CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 8
·970-978
·
IF 2.016
Meng Xiang-Li,Yu Gen-Hua,Ma Jian
Novel poly(aryl ether sulfone ketone)s (PAESK) were synthesized from bisphenol A (BPA), 9,9′-bis(4-hydroxyphenyl) fluorene (BHPF), 4,4′-dichlorodiphenylsulfone (DCS) and 4,4′-difluorobenzophenone (DFB) via nucleophilic substitution polymerization, which were subsequently used to fabricate ultrafiltration membrane by phase-inversion method for high temperature condensed water treatment. The obtained high molecular weight co-polymers with fluorene group with good solubility and good thermal stability, can be easily cast into flexible, white and non-transparent flat films. The influence of molar ratio of BPA and BHPF on the properties of the prepared co-polymers and membranes was investigated in detail. SEM study of the morphology of the membranes indicated that the prepared membranes possessed homogeneous pores on the top surface and were sponge-like or finger-like in cross-section. Pure water flux of the membranes increased from 71.87 L·m −2 ·h −1 to 247.65 L·m −2 ·h −1 , while the retention of BSA decreased slightly, and the water contact angle decreased from 82.1° to 55.6° with the PVP concentration from 0 wt% to 10 wt%. With increasing concentration of PVP, the mechanical properties of membranes decreased, while the thermal stability increased. The permeate flux measurement showed that the PAESK membrane had the potential for high temperature condensed water treatment.
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International Journal of Minerals Metallurgy and Materials
·
2018
·Vol. 25
·期 5
·481-488
·
IF 1.261
Li Zhi-li,Rao Feng,Song Shao-xian,Li Yan-mei,Liu Wen-biao
In saline water flotation, the salinity can cause a distinguishable slime coating of clay minerals on chalcopyrite particles through its effect on their electrical double layers in aqueous solutions. In this work, kaolinite was used as a representative clay mineral for studying slime coating during chalcopyrite flotation. The flotation of chalcopyrite in the presence and absence of kaolinite in tap water, seawater, and gypsum-saturated water and the stability of chalcopyrite and kaolinite particles in slurries are presented. Zeta-potential distributions and scanning electron microscopy images were used to characterize and explain the different slime coating degrees and the different flotation performances. Kaolinite particles induced slime coating on chalcopyrite surfaces and reduced chalcopyrite floatability to the greatest extent when the pH value was in the alkaline range. At 0.24wt% of kaolinite, the chalcopyrite floatability was depressed by more than 10% at alkaline pH levels in tap water. Salinity in seawater and gypsum-saturated water compressed the electrical double layers and resulted in extensive slime coating.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 18
·4387-4395
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IF 3.307
Qiu Xiuzhen,Xu Xian-Yan,Chen Xuncai,Wu Yiyong,Guo Huishi
A novel molecularly imprinted quartz crystal microbalance (QCM) sensor was successfully prepared for selective determination of sialic acid (SA) in human urine samples. To obtain the QCM sensor, we first modified the gold surface of the QCM chip by self-assembling of allylmercaptane to introduce polymerizable double bonds on the chip surface. Then, SA molecularly imprinted polymer (MIP) nanofilm was attached to the modified QCM chip surface. For comparison, we have also characterized the nonmodified and improved surfaces of the QCM sensor by using atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. We then tested the selectivity and detection limit of the imprinted QCM sensor via a series of adsorption experiments. The results show a linear response in the range of 0.025–0.50 μmol L −1 for sialic acid. Moreover, the limit of detection (LOD) of the prepared imprinted QCM sensor was found to be 1.0 nmol L −1 for sialic acid, and high recovery values range from 87.6 to 108.5% with RSD < 8.7 ( n = 5) for the spiked urine sample obtained. Overall, this work presents how a novel QCM sensor was developed and used to detect sialic acid in human urine samples.
