JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2016
·Vol. 46
·期 10
·1059-1065
·
IF 2.223
Lu Haiting,Zhang Yan,Liu Peifang
Abstract Mn 2 O 3 microcubes with three-dimensional (3D) micromesoporous network structure were synthesized by thermal decomposition of the as-prepared MnCO 3 precursor. The structure, morphology, and textural property of the as-synthesized Mn 2 O 3 microcubes were characterized. The electrochemical property and electrochemical sensing performance toward nitrite detection were investigated. Owing to the unique 3D micromesoporous network structure, the Mn 2 O 3 microcubes could provide electrochemical sensing of nitrite with high sensitivity, selectivity, and reliability. Graphical Abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 8
·2478-2485
·
IF 1.408
Zhou Lihua,Niu Yu,Yang Jinbei,Li Chenggang,Guo Xiaoting,Li Ling,Qiu Ting
Sulfated titania (SO
2− 4
/TiO 2 ) was prepared and characterized by nitrogen adsorption-desorption, FT-IR, thermostability analyzer, XRD and particle size analyzer. The esterification of myristic acid (MA) with isopropanol (IPOH) catalyzed by the solid super acid SO
2− 4
/TiO 2 was studied. The effect of reaction kinetics conditions such as temperature, stirrer speed, initial mole ratio of alcohol to acid, and catalyst loading on the conversion of myristic acid was investigated. A second-order pseudo-homogeneous model was developed to calculate the rate of the reaction, and then the kinetic parameters were estimated. The calculated values were in agreement with experimental data.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 1
·244-250
·
IF 2.019
Du Liting,Li Yu,Li Shouchun,Li Haiying,Liu Li,Cheng Yali,Duan Haojie
The hierarchical porous and nonporous SnO 2 microflowers was successfully synthesized by a simple hydrothermal method and followed by calcination procedure. The microstructure and morphology of the product were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, and scanning electron microscopy (SEM). The SEM images display that the prepared SnO 2 is a microflower composed of countless thin sheets, and each of the sheets covered in a series of porous by calcining at 500 °C. Nevertheless, there is no porous when it treated at 400 °C. The results of comparison show that the hierarchical porous SnO 2 microflowers (HPSM) sensors possess a preferable gas-sensing property. The response of HPSM sensors to 100 ppm ethanol is 205.6 at the optimum operating temperature 240 °C. Which sensitivity is almost 3.9 higher than the hierarchical nonporous SnO 2 microflowers (HNSM) (52.9). Meanwhile, the response and recovery times of HPSM (HNSM) are 3 s (3 s) and 45 s (145 s) to 100 ppm ethanol, respectively. What’s more, the minimum concentration of ethanol that we can detect is 0.1 (1.0) ppm, and the response value is 1.9 (2.0). At last, both HPSM and HNSM own a good selectivity.
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BIODEGRADATION
·
2017
·Vol. 29
·期 1
·1-10
·
IF 2.018
Wang Hui,Hu Jinxing,Xu Kai,Tang Xianjin,Xu Xinhua,Shen Chaofeng
Two biphenyl-degrading bacterial strains, SS1 and SS2, were isolated from polychlorinated biphenyl (PCB)-contaminated soil. They were identified as Rhodococcus ruber and Rhodococcus pyridinivorans based on the 16S rRNA gene sequence, as well as morphological, physiological and biochemical characteristics. SS1 and SS2 exhibited tolerance to 2000 and 3000 mg/L of biphenyl. And they could degrade 83.2 and 71.5% of 1300 mg/L biphenyl within 84 h, respectively. In the case of low-chlorinated PCB congeners, benzoate and 3-chlorobenzoate, the degradation activities of SS1 and SS2 were also significant. In addition, these two strains exhibited chemotactic response toward TCA-cycle intermediates, benzoate, biphenyl and 2-chlorobenzoate. This study indicated that, like the flagellated bacteria, non-flagellated Rhodococcus spp. might actively seek substrates through the process of chemotaxis once the substrates are depleted in their surroundings. Together, these data provide supporting evidence that SS1 and SS2 might be good candidates for restoring biphenyl/PCB-polluted environments.
