COMPOSITES COMMUNICATIONS
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2017
·
IF 0
Ying Bai,Xue Mao,Jun Song,Xia Yin,Jianyong Yu,Bin Ding
Study of high-efficiency and free secondary pollution TiO 2 based photocatalyst has become the one of the most urgent problems in improving the decolorization effect of the waste water from printing and dyeing mill. In this work, a novel self-standing Ag 2 O@YSZ-TiO 2 p-n nanoheterojunction nanofibrous membrane was designed for ultraviolet (UV) photocatalyst by a facile combination of electrospinning technique and precipitation process. Moreover, the UV photocatalytic performance of the flexible AZT p-n nanoheterojuction nanofibrous membranes with a band gap energy of 2.89 eV and good reversibility of 5 cycles, was superior to the commercial catalyst P25 for photocatalytic degradation of methylene blue. Furthermore, the photocatalytic mechanism of the flexible Ag 2 O@YSZ-TiO 2 nanofibrous photocatalyst was proposed by the electron transition in Ag 2 O/TiO 2 p-n nanoheterojunction, which showed a new insight to development of flexible and high-efficiency nanoheterojunction nanocrystalline photocatalytic membranes.
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Molecular Catalysis
·
2017
·
IF 0
Junlei Zhang,Zhen Ma
Ag 3 VO 4 /BiOBr n-p heterojunctions were prepared via chemical deposition. Ag 3 VO 4 /BiOBr consists of Ag 3 VO 4 nanoparticles with sizes ranging from several to tens nanometers and flower-like BiOBr microspheres composed of irregular nanosheets. The photocatalytic performance of Ag 3 VO 4 /BiOBr and relevant samples was investigated in the visible-light-driven degradation of Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC). Ag 3 VO 4 /BiOBr heterojunction with a BiOBr/Ag 3 VO 4 mass ratio of 10% was more active than a physical mixture of Ag 3 VO 4 and BiOBr, showing the importance of forming the heterojunction. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were found to be the primary active species. A possible mechanism for the enhanced photocatalytic performance was proposed.
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INTERNATIONAL JOURNAL OF MINERAL PROCESSING
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2017
·
IF 1.561
Cheng Zhang,Cheng Liu,Qiming Feng,Yanfei Chen
Utilization of N -carboxymethyl chitosan (N-CMCh) to limit the detrimental effect of serpentine on the flotation of pyrite is presented in this work. Flotation results show that the presence of hydrophilic serpentine slimes results in lower recoveries of the valuable pyrite. Utilization of N -carboxymethyl chitosan can limit the detrimental effect of serpentine on the flotation of pyrite. Zeta potential measurements illustrate that N-CMCh is with negative charge and the electrostatic interaction between serpentine and N-CMCh is occurred at pH 8.5, then the serpentine zeta potential will be changed from positive to negative, the electro-steric attraction converts into electro-steric repulsion between pyrite and serpentine and the pyrite recovery is improved.
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高影响因子
CARBON
·
2016
·
IF 6.198
Jingyue Zhu,Dan Xu,Cancan Wang,Wenjing Qian,Jun Guo,Feng Yan
This work reports a facile strategy for the preparation of Nitrogen-doped porous carbons via carbonization of a mixture containing ferric citrate (FC) and ammonium chloride (NH 4 Cl). FC provides carbon and iron element sources, while ammonium chloride acts as both the porogen and nitrogen dopant during the carbonization process . The formed hierarchical porous structures facilitate the ion diffusion/transport, and nitrogen-doping provides more active sites, which contribute to both oxygen reduction reaction (ORR) and supercapacitor applications. Compared with KOH and NaCl, the utilization of NH 4 Cl as porogen shows the best ORR performance in this work might due to the dual functions of NH 4 Cl. Ferric citrate-NH 4 Cl carbonized at 700 °C exhibits good capacity of 242 F g −1 and stability in 6 M KOH at a current density of 1 A g −1 . Since both FC and NH 4 Cl are cheap and easily available, this work provides a facile and effective method to obtain carbons with superb electrochemical performances.
