monuron, chlortoluron, monolinuron and buturon, and also for various phthalates, polycyclic aromatic hydrocarbons and chlorophenols. The Fe 3 O 4 /KAP was characterized by means of Brunauer-Emmett-Teller surface area measurements, Fourier-transform infrared spectroscopy, thermogravimetry, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Following desorption with acetonitrile, the analytes were quantified by using HPLC with UV detection. The effects of adsorbent dosage, extraction time, sample pH, ionic strength, desorption solvent and desorption time were optimized for the PUHs. Under optimal conditions, response is linear from 0.5–1.0 up to 50 ng·mL −1 for the five PUHs. Lower limits of detection range between 0.05 and 0.30 ng·mL −1 . Other figures of merit include (a) high enrichment factors (60–297), (b) good recoveries (91.8–106.5%), and (c) relative standard deviations of <8.4%. The method was successfully applied to analysis of the PUHs in real samples (bottled mixed juice, milk and soymilk). The results indicate that such Fe 3 O 4 /KAPs have a wide application scope as an adsorbent for use in magnetic solid phase extraction.
A magnetic knitting aromatic polymer based nanocomposite (Fe 3 O 4 /KAP) was prepared by a one-pot method and explored as an absorbent for magnetic solid-phase extraction (MSPE) of phenylurea herbicides (PUHs) from bottled mixed juice, milk and soymilk samples before quantitation by HPLC with UV detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 26
·期 2
·1383-1397
·
IF 3.809
Liu Gongyan,Xiang Jun,Xia Qiongfen,Li Kaijun,Lan Tianxiang,Yu Ling
Abstract Common cotton gauze was endowed with both superhydrophobic and antibacterial properties by a dip-coating method that involved sequential deposition of positively charged chitosan (CS), negatively charged gallic acid modified silver nanoparticles (GA@AgNPs) and 1H,1H,2H,2H-perfluorodecanethiol (PFDT) with low surface energy on cotton fabrics. After such surface coating, the wettability of gauze surface was converted from superhydrophilic to superhydrophobic with a water contact angle (CA) of 158 ± 2.2° and sliding angle (SA) of 5.2 ± 1.8°, exhibiting water repellency, antifouling ability as well as bacterially antiadhesive activity. Moreover, such PFDT/GA@AgNPs/CS-coated cotton fabrics showed efficiently antibacterial activities against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), which was mainly attributed to the synergistic effect of contact-killing of CS and continuous release of Ag + . In addition, it was found that the outer PFDT deposition could act as a barrier to prevent leaching of the AgNPs during laundry, enhancing the antibacterial durability. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7483-7494
·
IF 3.917
Lu Zhou,Liu Jian,Dong Chaohong,Zhang Zheng,Wei Dongdong
Abstract A novel fluorinated pyridinium polysiloxane quaternary ammonium salt (ATPDMS-NF) was synthesized and used as an antibacterial and hydrophobic agent. The chemical structures were characterized by Fourier transform infrared spectra and 1 H nuclear magnetic resonance. The surface morphology of treated cotton fabrics was characterized by scanning electron microscopy and energy dispersive spectroscopy (EDS). The thermal stability was measured by thermogravimetric analysis. The Escherichia coli ( E. coli ) antibacterial rate was about 98.99, 99.49, 99.49% and the Staphylococcus aureus ( S. aureus ) antibacterial rate was about 99.00, 99.50, 99.50%. The inhibition zone was 1 mm and 3.5 mm against E. coli and S. aureus . In addition, the treated cotton fabrics showed excellent hydrophobic properties, and the water contact angle (WCA) increased to 122.82° compared with cotton fabrics without treatment whose WCA was 71.44°. As a result of the performed modifications, multifunctional fabrics with a considerably increased hydrophobicity, thermal stability and high antibacterial property were obtained. Graphic abstract Process of grafting ATPDMS-NF onto cotton fabric and performance display.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1839-1850
·
IF 1.947
He Lei,Zhang Yaqin,Zheng Yane,Jia Qingming,Shan Shaoyun,Dong Yanan