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PubMed
高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 12
·5565-5577
·
IF 3.417
Cao Jie,Fei Dongtao,Tian Xiaoling,Zhu Yuejun,Wang Shanshan,Zhang Yadong,Mao Qiangqiang,Sun Mingbo
A novel porous adsorbent with high surface area and rigid structure was prepared by crosslinking oxidized microcrystalline cellulose particles with tetrafluoroterephthalonitrile. N 2 adsorption–desorption measurements revealed the surface area to be 88.32 m 2 g −1 for the porous adsorbent, while it was only 25.74 m 2 g −1 for the sample crosslinked using epichlorohydrin. This porous adsorbent showed excellent performance for fast and efficient removal of low-concentration heavy metals from aqueous solution. Adsorption kinetic study demonstrated that, within 5 min, the removal efficiency for Pb 2+ , Cu 2+ , and Cd 2+ with initial concentration of 10 mg L −1 by this adsorbent was 93.2, 87.5, and 72.3 %, respectively. Moreover, the pseudo-second-order model correlated better to the adsorption kinetic data than the pseudo-first-order model. The effects of other factors, e.g., initial solution pH, adsorption temperature, initial metal concentration, and background electrolytes, on the removal efficiency were also analyzed. Additionally, desorption experiments indicated that this adsorbent could be effectively regenerated using dilute HCl solution.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3399-3404
·
IF 4.58
Song Hu,Wang Yunhan,Wang Guanquan,Wei Hongyuan,Luo Shunzhong
The authors report on a chromogenic system based MnO 2 nanosheet and the chomgenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB). The MnO 2 nanosheet can oxidize TMB in acidic environment to form a yellow solution with an absorption peak at 450 nm. The process does not require the presence of an enzyme or H 2 O 2 . However, on addition of ferrous ion to the chromogenic system, the MnO 2 nanosheet is decomposed via the redox reaction that occurs between Fe(II) and MnO 2 . As a result, the intensity of the absorption at 450 nm is reduced. This finding is exploited in a photometric method for determination of Fe(II) that shows high selectivity and a 0.3 μM detection limit (based on the 3σ/slope criterion). Fe(II) can also be detected visually in concentrations down to 100 μM. The method was applied to the determination of Fe(II) in spiked water samples and gave satisfactory recoveries.
Schematic illustration of the chromogenic system composed of MnO 2 nanosheets and 3,3′,5,5′-tetramethylbenzidine (TMB) for highly sensitive colorimetric detection of ferrous ion (Fe 2+ )
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Journal of the Iranian Chemical Society
·
2017
·Vol. 14
·期 10
·2087-2096
·
IF 1.407
Zhi Kangkang,Zhang Min,Yang Xin,Zhao Haitian,Dong Aijun,Zhang Hua,Wang Jing
In this paper, a kind of surface molecular imprinting polymers in hydrous solution, with glucose selectively recognition, was successfully synthesized by surface molecular imprinting method, using glucose (Glu) as template molecule, acrylamide as functional monomers, N,N ′-methylenebisacrylamide as the cross-linking agent, ammonium peroxydisulfate as the initiator, activated silica gel (SiO 2 @NH 2 ) as support particles. The influences of cross-linker, initiator as well as support particles amount on the adsorption capacity of Glu-MIPs were performed by single-factor experiments. The optimum conditions were 100 mg of cross-linker, 25 mg of initiator and 1 g of SiO 2 @NH 2 . The adsorption and thermodynamics research revealed that the adsorption of MIPs was fitted to Langmuir, maximum imprinting factor of 2.49 and maximum absorption capacity of 50.06 mg/g. Furthermore, a procedure of extraction of glucose from real fruits samples using the Glu-MIPs as solid-phase extraction adsorbent was developed to apply in analytical techniques.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 18
·10800-10813
·
IF 2.599
Sun Na,Xiao Zhenggang
TiO 2 and Si 3 N 4 nanoparticles (nano-TiO 2 /Si 3 N 4 ) were applied to enhance the thermostability of silicone oil microcapsules based on polystyrene shell using a Pickering emulsion method. The emulsion droplets consisting of silicone oil, monomers and initiator were first stabilized in an aqueous medium containing TiO 2 and Si 3 N 4 nanoparticles as surfactants. The obtained emulsion was subsequently heated and polymerized to form the silicone oil composite microcapsules embedded with nano-TiO 2 /Si 3 N 4 in the polystyrene shell. Various techniques were used to characterize the as-prepared composites so as to investigate the effect of nanoparticles loading and silicone oil content on their chemical composition, morphology and thermal performance. Results showed that the composite silicone oil microcapsules present a well-defined spherical structure with a mean size of 10–20 μm. Compared with pure silicone oil, the thermostability of the microencapsulated silicone oil is significantly enhanced at a low content of nano-TiO 2 /Si 3 N 4 . In particular, these microcapsules showed a considerable increase for initial decomposition temperature and maximum decomposition temperature. Such a notable increment is attributed to the existence of compact PS/TiO 2 /Si 3 N 4 hybrid shell on the silicone oil droplets surface giving silicone oil core a protective effect.