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高影响因子
LANGMUIR
·
2016
·
IF 3.993
Defeng Li,Ang Wu,Guangyin Xu,Hua Lai,Zhongjun Cheng,Yuyan Liu
In this paper, we report a simple method based on assembling n-alkanoic acids on hierarchical structured copper toward preparing surfaces with tunable oil wetting performance in water. Surface wettability from superoleophobicity to superoleophilicity in water can be regulated through tuning the chain length of n-alkanoic acids. Importantly, even in strongly acid and basic water, such phenomena can still be observed. The cooperation between the hierarchical structures and the surface chemical composition variation is responsible for the controllability. Meanwhile, the tunable ability is universal and the controllability is suitable for various oils including silicon oil, n-hexane, and chloroform. Moreover, the method was also used on copper mesh substrates, and we reported the related application of selective oil/water separation. This paper provides a flexible strategy toward preparing surfaces with tunable oil wetting performances, which can also be suitable for other materials, and offers some fresh ideas in manipulating underwater oil wetting performances on surfaces.
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2017
·
IF 4.9
Nai-Xian Feng,Jiao Yu,Ce-Hui Mo,Hai-Ming Zhao,Yan-Wen Li,Bing-Xiao Wu,Quan-Ying Cai,Hui Li,Dong-Mei Zhou,Ming-Hung Wong
Phthalic acid esters (PAEs) are a group of recalcitrant and hazardous organic compounds that pose a great threat to both ecosystem and human beings. A novel endophytic strain YJB3 that could utilize a wide range of PAEs as the sole carbon and energy sources for cell growth was isolated from Canna indica root tissue. It was identified as Bacillus megaterium based on morphological characteristics and 16S rDNA sequence homology analysis. The degradation capability of the strain YJB3 was investigated by incubation in mineral salt medium containing di-n-butyl-phthalate (DBP), one of important PAEs under different environmental conditions, showing 82.5% of the DBP removal in 5 days of incubation under the optimum conditions (acetate 1.2 g·L − 1 , inocula 1.8%, and temperature 34.2 °C) achieved by two-step sequential optimization technologies. The DBP metabolites including mono-butyl phthalate (MBP), phthalic acid (PA), protocatechuic acid (PCA), etc. were determined by GC–MS. The PCA catabolic genes responsible for the aromatic ring cleavage of PCA in the strain YJB3 were excavated by whole-genome sequencing. Thus, a degradation pathway of DBP by the strain YJB3 was proposed that MBP was formed, followed by PA, and then the intermediates were further utilized till complete degradation. To our knowledge, this is the first study to show the biodegradation of PAEs using endophyte. The results in the present study suggest that the strain YJB3 is greatly promising to act as a competent inoculum in removal of PAEs in both soils and crops.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Yi Wang,Hanyu Liu,Kun Wang,Shuqin Song,Panagiotis Tsiakaras
In the present work, a novel metal-free ORR electrocatalyst, with large specific surface area (2600 m 2 g −1 ), high content of N dopants (3.12 at.%) and 3D cross-linking hierarchically porous structure (abbreviated as LHNHPC) is readily prepared by using a modified classical carbon-aerogel method with NH 3 as the activating agent. Compared with benchmark Pt/C catalyst, it is found that, LHNHPC exhibits similar electrocatalytic activity towards oxygen reduction reaction (ORR), superior durability and excellent methanol tolerance in basic media. The above electrochemical properties of LHNHPC are mainly attributed to the synergistic contribution of its unique hierarchical pore structure, the rich N doping and the large surface area. It can be anticipated that the proposed two-step process could be used for mass production of metal free electrocatalysts for a wide range of electrochemical devices including fuel cells and metal-air batteries.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 89
·85735-85744
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IF 3.289
Bin Cai,Qin Zou,Yi Zuo,Limei Li,Boyuan Yang,Yubao Li
Composite microspheres based on nano-hydroxyapatite (n-HA)/chitosan (CS) with different weight ratios were fabricated by an emulsion method and using natural vanillin as a cross-linking agent. FT-IR, XRD, TGA, SEM and laser particle size analysis were used to characterize their physico-chemical properties. Live-dead cell staining and MTT assay were used to evaluate cell viability and cytocompatibility. The results showed that the rod-like n-HA crystals could be incorporated into the CS matrix in a relatively high level up to 29.57 wt%. The encapsulation efficiency of n-HA in the composite microspheres was between 29.50–73.93%. The composite microspheres with a diameter of 10.9–55.0 μm and good swelling properties should be easy to inject into irregular bone defects. The studies of in vitro biodegradation and cell culture using MG63 cells demonstrated that the vanillin-crosslinked n-HA/CS microspheres could be degraded in a sustained and controlled behavior while supporting cell growth, thus acting as worthy candidates for a multifunctional injectable matrix in bone tissue engineering.
