ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 21
·25899-25907
·
IF 2.914
Yao Zongbao,Yang Liu,Song Na,Wang Changhui,Jiang Helong
As a recently discovered process of nitrogen cycling, anaerobic ammonium oxidation coupled to ferric iron reduction (Feammox) has attracted more attentions. This study investigated the spatial variation of Feammox in the sediment of different zones of a shallow freshwater lake and the effect of organic matter derived from algae and macrophyte on Feammox process. The potential Feammox rates showed significant differences among sediments from algae-dominated area (ADA), transitional area in the center of the lake (TDA), and macrophyte-dominated area (MDA), and in a descending order, ADA, MDA, and TDA. The potential Feammox rate ranged from 0.14 to 0.34 mg N kg −1 day −1 in the freshwater lake sediment. The potential Feammox rates of the sediment with algae or macrophyte amendment were 12.29% and 15.31% higher than the control test without algae and macrophyte amendment. The addition of algae or macrophyte to the sediment from TDA could improve the amount of HCl-extractable total Fe, Fe(III) reduction rate, and the abundance of FeRB. These results demonstrated that organic matter is one of the key regulators of Feammox process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-7
·
IF 4.011
Li Zhen,Peng Ying,Xia Xingyu,Cao Zhe,Deng Yuqing,Tang Bin
A Sr-based metal-organic framework (MOF) is introduced as ketoprofen carrier to form a comprehensive system for treating osteoarthritis (OA), and the drug loading amount and release rate is investigated. Structural characterization of the samples showed that Sr/PTA-MOF had good crystal morphology and structure, and chemical and thermal stability. Ketoprofen was successfully loaded on the MOF carrier, which had been identified by high performance liquid chromatography (HPLC) and thermogravimetric analysis (TGA). The release experiment manifested that more than 90% of ketoprofen released from Sr/PTA-MOF after 24 h, and ketoprofen delivery was mainly governed by the Higuchi model. Furthermore, cytotoxicity experiment manifested that synthesized MOF carrier had no poisonous effect on OA chondrocytes, which provided a preliminary foundation for the realization of comprehensive treating OA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 3
·1385-1391
·
IF 3.917
Cao Xinwang,Zhu Mengting,Fan Fangwei,Yang Yinzhi,Zhang Qiang,Chen Yiren,Wang Xin,Deng Zhongmin
In this study, all-cellulose nanocomposites were developed by depositing one-dimensional jute cellulose nanowhiskers on a hydrolyzed two dimensional electrospun nanofibrous membrane via an immersion-drying process. The prepared nanocomposites were characterized by Fourier Transform Infrared, field emission scanning electron microscope, thermal gravimetric analysis, Brunauer, Emmett and Teller specific surface area, and mechanical properties. The versatile all-cellulose nanocomposites have the potential to be used in ultrafiltration, medical application, catalyst supports, etc.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-12
·
IF 5.479
Ge Yu,Qu Mingren,Xu Lanjiao,Wang Xiaoqiang,Xin Junping,Liao Xiaoning,Li Meifa,Li Mingfang,Wen Yangping
A series of phosphorene (BP) nanocomposites was prepared to realize simultaneous electrochemical determination of clenbuterol (CLB) and ractopamine (RAC). CLB and RAC are the most commonly used β-agonists in animal-derived food. The BP nanohybrid was obtained by co-decoration with both mono(6-mercapto-6-deoxy)-β-cyclodextrin and poly(3,4-ethylenedioxythiophene) nanoparticles. It displays high stability, antifouling capability, a large electrochemical active surface and good electrochemical response. The electrochemical assisted antifouling strategy was selected by further eliminating the fouling of the electrode surface using continuous cyclic voltammetry. The electrode was employed for electrochemical sensing of CLB and RAC at typical peak voltages of 0.8 and 1.0 V (vs. SCE). Responses are linear in the 0.3–90 μM concentration range for CLB, and from 0.3 to 9.4 μM for RAC under optimal conditions. The limit of detection are 0.14 and 0.12 μM, respectively. The sensor was employed for simultaneous determination of CLB and RAC in (spiked) beef, feed and bovine serum samples with acceptable recoveries.
An electrochemically assisted anti-fouling method for simultaneous voltammetric nanosensing of clenbuterol (CLB) and ractopamine (RAC) in edible cattle product samples using high-stable and anti-foul phosphorene (BP) co-decorated with mono(6-mercapto-6-deoxy)-β-cyclodextrin (S-β-CD) and poly(3,4-ethylenedioxythiophene) (PEDOTNPs).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-10
·
IF 5.479
Wang Baichun,Liu Bin,Yan Yinghua,Tang Keqi,Ding Chuan-Fan
A binary magnetic metal-organic framework (MOF)-functionalized material (magG@PDA@Ni-MOF@Fe-MOF) was prepared through grafting Ni-MOF and Fe-MOF on magnetic (Fe 3 O 4 ) graphene with polydopamine (PDA) as a middle layer. Compared with single MOFs functionalized materials (magG@PDA@Ni-MOF and magG@PDA@Fe-MOF) under the same conditions, magG@PDA@Ni-MOF@Fe-MOF not only displays lower detection limits (4 fmol) and selectivity (1:1000), but also has better enrichment efficiency for both multi- and monophosphopeptides. Other than this, magG@PDA@Ni-MOF@Fe-MOF exhibits fine reusability (five cycles) and rapid enrichment property (1 min), and 24 phosphopeptides were detected when it was applied to the analysis of human saliva.