An effective catalyst of MIL-101(Fe)/TiO 2 composite was synthesized by solvothermal method. The resultant MIL-101(Fe)/TiO 2 was used for advanced oxidation degradation of tetracycline (TC) for the first time. The results indicated that the MIL-101(Fe)/TiO 2 showed higher TC degradation efficiency than pure MIL-101(Fe) or TiO 2 with the persulfate. Using 1 g L −1 MIL-101(Fe)/TiO 2 and persulfate at pH 7, 90.15% degradation rate was achieved under xenon lamp irradiation in 5 min for 20 mg L −1 TC. TiO 2 introduced in the composite played an important role in the degradation process, in which TiO 2 had a synergetic effect with Fe 3+ to generate Fe 2+ , Ti 3+ and radicals. Fe 2+ reacted with persulfate to produce Fe 3+ and a number of · OH to degrade TC. This reaction process was so fast that MIL-101(Fe)/TiO 2 with persulfate could degrade TC fairly rapidly. A novel TiO 2 -based metal–organic frameworks (MOFs) composite was more efficient for degrading pharmaceutical wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 10
·2161-2171
·
IF 2.413
Lai Xiaoxia,Yan Shang,Ye Nengsheng,Xiang Yuhong
Acetylcholinesterase (AChE) can catalyze the hydrolysis of acetylthiocholine iodide (S-ACh-I) to produce thiocholine, which can crosslink with gold nanoparticles (AuNPs) by Au-S covalent bond and trigger AuNPs aggregation. The catalytic ability of aggregation of AuNPs is less than dispersed AuNPs. In the presence of carbaryl, which can inhibit the catalysis activity of AChE, therefore, the production amounts of thiocholine and aggregation degree were decreased. In the Fehling reaction, low aggregation degree AuNPs was used to catalyze the reduction of Cu 2+ by glucose to form large size Cu 2 O particle. Large Cu 2 O particle has high resonance scattering signal intensities, which is negative correlated with carbaryl concentration. The developed assay was applied to detect the carbaryl in aqueous solutions, and two excellent linear relationships were obtained in the range of 0.03–3.31 nM and 26.50–265.05 nM. The limit of detection (LOD) of carbaryl was down to 17.49 pM. The proposed method was successfully used to determine the concentration of spiked carbaryl in the apple matrix, and satisfactory recovery and repeatability were obtained.
✓ 已验证
产品关联
DOI
高影响因子
BIOMEDICAL MICRODEVICES
·
2019
·Vol. 21
·期 1
·1-13
·
IF 2.327
Shen Yiren,Du Kun,Zou Lili,Zhou Xiaoming,Lv Rong,Gao Dayong,Qiu Bensheng,Ding Weiping
Freeze-drying is a promising approach for the long-term storage of erythrocytes at room temperature. Studies have shown that trehalose loaded into erythrocytes plays an important role in protecting erythrocytes against freeze-drying damage. Due to the impermeability of the erythrocyte membrane to trehalose, many methods have been developed to load trehalose into erythrocytes. However, these methods usually require multistep manual manipulation and long processing time; the adopted protocols are also diverse and not standardized. Thus, we develop an osmotically-based trehalose-loading microdevice (TLM) to rapidly, continuously, and automatically produce erythrocytes with loaded trehalose. In the TLM, trehalose is loaded through the erythrocyte membrane pores induced by hypotonic shock; then, the trehalose-loaded erythrocytes are rinsed to remove hemoglobin molecules and cell fragments, and the extracellular solution is restored to the isotonic state by integrating a rinsing-recovering design. First, the mixing function and the rinsing-recovering function were confirmed using a fluorescent solution. Then, the performance of the TLM was evaluated under various operating conditions with respect to the loading efficiency of trehalose, the hemolysis rate of erythrocytes ( ϕ ), the recovery rate of hemoglobin in erythrocytes ( φ ), and the separation efficiency of the TLM. Finally, the preliminary study of the freeze-drying of erythrocytes with loaded trehalose was accomplished using the TLM. The results showed that under the designated operating conditions, the loading efficiency for human erythrocytes reached ~21 mM in ~2 min with a ϕ value of ~17% and a φ value of ~74%. This study provides insights into the design of the on-chip loading of trehalose into erythrocytes and promotes the automation of life science studies on biochips.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Earth Science
·
2019
·Vol. 30
·期 4
·861-869
·
IF 1.784
Zhang Caixiang,Liao Xiaoping,Lü You,Nan Chao