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高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2016
·Vol. 95
·期 2
·364-371
·
IF 1.066
Wenling Hu,Xiaolong Han,Liangliang Liu,Xin Zhang,Juanqin Xue,Baoyi Wang,Peng Zhang,Xingzhong Cao
Polyethylene glycol (PEG) of three different molecular weights was used to prepare PEG/PVDF composite membranes for separating organosulphur compounds from n -heptane by pervaporation. All the composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and positron annihilation spectroscopy (PAS). The effects of operating temperature, feed sulphur content, and organosulphur species on performance of PEG/PVDF composite membranes with different molecular weights were investigated. When the feed organosulphur was thiophene, the fluxes decreased with an increase in PEG molecular weight, however, the enrichment factors were in a different order: PEG membrane with molecular weight of 35 000 exhibited the highest enrichment factor of 12.59 for thiophene at 85 °C. When the feed organosulphur was 2-methylthiophene or 2,5-dimethylthiophene, it was found that the PEG membrane with molecular weight of 100 000 showed the highest enrichment factor. The results showed that PEG molecular weight has a considerable effect on separation performance for pervaporation desulphurization.
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高影响因子
Catalysts
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2017
·Vol. 7
·期 7
·200
·
IF 3.082
Hui Dai,Mingyuan Zhu,Haiyang Zhang,Feng Yu,Chao Wang,Bin Dai
Recently, many scientists have focused on the development of green industrial technology. However, the process of synthesizing vinyl chloride faces the problem of Hg pollution. Via a novel approach, we used two elements Mo and Ti to prepare an inexpensive and green binary transition metal nitride (BTMN) as the active ingredient in a catalyst with nano-sized particles and an excellent degree of activation, which was supported on activated carbon. When the Mo/Ti mole ratio was 3:1, the conversion of acetylene reached 89% and the selectivity exceeded 98.5%. The doping of Ti in Mo-based catalysts reduced the capacity of adsorption for acetylene and also increased the adsorption of hydrogen chloride. Most importantly, the performance of the BTMN excelled those of the individual transition metal nitrides, due to the synergistic activity between Mo and Ti. This will expand the new epoch of the employment of transition metal nitrides as catalysts in the hydrochlorination of acetylene reaction.Keywords:binary transition metal nitride;acetylene hydrochlorination
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高影响因子
Small
·
2016
·Vol. 13
·期 3
·1602507
·
IF 8.315
Feng Hu,Hongchao Yang,Changhong Wang,Yejun Zhang,Huan Lu,Qiangbin Wang
Rational design of cost-effective, nonprecious metal-based catalysts with desirable oxygen reduction reaction (ORR) performance is extremely important for future fuel cell commercialization, etc. Herein, a new type of ORR catalyst of Co-N-doped mesoporous carbon hollow sphere (Co-N-mC) was developed by pyrolysis from elaborately fabricated polystyrene@polydopamine-Co precursors. The obtained catalysts with active Co sites distributed in highly graphitized mesoporous N-doped carbon hollow spheres exhibited outstanding ORR activity with an onset potential of 0.940 V, a half-wave potential of 0.851 V, and a small Tafel slope of 45 mV decade −1 in 0.1 m KOH solution, which was comparable to that of the Pt/C catalyst (20%, Alfa). More importantly, they showed superior durability with little current decline (less than 4%) in the chronoamperometric evaluation over 60 000 s. These features make the Co-N-mC one of the best nonprecious-metal catalysts to date for ORR in alkaline condition.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zhiwei Zhang,Hanning Li,Jie Hu,Baozhong Liu,Qingrui Zhang,Carlos Fernandez,Qiuming Peng
A novel nitrogen-doped biomass carbon/silver (C-N/Ag) composite has been synthesized by a simple method, wherein the precursor of soymilk simultaneously serves as carbon and nitrogen sources, reductant and substrate. The structure, morphology and valence state of samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectra. Results show the formation of nano-sized Ag homogenously disperses on the surface of mesoporous substrate, and the self-reduction role mainly attributes to the presence of unsaturated carbon bonding. Electrochemical properties were characterized by galvanostatic discharge and impedance spectra techniques. The sample prepared with 1 mmol AgNO 3 solution, activated by 0.1 M KOH and annealed at 900 °C shows excellent oxygen reduction reaction activity and good electrochemical durability in alkaline medium. The onset potential, limiting diffusion current density and electron transfer number are 0.93 V, 6.26 mA cm −2 and 4.00, respectively, superior to those of 60 wt.% Ag/C and comparable to 20 wt.% Pt/C catalysts correspondingly. The discharge performance of Zn-air batteries is better than that of 20 wt% Pt/C.
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高影响因子
危险品化学品经营许可证（带存储）