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高影响因子
POLYMER BULLETIN
·
2016
·Vol. 73
·期 8
·2373-2390
·
IF 1.371
Zhu Jinli,Lu Minlei,Wang Miao,Ding Jinjin,Sun Tongming,Tang Yanfeng,Zhang Yuejun
A novel glucose-containing ABC block terpolymer, poly( N -isopropyl acrylamide)-block-poly(acryloyl glucofuranose)-block-poly(acrylic acid) (PNAA) was synthesized by sequential reversible addition–fragmentation chain transfer polymerization. 2 -Dodecylsulfanylthiocarbonylsulfanyl-2-methylpropionic acid was synthesized and was used as a chain transfer agent. The structures were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance and gel permeation chromatography. Transmission electron microscopy and the phase transition behaviour confirmed that the block terpolymers could directly aggregate into spherical micelles. The results of dynamic light scattering and in vitro drug release experiments demonstrated that the content of the poly(3-O-acryloyl-glucofuranose) segments significantly influences the size of the micelles, the critical micelle concentration (CMC) and the drug release behaviours of the PNAA hydrogels. When the monomer molar ratios of acrylic acid/3-O-acryloyl-glucofuranose/ N -isopropyl acrylamide are 4:2:14, the micelle size of PNAA is 292.3 nm, the CMC is the lowest (0.056 mg/mL), and the amount of cumulative drug release is up to 81 %. In vivo biocompatibility tests and in vitro cytotoxicity tests showed that the synthesized block terpolymer had no apparent cytotoxicity.
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Food Analytical Methods
·
2016
·Vol. 10
·期 1
·111-117
·
IF 2.167
Liu Qi,Wang Li,Hu Jie,Miao Yanni,Wu Zixue,Li Jianrong
A rapid and sensitive analytical method for the determination of main organic acids in wines was developed by capillary electrophoresis (CE) with indirect UV detection. Separation parameters including the pH of electrolyte, chromophore, and its concentration were optimized. The results showed that the optimal electrolyte for the separation of organic acids consisted of 10 mmol L −1 2, 4-dihydroxybenzoic acid (DHBA) at pH 3.6 containing 0.4 mmol L −1 cetyltrimethlammonium bromide (CTAB). DHBA as chromphore was selected based on the close mobility to the analyte and relatively large molar extinction coefficient. The method showed good linearity with limits of detection (LOD), ranging from 0.5 to 7.5 mg L −1 . The relative standard deviation (RSD) of interday precisions for the peak area and the migration time were less than 7.2 and 0.8 %, respectively. The recoveries of the analyte in Chinese rice wine sample were between 90.3 and 106.9 % with RSD ranging from 1.4 to 8.9 %. The method was successfully applied to the commercial rice wine and beer samples with dilution and filtration.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 17
·8116-8130
·
IF 2.302
Huang Qiang,Liu Meiying,Chen Junyu,Wang Ke,Xu Dazhuang,Deng Fengjie,Huang Hongye,Zhang Xiaoyong,Wei Yen
Adsorption is an effective and commonly adopted method for removal of organic pollutants from environment. In this work, we described the synthesis and the adsorption behavior of poly(sodium p-styrenesulfonate hydrate) (PSPSH)-modified kaolin, which was obtained by combination of mussel-inspired chemistry and Michael addition reaction. The amino-terminated PSPSH was synthesized by free radical polymerization using cysteamine hydrochloride as the chain transfer agent and sodium p-styrenesulfonate hydrate as the monomer. Raw kaolin and PSPSH-modified kaolin were characterized using several techniques including transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy in detail. The adsorption of methylene blue onto modified kaolin from aqueous solution was investigated, in which the effects of contact time, temperature, solution pH, and initial methylene blue concentration were studied. The experiment data were analyzed using two common adsorption models: Langmuir and Freundlich isotherm models. The kinetic adsorption data were analyzed using pseudo-first-order, pseudo-second-order, and intraparticle diffusion model. The values of thermodynamics constants such as entropy change (Δ S
0 ), enthalpy change (Δ H
0 ) and Gibbs free energy (Δ G
0 ) were also determined. The modified kaolin showed favorable dispersibility and convenient separation, high efficiency, and good regeneration capability in the removal of methylene blue from solution.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 8
·1281-1287
·
IF 1.89
Wan Caichao,Jiao Yue,Li Jian
Cellulose aerogels with porous three-dimensional network structure often suffer from weak mechanical strength, which imposes huge restrictions on their applications. In this work, an easily-operated pre-gelation treatment was introduced to the conventional fabrication technique of regenerated cellulose aerogels (i.e., dissolution, regeneration, and drying treatment) to improve their structure uniformity, crystallinity, and mechanical strength. These properties were found to be closely related to the pre-gelation temperature, and a relatively lower temperature (50 °C) makes the greatest contribution. Especially for the mechanical strength, the elasticity modulus and energy absorption of the aerogels treated at 50 °C reach the maximums of 1.03 MPa and 476.2 kJ m −3 , which are 5.4 times and 94.3 % higher than those of the untreated aerogels. As an example of potential application, the surface of the aerogels was decorated with multiwalled carbon nanotubes. The obtained composite displays a good electromagnetic interference shielding ability.
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高影响因子
危险品化学品经营许可证（带存储）