Specific recognition of sialic acid by the MIP-QCM sensor system
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2018
·Vol. 34
·期 3
·363-368
·
IF 1.248
Ma Lian,Xu Bin,Liu Leijing,Tian Wenjing
A label-free fluorescent aptasensor for specific and ultrasensitive monitoring ochratoxin A(OTA) was developed using the specific aptamer of OTA(OSA) as recognition element, an aggregation-induced emission(AIE) molecule(a 9,10-distyrylanthracene with two ammonium groups, DSAI) as a fluorescent probe, and graphene oxide(GO) as a quencher. In the absence of OTA, the AIE probe DSAI and OSA complex(DSAI/OSA) is adsorbed on the GO surface, and the fluorescence of DSAI will be quenched efficiently via the fluorescence resonance energy transfer(FRET) from DSAI to GO. Upon the OTA addition, a more stable complex(OSA-OTA) is formed and released from GO. Meanwhile, DSAI and OSA-OTA can form a new complex(DSAI/OSA-OTA), then the fluorescent signal of DSAI recovers gradually. Therefore, by introducing GO and DSAI, the fluorescence signal of DSAI can be easily turned from “off” to “on” after the addition of OTA, and the ultrasensitive detection of OTA by monitoring the change of the fluorescence signal of DSAI can be readily realized. The detection limit of the assay can reach 0.324 nmol/L with a linear detection range of 10—200 nmol/L. And the aptasensor exhibits high selectivity for OTA against other analogues. Moreover, it has been successfully applied for the detection of OTA in red wine samples.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 8
·1-9
·
IF 5.705
Chen Ya-Shun,Ding Jun,He Xiao-Mei,Xu Jing,Feng Yu-Qi
Two-dimensional tellurium nanosheets were prepared by a hydrothermal method and characterized by scanning electron microscopy, powder X-ray diffractometry, and UV-vis spectroscopy. The nanosheets were explored as a novel matrix for desorption/ionization of small molecules including nucleobases, fatty acids and amino acids by matrix assisted laser desorption/ionization time-of-flight mass spectrometry. The results show that the tellurium nanosheets have good UV light absorption, cause low matrix ion interference in the low-molecule-mass region, and have high desorption/ionization efficiency in the negative ion mode. Hence, they are a viable matrix for negative ion desorption/ionization in MALDI-TOF MS of small molecules. In order to investigate the desorption/ionization mechanisms, benzylpyridinium salt and bisphenol A were adopted as probes. The results show that both of the electronic transitions mechanism and laser-induced thermal mechanism play important roles in desorption/ionization process.
Two-dimensional tellurium (Te) nanosheet was synthesized by a hydrothermal method and explored as a novel matrix for desorption/ionization of small molecules by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS).
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-7
·
IF 5.705
Liu Qingju,Han Ping,Gong Wenwen,Wang Hui,Feng Xiaoyuan
A method is described for the determination of the pesticide chlorothalonil (CLT). It is based on the finding that citrate-capped gold nanoparticles (AuNPs) undergo aggregation on exposure to chlorothalonil. This is accompanied by a visually detectable color change from wine red to blue. The effect is due to the interaction of the cyano group of chlorothalonil with gold nanoparticles. The assay may also be performed by using a spectrometer. The ratio of absorbances at 700 nm and 520 nm (A 700 /A 520 ) linearly drops in the 5 to 100 ng·mL −1 CLT concentration range, with a 3.6 ng·mL −1 detection limit. This is below the Chinese guideline value for cucumber. The method is rather simple and does not require any modification of the AuNPs or the utilization of antibody. It was successfully applied to the determination of CLT in (spiked) cucumber samples. Recoveries ranged from 80.4 to 97.4%, and the analytical results compared well with those obtained by HPLC.
Schematic of the assay. The strong interaction of the cyano group of acetamiprid with gold nanoparticles (AuNPs) via Au-N bond induces the aggregation of gold nanoparticles, and this is accompanied by a color change from red to purple.
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Environmental Earth Sciences
·
2018
·Vol. 77
·期 12
·1-10
·
IF 1.435
Wang Jing,Wen Xin,Yang Fan,Cao Zhanfang,Wang Shuai,Zhong Hong
A novel two-dimensional carbon material using phytic acid-functionalized graphene oxide was successfully synthesized by a simple hydrothermal method. Properties of the material were characterized by SEM, FT-IR, FITR-Rama and BET. Some factors like contact time, pH, and temperature were studied to investigate the adsorption characteristics on Cu(II) ions of the material. Experiment results showed that the material can reach equilibrium adsorption in 20 min and get maximum adsorption capacity (316.586 mg g) under the condition of pH 4.0, 304 K. The adsorption of Cu(II) ions was an exothermic and spontaneous process, and could be better simulated by the pseudo-second-order kinetics and Freundlich isotherm model.