The strategy of preparing a binary magnetic metal-organic framework (MOF)-functionalized material (magG@PDA@Ni-MOF@Fe-MOF) through grafting Ni-MOF and Fe-MOF on magnetic graphene with polydopamine (PDA) as a middle layer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36933-36941
·
IF 2.914
Chen Jun,He Jinjia,Wang Xiaoping,Hrynsphan Dzmitry,Wu Jiali,Chen Jianmeng,Yao Jiachao
Conversion of Fe II (EDTA)-NO or Fe III (EDTA) into Fe II (EDTA) is a key process in a wet flue gas denitrification technology with Fe II (EDTA) solution. In this work, the stoichiometry, kinetics, and thermodynamics of Fe II (EDTA)-NO reduction by Mn powder were investigated. We first studied the Fe II (EDTA)-NO reduction and product distribution to speculate a possible stoichiometry of Fe II (EDTA)-NO reduction by Mn powder. Then, the effects of major influencing factors, such as pH value, temperature, and Mn concentration, were studied. The pseudo-second-order model was established to describe the Fe II (EDTA)-NO reduction. Simultaneously, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy ( E a ), enthalpy of activation (∆ H ‡ ), and entropy of activation (∆ S ‡ ) were calculated as 23.68 kJ/mol, 21.148 kJ/mol, and − 149.728 J/(k mol), respectively. Additionally, simultaneous reduction of Fe III (EDTA) and Fe II (EDTA)-NO was investigated to better study the mechanism of Fe II (EDTA) regeneration, suggesting that there was a competition between the two reduction processes. Finally, a simple schematic mechanism of NO absorption by Fe II (EDTA) combined with regeneration of manganese ion and ammonium was proposed. These fundamental researches could offer a valuable guidance for wet flue gas denitrification technology with Fe II (EDTA) solution.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 10
·1-13
·
IF 2.009
Liu Yanan,Yin Han,Xu Chengcheng,Zhuge Xingchen,Wan Jun
The organic dye pollutants are of more concern due to their toxic effects on human health, animals, and plants, and researchers thus should pay more attention to their removal. The nanocomposite photocatalysts of polythiophene-tungsten selenide/nitride-doped graphene oxide (PTh-WSe 2 /NG) were synthesized by a facile hydrothermal method. The catalytic activity of the nanocomposite was detected by degradation methylene blue (MB) under visible light. The as-prepared nanocomposite was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The results showed that the photocatalytic performance of the composites was better than those of WSe 2 and PTh. This was mainly due to the PTh-WSe 2 /NG which contains excellent conductivity and charge separation characteristics of PTh, WSe 2 , and NG. They effectively inhibit the recombination of electron-hole pairs of PTh-WSe 2 /NG. 12.5 wt% PTh-WSe 2 /NG (12.5 wt% of PTh) was the most efficient catalyst, with the removal rate reaching to 94.8% of 1.0 × 10 –4 mol/L MB within 60 min of visible light irradiation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 5
·1221-1226
·
IF 1.913
Yan Liqiang,Xie Ya,Li Jianping
Development of optical probe for the detections of Fe 3+ and Cu 2+ is one of the most active and interesting research directions in analytical chemistry because of their vital roles in the environment protection and human health. Herein, a turn on optical rhodamine B-based probe (probe 1) with the significant changes in color and fluorescence has been prepared. The color of this probe solution changed from colorless to amaranth in the presence of Fe 3+ and to pink in the presence of Cu 2+ , which is promising for the qualitative recognition of Fe 3+ and Cu 2+ . More importantly, probe 1 could be used for the quantitative analysis of Fe 3+ and Cu 2+ by fluorescence enhancement. The detection limits for Fe 3+ and Cu 2+ reached 8.1 × 10 −8 M and 4.8 × 10 −7 M, respectively. Furthermore, it was found that this probe can also be used for fluorescence imaging of Fe 3+ and Cu 2+ in living cells.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 3
·837-848
·
IF 2.372
Lu Jiqing,Liu Xing,Yu Guanqun,Lv Jinkun,Rong Zeming,Wang Mei,Wang Yue
Abstract Cyclohexanol is an important feedstock in the chemical industry and the selective hydrodeoxygenation of lignin-derived guaiacol to cyclohexanol have gained increasing research attention in recent years. In this work, a series of nanoporous metal catalysts were employed for the hydrodeoxygenation of guaiacol and nanoporous Ni (NP-Ni) exhibited high catalytic performance for the preparation of cyclohexanol. With water as solvent, 100% conversion of guaiacol and over 90% selectivity to cyclohexanol were achieved at 180 °C and 2 MPa for 4 h. In order to further promote the stability of NP-Ni, induction melting, vacuum arc melting and mechanical alloying were separately employed for the preparation of NiAl precursor alloy. Mechanical alloying seemed to be an effective method for the alloying process and the as-prepared NP-Ni could keep almost stable after 10 times recycling. Furthermore, the reaction mechanism was investigated with NP-Ni for guaiacol hydrodeoxygenation. Scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron micrographs (TEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were employed for the characterization of NiAl alloy and the optimal preparation methods of NP-Ni were acquired according to the characterization results. Graphic Abstract