The ligand-stabilized soluble Mn(III) recognized as active intermediate can potentially mediate the attenuation of contaminants. In this study, the abiotic degradation behaviors of methyl parathion in the ligand stabilized Mn(III)-sulfite system were investigated. The results showed that the yield of soluble Mn(III) produced from the redox reaction of MnO 2 and oxalic acid was dependent linearly on the dosage of MnO 2 and caused the decomposition of methyl parathion up to 50.1% in Mn(III)-sulfite system after 30 minutes. The fitted pseudo-first-order reaction constants of methyl parathion degradation increased with the increasing of the amount of produced Mn(III) but was not effected linearly by the addition of sulfite. Other ligands, including pyrophosphate and oxalic acid, acted as effective complexing agents to stabilize soluble Mn(III), and exhibited competitive effect on methyl parathion degradation with sulfite. The formation of Mn(III)-sulfite complexes is the critical step in the system to produce abundant reactive oxygen species identified as SO 3 • - to facilitate methyl parathion degradation. The hydrolysis and oxidation of methyl parathion were acknowledged as two primary transformation mechanisms in Mn(III)-sulfite system. These findings indicate that naturally ligands-stabilized soluble Mn(III) can be generated and could oxidatively decompose organophosphate pesticides such as methyl parathion.
✓ 已验证
产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 82
·期 3
·695-704
·
IF 1.401
Xue Jiaying,Zhang Dong,Wu Xiangwei,Pan Dandan,Hua Rimao
A new in-tube pretreatment method based on ultrasound assisted dispersive solid–liquid microextraction using self-assembly and solidification of an alkanol-based floating organic droplet was developed for the determination of eight pyrethroid insecticides in chrysanthemum by gas chromatography with electron capture detection. This method fully utilized the restricted access property of a 1-decanol/acetonitrile mixture for effective extraction of the analytes from chrysanthemum under ultrasonication, and the self-assembly and coacervation process of 1-decanol by adding water. The 1-decanol phase aggregated and floated on the surface, solidified in an ice bath, and thus was easily collected. For the first time, extraction, separation and preconcentration were combined in a tube, not requiring stepwise preparation for a solid matrix. The recoveries ranged from 75 to 104% with the relative standard deviations of < 8%. The limits of quantification were in the range of 0.15–1.5 µg kg − 1 up to 52-fold compared with the conventional QuEChERS-based, SPE, and solid–liquid dispersive microextraction methods. The results demonstrated that the proposed method was time-saving, sensitive, and environmentally friendly for pyrethroids analysis in chrysanthemum.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-8
·
IF 5.705
Cui Jingcheng,Chen Shichao,Ma Xicheng,Shao Hua,Zhan Jinhua
This work describes the integration of solid-phase microextraction (SPME) and surface-enhanced Raman spectroscopy (SERS) by codeposition of a hybrid consisting of reduced graphene oxide and silver on silver-copper alloy fibers. The morphology and structure of the coating were characterized by a variety of microscopic and spectroscopic techniques that confirmed the hybrid structure of the material. A galvanic-displacement-induced process is assumed to be involved during the codeposition of the hybrid coating on the alloy. In this process, Ag(I) is reduced to Ag(0) by Cu(0), and the presence of conjugated domains in GO facilitates the long-range transfer of electrons from Cu to Ag+. Simultaneously, GO accepts electrons and is converted into RGO. The hybrid coating exhibits a high SERS enhancement factor and good spatial uniformity. The needle-like coated alloy fibers are shown to be a viable tool for non-destructive sampling and SERS-based determination of trace levels of the antibiotics sulfadiazine and sulfamethoxazole in a spiked tissue mimic. The SERS peaks at 1149 cm −1 for sulfadiazine and 1144 cm −1 for sulfamethoxazole are selected as the reference peaks in the quantitative analysis. The linear range is from 0.01 to 100 μg·cm −3 . The detection limits are 1.9 ng·cm −3 for sulfadiazine and 4.4 ng·cm −3 for sulfamethoxazole.