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Nature Communications
·
2018
·Vol. 9
·期 1
·1-11
·
IF 12.353
Mo Jianbin,Xie Qingyun,Wei Wei,Zhao Jing
The increasing number of biological applications for black phosphorus (BP) nanomaterials has precipitated considerable concern about their interactions with physiological systems. Here we demonstrate the adsorption of plasma protein onto BP nanomaterials and the subsequent immune perturbation effect on macrophages. Using liquid chromatography tandem mass spectrometry, 75.8% of the proteins bound to BP quantum dots were immune relevant proteins, while that percentage for BP nanosheet–corona complexes is 69.9%. In particular, the protein corona dramatically reshapes BP nanomaterial–corona complexes, influenced cellular uptake, activated the NF-κB pathway and even increased cytokine secretion by 2–4-fold. BP nanomaterials induce immunotoxicity and immune perturbation in macrophages in the presence of a plasma corona. These findings offer important insights into the development of safe and effective BP nanomaterial-based therapies.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 5
·1024-1031
·
IF 1.353
Lei Wenwen,Sun Yufa,Huang Bin,Zhou Xiangdong
The polyurethane modified organic silicone (PU-SA) was successfully synthesized via step-by-step polymerization with isophorone diisocyanate (IPDI) and polypropylene glycol (PPG) used as monomers, dibutyltindilaurate (DBTDL) as the catalyst, trimethylolpropane (TMP) and N-methyldiethanolamine (MDEA) as the chain extender, and amino-terminated siloxane (SA) as the blocking agent. The chemical structure of PU-SA was characterized by Fourier transform infrared spectroscopy (FT-IR). X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) showed that PUSA had been successfully finished on the surface. Additionally, the thermogravimetric analysis (TGA) demonstrated that the PU-SA treated fabrics showed low decomposition temperature and slightly high char residue. As a finishing agent, the effect of PU-SA on the handle of cotton fabrics was also studied by using a Kawabata Evaluation System for Fabrics (KES-F). The experimental results found that PU-SA had a significant improvement on the bending properties, surface properties, and compressional properties. Moreover, the mechanical and anti-wrinkle properties of the cotton fabrics were also enhanced.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 319
·期 3
·869-880
·
IF 1.181
Ding Hanlin,Luo Xuegang,Zhang Xiaonuo,Yang Hao
In this work, a modified biomass material was successfully prepared by immobilization and inactivation method based on Aspergillus niger , and the obtained environmentally friendly Alginate-immobilized Aspergillus niger microsphere (AAM) exhibited a superior Th(IV) biosorption performance. The sorption kinetics and thermodynamic analysis were studied and showed that the sorption process is spontaneous and endothermic under the experimental conditions. Additionally, the maximum biosorption capacity of AAMs for Th(IV) can be of 303.95 mg g −1 at 313.15 K, which exhibited a superior biosorption capacity than the most reported other biomass materials. The results illustrated the biomaterial had good recyclability through immobilization and inactivation.
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IONICS
·
2018
·Vol. 25
·期 2
·573-581
·
IF 2.347
Zhang Chengyi,Zhang Wen,Mu Yingxin,Fang Feifei,Huang Chengde,Wang Yuxin
In this work, a novel holey graphene oxide bonded with sulfonic acid groups (S-HGO) was developed using a facile and eco-friendly strategy: erosion and oxidation of graphene oxide (GO) by H 2 O 2 and sulfonation by 4-benzenediazoniumsulfonate. The freestanding paper fabricated by S-HGO shows a high proton conductivity of 4.97 × 10 −2 S cm −1 at 60 °C and 100% relative humidity (RH), which is comparable to Nafion 115 (7.67 × 10 −2 S cm −1 ) at the same condition. The holes on S-HGO provide shortcut channels for proton transfer across the GO nanosheet. The chemical-linked sulfonic acid groups afford additional hop sites for proton conduction and endow itself an enhanced thermostability. Under 100% RH and ambient pressure, the freestanding S-HGO deliver a peak power density of 103 mW cm −2 at a load current density of 273 mA cm −2 , which is about three times more than that of GO at 35 °C. The results demonstrate that this S-HGO paper is a promising nanoscale inorganic material for proton exchange membranes.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 2
·423-428
·
IF 1.754
Liu Jian-Ping,Zhang Han-Yu,Wang Jun
We developed a seepage method for fabricating a non-enzymatic glucose sensor based on a hybrid of polypyrrole (PPy), silver amalgam (AgHg) and natural biomineralization hydroxyapatite (BioHAP). The fabricated sensor (PPy/BioHAP/AgHg) with unique structure presents a synergistic effect of the hybrid for glucose sensing. Many active sites on BioHAP help to adsorb glucose molecules. AgHg is used as the source of Ag for electrocatalyzing glucose oxidation. PPy forms a wonderful tubular array in BioHAP, improving its conductivity. The sensitivity and the limit of detection reach 2.21 µA M cm −2 and 0.27 mM for glucose ( S / N = 3), respectively. It also shows a good selectivity to ascorbic acid, uric acid and dopamine.
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