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2020
·Vol. 11
·期 4
·1245-1253
·
IF 2.602
Yin Yi-Rui,Sang Peng,Xiao Min,Xian Wen-Dong,Dong Zhou-Yan,Liu Lan,Yang Li-Quan,Li Wen-Jun
A β-glucosidase obtained from Thermobifida halotolerans YIM 90462 T was expressed in Escherichia coli BL21 and subsequently characterized. The recombinant enzyme ThBGL1A showed optimal activity at 45 °C and pH 6, but also showed high activity from 40 to 55 °C and pH 5.6–6.6. Its half-life activity was 58 min at 50 °C. ThBGL1A exhibited notable cold-adapted activity, retaining 13.1%, 49.4%, and 83.5% of its optimal activity at 5, 25, and 30 °C, respectively. Kinetic characterization revealed an enzymatic turnover (Kcat) of 30 s −1 (cellobiose), 41.8 s −1 (p-nitrophenyl-β- d -glucopyranoside), and 52.6 s −1 (p-nitrophenyl-β- d -galactopyranoside). Moreover, ThBGL1A had high tolerance for salt, xylose, and glucose, which are extremely desirable features for industrial applications. Interestingly, its Ki for glucose was 932 mM and more than 80% of its optimal activity in the presence of 2000 mM xylose. After the addition of ThBGL1A (0.05 mg/ml) to a commercial cellulase reaction system, glucose yields from sugarcane bagasse were increased 20% and 18% after 1 day at 30 °C and 45 °C, respectively. Overall, this work identifies a cold-adapted, salt- and glucose-tolerant β-glucosidase with potential applications in commercial cellulose utilization and the bioenergy industry.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 140
·期 4
·1759-1767
·
IF 2.471
Zhang Jiankan,Zhao Fengqi,Yang Yanjing,Yan Qilong,Zhang Ming,Ma Wenzhe
Fe 3 O 4 /reduced graphene oxide (Fe 3 O 4 /rGO) nanocomposite has been successfully fabricated using a modified interface solvothermal method and characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. In the preparation procedure, graphene oxide was reduced and ultrafine Fe 3 O 4 nanoparticles (NPs) were uniformly loaded on reduced graphene oxide (rGO) carrier. Scanning electron microscope, transmission electron microscope images and Brunauer–Emmett–Teller specific surface area revealed that the aggregation of Fe 3 O 4 NPs was greatly reduced by introducing rGO as a substrate. The average size of the Fe 3 O 4 NPs anchored on the graphene sheets was 100 nm, which is much smaller than 1-μm bare Fe 3 O 4 . The DSC results showed that Fe 3 O 4 /rGO nanocomposite reduces the first decomposition temperature of dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) by 44.9 °C and decreases the apparent activation energy of TKX-50 by 26.2 kJ mol −1 , which exhibits higher catalytic performance than its individual components and their physical mixture (hybrid). Hence, Fe 3 O 4 /rGO nanocomposite can be a promising additive for insensitive solid propellants based on TKX-50.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 1
·1-12
·
IF 2.132
Hou Junjie,Zhou Xuemei,Yang Zhi,Nie Huagui
Oxygen evolution reaction (OER) catalysts are of central importance for electrocatalytic water oxidation and fuel generation, while it is still an urgent requirement to design and develop efficient OER catalysts with rapid kinetics and low overpotentials. Herein, we report an electrochemical deposition method to fabricate carbon nanotubes/N-doped cuprous sulfide (CNTs/N-Cu 2 S) composites using thiourea and a CuSO 4 solution as the S and Cu sources, respectively. The advantages of this strategy include low cost, simple processing and the absence of templates or surfactants that can otherwise affect the electrochemical properties of the products. The N supplied by the thiourea can be used as a doping agent as a result of the in situ formation of small N-Cu 2 S particles, which can increase larger surface area and create more active sites to enhance OER catalytic activity, compared with that obtained with materials synthesized without adding the thiourea. The synergic interface of CNTs and N-Cu 2 S can improve conductivity and efficient chemical transfer in the composites electrodes by introducing CNTs. Under the optimal experimental conditions, the CNTs/N-Cu 2 S-5cyc composites present an excellent activity with the current density of 10 mA cm −2 at a low OER overpotential of 280 mV, the Tafel slope of 63 mV dec −1 and a strong electrochemical stability in 1.0 M KOH solution.
Graphical abstract
✓ 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）