Schematic presentation of I: Galvanic-displacement-induced reduction of graphene oxide (brown films) and Ag + (purple dots) on silver-copper alloy; II: Codeposition of reduced-graphene-oxide (grey films)/Ag (blue stars) on alloy fiber; III: Non-destructive SPME of antibiotics from spiked tissue mimic; IV: SERS detection using Raman spectroscope.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 19
·18246-18258
·
IF 2.195
Yu Zongxue,Feng XiaoFang,Min Xia,Li XiuHui,Shao LiangYan,Zeng HaoJie
In the study, the reduced graphene oxide/graphitic Bi 12 O 17 Cl 2 –TiO 2 heterojunctions sheet membrane(RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 ) was fabricated by the dopamine modification and assembling the RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 composites on the surface of commercial CA(cellulose acetate) membrane to degrade methylene blue (MB) and p-chlorophenol (4-CP) to harmless products. These membrane materials were comprehensively characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectra (DRS). The results showed that RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 nanofiber membrane exhibited extremely high degradation performance with a good distribution of RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 on the CA nanofiber membrane surface. Besides, the complete photodegradation of 100 mL MB (15 mg L −1 ) solution and 100 mL 4-CP (15 mg L −1 ) solution with artificial visible-light was achieved after 100 min and 160 min, respectively. The RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 -CA composite membrane revealed the ability of continuous and simultaneous flow-through separation of oil/water emulsion and degradation of soluble organic dye under visible-light irradiation in a short time. Moreover, the nanofiber membranes exhibited excellent stability and reusability for MB-containing oil–water mixed emulsion separation has great potential to be applied in industrial application.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 92
·期 3
·652-661
·
IF 1.986
Li Xiaohua,Yang Zichun,Li Kunfeng,Zhao Shuang,Fei Zhifang,Zhang Zhen
In this paper, transparent flexible hydrophobic silica aerogels were prepared by replacing the traditional alcohol solvent with water, using methyltriethoxysilane (MTES) and cetyltrimethylammonium bromide (CTAB), via acid-base two steps method and CO 2 supercritical drying. The role of surfactant CTAB in the gel–sol process was revealed, and the effect of CTAB concentration on the gel structure was analyzed. With the concentration increasing, the skeleton structure of the gel gradually changed from coarse graininess to continuous fiber. The obtained aerogels showed good elastic properties. With the increasing of density, the elastic modulus of aerogels gradually increased, so that the length could be restored to 63% of the original length after 50% compression strain. Aerogels also had low thermal conductivity and good thermal stability. The thermal conductivity at room temperature was only 0.0215 W/(m·K) and the initial decomposition temperature was up to 511 °C. For the aerogel with thickness of 11.8 mm and density of 60 mg/cm 3 , it showed good sound absorption and sound insulation properties. When the sound frequency was 2000 Hz, the sound absorption coefficient was 0.91, and the sound transmission loss between 500 and 1600 Hz was 13–21 dB. This work provides a facile approach to fabricate lightweight and flexible silica aerogels for thermal and acoustic insulation applications.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 27
·期 11
·1144-1154
·
IF 1.758
Zhou Jinsheng,Lin Yanming,Ye Lin,Wang Ling,Zhou Li,Hu Huiyuan,Zhang Qilong,Yang Hui,Luo Zhongkuan
To solve the biofouling problem of polyvinyl alcohol (PVA) hydrogel as the artificial cornea, glycidyl methacrylate (GMA) and 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC) were grafted on the surface of PVA hydrogel via a new method of photoinduced electron transfer—reversible addition fragmentation chain transfer (PET-RAFT) polymerization and ring-open reaction. Both attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscope (SEM), and thermogravimetric analysis (TGA) confirmed that GMA and HACC were successfully grafted on the surface of PVA hydrogel. A series of experiments to test the hydrophilicity of PVA hydrogel showed that it became hydrophobic due to the introduction of hydrophobic groups after grafting with GMA and HACC. In addition, cytotoxicity in vitro of PVA-g-p(GMA-HACC) hydrogel could be considered as not cytotoxicity according to ISO 10993-5: 2009. The anti-fouling property of hydrogel decreased after grafting with GMA due to the hydrophobic surface, while increased after grafting with HACC due to the steric repulsion of p(GMA-HACC) polymer brush. It’s no doubt that PET-RAFT was a feasible and reliable surface modification method which could be used in many biomolecules due to the excellent advantages.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）